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llvm-mirror/test/Transforms/DeadStoreElimination/multiblock-loops.ll
David Green 51d7c2c19b [DSE] Remove stores in the same loop iteration 
DSE will currently only remove stores in the same block unless they can
be guaranteed to be loop invariant. This expands that to any stores that
are in the same Loop, at the same loop level. This should still account
for where AA/MSSA will not handle aliasing between loops, but allow the
dead stores to be removed where they overlap in the same loop iteration.
It requires adding loop info to DSE, but that looks fairly harmless.

The test case this helps is from code like this, which can come up in
certain matrix operations:
  for(i=..)
    dst[i] = 0;
    for(j=..)
      dst[i] += src[i*n+j];

After LICM, this becomes:
for(i=..)
  dst[i] = 0;
  sum = 0;
  for(j=..)
    sum += src[i*n+j];
  dst[i] = sum;

The first store is dead, and with this patch is now removed.

Differntial Revision: https://reviews.llvm.org/D100464
2021-06-20 17:03:30 +01:00

990 lines
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LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -basic-aa -dse -S | FileCheck %s
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
define void @test13(i32* noalias %P) {
; CHECK-LABEL: @test13(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR:%.*]]
; CHECK: for:
; CHECK-NEXT: store i32 0, i32* [[P:%.*]], align 4
; CHECK-NEXT: br i1 false, label [[FOR]], label [[END:%.*]]
; CHECK: end:
; CHECK-NEXT: ret void
;
entry:
br label %for
for:
store i32 0, i32* %P
br i1 false, label %for, label %end
end:
ret void
}
define void @test14(i32* noalias %P) {
; CHECK-LABEL: @test14(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR:%.*]]
; CHECK: for:
; CHECK-NEXT: store i32 0, i32* [[P:%.*]], align 4
; CHECK-NEXT: br i1 false, label [[FOR]], label [[END:%.*]]
; CHECK: end:
; CHECK-NEXT: ret void
;
entry:
store i32 1, i32* %P
br label %for
for:
store i32 0, i32* %P
br i1 false, label %for, label %end
end:
ret void
}
define void @test18(i32* noalias %P) {
; CHECK-LABEL: @test18(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[P2:%.*]] = bitcast i32* [[P:%.*]] to i8*
; CHECK-NEXT: store i32 0, i32* [[P]], align 4
; CHECK-NEXT: br label [[FOR:%.*]]
; CHECK: for:
; CHECK-NEXT: store i8 1, i8* [[P2]], align 1
; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[P]], align 4
; CHECK-NEXT: store i8 2, i8* [[P2]], align 1
; CHECK-NEXT: br i1 false, label [[FOR]], label [[END:%.*]]
; CHECK: end:
; CHECK-NEXT: ret void
;
entry:
%P2 = bitcast i32* %P to i8*
store i32 0, i32* %P
br label %for
for:
store i8 1, i8* %P2
%x = load i32, i32* %P
store i8 2, i8* %P2
br i1 false, label %for, label %end
end:
ret void
}
define void @test21(i32* noalias %P) {
; CHECK-LABEL: @test21(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[ARRAYIDX0:%.*]] = getelementptr inbounds i32, i32* [[P:%.*]], i64 1
; CHECK-NEXT: [[P3:%.*]] = bitcast i32* [[ARRAYIDX0]] to i8*
; CHECK-NEXT: [[TMP0:%.*]] = getelementptr inbounds i8, i8* [[P3]], i64 4
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 4 [[TMP0]], i8 0, i64 24, i1 false)
; CHECK-NEXT: br label [[FOR:%.*]]
; CHECK: for:
; CHECK-NEXT: [[ARRAYIDX1:%.*]] = getelementptr inbounds i32, i32* [[P]], i64 1
; CHECK-NEXT: store i32 1, i32* [[ARRAYIDX1]], align 4
; CHECK-NEXT: br i1 false, label [[FOR]], label [[END:%.*]]
; CHECK: end:
; CHECK-NEXT: ret void
;
entry:
%arrayidx0 = getelementptr inbounds i32, i32* %P, i64 1
%p3 = bitcast i32* %arrayidx0 to i8*
call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 28, i32 4, i1 false)
br label %for
for:
%arrayidx1 = getelementptr inbounds i32, i32* %P, i64 1
store i32 1, i32* %arrayidx1, align 4
br i1 false, label %for, label %end
end:
ret void
}
define void @test_loop(i32 %N, i32* noalias nocapture readonly %A, i32* noalias nocapture readonly %x, i32* noalias nocapture %b) local_unnamed_addr {
; CHECK-LABEL: @test_loop(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP27:%.*]] = icmp sgt i32 [[N:%.*]], 0
; CHECK-NEXT: br i1 [[CMP27]], label [[FOR_BODY4_LR_PH_PREHEADER:%.*]], label [[FOR_COND_CLEANUP:%.*]]
; CHECK: for.body4.lr.ph.preheader:
; CHECK-NEXT: br label [[FOR_BODY4_LR_PH:%.*]]
; CHECK: for.cond.cleanup:
; CHECK-NEXT: ret void
; CHECK: for.body4.lr.ph:
; CHECK-NEXT: [[I_028:%.*]] = phi i32 [ [[INC11:%.*]], [[FOR_COND_CLEANUP3:%.*]] ], [ 0, [[FOR_BODY4_LR_PH_PREHEADER]] ]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* [[B:%.*]], i32 [[I_028]]
; CHECK-NEXT: [[MUL:%.*]] = mul nsw i32 [[I_028]], [[N]]
; CHECK-NEXT: br label [[FOR_BODY4:%.*]]
; CHECK: for.body4:
; CHECK-NEXT: [[TMP0:%.*]] = phi i32 [ 0, [[FOR_BODY4_LR_PH]] ], [ [[ADD9:%.*]], [[FOR_BODY4]] ]
; CHECK-NEXT: [[J_026:%.*]] = phi i32 [ 0, [[FOR_BODY4_LR_PH]] ], [ [[INC:%.*]], [[FOR_BODY4]] ]
; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[J_026]], [[MUL]]
; CHECK-NEXT: [[ARRAYIDX5:%.*]] = getelementptr inbounds i32, i32* [[A:%.*]], i32 [[ADD]]
; CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* [[ARRAYIDX5]], align 4
; CHECK-NEXT: [[ARRAYIDX6:%.*]] = getelementptr inbounds i32, i32* [[X:%.*]], i32 [[J_026]]
; CHECK-NEXT: [[TMP2:%.*]] = load i32, i32* [[ARRAYIDX6]], align 4
; CHECK-NEXT: [[MUL7:%.*]] = mul nsw i32 [[TMP2]], [[TMP1]]
; CHECK-NEXT: [[ADD9]] = add nsw i32 [[MUL7]], [[TMP0]]
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[J_026]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i32 [[INC]], [[N]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_COND_CLEANUP3]], label [[FOR_BODY4]]
; CHECK: for.cond.cleanup3:
; CHECK-NEXT: store i32 [[ADD9]], i32* [[ARRAYIDX]], align 4
; CHECK-NEXT: [[INC11]] = add nuw nsw i32 [[I_028]], 1
; CHECK-NEXT: [[EXITCOND29:%.*]] = icmp eq i32 [[INC11]], [[N]]
; CHECK-NEXT: br i1 [[EXITCOND29]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY4_LR_PH]]
;
entry:
%cmp27 = icmp sgt i32 %N, 0
br i1 %cmp27, label %for.body4.lr.ph.preheader, label %for.cond.cleanup
for.body4.lr.ph.preheader: ; preds = %entry
br label %for.body4.lr.ph
for.cond.cleanup: ; preds = %for.cond.cleanup3, %entry
ret void
for.body4.lr.ph: ; preds = %for.body4.lr.ph.preheader, %for.cond.cleanup3
%i.028 = phi i32 [ %inc11, %for.cond.cleanup3 ], [ 0, %for.body4.lr.ph.preheader ]
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.028
store i32 0, i32* %arrayidx, align 4
%mul = mul nsw i32 %i.028, %N
br label %for.body4
for.body4: ; preds = %for.body4, %for.body4.lr.ph
%0 = phi i32 [ 0, %for.body4.lr.ph ], [ %add9, %for.body4 ]
%j.026 = phi i32 [ 0, %for.body4.lr.ph ], [ %inc, %for.body4 ]
%add = add nsw i32 %j.026, %mul
%arrayidx5 = getelementptr inbounds i32, i32* %A, i32 %add
%1 = load i32, i32* %arrayidx5, align 4
%arrayidx6 = getelementptr inbounds i32, i32* %x, i32 %j.026
%2 = load i32, i32* %arrayidx6, align 4
%mul7 = mul nsw i32 %2, %1
%add9 = add nsw i32 %mul7, %0
%inc = add nuw nsw i32 %j.026, 1
%exitcond = icmp eq i32 %inc, %N
br i1 %exitcond, label %for.cond.cleanup3, label %for.body4
for.cond.cleanup3: ; preds = %for.body4
store i32 %add9, i32* %arrayidx, align 4
%inc11 = add nuw nsw i32 %i.028, 1
%exitcond29 = icmp eq i32 %inc11, %N
br i1 %exitcond29, label %for.cond.cleanup, label %for.body4.lr.ph
}
define i32 @test_if(i1 %c, i32* %p, i32 %i) {
; CHECK-LABEL: @test_if(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[PH:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[BB3:%.*]] ]
; CHECK-NEXT: [[INC]] = add i32 [[PH]], 1
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, i32* [[P:%.*]], i32 [[PH]]
; CHECK-NEXT: br i1 [[C:%.*]], label [[BB2:%.*]], label [[BB3]]
; CHECK: bb2:
; CHECK-NEXT: br label [[BB3]]
; CHECK: bb3:
; CHECK-NEXT: store i32 2, i32* [[GEP]], align 4
; CHECK-NEXT: [[C1:%.*]] = icmp slt i32 [[PH]], 10
; CHECK-NEXT: br i1 [[C1]], label [[BB1]], label [[EXIT:%.*]]
; CHECK: exit:
; CHECK-NEXT: ret i32 0
;
entry:
br label %bb1
bb1:
%ph = phi i32 [ 0, %entry ], [ %inc, %bb3 ]
%inc = add i32 %ph, 1
%gep = getelementptr inbounds i32, i32* %p, i32 %ph
store i32 %i, i32* %gep, align 4
br i1 %c, label %bb2, label %bb3
bb2:
br label %bb3
bb3:
store i32 2, i32* %gep, align 4
%c1 = icmp slt i32 %ph, 10
br i1 %c1, label %bb1, label %exit
exit:
ret i32 0
}
define i32 @test_if2(i1 %c, i32* %p, i32 %i) {
; CHECK-LABEL: @test_if2(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[PH:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[BB2:%.*]] ], [ [[INC]], [[BB3:%.*]] ]
; CHECK-NEXT: [[INC]] = add i32 [[PH]], 1
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, i32* [[P:%.*]], i32 [[PH]]
; CHECK-NEXT: br i1 [[C:%.*]], label [[BB2]], label [[BB3]]
; CHECK: bb2:
; CHECK-NEXT: store i32 2, i32* [[GEP]], align 4
; CHECK-NEXT: [[C1:%.*]] = icmp slt i32 [[PH]], 10
; CHECK-NEXT: br i1 [[C1]], label [[BB1]], label [[EXIT:%.*]]
; CHECK: bb3:
; CHECK-NEXT: store i32 3, i32* [[GEP]], align 4
; CHECK-NEXT: [[C2:%.*]] = icmp slt i32 [[PH]], 5
; CHECK-NEXT: br i1 [[C2]], label [[BB1]], label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret i32 0
;
entry:
br label %bb1
bb1:
%ph = phi i32 [ 0, %entry ], [ %inc, %bb2 ], [ %inc, %bb3 ]
%inc = add i32 %ph, 1
%gep = getelementptr inbounds i32, i32* %p, i32 %ph
store i32 %i, i32* %gep, align 4
br i1 %c, label %bb2, label %bb3
bb2:
store i32 2, i32* %gep, align 4
%c1 = icmp slt i32 %ph, 10
br i1 %c1, label %bb1, label %exit
bb3:
store i32 3, i32* %gep, align 4
%c2 = icmp slt i32 %ph, 5
br i1 %c2, label %bb1, label %exit
exit:
ret i32 0
}
define i32 @test_if3(i1 %c, i32* %p, i32 %i) {
; CHECK-LABEL: @test_if3(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[PH:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[BB3:%.*]] ]
; CHECK-NEXT: [[INC]] = add i32 [[PH]], 1
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, i32* [[P:%.*]], i32 [[PH]]
; CHECK-NEXT: store i32 [[I:%.*]], i32* [[GEP]], align 4
; CHECK-NEXT: br i1 [[C:%.*]], label [[BB2:%.*]], label [[BB3]]
; CHECK: bb2:
; CHECK-NEXT: store i32 2, i32* [[GEP]], align 4
; CHECK-NEXT: br label [[BB3]]
; CHECK: bb3:
; CHECK-NEXT: [[C1:%.*]] = icmp slt i32 [[PH]], 10
; CHECK-NEXT: br i1 [[C1]], label [[BB1]], label [[EXIT:%.*]]
; CHECK: exit:
; CHECK-NEXT: ret i32 0
;
entry:
br label %bb1
bb1:
%ph = phi i32 [ 0, %entry ], [ %inc, %bb3 ]
%inc = add i32 %ph, 1
%gep = getelementptr inbounds i32, i32* %p, i32 %ph
store i32 %i, i32* %gep, align 4
br i1 %c, label %bb2, label %bb3
bb2:
store i32 2, i32* %gep, align 4
br label %bb3
bb3:
%c1 = icmp slt i32 %ph, 10
br i1 %c1, label %bb1, label %exit
exit:
ret i32 0
}
define i32 @test_if4(i1 %c, i32* %p, i32 %i) {
; CHECK-LABEL: @test_if4(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[PH:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[BB1]] ], [ [[INC]], [[BB2:%.*]] ]
; CHECK-NEXT: [[INC]] = add i32 [[PH]], 1
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, i32* [[P:%.*]], i32 [[PH]]
; CHECK-NEXT: store i32 [[I:%.*]], i32* [[GEP]], align 4
; CHECK-NEXT: br i1 [[C:%.*]], label [[BB2]], label [[BB1]]
; CHECK: bb2:
; CHECK-NEXT: store i32 2, i32* [[GEP]], align 4
; CHECK-NEXT: [[C1:%.*]] = icmp slt i32 [[PH]], 10
; CHECK-NEXT: br i1 [[C1]], label [[BB1]], label [[EXIT:%.*]]
; CHECK: exit:
; CHECK-NEXT: ret i32 0
;
entry:
br label %bb1
bb1:
%ph = phi i32 [ 0, %entry ], [ %inc, %bb1 ], [ %inc, %bb2 ]
%inc = add i32 %ph, 1
%gep = getelementptr inbounds i32, i32* %p, i32 %ph
store i32 %i, i32* %gep, align 4
br i1 %c, label %bb2, label %bb1
bb2:
store i32 2, i32* %gep, align 4
%c1 = icmp slt i32 %ph, 10
br i1 %c1, label %bb1, label %exit
exit:
ret i32 0
}
declare void @clobber()
define i32 @test_self(i1 %c, i32* %p, i32 %i) {
; CHECK-LABEL: @test_self(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[PH:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[BB1]] ], [ [[INC]], [[BB2:%.*]] ]
; CHECK-NEXT: [[INC]] = add i32 [[PH]], 1
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, i32* [[P:%.*]], i32 [[PH]]
; CHECK-NEXT: store i32 1, i32* [[GEP]], align 4
; CHECK-NEXT: call void @clobber()
; CHECK-NEXT: store i32 2, i32* [[GEP]], align 4
; CHECK-NEXT: br i1 [[C:%.*]], label [[BB2]], label [[BB1]]
; CHECK: bb2:
; CHECK-NEXT: store i32 3, i32* [[GEP]], align 4
; CHECK-NEXT: [[C1:%.*]] = icmp slt i32 [[PH]], 10
; CHECK-NEXT: br i1 [[C1]], label [[BB1]], label [[EXIT:%.*]]
; CHECK: exit:
; CHECK-NEXT: ret i32 0
;
entry:
br label %bb1
bb1:
%ph = phi i32 [ 0, %entry ], [ %inc, %bb1 ], [ %inc, %bb2 ]
%inc = add i32 %ph, 1
%gep = getelementptr inbounds i32, i32* %p, i32 %ph
store i32 1, i32* %gep, align 4
call void @clobber()
store i32 2, i32* %gep, align 4
br i1 %c, label %bb2, label %bb1
bb2:
store i32 3, i32* %gep, align 4
%c1 = icmp slt i32 %ph, 10
br i1 %c1, label %bb1, label %exit
exit:
ret i32 0
}
define i32 @test_selfalloca(i1 %c, i32 %i) {
; CHECK-LABEL: @test_selfalloca(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[P:%.*]] = alloca i32, align 4
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[PH:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[BB1]] ], [ [[INC]], [[BB2:%.*]] ]
; CHECK-NEXT: [[INC]] = add i32 [[PH]], 1
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, i32* [[P]], i32 [[PH]]
; CHECK-NEXT: call void @clobber()
; CHECK-NEXT: store i32 2, i32* [[GEP]], align 4
; CHECK-NEXT: br i1 [[C:%.*]], label [[BB2]], label [[BB1]]
; CHECK: bb2:
; CHECK-NEXT: store i32 3, i32* [[GEP]], align 4
; CHECK-NEXT: [[C1:%.*]] = icmp slt i32 [[PH]], 10
; CHECK-NEXT: br i1 [[C1]], label [[BB1]], label [[EXIT:%.*]]
; CHECK: exit:
; CHECK-NEXT: [[PG:%.*]] = getelementptr inbounds i32, i32* [[P]], i32 [[I:%.*]]
; CHECK-NEXT: [[L:%.*]] = load i32, i32* [[PG]], align 4
; CHECK-NEXT: ret i32 [[L]]
;
entry:
%p = alloca i32, align 4
br label %bb1
bb1:
%ph = phi i32 [ 0, %entry ], [ %inc, %bb1 ], [ %inc, %bb2 ]
%inc = add i32 %ph, 1
%gep = getelementptr inbounds i32, i32* %p, i32 %ph
store i32 1, i32* %gep, align 4
call void @clobber()
store i32 2, i32* %gep, align 4
br i1 %c, label %bb2, label %bb1
bb2:
store i32 3, i32* %gep, align 4
%c1 = icmp slt i32 %ph, 10
br i1 %c1, label %bb1, label %exit
exit:
%pg = getelementptr inbounds i32, i32* %p, i32 %i
%l = load i32, i32* %pg
ret i32 %l
}
declare i1 @cond() readnone
; TODO: We can eliminate the store in for.header, but we currently hit a MemoryPhi.
define void @loop_multiple_def_uses(i32* noalias %P) {
; CHECK-LABEL: @loop_multiple_def_uses(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_HEADER:%.*]]
; CHECK: for.header:
; CHECK-NEXT: store i32 1, i32* [[P:%.*]], align 4
; CHECK-NEXT: [[C1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[C1]], label [[FOR_BODY:%.*]], label [[END:%.*]]
; CHECK: for.body:
; CHECK-NEXT: store i32 2, i32* [[P]], align 4
; CHECK-NEXT: [[LV:%.*]] = load i32, i32* [[P]], align 4
; CHECK-NEXT: br label [[FOR_HEADER]]
; CHECK: end:
; CHECK-NEXT: store i32 3, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
entry:
br label %for.header
for.header:
store i32 1, i32* %P, align 4
%c1 = call i1 @cond()
br i1 %c1, label %for.body, label %end
for.body:
store i32 2, i32* %P, align 4
%lv = load i32, i32* %P
br label %for.header
end:
store i32 3, i32* %P, align 4
ret void
}
; We cannot eliminate the store in for.header, as it is only partially
; overwritten in for.body and read afterwards.
define void @loop_multiple_def_uses_partial_write(i32* noalias %p) {
; CHECK-LABEL: @loop_multiple_def_uses_partial_write(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_HEADER:%.*]]
; CHECK: for.header:
; CHECK-NEXT: store i32 1239491, i32* [[P:%.*]], align 4
; CHECK-NEXT: [[C1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[C1]], label [[FOR_BODY:%.*]], label [[END:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[C:%.*]] = bitcast i32* [[P]] to i8*
; CHECK-NEXT: store i8 1, i8* [[C]], align 4
; CHECK-NEXT: [[LV:%.*]] = load i32, i32* [[P]], align 4
; CHECK-NEXT: br label [[FOR_HEADER]]
; CHECK: end:
; CHECK-NEXT: store i32 3, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
entry:
br label %for.header
for.header:
store i32 1239491, i32* %p, align 4
%c1 = call i1 @cond()
br i1 %c1, label %for.body, label %end
for.body:
%c = bitcast i32* %p to i8*
store i8 1, i8* %c, align 4
%lv = load i32, i32* %p
br label %for.header
end:
store i32 3, i32* %p, align 4
ret void
}
; We cannot eliminate the store in for.header, as the location is not overwritten
; in for.body and read afterwards.
define void @loop_multiple_def_uses_mayalias_write(i32* %p, i32* %q) {
; CHECK-LABEL: @loop_multiple_def_uses_mayalias_write(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_HEADER:%.*]]
; CHECK: for.header:
; CHECK-NEXT: store i32 1239491, i32* [[P:%.*]], align 4
; CHECK-NEXT: [[C1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[C1]], label [[FOR_BODY:%.*]], label [[END:%.*]]
; CHECK: for.body:
; CHECK-NEXT: store i32 1, i32* [[Q:%.*]], align 4
; CHECK-NEXT: [[LV:%.*]] = load i32, i32* [[P]], align 4
; CHECK-NEXT: br label [[FOR_HEADER]]
; CHECK: end:
; CHECK-NEXT: store i32 3, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
entry:
br label %for.header
for.header:
store i32 1239491, i32* %p, align 4
%c1 = call i1 @cond()
br i1 %c1, label %for.body, label %end
for.body:
store i32 1, i32* %q, align 4
%lv = load i32, i32* %p
br label %for.header
end:
store i32 3, i32* %p, align 4
ret void
}
%struct.hoge = type { i32, i32 }
@global = external local_unnamed_addr global %struct.hoge*, align 8
define void @widget(i8* %tmp) {
; CHECK-LABEL: @widget(
; CHECK-NEXT: bb:
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 [[TMP:%.*]], i8* nonnull align 16 undef, i64 64, i1 false)
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[TMP2:%.*]] = load %struct.hoge*, %struct.hoge** @global, align 8
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds [[STRUCT_HOGE:%.*]], %struct.hoge* [[TMP2]], i64 undef, i32 1
; CHECK-NEXT: store i32 0, i32* [[TMP3]], align 4
; CHECK-NEXT: [[TMP4:%.*]] = load %struct.hoge*, %struct.hoge** @global, align 8
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds [[STRUCT_HOGE]], %struct.hoge* [[TMP4]], i64 undef, i32 1
; CHECK-NEXT: store i32 10, i32* [[TMP5]], align 4
; CHECK-NEXT: br label [[BB1]]
;
bb:
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %tmp, i8* nonnull align 16 undef, i64 64, i1 false)
br label %bb1
bb1: ; preds = %bb1, %bb
%tmp2 = load %struct.hoge*, %struct.hoge** @global, align 8
%tmp3 = getelementptr inbounds %struct.hoge, %struct.hoge* %tmp2, i64 undef, i32 1
store i32 0, i32* %tmp3, align 4
%tmp4 = load %struct.hoge*, %struct.hoge** @global, align 8
%tmp5 = getelementptr inbounds %struct.hoge, %struct.hoge* %tmp4, i64 undef, i32 1
store i32 10, i32* %tmp5, align 4
br label %bb1
}
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg)
@x = global [10 x i16] zeroinitializer, align 1
; Make sure we do not eliminate the store in %do.body, because it writes to
; multiple locations in the loop and the store in %if.end10 only stores to
; the last one.
define i16 @test_loop_carried_dep() {
; CHECK-LABEL: @test_loop_carried_dep(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[DO_BODY:%.*]]
; CHECK: do.body:
; CHECK-NEXT: [[I_0:%.*]] = phi i16 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[IF_END:%.*]] ]
; CHECK-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 [[I_0]]
; CHECK-NEXT: store i16 2, i16* [[ARRAYIDX2]], align 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i16 [[I_0]], 4
; CHECK-NEXT: br i1 [[EXITCOND]], label [[IF_END10:%.*]], label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: [[INC]] = add nuw nsw i16 [[I_0]], 1
; CHECK-NEXT: br label [[DO_BODY]]
; CHECK: if.end10:
; CHECK-NEXT: store i16 1, i16* [[ARRAYIDX2]], align 1
; CHECK-NEXT: ret i16 0
;
entry:
br label %do.body
do.body: ; preds = %if.end, %entry
%i.0 = phi i16 [ 0, %entry ], [ %inc, %if.end ]
%arrayidx2 = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 %i.0
store i16 2, i16* %arrayidx2, align 1
%exitcond = icmp eq i16 %i.0, 4
br i1 %exitcond, label %if.end10, label %if.end
if.end: ; preds = %do.body
%inc = add nuw nsw i16 %i.0, 1
br label %do.body
if.end10: ; preds = %do.body
store i16 1, i16* %arrayidx2, align 1
ret i16 0
}
; Similar to above, but with an irreducible loop. The stores should not be removed.
define i16 @irreducible(i1 %c) {
; CHECK-LABEL: @irreducible(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[C:%.*]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: [[I_0:%.*]] = phi i16 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[B]] ]
; CHECK-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 [[I_0]]
; CHECK-NEXT: br label [[B]]
; CHECK: B:
; CHECK-NEXT: [[J_0:%.*]] = phi i16 [ 0, [[ENTRY]] ], [ [[I_0]], [[A]] ]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 [[J_0]]
; CHECK-NEXT: store i16 2, i16* [[ARRAYIDX]], align 1
; CHECK-NEXT: [[INC]] = add nuw nsw i16 [[J_0]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i16 [[J_0]], 4
; CHECK-NEXT: br i1 [[EXITCOND]], label [[EXIT:%.*]], label [[A]]
; CHECK: exit:
; CHECK-NEXT: store i16 1, i16* [[ARRAYIDX]], align 1
; CHECK-NEXT: ret i16 0
;
entry:
br i1 %c, label %A, label %B
A:
%i.0 = phi i16 [ 0, %entry ], [ %inc, %B ]
%arrayidx2 = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 %i.0
br label %B
B:
%j.0 = phi i16 [ 0, %entry ], [ %i.0, %A ]
%arrayidx = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 %j.0
store i16 2, i16* %arrayidx, align 1
%inc = add nuw nsw i16 %j.0, 1
%exitcond = icmp eq i16 %j.0, 4
br i1 %exitcond, label %exit, label %A
exit:
store i16 1, i16* %arrayidx, align 1
ret i16 0
}
; An irreducible loop inside another loop.
define i16 @irreducible_nested() {
; CHECK-LABEL: @irreducible_nested(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[OUTER:%.*]]
; CHECK: outer:
; CHECK-NEXT: [[X:%.*]] = phi i16 [ 0, [[ENTRY:%.*]] ], [ [[INCX:%.*]], [[OUTERL:%.*]] ]
; CHECK-NEXT: [[C:%.*]] = icmp sgt i16 [[X]], 2
; CHECK-NEXT: br i1 [[C]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: [[I_0:%.*]] = phi i16 [ 0, [[OUTER]] ], [ [[INC:%.*]], [[B]] ]
; CHECK-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 [[I_0]]
; CHECK-NEXT: br label [[B]]
; CHECK: B:
; CHECK-NEXT: [[J_0:%.*]] = phi i16 [ 0, [[OUTER]] ], [ [[I_0]], [[A]] ]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 [[J_0]]
; CHECK-NEXT: store i16 2, i16* [[ARRAYIDX]], align 1
; CHECK-NEXT: [[INC]] = add nuw nsw i16 [[J_0]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i16 [[J_0]], 4
; CHECK-NEXT: br i1 [[EXITCOND]], label [[OUTERL]], label [[A]]
; CHECK: outerl:
; CHECK-NEXT: store i16 1, i16* [[ARRAYIDX]], align 1
; CHECK-NEXT: [[INCX]] = add nuw nsw i16 [[X]], 1
; CHECK-NEXT: [[EXITCONDX:%.*]] = icmp eq i16 [[X]], 4
; CHECK-NEXT: br i1 [[EXITCONDX]], label [[END:%.*]], label [[OUTER]]
; CHECK: end:
; CHECK-NEXT: ret i16 0
;
entry:
br label %outer
outer:
%x = phi i16 [ 0, %entry ], [ %incx, %outerl ]
%c = icmp sgt i16 %x, 2
br i1 %c, label %A, label %B
A:
%i.0 = phi i16 [ 0, %outer ], [ %inc, %B ]
%arrayidx2 = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 %i.0
br label %B
B:
%j.0 = phi i16 [ 0, %outer ], [ %i.0, %A ]
%arrayidx = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 %j.0
store i16 2, i16* %arrayidx, align 1
%inc = add nuw nsw i16 %j.0, 1
%exitcond = icmp eq i16 %j.0, 4
br i1 %exitcond, label %outerl, label %A
outerl:
store i16 1, i16* %arrayidx, align 1
%incx = add nuw nsw i16 %x, 1
%exitcondx = icmp eq i16 %x, 4
br i1 %exitcondx, label %end, label %outer
end:
ret i16 0
}
define i16 @multi_overwrite(i1 %cond) {
; CHECK-LABEL: @multi_overwrite(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[DO_BODY:%.*]]
; CHECK: do.body:
; CHECK-NEXT: [[I_0:%.*]] = phi i16 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[IF_END2:%.*]] ]
; CHECK-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 [[I_0]]
; CHECK-NEXT: store i16 2, i16* [[ARRAYIDX2]], align 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i16 [[I_0]], 4
; CHECK-NEXT: br i1 [[EXITCOND]], label [[EXIT:%.*]], label [[IF_END:%.*]]
; CHECK: if.end:
; CHECK-NEXT: br i1 [[COND:%.*]], label [[DO_STORE:%.*]], label [[IF_END2]]
; CHECK: do.store:
; CHECK-NEXT: store i16 3, i16* [[ARRAYIDX2]], align 1
; CHECK-NEXT: br label [[IF_END2]]
; CHECK: if.end2:
; CHECK-NEXT: [[INC]] = add nuw nsw i16 [[I_0]], 1
; CHECK-NEXT: br label [[DO_BODY]]
; CHECK: exit:
; CHECK-NEXT: store i16 1, i16* [[ARRAYIDX2]], align 1
; CHECK-NEXT: ret i16 0
;
entry:
br label %do.body
do.body:
%i.0 = phi i16 [ 0, %entry ], [ %inc, %if.end2 ]
%arrayidx2 = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 %i.0
store i16 2, i16* %arrayidx2, align 1
%exitcond = icmp eq i16 %i.0, 4
br i1 %exitcond, label %exit, label %if.end
if.end:
br i1 %cond, label %do.store, label %if.end2
do.store:
store i16 3, i16* %arrayidx2, align 1
br label %if.end2
if.end2:
%inc = add nuw nsw i16 %i.0, 1
br label %do.body
exit:
store i16 1, i16* %arrayidx2, align 1
ret i16 0
}
define void @test(i8* noalias %data1, i8* %data2, i16* %data3, i32 %i1)
; CHECK-LABEL: @test(
; CHECK-NEXT: [[C:%.*]] = icmp eq i32 [[I1:%.*]], 0
; CHECK-NEXT: br label [[PH0:%.*]]
; CHECK: ph0:
; CHECK-NEXT: br label [[HEADER0:%.*]]
; CHECK: header0:
; CHECK-NEXT: [[P1:%.*]] = phi i32 [ 0, [[PH0]] ], [ [[PN1:%.*]], [[END1:%.*]] ]
; CHECK-NEXT: [[PN1]] = add i32 [[P1]], 1
; CHECK-NEXT: [[PC1:%.*]] = icmp slt i32 [[PN1]], 5
; CHECK-NEXT: [[V2:%.*]] = getelementptr [10 x i16], [10 x i16]* @x, i32 0, i32 [[P1]]
; CHECK-NEXT: store i16 1, i16* [[V2]], align 2
; CHECK-NEXT: br i1 [[C]], label [[THEN1:%.*]], label [[ELSE1:%.*]]
; CHECK: then1:
; CHECK-NEXT: store i16 2, i16* [[V2]], align 2
; CHECK-NEXT: br label [[END1]]
; CHECK: else1:
; CHECK-NEXT: br label [[END1]]
; CHECK: end1:
; CHECK-NEXT: br i1 [[PC1]], label [[HEADER0]], label [[END0:%.*]]
; CHECK: end0:
; CHECK-NEXT: br label [[HEADER2:%.*]]
; CHECK: header2:
; CHECK-NEXT: [[P3:%.*]] = phi i32 [ 0, [[END0]] ], [ [[PN3:%.*]], [[HEADER2]] ]
; CHECK-NEXT: [[PN3]] = add i32 [[P3]], 1
; CHECK-NEXT: [[PC3:%.*]] = icmp slt i32 [[PN3]], 5
; CHECK-NEXT: store i16 4, i16* [[V2]], align 2
; CHECK-NEXT: br i1 [[PC3]], label [[HEADER2]], label [[END2:%.*]]
; CHECK: end2:
; CHECK-NEXT: ret void
;
{
%c = icmp eq i32 %i1, 0
br label %ph0
ph0:
br label %header0
header0:
%p1 = phi i32 [0, %ph0], [%pn1, %end1]
%pn1 = add i32 %p1, 1
%pc1 = icmp slt i32 %pn1, 5
%v2 = getelementptr [10 x i16], [10 x i16]* @x, i32 0, i32 %p1
store i16 1, i16* %v2
br i1 %c, label %then1, label %else1
then1:
store i16 2, i16* %v2
br label %end1
else1:
br label %end1
end1:
br i1 %pc1, label %header0, label %end0
end0:
br label %header2
header2:
%p3 = phi i32 [0, %end0], [%pn3, %header2]
%pn3 = add i32 %p3, 1
%pc3 = icmp slt i32 %pn3, 5
store i16 4, i16* %v2
br i1 %pc3, label %header2, label %end2
end2:
ret void
}
; Similar to above, but with multiple partial overlaps
define i16 @partial_override_fromloop(i1 %c, i32 %i) {
; CHECK-LABEL: @partial_override_fromloop(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[DO_BODY:%.*]]
; CHECK: do.body:
; CHECK-NEXT: [[I_0:%.*]] = phi i16 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[IF_END2:%.*]] ]
; CHECK-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 [[I_0]]
; CHECK-NEXT: store i16 2, i16* [[ARRAYIDX2]], align 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i16 [[I_0]], 4
; CHECK-NEXT: br i1 [[EXITCOND]], label [[EXIT:%.*]], label [[IF_END:%.*]]
; CHECK: if.end:
; CHECK-NEXT: br i1 [[C:%.*]], label [[DO_STORE:%.*]], label [[IF_END2]]
; CHECK: do.store:
; CHECK-NEXT: store i16 3, i16* [[ARRAYIDX2]], align 1
; CHECK-NEXT: br label [[IF_END2]]
; CHECK: if.end2:
; CHECK-NEXT: [[INC]] = add nuw nsw i16 [[I_0]], 1
; CHECK-NEXT: br label [[DO_BODY]]
; CHECK: exit:
; CHECK-NEXT: [[BC:%.*]] = bitcast i16* [[ARRAYIDX2]] to i8*
; CHECK-NEXT: [[BC2:%.*]] = getelementptr inbounds i8, i8* [[BC]], i32 1
; CHECK-NEXT: store i8 10, i8* [[BC]], align 1
; CHECK-NEXT: store i8 11, i8* [[BC2]], align 1
; CHECK-NEXT: ret i16 0
;
entry:
br label %do.body
do.body:
%i.0 = phi i16 [ 0, %entry ], [ %inc, %if.end2 ]
%arrayidx2 = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 %i.0
store i16 2, i16* %arrayidx2, align 1
%exitcond = icmp eq i16 %i.0, 4
br i1 %exitcond, label %exit, label %if.end
if.end:
br i1 %c, label %do.store, label %if.end2
do.store:
store i16 3, i16* %arrayidx2, align 1
br label %if.end2
if.end2:
%inc = add nuw nsw i16 %i.0, 1
br label %do.body
exit:
%bc = bitcast i16* %arrayidx2 to i8*
%bc2 = getelementptr inbounds i8, i8* %bc, i32 1
store i8 10, i8* %bc, align 1
store i8 11, i8* %bc2, align 1
ret i16 0
}
define i16 @partial_override_overloop(i1 %c, i32 %i) {
; CHECK-LABEL: @partial_override_overloop(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FIRST:%.*]]
; CHECK: first:
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i32 [[I:%.*]]
; CHECK-NEXT: store i16 1, i16* [[ARRAYIDX]], align 1
; CHECK-NEXT: br label [[DO_BODY:%.*]]
; CHECK: do.body:
; CHECK-NEXT: [[I_0:%.*]] = phi i16 [ 0, [[FIRST]] ], [ [[INC:%.*]], [[DO_BODY]] ]
; CHECK-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 [[I_0]]
; CHECK-NEXT: store i16 2, i16* [[ARRAYIDX2]], align 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i16 [[I_0]], 4
; CHECK-NEXT: [[INC]] = add nuw nsw i16 [[I_0]], 1
; CHECK-NEXT: br i1 [[EXITCOND]], label [[EXIT:%.*]], label [[DO_BODY]]
; CHECK: exit:
; CHECK-NEXT: [[BC:%.*]] = bitcast i16* [[ARRAYIDX]] to i8*
; CHECK-NEXT: [[BC2:%.*]] = getelementptr inbounds i8, i8* [[BC]], i32 1
; CHECK-NEXT: store i8 10, i8* [[BC]], align 1
; CHECK-NEXT: store i8 11, i8* [[BC2]], align 1
; CHECK-NEXT: ret i16 0
;
entry:
; Branch to first so MemoryLoc is not in the entry block.
br label %first
first:
%arrayidx = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i32 %i
store i16 1, i16* %arrayidx, align 1
br label %do.body
do.body:
%i.0 = phi i16 [ 0, %first ], [ %inc, %do.body ]
%arrayidx2 = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 %i.0
store i16 2, i16* %arrayidx2, align 1
%exitcond = icmp eq i16 %i.0, 4
%inc = add nuw nsw i16 %i.0, 1
br i1 %exitcond, label %exit, label %do.body
exit:
%bc = bitcast i16* %arrayidx to i8*
%bc2 = getelementptr inbounds i8, i8* %bc, i32 1
store i8 10, i8* %bc, align 1
store i8 11, i8* %bc2, align 1
ret i16 0
}
define i16 @partial_override_multi(i1 %c, i32 %i) {
; CHECK-LABEL: @partial_override_multi(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[DO_BODY:%.*]]
; CHECK: do.body:
; CHECK-NEXT: [[I_0:%.*]] = phi i16 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[DO_BODY]] ]
; CHECK-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 [[I_0]]
; CHECK-NEXT: store i16 10, i16* [[ARRAYIDX2]], align 1
; CHECK-NEXT: [[BC:%.*]] = bitcast i16* [[ARRAYIDX2]] to i8*
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i16 [[I_0]], 4
; CHECK-NEXT: [[INC]] = add nuw nsw i16 [[I_0]], 1
; CHECK-NEXT: br i1 [[EXITCOND]], label [[EXIT:%.*]], label [[DO_BODY]]
; CHECK: exit:
; CHECK-NEXT: [[BC2:%.*]] = getelementptr inbounds i8, i8* [[BC]], i32 1
; CHECK-NEXT: store i8 11, i8* [[BC2]], align 1
; CHECK-NEXT: ret i16 0
;
entry:
br label %do.body
do.body:
%i.0 = phi i16 [ 0, %entry ], [ %inc, %do.body ]
%arrayidx2 = getelementptr inbounds [10 x i16], [10 x i16]* @x, i16 0, i16 %i.0
store i16 2, i16* %arrayidx2, align 1
%bc = bitcast i16* %arrayidx2 to i8*
store i8 10, i8* %bc, align 1
%exitcond = icmp eq i16 %i.0, 4
%inc = add nuw nsw i16 %i.0, 1
br i1 %exitcond, label %exit, label %do.body
exit:
%bc2 = getelementptr inbounds i8, i8* %bc, i32 1
store i8 11, i8* %bc2, align 1
ret i16 0
}
define void @InitializeMasks(i64* %p) {
; CHECK-LABEL: @InitializeMasks(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_BODY98:%.*]]
; CHECK: for.body98:
; CHECK-NEXT: [[INDVARS_IV377:%.*]] = phi i64 [ 8, [[ENTRY:%.*]] ], [ [[INC2:%.*]], [[FOR_INC140:%.*]] ], [ [[INC1:%.*]], [[FOR_INC140_THREAD:%.*]] ]
; CHECK-NEXT: [[ARRAYIDX106:%.*]] = getelementptr inbounds i64, i64* [[P:%.*]], i64 [[INDVARS_IV377]]
; CHECK-NEXT: store i64 1, i64* [[ARRAYIDX106]], align 8
; CHECK-NEXT: [[CMP107:%.*]] = icmp ugt i64 [[INDVARS_IV377]], 15
; CHECK-NEXT: br i1 [[CMP107]], label [[IF_END:%.*]], label [[IF_END_THREAD:%.*]]
; CHECK: if.end.thread:
; CHECK-NEXT: br label [[FOR_INC140_THREAD]]
; CHECK: if.end:
; CHECK-NEXT: store i64 2, i64* [[ARRAYIDX106]], align 8
; CHECK-NEXT: [[CMP127:%.*]] = icmp ult i64 [[INDVARS_IV377]], 48
; CHECK-NEXT: br i1 [[CMP127]], label [[FOR_INC140_THREAD]], label [[FOR_INC140]]
; CHECK: for.inc140.thread:
; CHECK-NEXT: [[INC1]] = add i64 [[INDVARS_IV377]], 1
; CHECK-NEXT: br label [[FOR_BODY98]]
; CHECK: for.inc140:
; CHECK-NEXT: [[INC2]] = add i64 [[INDVARS_IV377]], 1
; CHECK-NEXT: [[EXITCOND384_NOT:%.*]] = icmp eq i64 [[INDVARS_IV377]], 56
; CHECK-NEXT: br i1 [[EXITCOND384_NOT]], label [[FOR_INC177:%.*]], label [[FOR_BODY98]]
; CHECK: for.inc177:
; CHECK-NEXT: ret void
;
entry:
br label %for.body98
for.body98: ; preds = %for.inc140, %for.inc140.thread, %entry
%indvars.iv377 = phi i64 [ 8, %entry ], [ %inc2, %for.inc140 ], [ %inc1, %for.inc140.thread ]
%arrayidx106 = getelementptr inbounds i64, i64* %p, i64 %indvars.iv377
store i64 1, i64* %arrayidx106, align 8
%cmp107 = icmp ugt i64 %indvars.iv377, 15
br i1 %cmp107, label %if.end, label %if.end.thread
if.end.thread: ; preds = %for.body98
br label %for.inc140.thread
if.end: ; preds = %for.body98
store i64 2, i64* %arrayidx106, align 8
%cmp127 = icmp ult i64 %indvars.iv377, 48
br i1 %cmp127, label %for.inc140.thread, label %for.inc140
for.inc140.thread: ; preds = %if.end, %if.end.thread
%inc1 = add i64 %indvars.iv377, 1
br label %for.body98
for.inc140: ; preds = %if.end
%inc2 = add i64 %indvars.iv377, 1
%exitcond384.not = icmp eq i64 %indvars.iv377, 56
br i1 %exitcond384.not, label %for.inc177, label %for.body98
for.inc177: ; preds = %for.inc140
ret void
}
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