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llvm-mirror/test/Transforms/InstCombine/phi.ll
Serguei Katkov fcb17e5e03 [IsKnownNonZero] Handle the case with non-constant phi nodes 
Handle the case when all inputs of phi are proven to be non zero.

Constants are checked in beginning of this method before check for depth of recursion,
so it is a partial case of non-constant phi.

Recursion depth is already handled by the function.

Reviewers: aqjune, nikic, efriedma
Reviewed By: nikic
Subscribers: dantrushin, hiraditya, jdoerfert, llvm-commits
Differential Revision: https://reviews.llvm.org/D88276
2020-09-29 15:22:10 +07:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128:n8:16:32:64"
define i32 @test1(i32 %A, i1 %b) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: BB0:
; CHECK-NEXT: br i1 [[B:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: BB1:
; CHECK-NEXT: ret i32 [[A:%.*]]
; CHECK: BB2:
; CHECK-NEXT: ret i32 [[A]]
;
BB0:
br i1 %b, label %BB1, label %BB2
BB1:
; Combine away one argument PHI nodes
%B = phi i32 [ %A, %BB0 ]
ret i32 %B
BB2:
ret i32 %A
}
define i32 @test2(i32 %A, i1 %b) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: BB0:
; CHECK-NEXT: br i1 [[B:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: BB1:
; CHECK-NEXT: br label [[BB2]]
; CHECK: BB2:
; CHECK-NEXT: ret i32 [[A:%.*]]
;
BB0:
br i1 %b, label %BB1, label %BB2
BB1:
br label %BB2
BB2:
; Combine away PHI nodes with same values
%B = phi i32 [ %A, %BB0 ], [ %A, %BB1 ]
ret i32 %B
}
define i32 @test3(i32 %A, i1 %b) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: BB0:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: Loop:
; CHECK-NEXT: br i1 [[B:%.*]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK: Exit:
; CHECK-NEXT: ret i32 [[A:%.*]]
;
BB0:
br label %Loop
Loop:
; PHI has same value always.
%B = phi i32 [ %A, %BB0 ], [ %B, %Loop ]
br i1 %b, label %Loop, label %Exit
Exit:
ret i32 %B
}
define i32 @test4(i1 %b) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: BB0:
; CHECK-NEXT: ret i32 7
; CHECK: Loop:
; CHECK-NEXT: br i1 [[B:%.*]], label [[L2:%.*]], label [[LOOP:%.*]]
; CHECK: L2:
; CHECK-NEXT: br label [[LOOP]]
;
BB0:
; Loop is unreachable
ret i32 7
Loop: ; preds = %L2, %Loop
; PHI has same value always.
%B = phi i32 [ %B, %L2 ], [ %B, %Loop ]
br i1 %b, label %L2, label %Loop
L2: ; preds = %Loop
br label %Loop
}
define i32 @test5(i32 %A, i1 %b) {
; CHECK-LABEL: @test5(
; CHECK-NEXT: BB0:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: Loop:
; CHECK-NEXT: br i1 [[B:%.*]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK: Exit:
; CHECK-NEXT: ret i32 [[A:%.*]]
;
BB0:
br label %Loop
Loop: ; preds = %Loop, %BB0
; PHI has same value always.
%B = phi i32 [ %A, %BB0 ], [ undef, %Loop ]
br i1 %b, label %Loop, label %Exit
Exit: ; preds = %Loop
ret i32 %B
}
define i32 @test6(i16 %A, i1 %b) {
; CHECK-LABEL: @test6(
; CHECK-NEXT: BB0:
; CHECK-NEXT: br i1 [[B:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: BB1:
; CHECK-NEXT: br label [[BB2]]
; CHECK: BB2:
; CHECK-NEXT: [[B:%.*]] = zext i16 [[A:%.*]] to i32
; CHECK-NEXT: ret i32 [[B]]
;
BB0:
%X = zext i16 %A to i32
br i1 %b, label %BB1, label %BB2
BB1:
%Y = zext i16 %A to i32
br label %BB2
BB2:
;; Suck casts into phi
%B = phi i32 [ %X, %BB0 ], [ %Y, %BB1 ]
ret i32 %B
}
define i32 @test7(i32 %A, i1 %b) {
; CHECK-LABEL: @test7(
; CHECK-NEXT: BB0:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: Loop:
; CHECK-NEXT: br i1 [[B:%.*]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK: Exit:
; CHECK-NEXT: ret i32 0
;
BB0:
br label %Loop
Loop: ; preds = %Loop, %BB0
; PHI is dead.
%B = phi i32 [ %A, %BB0 ], [ %C, %Loop ]
%C = add i32 %B, 123
br i1 %b, label %Loop, label %Exit
Exit: ; preds = %Loop
ret i32 0
}
define i32* @test8({ i32, i32 } *%A, i1 %b) {
; CHECK-LABEL: @test8(
; CHECK-NEXT: BB0:
; CHECK-NEXT: br i1 [[B:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: BB1:
; CHECK-NEXT: br label [[BB2]]
; CHECK: BB2:
; CHECK-NEXT: [[B:%.*]] = getelementptr { i32, i32 }, { i32, i32 }* [[A:%.*]], i64 0, i32 1
; CHECK-NEXT: ret i32* [[B]]
;
BB0:
%X = getelementptr inbounds { i32, i32 }, { i32, i32 } *%A, i32 0, i32 1
br i1 %b, label %BB1, label %BB2
BB1:
%Y = getelementptr { i32, i32 }, { i32, i32 } *%A, i32 0, i32 1
br label %BB2
BB2:
;; Suck GEPs into phi
%B = phi i32* [ %X, %BB0 ], [ %Y, %BB1 ]
ret i32* %B
}
define i32 @test9(i32* %A, i32* %B) {
; CHECK-LABEL: @test9(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[C:%.*]] = icmp eq i32* [[A:%.*]], null
; CHECK-NEXT: br i1 [[C]], label [[BB1:%.*]], label [[BB:%.*]]
; CHECK: bb:
; CHECK-NEXT: br label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: br label [[BB2]]
; CHECK: bb2:
; CHECK-NEXT: [[E_IN:%.*]] = phi i32* [ [[B:%.*]], [[BB]] ], [ [[A]], [[BB1]] ]
; CHECK-NEXT: [[E:%.*]] = load i32, i32* [[E_IN]], align 1
; CHECK-NEXT: ret i32 [[E]]
;
entry:
%c = icmp eq i32* %A, null
br i1 %c, label %bb1, label %bb
bb:
%C = load i32, i32* %B, align 1
br label %bb2
bb1:
%D = load i32, i32* %A, align 1
br label %bb2
bb2:
%E = phi i32 [ %C, %bb ], [ %D, %bb1 ]
ret i32 %E
}
define i32 @test10(i32* %A, i32* %B) {
; CHECK-LABEL: @test10(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[C:%.*]] = icmp eq i32* [[A:%.*]], null
; CHECK-NEXT: br i1 [[C]], label [[BB1:%.*]], label [[BB:%.*]]
; CHECK: bb:
; CHECK-NEXT: br label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: br label [[BB2]]
; CHECK: bb2:
; CHECK-NEXT: [[E_IN:%.*]] = phi i32* [ [[B:%.*]], [[BB]] ], [ [[A]], [[BB1]] ]
; CHECK-NEXT: [[E:%.*]] = load i32, i32* [[E_IN]], align 16
; CHECK-NEXT: ret i32 [[E]]
;
entry:
%c = icmp eq i32* %A, null
br i1 %c, label %bb1, label %bb
bb:
%C = load i32, i32* %B, align 16
br label %bb2
bb1:
%D = load i32, i32* %A, align 32
br label %bb2
bb2:
%E = phi i32 [ %C, %bb ], [ %D, %bb1 ]
ret i32 %E
}
; PR1777
declare i1 @test11a()
define i1 @test11() {
; CHECK-LABEL: @test11(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B:%.*]] = call i1 @test11a()
; CHECK-NEXT: br i1 [[B]], label [[ONE:%.*]], label [[TWO:%.*]]
; CHECK: one:
; CHECK-NEXT: [[C:%.*]] = call i1 @test11a()
; CHECK-NEXT: br i1 [[C]], label [[TWO]], label [[END:%.*]]
; CHECK: two:
; CHECK-NEXT: [[D:%.*]] = call i1 @test11a()
; CHECK-NEXT: br i1 [[D]], label [[ONE]], label [[END]]
; CHECK: end:
; CHECK-NEXT: [[Z:%.*]] = call i1 @test11a()
; CHECK-NEXT: ret i1 [[Z]]
;
entry:
%a = alloca i32
%i = ptrtoint i32* %a to i64
%b = call i1 @test11a()
br i1 %b, label %one, label %two
one:
%x = phi i64 [%i, %entry], [%y, %two]
%c = call i1 @test11a()
br i1 %c, label %two, label %end
two:
%y = phi i64 [%i, %entry], [%x, %one]
%d = call i1 @test11a()
br i1 %d, label %one, label %end
end:
%f = phi i64 [ %x, %one], [%y, %two]
; Change the %f to %i, and the optimizer suddenly becomes a lot smarter
; even though %f must equal %i at this point
%g = inttoptr i64 %f to i32*
store i32 10, i32* %g
%z = call i1 @test11a()
ret i1 %z
}
define i64 @test12(i1 %cond, i8* %Ptr, i64 %Val) {
; CHECK-LABEL: @test12(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[COND:%.*]], label [[END:%.*]], label [[TWO:%.*]]
; CHECK: two:
; CHECK-NEXT: br label [[END]]
; CHECK: end:
; CHECK-NEXT: [[T869_0_OFF64:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[VAL:%.*]], [[TWO]] ]
; CHECK-NEXT: [[T41:%.*]] = ptrtoint i8* [[PTR:%.*]] to i64
; CHECK-NEXT: [[T2:%.*]] = add i64 [[T869_0_OFF64]], [[T41]]
; CHECK-NEXT: ret i64 [[T2]]
;
entry:
%t41 = ptrtoint i8* %Ptr to i64
%t42 = zext i64 %t41 to i128
br i1 %cond, label %end, label %two
two:
%t36 = zext i64 %Val to i128 ; <i128> [#uses=1]
%t37 = shl i128 %t36, 64 ; <i128> [#uses=1]
%ins39 = or i128 %t42, %t37 ; <i128> [#uses=1]
br label %end
end:
%t869.0 = phi i128 [ %t42, %entry ], [ %ins39, %two ]
%t32 = trunc i128 %t869.0 to i64 ; <i64> [#uses=1]
%t29 = lshr i128 %t869.0, 64 ; <i128> [#uses=1]
%t30 = trunc i128 %t29 to i64 ; <i64> [#uses=1]
%t2 = add i64 %t32, %t30
ret i64 %t2
}
declare void @test13f(double, i32)
define void @test13(i1 %cond, i32 %V1, double %Vald) {
; CHECK-LABEL: @test13(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[COND:%.*]], label [[END:%.*]], label [[TWO:%.*]]
; CHECK: two:
; CHECK-NEXT: br label [[END]]
; CHECK: end:
; CHECK-NEXT: [[TMP0:%.*]] = phi double [ 0.000000e+00, [[ENTRY:%.*]] ], [ [[VALD:%.*]], [[TWO]] ]
; CHECK-NEXT: call void @test13f(double [[TMP0]], i32 [[V1:%.*]])
; CHECK-NEXT: ret void
;
entry:
%t42 = zext i32 %V1 to i128
br i1 %cond, label %end, label %two
two:
%Val = bitcast double %Vald to i64
%t36 = zext i64 %Val to i128 ; <i128> [#uses=1]
%t37 = shl i128 %t36, 64 ; <i128> [#uses=1]
%ins39 = or i128 %t42, %t37 ; <i128> [#uses=1]
br label %end
end:
%t869.0 = phi i128 [ %t42, %entry ], [ %ins39, %two ]
%t32 = trunc i128 %t869.0 to i32
%t29 = lshr i128 %t869.0, 64 ; <i128> [#uses=1]
%t30 = trunc i128 %t29 to i64 ; <i64> [#uses=1]
%t31 = bitcast i64 %t30 to double
call void @test13f(double %t31, i32 %t32)
ret void
}
define i640 @test14a(i320 %A, i320 %B, i1 %b1) {
; CHECK-LABEL: @test14a(
; CHECK-NEXT: BB0:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: Loop:
; CHECK-NEXT: [[C_IN:%.*]] = phi i320 [ [[A:%.*]], [[BB0:%.*]] ], [ [[B:%.*]], [[LOOP]] ]
; CHECK-NEXT: br i1 [[B1:%.*]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK: Exit:
; CHECK-NEXT: [[C:%.*]] = zext i320 [[C_IN]] to i640
; CHECK-NEXT: ret i640 [[C]]
;
BB0:
%a = zext i320 %A to i640
%b = zext i320 %B to i640
br label %Loop
Loop:
%C = phi i640 [ %a, %BB0 ], [ %b, %Loop ]
br i1 %b1, label %Loop, label %Exit
Exit: ; preds = %Loop
ret i640 %C
}
define i160 @test14b(i320 %pA, i320 %pB, i1 %b1) {
; CHECK-LABEL: @test14b(
; CHECK-NEXT: BB0:
; CHECK-NEXT: [[A:%.*]] = trunc i320 [[PA:%.*]] to i160
; CHECK-NEXT: [[B:%.*]] = trunc i320 [[PB:%.*]] to i160
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: Loop:
; CHECK-NEXT: [[C:%.*]] = phi i160 [ [[A]], [[BB0:%.*]] ], [ [[B]], [[LOOP]] ]
; CHECK-NEXT: br i1 [[B1:%.*]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK: Exit:
; CHECK-NEXT: ret i160 [[C]]
;
BB0:
%a = trunc i320 %pA to i160
%b = trunc i320 %pB to i160
br label %Loop
Loop:
%C = phi i160 [ %a, %BB0 ], [ %b, %Loop ]
br i1 %b1, label %Loop, label %Exit
Exit: ; preds = %Loop
ret i160 %C
}
declare i64 @test15a(i64)
define i64 @test15b(i64 %A, i1 %b) {
; CHECK-LABEL: @test15b(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[B:%.*]], label [[ONE:%.*]], label [[TWO:%.*]]
; CHECK: one:
; CHECK-NEXT: [[X_OFF64:%.*]] = phi i64 [ [[A:%.*]], [[ENTRY:%.*]] ], [ [[Y_OFF64:%.*]], [[TWO]] ]
; CHECK-NEXT: [[C:%.*]] = call i64 @test15a(i64 [[X_OFF64]])
; CHECK-NEXT: br label [[TWO]]
; CHECK: two:
; CHECK-NEXT: [[Y_OFF0:%.*]] = phi i64 [ [[A]], [[ENTRY]] ], [ [[C]], [[ONE]] ]
; CHECK-NEXT: [[Y_OFF64]] = phi i64 [ [[A]], [[ENTRY]] ], [ 0, [[ONE]] ]
; CHECK-NEXT: [[D:%.*]] = call i64 @test15a(i64 [[Y_OFF64]])
; CHECK-NEXT: [[TMP0:%.*]] = and i64 [[D]], 1
; CHECK-NEXT: [[D1_NOT:%.*]] = icmp eq i64 [[TMP0]], 0
; CHECK-NEXT: br i1 [[D1_NOT]], label [[END:%.*]], label [[ONE]]
; CHECK: end:
; CHECK-NEXT: ret i64 [[Y_OFF0]]
;
entry:
%i0 = zext i64 %A to i128
%i1 = shl i128 %i0, 64
%i = or i128 %i1, %i0
br i1 %b, label %one, label %two
one:
%x = phi i128 [%i, %entry], [%y, %two]
%x1 = lshr i128 %x, 64
%x2 = trunc i128 %x1 to i64
%c = call i64 @test15a(i64 %x2)
%c1 = zext i64 %c to i128
br label %two
two:
%y = phi i128 [%i, %entry], [%c1, %one]
%y1 = lshr i128 %y, 64
%y2 = trunc i128 %y1 to i64
%d = call i64 @test15a(i64 %y2)
%d1 = trunc i64 %d to i1
br i1 %d1, label %one, label %end
end:
%g = trunc i128 %y to i64
ret i64 %g
}
; PR6512 - Shouldn't merge loads from different addr spaces.
define i32 @test16(i32 addrspace(1)* %pointer1, i32 %flag, i32* %pointer2)
; CHECK-LABEL: @test16(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[RETVAL:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[POINTER1_ADDR:%.*]] = alloca i32 addrspace(1)*, align 8
; CHECK-NEXT: [[POINTER2_ADDR:%.*]] = alloca i32*, align 8
; CHECK-NEXT: store i32 addrspace(1)* [[POINTER1:%.*]], i32 addrspace(1)** [[POINTER1_ADDR]], align 8
; CHECK-NEXT: store i32* [[POINTER2:%.*]], i32** [[POINTER2_ADDR]], align 8
; CHECK-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[FLAG:%.*]], 0
; CHECK-NEXT: br i1 [[TOBOOL_NOT]], label [[IF_ELSE:%.*]], label [[IF_THEN:%.*]]
; CHECK: return:
; CHECK-NEXT: [[T7:%.*]] = load i32, i32* [[RETVAL]], align 4
; CHECK-NEXT: ret i32 [[T7]]
; CHECK: if.end:
; CHECK-NEXT: [[STOREMERGE:%.*]] = phi i32 [ [[T5:%.*]], [[IF_ELSE]] ], [ [[T2:%.*]], [[IF_THEN]] ]
; CHECK-NEXT: store i32 [[STOREMERGE]], i32* [[RETVAL]], align 4
; CHECK-NEXT: br label [[RETURN:%.*]]
; CHECK: if.then:
; CHECK-NEXT: [[T1:%.*]] = load i32 addrspace(1)*, i32 addrspace(1)** [[POINTER1_ADDR]], align 8
; CHECK-NEXT: [[T2]] = load i32, i32 addrspace(1)* [[T1]], align 4
; CHECK-NEXT: br label [[IF_END:%.*]]
; CHECK: if.else:
; CHECK-NEXT: [[T3:%.*]] = load i32*, i32** [[POINTER2_ADDR]], align 8
; CHECK-NEXT: [[T5]] = load i32, i32* [[T3]], align 4
; CHECK-NEXT: br label [[IF_END]]
;
nounwind {
entry:
%retval = alloca i32, align 4 ; <i32*> [#uses=2]
%pointer1.addr = alloca i32 addrspace(1)*, align 4 ; <i32 addrspace(1)**>
%flag.addr = alloca i32, align 4 ; <i32*> [#uses=2]
%pointer2.addr = alloca i32*, align 4 ; <i32**> [#uses=2]
%res = alloca i32, align 4 ; <i32*> [#uses=4]
store i32 addrspace(1)* %pointer1, i32 addrspace(1)** %pointer1.addr
store i32 %flag, i32* %flag.addr
store i32* %pointer2, i32** %pointer2.addr
store i32 10, i32* %res
%t = load i32, i32* %flag.addr ; <i32> [#uses=1]
%tobool = icmp ne i32 %t, 0 ; <i1> [#uses=1]
br i1 %tobool, label %if.then, label %if.else
return: ; preds = %if.end
%t7 = load i32, i32* %retval ; <i32> [#uses=1]
ret i32 %t7
if.end: ; preds = %if.else, %if.then
%t6 = load i32, i32* %res ; <i32> [#uses=1]
store i32 %t6, i32* %retval
br label %return
if.then: ; preds = %entry
%t1 = load i32 addrspace(1)*, i32 addrspace(1)** %pointer1.addr ; <i32 addrspace(1)*>
%arrayidx = getelementptr i32, i32 addrspace(1)* %t1, i32 0 ; <i32 addrspace(1)*> [#uses=1]
%t2 = load i32, i32 addrspace(1)* %arrayidx ; <i32> [#uses=1]
store i32 %t2, i32* %res
br label %if.end
if.else: ; preds = %entry
%t3 = load i32*, i32** %pointer2.addr ; <i32*> [#uses=1]
%arrayidx4 = getelementptr i32, i32* %t3, i32 0 ; <i32*> [#uses=1]
%t5 = load i32, i32* %arrayidx4 ; <i32> [#uses=1]
store i32 %t5, i32* %res
br label %if.end
}
; PR4413
declare i32 @ext()
define i32 @test17(i1 %a) {
; CHECK-LABEL: @test17(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[A:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[TMP0:%.*]] = tail call i32 @ext()
; CHECK-NEXT: br label [[BB2]]
; CHECK: bb2:
; CHECK-NEXT: [[RES:%.*]] = phi i32 [ [[TMP0]], [[BB1]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: ret i32 [[RES]]
;
entry:
br i1 %a, label %bb1, label %bb2
bb1: ; preds = %entry
%0 = tail call i32 @ext() ; <i32> [#uses=1]
br label %bb2
bb2: ; preds = %bb1, %entry
%cond = phi i1 [ true, %bb1 ], [ false, %entry ] ; <i1> [#uses=1]
%val = phi i32 [ %0, %bb1 ], [ 0, %entry ] ; <i32> [#uses=1]
%res = select i1 %cond, i32 %val, i32 0 ; <i32> [#uses=1]
ret i32 %res
}
define i1 @test18(i1 %cond) {
; CHECK-LABEL: @test18(
; CHECK-NEXT: br i1 [[COND:%.*]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; CHECK: true:
; CHECK-NEXT: br label [[RET:%.*]]
; CHECK: false:
; CHECK-NEXT: br label [[RET]]
; CHECK: ret:
; CHECK-NEXT: ret i1 false
;
%zero = alloca i32
%one = alloca i32
br i1 %cond, label %true, label %false
true:
br label %ret
false:
br label %ret
ret:
%ptr = phi i32* [ %zero, %true ] , [ %one, %false ]
%isnull = icmp eq i32* %ptr, null
ret i1 %isnull
}
define i1 @test19(i1 %cond, double %x) {
; CHECK-LABEL: @test19(
; CHECK-NEXT: br i1 [[COND:%.*]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; CHECK: true:
; CHECK-NEXT: br label [[RET:%.*]]
; CHECK: false:
; CHECK-NEXT: br label [[RET]]
; CHECK: ret:
; CHECK-NEXT: ret i1 true
;
br i1 %cond, label %true, label %false
true:
br label %ret
false:
br label %ret
ret:
%p = phi double [ %x, %true ], [ 0x7FF0000000000000, %false ]; RHS = +infty
%cmp = fcmp ule double %x, %p
ret i1 %cmp
}
define i1 @test20(i1 %cond) {
; CHECK-LABEL: @test20(
; CHECK-NEXT: br i1 [[COND:%.*]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; CHECK: true:
; CHECK-NEXT: br label [[RET:%.*]]
; CHECK: false:
; CHECK-NEXT: br label [[RET]]
; CHECK: ret:
; CHECK-NEXT: ret i1 false
;
%a = alloca i32
%b = alloca i32
%c = alloca i32
br i1 %cond, label %true, label %false
true:
br label %ret
false:
br label %ret
ret:
%p = phi i32* [ %a, %true ], [ %b, %false ]
%r = icmp eq i32* %p, %c
ret i1 %r
}
define i1 @test21(i1 %c1, i1 %c2) {
; CHECK-LABEL: @test21(
; CHECK-NEXT: br i1 [[C1:%.*]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; CHECK: true:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: false:
; CHECK-NEXT: br label [[LOOP]]
; CHECK: loop:
; CHECK-NEXT: br i1 [[C2:%.*]], label [[RET:%.*]], label [[LOOP]]
; CHECK: ret:
; CHECK-NEXT: ret i1 false
;
%a = alloca i32
%b = alloca i32
%c = alloca i32
br i1 %c1, label %true, label %false
true:
br label %loop
false:
br label %loop
loop:
%p = phi i32* [ %a, %true ], [ %b, %false ], [ %p, %loop ]
%r = icmp eq i32* %p, %c
br i1 %c2, label %ret, label %loop
ret:
ret i1 %r
}
define void @test22() {
; CHECK-LABEL: @test22(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[PHI:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[Y:%.*]], [[LOOP]] ]
; CHECK-NEXT: [[Y]] = add i32 [[PHI]], 1
; CHECK-NEXT: [[O:%.*]] = or i32 [[Y]], [[PHI]]
; CHECK-NEXT: [[E:%.*]] = icmp eq i32 [[O]], [[Y]]
; CHECK-NEXT: br i1 [[E]], label [[LOOP]], label [[RET:%.*]]
; CHECK: ret:
; CHECK-NEXT: ret void
;
entry:
br label %loop
loop:
%phi = phi i32 [ 0, %entry ], [ %y, %loop ]
%y = add i32 %phi, 1
%o = or i32 %y, %phi
%e = icmp eq i32 %o, %y
br i1 %e, label %loop, label %ret
ret:
ret void
}
define i32 @test23(i32 %A, i1 %pb, i32 * %P) {
; CHECK-LABEL: @test23(
; CHECK-NEXT: BB0:
; CHECK-NEXT: [[PHI_BO:%.*]] = add i32 [[A:%.*]], 19
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: Loop:
; CHECK-NEXT: [[B:%.*]] = phi i32 [ [[PHI_BO]], [[BB0:%.*]] ], [ 61, [[LOOP]] ]
; CHECK-NEXT: store i32 [[B]], i32* [[P:%.*]], align 4
; CHECK-NEXT: br i1 [[PB:%.*]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK: Exit:
; CHECK-NEXT: ret i32 [[B]]
;
BB0:
br label %Loop
Loop: ; preds = %Loop, %BB0
; PHI has same value always.
%B = phi i32 [ %A, %BB0 ], [ 42, %Loop ]
%D = add i32 %B, 19
store i32 %D, i32* %P
br i1 %pb, label %Loop, label %Exit
Exit: ; preds = %Loop
%E = add i32 %B, 19
ret i32 %E
}
define i32 @test24(i32 %A, i1 %cond) {
; CHECK-LABEL: @test24(
; CHECK-NEXT: BB0:
; CHECK-NEXT: br i1 [[COND:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: BB1:
; CHECK-NEXT: br label [[BB2]]
; CHECK: BB2:
; CHECK-NEXT: [[C:%.*]] = add nuw i32 [[A:%.*]], 1
; CHECK-NEXT: ret i32 [[C]]
;
BB0:
%X = add nuw nsw i32 %A, 1
br i1 %cond, label %BB1, label %BB2
BB1:
%Y = add nuw i32 %A, 1
br label %BB2
BB2:
%C = phi i32 [ %X, %BB0 ], [ %Y, %BB1 ]
ret i32 %C
}
; Same as test11, but used to be missed due to a bug.
declare i1 @test25a()
define i1 @test25() {
; CHECK-LABEL: @test25(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B:%.*]] = call i1 @test25a()
; CHECK-NEXT: br i1 [[B]], label [[ONE:%.*]], label [[TWO:%.*]]
; CHECK: one:
; CHECK-NEXT: [[C:%.*]] = call i1 @test25a()
; CHECK-NEXT: br i1 [[C]], label [[TWO]], label [[END:%.*]]
; CHECK: two:
; CHECK-NEXT: [[D:%.*]] = call i1 @test25a()
; CHECK-NEXT: br i1 [[D]], label [[ONE]], label [[END]]
; CHECK: end:
; CHECK-NEXT: [[Z:%.*]] = call i1 @test25a()
; CHECK-NEXT: ret i1 [[Z]]
;
entry:
%a = alloca i32
%i = ptrtoint i32* %a to i64
%b = call i1 @test25a()
br i1 %b, label %one, label %two
one:
%x = phi i64 [%y, %two], [%i, %entry]
%c = call i1 @test25a()
br i1 %c, label %two, label %end
two:
%y = phi i64 [%x, %one], [%i, %entry]
%d = call i1 @test25a()
br i1 %d, label %one, label %end
end:
%f = phi i64 [ %x, %one], [%y, %two]
; Change the %f to %i, and the optimizer suddenly becomes a lot smarter
; even though %f must equal %i at this point
%g = inttoptr i64 %f to i32*
store i32 10, i32* %g
%z = call i1 @test25a()
ret i1 %z
}
declare i1 @test26a()
define i1 @test26(i32 %n) {
; CHECK-LABEL: @test26(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B:%.*]] = call i1 @test26a()
; CHECK-NEXT: br label [[ONE:%.*]]
; CHECK: one:
; CHECK-NEXT: [[C:%.*]] = call i1 @test26a()
; CHECK-NEXT: switch i32 [[N:%.*]], label [[END:%.*]] [
; CHECK-NEXT: i32 2, label [[TWO:%.*]]
; CHECK-NEXT: i32 3, label [[THREE:%.*]]
; CHECK-NEXT: ]
; CHECK: two:
; CHECK-NEXT: [[D:%.*]] = call i1 @test26a()
; CHECK-NEXT: switch i32 [[N]], label [[END]] [
; CHECK-NEXT: i32 10, label [[ONE]]
; CHECK-NEXT: i32 30, label [[THREE]]
; CHECK-NEXT: ]
; CHECK: three:
; CHECK-NEXT: [[E:%.*]] = call i1 @test26a()
; CHECK-NEXT: br i1 [[E]], label [[ONE]], label [[TWO]]
; CHECK: end:
; CHECK-NEXT: [[Z:%.*]] = call i1 @test26a()
; CHECK-NEXT: ret i1 [[Z]]
;
entry:
%a = alloca i32
%i = ptrtoint i32* %a to i64
%b = call i1 @test26a()
br label %one
one:
%x = phi i64 [%y, %two], [%w, %three], [%i, %entry]
%c = call i1 @test26a()
switch i32 %n, label %end [
i32 2, label %two
i32 3, label %three
]
two:
%y = phi i64 [%x, %one], [%w, %three]
%d = call i1 @test26a()
switch i32 %n, label %end [
i32 10, label %one
i32 30, label %three
]
three:
%w = phi i64 [%y, %two], [%x, %one]
%e = call i1 @test26a()
br i1 %e, label %one, label %two
end:
%f = phi i64 [ %x, %one], [%y, %two]
; Change the %f to %i, and the optimizer suddenly becomes a lot smarter
; even though %f must equal %i at this point
%g = inttoptr i64 %f to i32*
store i32 10, i32* %g
%z = call i1 @test26a()
ret i1 %z
}
define i32 @test27(i1 %b) {
; CHECK-LABEL: @test27(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
; CHECK-NEXT: ret i32 undef
;
entry:
br label %done
done:
%y = phi i32 [ undef, %entry ]
ret i32 %y
}
; We should be able to fold the zexts to the other side of the phi
; even though there's a constant value input to the phi. This is
; because we can shrink that constant to the smaller phi type.
define i1 @PR24766(i8 %x1, i8 %x2, i8 %condition) {
; CHECK-LABEL: @PR24766(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CONV:%.*]] = sext i8 [[CONDITION:%.*]] to i32
; CHECK-NEXT: switch i32 [[CONV]], label [[EPILOG:%.*]] [
; CHECK-NEXT: i32 0, label [[SW1:%.*]]
; CHECK-NEXT: i32 1, label [[SW2:%.*]]
; CHECK-NEXT: ]
; CHECK: sw1:
; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i8 [[X1:%.*]], [[X2:%.*]]
; CHECK-NEXT: br label [[EPILOG]]
; CHECK: sw2:
; CHECK-NEXT: [[CMP2:%.*]] = icmp sle i8 [[X1]], [[X2]]
; CHECK-NEXT: br label [[EPILOG]]
; CHECK: epilog:
; CHECK-NEXT: [[CONDITIONMET_SHRUNK:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[CMP2]], [[SW2]] ], [ [[CMP1]], [[SW1]] ]
; CHECK-NEXT: ret i1 [[CONDITIONMET_SHRUNK]]
;
entry:
%conv = sext i8 %condition to i32
switch i32 %conv, label %epilog [
i32 0, label %sw1
i32 1, label %sw2
]
sw1:
%cmp1 = icmp eq i8 %x1, %x2
%frombool1 = zext i1 %cmp1 to i8
br label %epilog
sw2:
%cmp2 = icmp sle i8 %x1, %x2
%frombool2 = zext i1 %cmp2 to i8
br label %epilog
epilog:
%conditionMet = phi i8 [ 0, %entry ], [ %frombool2, %sw2 ], [ %frombool1, %sw1 ]
%tobool = icmp ne i8 %conditionMet, 0
ret i1 %tobool
}
; Same as above (a phi with more than 2 operands), but no constants
define i1 @PR24766_no_constants(i8 %x1, i8 %x2, i8 %condition, i1 %another_condition) {
; CHECK-LABEL: @PR24766_no_constants(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CONV:%.*]] = sext i8 [[CONDITION:%.*]] to i32
; CHECK-NEXT: switch i32 [[CONV]], label [[EPILOG:%.*]] [
; CHECK-NEXT: i32 0, label [[SW1:%.*]]
; CHECK-NEXT: i32 1, label [[SW2:%.*]]
; CHECK-NEXT: ]
; CHECK: sw1:
; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i8 [[X1:%.*]], [[X2:%.*]]
; CHECK-NEXT: br label [[EPILOG]]
; CHECK: sw2:
; CHECK-NEXT: [[CMP2:%.*]] = icmp sle i8 [[X1]], [[X2]]
; CHECK-NEXT: br label [[EPILOG]]
; CHECK: epilog:
; CHECK-NEXT: [[CONDITIONMET_IN:%.*]] = phi i1 [ [[ANOTHER_CONDITION:%.*]], [[ENTRY:%.*]] ], [ [[CMP2]], [[SW2]] ], [ [[CMP1]], [[SW1]] ]
; CHECK-NEXT: ret i1 [[CONDITIONMET_IN]]
;
entry:
%frombool0 = zext i1 %another_condition to i8
%conv = sext i8 %condition to i32
switch i32 %conv, label %epilog [
i32 0, label %sw1
i32 1, label %sw2
]
sw1:
%cmp1 = icmp eq i8 %x1, %x2
%frombool1 = zext i1 %cmp1 to i8
br label %epilog
sw2:
%cmp2 = icmp sle i8 %x1, %x2
%frombool2 = zext i1 %cmp2 to i8
br label %epilog
epilog:
%conditionMet = phi i8 [ %frombool0, %entry ], [ %frombool2, %sw2 ], [ %frombool1, %sw1 ]
%tobool = icmp ne i8 %conditionMet, 0
ret i1 %tobool
}
; Same as above (a phi with more than 2 operands), but two constants
define i1 @PR24766_two_constants(i8 %x1, i8 %x2, i8 %condition) {
; CHECK-LABEL: @PR24766_two_constants(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CONV:%.*]] = sext i8 [[CONDITION:%.*]] to i32
; CHECK-NEXT: switch i32 [[CONV]], label [[EPILOG:%.*]] [
; CHECK-NEXT: i32 0, label [[SW1:%.*]]
; CHECK-NEXT: i32 1, label [[SW2:%.*]]
; CHECK-NEXT: ]
; CHECK: sw1:
; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i8 [[X1:%.*]], [[X2:%.*]]
; CHECK-NEXT: br label [[EPILOG]]
; CHECK: sw2:
; CHECK-NEXT: br label [[EPILOG]]
; CHECK: epilog:
; CHECK-NEXT: [[CONDITIONMET:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ true, [[SW2]] ], [ [[CMP1]], [[SW1]] ]
; CHECK-NEXT: ret i1 [[CONDITIONMET]]
;
entry:
%conv = sext i8 %condition to i32
switch i32 %conv, label %epilog [
i32 0, label %sw1
i32 1, label %sw2
]
sw1:
%cmp1 = icmp eq i8 %x1, %x2
%frombool1 = zext i1 %cmp1 to i8
br label %epilog
sw2:
%cmp2 = icmp sle i8 %x1, %x2
%frombool2 = zext i1 %cmp2 to i8
br label %epilog
epilog:
%conditionMet = phi i8 [ 0, %entry ], [ 1, %sw2 ], [ %frombool1, %sw1 ]
%tobool = icmp ne i8 %conditionMet, 0
ret i1 %tobool
}
; Same as above (a phi with more than 2 operands), but two constants and two variables
define i1 @PR24766_two_constants_two_var(i8 %x1, i8 %x2, i8 %condition) {
; CHECK-LABEL: @PR24766_two_constants_two_var(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CONV:%.*]] = sext i8 [[CONDITION:%.*]] to i32
; CHECK-NEXT: switch i32 [[CONV]], label [[EPILOG:%.*]] [
; CHECK-NEXT: i32 0, label [[SW1:%.*]]
; CHECK-NEXT: i32 1, label [[SW2:%.*]]
; CHECK-NEXT: i32 2, label [[SW3:%.*]]
; CHECK-NEXT: ]
; CHECK: sw1:
; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i8 [[X1:%.*]], [[X2:%.*]]
; CHECK-NEXT: br label [[EPILOG]]
; CHECK: sw2:
; CHECK-NEXT: [[CMP2:%.*]] = icmp sle i8 [[X1]], [[X2]]
; CHECK-NEXT: br label [[EPILOG]]
; CHECK: sw3:
; CHECK-NEXT: br label [[EPILOG]]
; CHECK: epilog:
; CHECK-NEXT: [[CONDITIONMET_SHRUNK:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[CMP2]], [[SW2]] ], [ [[CMP1]], [[SW1]] ], [ true, [[SW3]] ]
; CHECK-NEXT: ret i1 [[CONDITIONMET_SHRUNK]]
;
entry:
%conv = sext i8 %condition to i32
switch i32 %conv, label %epilog [
i32 0, label %sw1
i32 1, label %sw2
i32 2, label %sw3
]
sw1:
%cmp1 = icmp eq i8 %x1, %x2
%frombool1 = zext i1 %cmp1 to i8
br label %epilog
sw2:
%cmp2 = icmp sle i8 %x1, %x2
%frombool2 = zext i1 %cmp2 to i8
br label %epilog
sw3:
%cmp3 = icmp sge i8 %x1, %x2
%frombool3 = zext i1 %cmp3 to i8
br label %epilog
epilog:
%conditionMet = phi i8 [ 0, %entry ], [ %frombool2, %sw2 ], [ %frombool1, %sw1 ], [ 1, %sw3 ]
%tobool = icmp ne i8 %conditionMet, 0
ret i1 %tobool
}
define i1 @phi_allnonzeroconstant(i1 %c, i32 %a, i32 %b) {
; CHECK-LABEL: @phi_allnonzeroconstant(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[C:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
; CHECK: if.then:
; CHECK-NEXT: br label [[IF_END:%.*]]
; CHECK: if.else:
; CHECK-NEXT: call void @dummy()
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: ret i1 false
;
entry:
br i1 %c, label %if.then, label %if.else
if.then: ; preds = %entry
br label %if.end
if.else: ; preds = %entry
call void @dummy()
br label %if.end
if.end: ; preds = %if.else, %if.then
%x.0 = phi i32 [ 1, %if.then ], [ 2, %if.else ]
%or = or i32 %x.0, %a
%cmp1 = icmp eq i32 %or, 0
ret i1 %cmp1
}
define i1 @phi_allnonzerononconstant(i1 %c, i32 %a, i32* nonnull %b1, i32* nonnull %b2) {
; CHECK-LABEL: @phi_allnonzerononconstant(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[C:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
; CHECK: if.then:
; CHECK-NEXT: br label [[IF_END:%.*]]
; CHECK: if.else:
; CHECK-NEXT: call void @dummy()
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: ret i1 false
;
entry:
br i1 %c, label %if.then, label %if.else
if.then: ; preds = %entry
br label %if.end
if.else: ; preds = %entry
call void @dummy()
br label %if.end
if.end: ; preds = %if.else, %if.then
%x.0 = phi i32* [ %b1, %if.then ], [ %b2, %if.else ]
%cmp1 = icmp eq i32* %x.0, null
ret i1 %cmp1
}
declare void @dummy()
define i1 @phi_knownnonzero_eq(i32 %n, i32 %s, i32* nocapture readonly %P) {
; CHECK-LABEL: @phi_knownnonzero_eq(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp slt i32 [[N:%.*]], [[S:%.*]]
; CHECK-NEXT: br i1 [[TOBOOL]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
; CHECK: if.then:
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: [[A_0:%.*]] = phi i32 [ 1, [[IF_THEN]] ], [ [[N]], [[ENTRY:%.*]] ]
; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i32 [[A_0]], 0
; CHECK-NEXT: ret i1 [[CMP1]]
;
entry:
%tobool = icmp slt i32 %n, %s
br i1 %tobool, label %if.end, label %if.then
if.then: ; preds = %entry
%0 = load i32, i32* %P
%cmp = icmp eq i32 %n, %0
%1 = select i1 %cmp, i32 1, i32 2
br label %if.end
if.end: ; preds = %entry, %if.then
%a.0 = phi i32 [ %1, %if.then ], [ %n, %entry ]
%cmp1 = icmp eq i32 %a.0, 0
ret i1 %cmp1
}
define i1 @phi_knownnonzero_ne(i32 %n, i32 %s, i32* nocapture readonly %P) {
; CHECK-LABEL: @phi_knownnonzero_ne(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp slt i32 [[N:%.*]], [[S:%.*]]
; CHECK-NEXT: br i1 [[TOBOOL]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
; CHECK: if.then:
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: [[A_0:%.*]] = phi i32 [ 1, [[IF_THEN]] ], [ [[N]], [[ENTRY:%.*]] ]
; CHECK-NEXT: [[CMP1:%.*]] = icmp ne i32 [[A_0]], 0
; CHECK-NEXT: ret i1 [[CMP1]]
;
entry:
%tobool = icmp slt i32 %n, %s
br i1 %tobool, label %if.end, label %if.then
if.then: ; preds = %entry
%0 = load i32, i32* %P
%cmp = icmp eq i32 %n, %0
%1 = select i1 %cmp, i32 1, i32 2
br label %if.end
if.end: ; preds = %entry, %if.then
%a.0 = phi i32 [ %1, %if.then ], [ %n, %entry ]
%cmp1 = icmp ne i32 %a.0, 0
ret i1 %cmp1
}
define i1 @phi_knownnonzero_eq_2(i32 %n, i32 %s, i32* nocapture readonly %P) {
; CHECK-LABEL: @phi_knownnonzero_eq_2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp slt i32 [[N:%.*]], [[S:%.*]]
; CHECK-NEXT: br i1 [[TOBOOL]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
; CHECK: if.then:
; CHECK-NEXT: br i1 true, label [[IF_ELSE:%.*]], label [[IF_END]]
; CHECK: if.else:
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: [[A_0:%.*]] = phi i32 [ 2, [[IF_ELSE]] ], [ [[N]], [[ENTRY:%.*]] ], [ 2, [[IF_THEN]] ]
; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i32 [[A_0]], 0
; CHECK-NEXT: ret i1 [[CMP1]]
;
entry:
%tobool = icmp slt i32 %n, %s
br i1 %tobool, label %if.then, label %if.end
if.then:
%tobool2 = icmp slt i32 %n, %s
br i1 %tobool2, label %if.else, label %if.end
if.else: ; preds = %entry
%0 = load i32, i32* %P
%cmp = icmp eq i32 %n, %0
%1 = select i1 %cmp, i32 1, i32 2
br label %if.end
if.end: ; preds = %entry, %if.then
%a.0 = phi i32 [ %1, %if.else], [ %n, %entry ], [2, %if.then]
%cmp1 = icmp eq i32 %a.0, 0
ret i1 %cmp1
}
define i1 @phi_knownnonzero_ne_2(i32 %n, i32 %s, i32* nocapture readonly %P) {
; CHECK-LABEL: @phi_knownnonzero_ne_2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp slt i32 [[N:%.*]], [[S:%.*]]
; CHECK-NEXT: br i1 [[TOBOOL]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
; CHECK: if.then:
; CHECK-NEXT: br i1 true, label [[IF_ELSE:%.*]], label [[IF_END]]
; CHECK: if.else:
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: [[A_0:%.*]] = phi i32 [ 2, [[IF_ELSE]] ], [ [[N]], [[ENTRY:%.*]] ], [ 2, [[IF_THEN]] ]
; CHECK-NEXT: [[CMP1:%.*]] = icmp ne i32 [[A_0]], 0
; CHECK-NEXT: ret i1 [[CMP1]]
;
entry:
%tobool = icmp slt i32 %n, %s
br i1 %tobool, label %if.then, label %if.end
if.then:
%tobool2 = icmp slt i32 %n, %s
br i1 %tobool2, label %if.else, label %if.end
if.else: ; preds = %entry
%0 = load i32, i32* %P
%cmp = icmp eq i32 %n, %0
%1 = select i1 %cmp, i32 1, i32 2
br label %if.end
if.end: ; preds = %entry, %if.then
%a.0 = phi i32 [ %1, %if.else], [ %n, %entry ], [2, %if.then]
%cmp1 = icmp ne i32 %a.0, 0
ret i1 %cmp1
}
; This would crash trying to delete an instruction (conv)
; that still had uses because the user (the phi) was not
; updated to remove a use from an unreachable block (g.exit).
define void @main(i1 %cond, i16 %x) {
; CHECK-LABEL: @main(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
; CHECK-NEXT: br i1 [[COND:%.*]], label [[FOR_END:%.*]], label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: unreachable
; CHECK: g.exit:
; CHECK-NEXT: br label [[FOR_COND]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
br label %for.cond
for.cond:
%p = phi double [ %conv, %g.exit ], [ undef, %entry ]
br i1 %cond, label %for.end, label %for.body
for.body:
%conv = sitofp i16 %x to double
unreachable
g.exit:
br label %for.cond
for.end:
store double %p, double* undef
ret void
}
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