; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -loop-idiom -mtriple=x86_64 -mcpu=core-avx2 < %s -S | FileCheck %s

declare void @escape_inner(i8, i8, i8, i1, i8)
declare void @escape_outer(i8, i8, i8, i1, i8)

declare i8 @gen.i8()

; Most basic pattern; Note that iff the shift amount is offset, said offsetting
; must not cause an overflow, but `add nsw` is fine.
define i8 @p0(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @p0(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i8 @llvm.ctlz.i8(i8 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i8 8, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[TMP0:%.*]] = sub i8 0, [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i8 [[VAL_NUMACTIVEBITS]], [[TMP0]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i8 @llvm.smax.i8(i8 [[VAL_NUMACTIVEBITS_OFFSET]], i8 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i8 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i8 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i8 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i8 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i8 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; `add nuw` is also fine.
define i8 @p1(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @p1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i8 @llvm.ctlz.i8(i8 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i8 8, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[TMP0:%.*]] = sub i8 0, [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i8 [[VAL_NUMACTIVEBITS]], [[TMP0]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i8 @llvm.smax.i8(i8 [[VAL_NUMACTIVEBITS_OFFSET]], i8 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i8 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i8 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i8 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i8 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i8 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = add nuw i8 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nuw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; `sub nsw` is also fine.
define i8 @p2(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @p2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i8 @llvm.ctlz.i8(i8 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i8 8, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i8 [[VAL_NUMACTIVEBITS]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i8 @llvm.smax.i8(i8 [[VAL_NUMACTIVEBITS_OFFSET]], i8 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i8 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i8 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i8 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i8 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i8 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = sub nsw i8 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = sub nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; But `sub nuw` is not fine..
define i8 @n3(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n3(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS:%.*]] = sub nuw i8 [[IV]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = sub nuw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; Likewise, plain `sub` is not fine.
define i8 @n4(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n4(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS:%.*]] = sub i8 [[IV]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = sub i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; Likewise, plain `add` is not fine.
define i8 @n5(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n5(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS:%.*]] = add i8 [[IV]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; Of course, we don't have to have an offset
define i8 @p6(i8 %val, i8 %start) mustprogress {
; CHECK-LABEL: @p6(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i8 @llvm.ctlz.i8(i8 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i8 8, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nuw nsw i8 [[VAL_NUMACTIVEBITS]], 0
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i8 @llvm.smax.i8(i8 [[VAL_NUMACTIVEBITS_OFFSET]], i8 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i8 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i8 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i8 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i8 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i8 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL]], [[IV]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[IV]], i8 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[IV_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %val.shifted = ashr i8 %val, %iv
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %iv, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %iv.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

declare void @escape_inner.i7(i7, i7, i7, i1, i7)
declare void @escape_outer.i7(i7, i7, i7, i1, i7)

; Other bitwidths are fine also
define i7 @p7(i7 %val, i7 %start, i7 %extraoffset) mustprogress {
; CHECK-LABEL: @p7(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i7 @llvm.ctlz.i7(i7 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i7 7, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[TMP0:%.*]] = sub i7 0, [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i7 [[VAL_NUMACTIVEBITS]], [[TMP0]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i7 @llvm.smax.i7(i7 [[VAL_NUMACTIVEBITS_OFFSET]], i7 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i7 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i7 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i7 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i7 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i7 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i7 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i7 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i7 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i7 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner.i7(i7 [[IV]], i7 [[NBITS]], i7 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i7 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i7 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i7 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i7 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i7 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer.i7(i7 [[IV_RES]], i7 [[NBITS_RES]], i7 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i7 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i7 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i7 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i7 %iv, %extraoffset
  %val.shifted = ashr i7 %val, %nbits
  %val.shifted.iszero = icmp eq i7 %val.shifted, 0
  %iv.next = add i7 %iv, 1

  call void @escape_inner.i7(i7 %iv, i7 %nbits, i7 %val.shifted, i1 %val.shifted.iszero, i7 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i7 [ %iv, %loop ]
  %nbits.res = phi i7 [ %nbits, %loop ]
  %val.shifted.res = phi i7 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i7 [ %iv.next, %loop ]

  call void @escape_outer.i7(i7 %iv.res, i7 %nbits.res, i7 %val.shifted.res, i1 %val.shifted.iszero.res, i7 %iv.next.res)

  ret i7 %iv.res
}

; Step must be 1
define i8 @n8(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n8(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 2
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 2 ; not 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; Cmp-br are commutable
define i8 @t9(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @t9(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i8 @llvm.ctlz.i8(i8 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i8 8, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[TMP0:%.*]] = sub i8 0, [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i8 [[VAL_NUMACTIVEBITS]], [[TMP0]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i8 @llvm.smax.i8(i8 [[VAL_NUMACTIVEBITS_OFFSET]], i8 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i8 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i8 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i8 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i8 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISNOTZERO:%.*]] = xor i1 [[LOOP_IVCHECK]], true
; CHECK-NEXT:    [[IV:%.*]] = add nsw i8 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISNOTZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISNOTZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISNOTZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISNOTZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.isnotzero = icmp ne i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.isnotzero, i8 %iv.next)

  br i1 %val.shifted.isnotzero, label %loop, label %end

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.isnotzero.res = phi i1 [ %val.shifted.isnotzero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.isnotzero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; We want to exit once it becomes zero
define i8 @n10(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n10(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISNOTZERO:%.*]] = icmp ne i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISNOTZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISNOTZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISNOTZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISNOTZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISNOTZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.isnotzero = icmp ne i8 %val.shifted, 0 ; not eq
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.isnotzero, i8 %iv.next)

  br i1 %val.shifted.isnotzero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.isnotzero.res = phi i1 [ %val.shifted.isnotzero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.isnotzero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; Once it compares zero, we want to exit, not exit when it compares non-zero
define i8 @n11(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n11(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[LOOP]], label [[END:%.*]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %loop, label %end ; wrong destinations

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; We must be comparing with 0
define i8 @n12(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n12(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 1
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 1 ; not 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; Loop must have a single block.
define i8 @n13(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n13(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP_END:%.*]] ]
; CHECK-NEXT:    br label [[LOOP_END]]
; CHECK:       loop.end:
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP_END]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP_END]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP_END]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP_END]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP_END]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop.end ]
  br label %loop.end

loop.end:
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop.end ]
  %nbits.res = phi i8 [ %nbits, %loop.end ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop.end ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop.end ]
  %iv.next.res = phi i8 [ %iv.next, %loop.end ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; The comparison must have an equality predicate
define i8 @n14(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n14(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp ult i8 [[VAL_SHIFTED]], 1
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp ult i8 %val.shifted, 1 ; not `==0`
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; offset computation can be commuted
define i8 @t15(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @t15(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i8 @llvm.ctlz.i8(i8 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i8 8, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[TMP0:%.*]] = sub i8 0, [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i8 [[VAL_NUMACTIVEBITS]], [[TMP0]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i8 @llvm.smax.i8(i8 [[VAL_NUMACTIVEBITS_OFFSET]], i8 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i8 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i8 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i8 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i8 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i8 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[EXTRAOFFSET]], [[IV]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %extraoffset, %iv ; swapped order
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; But for `sub nsw`, it is not commutable.
define i8 @n16(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n16(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS:%.*]] = sub nsw i8 [[EXTRAOFFSET:%.*]], [[IV]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = sub nsw i8 %extraoffset, %iv
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; The offset must be loop-invariant
define i8 @n17(i8 %val, i8 %start) mustprogress {
; CHECK-LABEL: @n17(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[EXTRAOFFSET:%.*]] = call i8 @gen.i8()
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %extraoffset = call i8 @gen.i8()
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; Likewise for `sub nsw`.
define i8 @n18(i8 %val, i8 %start) mustprogress {
; CHECK-LABEL: @n18(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[EXTRAOFFSET:%.*]] = call i8 @gen.i8()
; CHECK-NEXT:    [[NBITS:%.*]] = sub nsw i8 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %extraoffset = call i8 @gen.i8()
  %nbits = sub nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; The "induction variable" must be in the loop header.
define i8 @n19(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n19(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_PREHEADER:%.*]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    [[NOTIV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[LOOP_PREHEADER]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[NOTIV]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop.preheader

loop.preheader:
  %notiv = phi i8 [ 0, %entry ]
  br label %loop

loop:
  %iv = phi i8 [ %start, %loop.preheader ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %notiv, %extraoffset ; uses %notiv instead of %iv
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; IV must really be a PHI
define i8 @n20(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n20(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = add i8 0, 0
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = add i8 0, 0 ; again not IV
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; The induction should be actually increasing IV
define i8 @n21(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n21(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT]] = add i8 0, 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 0, 1 ; should be adding to IV

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; We should not just blindly look for add, we should look what IV actually uses.
define i8 @n22(i8 %val, i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n22(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i8 @llvm.ctlz.i8(i8 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i8 8, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[TMP0:%.*]] = sub i8 0, [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i8 [[VAL_NUMACTIVEBITS]], [[TMP0]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i8 @llvm.smax.i8(i8 [[VAL_NUMACTIVEBITS_OFFSET]], i8 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i8 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i8 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i8 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i8 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i8 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[NOT_IV_NEXT:%.*]] = add i8 [[IV]], 1
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i8 [[IV]], 1
; CHECK-NEXT:    [[ALSO_IV_NEXT:%.*]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %not.iv.next = add i8 %iv, 1 ; not used by %iv
  %iv.next = add i8 %iv, 1
  %also.iv.next = add i8 %iv, 1 ; not used by %iv

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

define i8 @n23(i8 %start, i8 %extraoffset) mustprogress {
; CHECK-LABEL: @n23(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL:%.*]] = call i8 @gen.i8()
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %iv, %extraoffset
  %val = call i8 @gen.i8()
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

; Tests with some small bit widths
declare void @escape_inner.i1(i1, i1, i1, i1, i1)
declare void @escape_outer.i1(i1, i1, i1, i1, i1)
declare void @escape_inner.i2(i2, i2, i2, i1, i2)
declare void @escape_outer.i2(i2, i2, i2, i1, i2)
declare void @escape_inner.i3(i3, i3, i3, i1, i3)
declare void @escape_outer.i3(i3, i3, i3, i1, i3)

define i1 @t24_nooffset_i1(i1 %val, i1 %start) mustprogress {
; CHECK-LABEL: @t24_nooffset_i1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i1 @llvm.ctlz.i1(i1 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i1 true, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nuw nsw i1 [[VAL_NUMACTIVEBITS]], false
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i1 @llvm.smax.i1(i1 [[VAL_NUMACTIVEBITS_OFFSET]], i1 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i1 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i1 [[LOOP_BACKEDGETAKENCOUNT]], true
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i1 [[LOOP_IV]], true
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i1 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i1 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i1 [[VAL]], [[IV]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i1 [[IV]], true
; CHECK-NEXT:    call void @escape_inner.i1(i1 [[IV]], i1 [[IV]], i1 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i1 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i1 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i1 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i1 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer.i1(i1 [[IV_RES]], i1 [[IV_RES]], i1 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i1 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i1 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i1 [ %start, %entry ], [ %iv.next, %loop ]
  %val.shifted = ashr i1 %val, %iv
  %val.shifted.iszero = icmp eq i1 %val.shifted, 0
  %iv.next = add i1 %iv, 1

  call void @escape_inner.i1(i1 %iv, i1 %iv, i1 %val.shifted, i1 %val.shifted.iszero, i1 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i1 [ %iv, %loop ]
  %val.shifted.res = phi i1 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i1 [ %iv.next, %loop ]

  call void @escape_outer.i1(i1 %iv.res, i1 %iv.res, i1 %val.shifted.res, i1 %val.shifted.iszero.res, i1 %iv.next.res)

  ret i1 %iv.res
}
define i2 @t25_nooffset_i2(i2 %val, i2 %start) mustprogress {
; CHECK-LABEL: @t25_nooffset_i2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i2 @llvm.ctlz.i2(i2 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw i2 -2, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nuw nsw i2 [[VAL_NUMACTIVEBITS]], 0
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i2 @llvm.smax.i2(i2 [[VAL_NUMACTIVEBITS_OFFSET]], i2 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i2 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw i2 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i2 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw i2 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i2 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i2 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i2 [[VAL]], [[IV]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i2 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner.i2(i2 [[IV]], i2 [[IV]], i2 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i2 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i2 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i2 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i2 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer.i2(i2 [[IV_RES]], i2 [[IV_RES]], i2 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i2 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i2 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i2 [ %start, %entry ], [ %iv.next, %loop ]
  %val.shifted = ashr i2 %val, %iv
  %val.shifted.iszero = icmp eq i2 %val.shifted, 0
  %iv.next = add i2 %iv, 1

  call void @escape_inner.i2(i2 %iv, i2 %iv, i2 %val.shifted, i1 %val.shifted.iszero, i2 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i2 [ %iv, %loop ]
  %val.shifted.res = phi i2 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i2 [ %iv.next, %loop ]

  call void @escape_outer.i2(i2 %iv.res, i2 %iv.res, i2 %val.shifted.res, i1 %val.shifted.iszero.res, i2 %iv.next.res)

  ret i2 %iv.res
}
define i3 @t26_nooffset_i3(i3 %val, i3 %start) mustprogress {
; CHECK-LABEL: @t26_nooffset_i3(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i3 @llvm.ctlz.i3(i3 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i3 3, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nuw nsw i3 [[VAL_NUMACTIVEBITS]], 0
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i3 @llvm.smax.i3(i3 [[VAL_NUMACTIVEBITS_OFFSET]], i3 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i3 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i3 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i3 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i3 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i3 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i3 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i3 [[VAL]], [[IV]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i3 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner.i3(i3 [[IV]], i3 [[IV]], i3 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i3 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i3 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i3 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i3 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer.i3(i3 [[IV_RES]], i3 [[IV_RES]], i3 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i3 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i3 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i3 [ %start, %entry ], [ %iv.next, %loop ]
  %val.shifted = ashr i3 %val, %iv
  %val.shifted.iszero = icmp eq i3 %val.shifted, 0
  %iv.next = add i3 %iv, 1

  call void @escape_inner.i3(i3 %iv, i3 %iv, i3 %val.shifted, i1 %val.shifted.iszero, i3 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i3 [ %iv, %loop ]
  %val.shifted.res = phi i3 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i3 [ %iv.next, %loop ]

  call void @escape_outer.i3(i3 %iv.res, i3 %iv.res, i3 %val.shifted.res, i1 %val.shifted.iszero.res, i3 %iv.next.res)

  ret i3 %iv.res
}

define i1 @t27_addnsw_i1(i1 %val, i1 %start, i1 %extraoffset) mustprogress {
; CHECK-LABEL: @t27_addnsw_i1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i1 @llvm.ctlz.i1(i1 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i1 true, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i1 [[VAL_NUMACTIVEBITS]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i1 @llvm.smax.i1(i1 [[VAL_NUMACTIVEBITS_OFFSET]], i1 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i1 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i1 [[LOOP_BACKEDGETAKENCOUNT]], true
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i1 [[LOOP_IV]], true
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i1 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i1 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i1 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i1 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i1 [[IV]], true
; CHECK-NEXT:    call void @escape_inner.i1(i1 [[IV]], i1 [[NBITS]], i1 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i1 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i1 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i1 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i1 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i1 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer.i1(i1 [[IV_RES]], i1 [[NBITS_RES]], i1 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i1 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i1 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i1 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i1 %iv, %extraoffset
  %val.shifted = ashr i1 %val, %nbits
  %val.shifted.iszero = icmp eq i1 %val.shifted, 0
  %iv.next = add i1 %iv, 1

  call void @escape_inner.i1(i1 %iv, i1 %nbits, i1 %val.shifted, i1 %val.shifted.iszero, i1 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i1 [ %iv, %loop ]
  %nbits.res = phi i1 [ %nbits, %loop ]
  %val.shifted.res = phi i1 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i1 [ %iv.next, %loop ]

  call void @escape_outer.i1(i1 %iv.res, i1 %nbits.res, i1 %val.shifted.res, i1 %val.shifted.iszero.res, i1 %iv.next.res)

  ret i1 %iv.res
}
define i2 @t28_addnsw_i2(i2 %val, i2 %start, i2 %extraoffset) mustprogress {
; CHECK-LABEL: @t28_addnsw_i2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i2 @llvm.ctlz.i2(i2 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw i2 -2, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[TMP0:%.*]] = sub i2 0, [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i2 [[VAL_NUMACTIVEBITS]], [[TMP0]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i2 @llvm.smax.i2(i2 [[VAL_NUMACTIVEBITS_OFFSET]], i2 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i2 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw i2 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i2 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw i2 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i2 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i2 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i2 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i2 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i2 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner.i2(i2 [[IV]], i2 [[NBITS]], i2 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i2 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i2 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i2 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i2 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i2 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer.i2(i2 [[IV_RES]], i2 [[NBITS_RES]], i2 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i2 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i2 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i2 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i2 %iv, %extraoffset
  %val.shifted = ashr i2 %val, %nbits
  %val.shifted.iszero = icmp eq i2 %val.shifted, 0
  %iv.next = add i2 %iv, 1

  call void @escape_inner.i2(i2 %iv, i2 %nbits, i2 %val.shifted, i1 %val.shifted.iszero, i2 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i2 [ %iv, %loop ]
  %nbits.res = phi i2 [ %nbits, %loop ]
  %val.shifted.res = phi i2 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i2 [ %iv.next, %loop ]

  call void @escape_outer.i2(i2 %iv.res, i2 %nbits.res, i2 %val.shifted.res, i1 %val.shifted.iszero.res, i2 %iv.next.res)

  ret i2 %iv.res
}
define i3 @t29_addnsw_i3(i3 %val, i3 %start, i3 %extraoffset) mustprogress {
; CHECK-LABEL: @t29_addnsw_i3(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i3 @llvm.ctlz.i3(i3 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i3 3, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[TMP0:%.*]] = sub i3 0, [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i3 [[VAL_NUMACTIVEBITS]], [[TMP0]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i3 @llvm.smax.i3(i3 [[VAL_NUMACTIVEBITS_OFFSET]], i3 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i3 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i3 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i3 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i3 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i3 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i3 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i3 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i3 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i3 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner.i3(i3 [[IV]], i3 [[NBITS]], i3 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i3 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i3 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i3 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i3 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i3 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer.i3(i3 [[IV_RES]], i3 [[NBITS_RES]], i3 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i3 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i3 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i3 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i3 %iv, %extraoffset
  %val.shifted = ashr i3 %val, %nbits
  %val.shifted.iszero = icmp eq i3 %val.shifted, 0
  %iv.next = add i3 %iv, 1

  call void @escape_inner.i3(i3 %iv, i3 %nbits, i3 %val.shifted, i1 %val.shifted.iszero, i3 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i3 [ %iv, %loop ]
  %nbits.res = phi i3 [ %nbits, %loop ]
  %val.shifted.res = phi i3 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i3 [ %iv.next, %loop ]

  call void @escape_outer.i3(i3 %iv.res, i3 %nbits.res, i3 %val.shifted.res, i1 %val.shifted.iszero.res, i3 %iv.next.res)

  ret i3 %iv.res
}

define i1 @t30_addnuw_i1(i1 %val, i1 %start, i1 %extraoffset) mustprogress {
; CHECK-LABEL: @t30_addnuw_i1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i1 @llvm.ctlz.i1(i1 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i1 true, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i1 [[VAL_NUMACTIVEBITS]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i1 @llvm.smax.i1(i1 [[VAL_NUMACTIVEBITS_OFFSET]], i1 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i1 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i1 [[LOOP_BACKEDGETAKENCOUNT]], true
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i1 [[LOOP_IV]], true
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i1 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i1 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = add nuw i1 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i1 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i1 [[IV]], true
; CHECK-NEXT:    call void @escape_inner.i1(i1 [[IV]], i1 [[NBITS]], i1 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i1 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i1 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i1 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i1 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i1 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer.i1(i1 [[IV_RES]], i1 [[NBITS_RES]], i1 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i1 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i1 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i1 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nuw i1 %iv, %extraoffset
  %val.shifted = ashr i1 %val, %nbits
  %val.shifted.iszero = icmp eq i1 %val.shifted, 0
  %iv.next = add i1 %iv, 1

  call void @escape_inner.i1(i1 %iv, i1 %nbits, i1 %val.shifted, i1 %val.shifted.iszero, i1 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i1 [ %iv, %loop ]
  %nbits.res = phi i1 [ %nbits, %loop ]
  %val.shifted.res = phi i1 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i1 [ %iv.next, %loop ]

  call void @escape_outer.i1(i1 %iv.res, i1 %nbits.res, i1 %val.shifted.res, i1 %val.shifted.iszero.res, i1 %iv.next.res)

  ret i1 %iv.res
}
define i2 @t31_addnuw_i2(i2 %val, i2 %start, i2 %extraoffset) mustprogress {
; CHECK-LABEL: @t31_addnuw_i2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i2 @llvm.ctlz.i2(i2 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw i2 -2, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[TMP0:%.*]] = sub i2 0, [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i2 [[VAL_NUMACTIVEBITS]], [[TMP0]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i2 @llvm.smax.i2(i2 [[VAL_NUMACTIVEBITS_OFFSET]], i2 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i2 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw i2 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i2 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw i2 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i2 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i2 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = add nuw i2 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i2 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i2 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner.i2(i2 [[IV]], i2 [[NBITS]], i2 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i2 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i2 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i2 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i2 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i2 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer.i2(i2 [[IV_RES]], i2 [[NBITS_RES]], i2 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i2 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i2 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i2 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nuw i2 %iv, %extraoffset
  %val.shifted = ashr i2 %val, %nbits
  %val.shifted.iszero = icmp eq i2 %val.shifted, 0
  %iv.next = add i2 %iv, 1

  call void @escape_inner.i2(i2 %iv, i2 %nbits, i2 %val.shifted, i1 %val.shifted.iszero, i2 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i2 [ %iv, %loop ]
  %nbits.res = phi i2 [ %nbits, %loop ]
  %val.shifted.res = phi i2 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i2 [ %iv.next, %loop ]

  call void @escape_outer.i2(i2 %iv.res, i2 %nbits.res, i2 %val.shifted.res, i1 %val.shifted.iszero.res, i2 %iv.next.res)

  ret i2 %iv.res
}
define i3 @t32_addnuw_i3(i3 %val, i3 %start, i3 %extraoffset) mustprogress {
; CHECK-LABEL: @t32_addnuw_i3(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i3 @llvm.ctlz.i3(i3 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i3 3, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[TMP0:%.*]] = sub i3 0, [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i3 [[VAL_NUMACTIVEBITS]], [[TMP0]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i3 @llvm.smax.i3(i3 [[VAL_NUMACTIVEBITS_OFFSET]], i3 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i3 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i3 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i3 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i3 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i3 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i3 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = add nuw i3 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i3 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i3 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner.i3(i3 [[IV]], i3 [[NBITS]], i3 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i3 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i3 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i3 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i3 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i3 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer.i3(i3 [[IV_RES]], i3 [[NBITS_RES]], i3 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i3 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i3 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i3 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nuw i3 %iv, %extraoffset
  %val.shifted = ashr i3 %val, %nbits
  %val.shifted.iszero = icmp eq i3 %val.shifted, 0
  %iv.next = add i3 %iv, 1

  call void @escape_inner.i3(i3 %iv, i3 %nbits, i3 %val.shifted, i1 %val.shifted.iszero, i3 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i3 [ %iv, %loop ]
  %nbits.res = phi i3 [ %nbits, %loop ]
  %val.shifted.res = phi i3 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i3 [ %iv.next, %loop ]

  call void @escape_outer.i3(i3 %iv.res, i3 %nbits.res, i3 %val.shifted.res, i1 %val.shifted.iszero.res, i3 %iv.next.res)

  ret i3 %iv.res
}


define i1 @t33_subnsw_i1(i1 %val, i1 %start, i1 %extraoffset) mustprogress {
; CHECK-LABEL: @t33_subnsw_i1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i1 @llvm.ctlz.i1(i1 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i1 true, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i1 [[VAL_NUMACTIVEBITS]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i1 @llvm.smax.i1(i1 [[VAL_NUMACTIVEBITS_OFFSET]], i1 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i1 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i1 [[LOOP_BACKEDGETAKENCOUNT]], true
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i1 [[LOOP_IV]], true
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i1 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i1 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = sub nsw i1 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i1 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i1 [[IV]], true
; CHECK-NEXT:    call void @escape_inner.i1(i1 [[IV]], i1 [[NBITS]], i1 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i1 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i1 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i1 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i1 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i1 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer.i1(i1 [[IV_RES]], i1 [[NBITS_RES]], i1 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i1 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i1 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i1 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = sub nsw i1 %iv, %extraoffset
  %val.shifted = ashr i1 %val, %nbits
  %val.shifted.iszero = icmp eq i1 %val.shifted, 0
  %iv.next = add i1 %iv, 1

  call void @escape_inner.i1(i1 %iv, i1 %nbits, i1 %val.shifted, i1 %val.shifted.iszero, i1 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i1 [ %iv, %loop ]
  %nbits.res = phi i1 [ %nbits, %loop ]
  %val.shifted.res = phi i1 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i1 [ %iv.next, %loop ]

  call void @escape_outer.i1(i1 %iv.res, i1 %nbits.res, i1 %val.shifted.res, i1 %val.shifted.iszero.res, i1 %iv.next.res)

  ret i1 %iv.res
}
define i2 @t34_addnuw_i2(i2 %val, i2 %start, i2 %extraoffset) mustprogress {
; CHECK-LABEL: @t34_addnuw_i2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i2 @llvm.ctlz.i2(i2 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw i2 -2, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i2 [[VAL_NUMACTIVEBITS]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i2 @llvm.smax.i2(i2 [[VAL_NUMACTIVEBITS_OFFSET]], i2 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i2 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw i2 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i2 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw i2 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i2 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i2 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = sub nsw i2 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i2 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i2 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner.i2(i2 [[IV]], i2 [[NBITS]], i2 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i2 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i2 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i2 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i2 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i2 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer.i2(i2 [[IV_RES]], i2 [[NBITS_RES]], i2 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i2 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i2 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i2 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = sub nsw i2 %iv, %extraoffset
  %val.shifted = ashr i2 %val, %nbits
  %val.shifted.iszero = icmp eq i2 %val.shifted, 0
  %iv.next = add i2 %iv, 1

  call void @escape_inner.i2(i2 %iv, i2 %nbits, i2 %val.shifted, i1 %val.shifted.iszero, i2 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i2 [ %iv, %loop ]
  %nbits.res = phi i2 [ %nbits, %loop ]
  %val.shifted.res = phi i2 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i2 [ %iv.next, %loop ]

  call void @escape_outer.i2(i2 %iv.res, i2 %nbits.res, i2 %val.shifted.res, i1 %val.shifted.iszero.res, i2 %iv.next.res)

  ret i2 %iv.res
}
define i3 @t35_addnuw_i3(i3 %val, i3 %start, i3 %extraoffset) mustprogress {
; CHECK-LABEL: @t35_addnuw_i3(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i3 @llvm.ctlz.i3(i3 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i3 3, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i3 [[VAL_NUMACTIVEBITS]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i3 @llvm.smax.i3(i3 [[VAL_NUMACTIVEBITS_OFFSET]], i3 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i3 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i3 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i3 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i3 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i3 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i3 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = sub nsw i3 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i3 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i3 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner.i3(i3 [[IV]], i3 [[NBITS]], i3 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i3 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i3 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i3 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i3 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i3 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer.i3(i3 [[IV_RES]], i3 [[NBITS_RES]], i3 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i3 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i3 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i3 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = sub nsw i3 %iv, %extraoffset
  %val.shifted = ashr i3 %val, %nbits
  %val.shifted.iszero = icmp eq i3 %val.shifted, 0
  %iv.next = add i3 %iv, 1

  call void @escape_inner.i3(i3 %iv, i3 %nbits, i3 %val.shifted, i1 %val.shifted.iszero, i3 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i3 [ %iv, %loop ]
  %nbits.res = phi i3 [ %nbits, %loop ]
  %val.shifted.res = phi i3 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i3 [ %iv.next, %loop ]

  call void @escape_outer.i3(i3 %iv.res, i3 %nbits.res, i3 %val.shifted.res, i1 %val.shifted.iszero.res, i3 %iv.next.res)

  ret i3 %iv.res
}

; For ashr, we must have knowledge that the original loop is finite.
define i8 @n36(i8 %val, i8 %start, i8 %extraoffset) {
; CHECK-LABEL: @n36(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL:%.*]], [[NBITS]]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}

define i8 @p37(i8 %val, i8 %start, i8 %extraoffset) {
; CHECK-LABEL: @p37(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i8 @llvm.ctlz.i8(i8 [[VAL:%.*]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i8 8, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[TMP0:%.*]] = sub i8 0, [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i8 [[VAL_NUMACTIVEBITS]], [[TMP0]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i8 @llvm.smax.i8(i8 [[VAL_NUMACTIVEBITS_OFFSET]], i8 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i8 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i8 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i8 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i8 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i8 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop, !llvm.loop !0

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}
!0 = distinct !{!0, !1}
!1 = !{!"llvm.loop.mustprogress"}

define i8 @p38(i8 %val.crude, i8 %start, i8 %extraoffset) {
; CHECK-LABEL: @p38(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[VAL:%.*]] = and i8 [[VAL_CRUDE:%.*]], 127
; CHECK-NEXT:    [[VAL_NUMLEADINGZEROS:%.*]] = call i8 @llvm.ctlz.i8(i8 [[VAL]], i1 false)
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS:%.*]] = sub nuw nsw i8 8, [[VAL_NUMLEADINGZEROS]]
; CHECK-NEXT:    [[TMP0:%.*]] = sub i8 0, [[EXTRAOFFSET:%.*]]
; CHECK-NEXT:    [[VAL_NUMACTIVEBITS_OFFSET:%.*]] = add nsw i8 [[VAL_NUMACTIVEBITS]], [[TMP0]]
; CHECK-NEXT:    [[IV_FINAL:%.*]] = call i8 @llvm.smax.i8(i8 [[VAL_NUMACTIVEBITS_OFFSET]], i8 [[START:%.*]])
; CHECK-NEXT:    [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nsw i8 [[IV_FINAL]], [[START]]
; CHECK-NEXT:    [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i8 [[LOOP_BACKEDGETAKENCOUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[LOOP_IV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[LOOP_IV_NEXT]] = add nuw nsw i8 [[LOOP_IV]], 1
; CHECK-NEXT:    [[LOOP_IVCHECK:%.*]] = icmp eq i8 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]]
; CHECK-NEXT:    [[IV:%.*]] = add nsw i8 [[LOOP_IV]], [[START]]
; CHECK-NEXT:    [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET]]
; CHECK-NEXT:    [[VAL_SHIFTED:%.*]] = ashr i8 [[VAL]], [[NBITS]]
; CHECK-NEXT:    [[IV_NEXT:%.*]] = add i8 [[IV]], 1
; CHECK-NEXT:    call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[LOOP_IVCHECK]], i8 [[IV_NEXT]])
; CHECK-NEXT:    br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]]
; CHECK:       end:
; CHECK-NEXT:    [[IV_RES:%.*]] = phi i8 [ [[IV_FINAL]], [[LOOP]] ]
; CHECK-NEXT:    [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
; CHECK-NEXT:    [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[LOOP_IVCHECK]], [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
; CHECK-NEXT:    ret i8 [[IV_RES]]
;
entry:
  %val = and i8 %val.crude, 127
  br label %loop

loop:
  %iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
  %nbits = add nsw i8 %iv, %extraoffset
  %val.shifted = ashr i8 %val, %nbits
  %val.shifted.iszero = icmp eq i8 %val.shifted, 0
  %iv.next = add i8 %iv, 1

  call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)

  br i1 %val.shifted.iszero, label %end, label %loop

end:
  %iv.res = phi i8 [ %iv, %loop ]
  %nbits.res = phi i8 [ %nbits, %loop ]
  %val.shifted.res = phi i8 [ %val.shifted, %loop ]
  %val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
  %iv.next.res = phi i8 [ %iv.next, %loop ]

  call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)

  ret i8 %iv.res
}