fd95f398c7
Unfortunately the commit (D123162) introduced a mis-compile (https://github.com/llvm/llvm-project/issues/70547), which wasn't fixed by the alternative fix (c0de28b92e) I think as long as the call considered as ephemeral is not removed, we need to be conservative. To address the correctness issue quickly, I think we should revert the patch (as this patch does, it doens't revert cleanly) This reverts commit17fdaccccf. Fixes https://github.com/llvm/llvm-project/issues/70547
63 lines
1.8 KiB
LLVM
63 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=dse -S < %s | FileCheck %s
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@global = external constant i8
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define void @f() {
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; CHECK-LABEL: @f(
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; CHECK-NEXT: [[TMP1:%.*]] = call noalias ptr @_Znwm(i64 32)
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; CHECK-NEXT: [[TMP2:%.*]] = icmp ugt ptr [[TMP1]], @global
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; CHECK-NEXT: call void @llvm.assume(i1 [[TMP2]])
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; CHECK-NEXT: store i8 0, ptr [[TMP1]], align 1
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; CHECK-NEXT: ret void
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;
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%tmp1 = call noalias ptr @_Znwm(i64 32)
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%tmp2 = icmp ugt ptr %tmp1, @global
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call void @llvm.assume(i1 %tmp2)
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store i8 0, ptr %tmp1, align 1
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ret void
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}
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define void @f2() {
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; CHECK-LABEL: @f2(
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; CHECK-NEXT: [[TMP1:%.*]] = call noalias ptr @_Znwm(i64 32)
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; CHECK-NEXT: [[TMP2:%.*]] = icmp ugt ptr [[TMP1]], @global
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; CHECK-NEXT: call void @llvm.assume(i1 [[TMP2]])
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; CHECK-NEXT: store i8 0, ptr [[TMP1]], align 1
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; CHECK-NEXT: call void @quux(ptr @global)
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; CHECK-NEXT: ret void
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;
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%tmp1 = call noalias ptr @_Znwm(i64 32)
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%tmp2 = icmp ugt ptr %tmp1, @global
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call void @llvm.assume(i1 %tmp2)
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store i8 0, ptr %tmp1, align 1
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call void @quux(ptr @global)
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ret void
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}
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; FIXME: This is a miscompile
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define void @pr70547() {
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; CHECK-LABEL: @pr70547(
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; CHECK-NEXT: [[A:%.*]] = alloca i8, align 1
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; CHECK-NEXT: store i8 0, ptr [[A]], align 1
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; CHECK-NEXT: [[CALL:%.*]] = call ptr @quux(ptr [[A]]) #[[ATTR1:[0-9]+]]
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; CHECK-NEXT: [[V:%.*]] = load i8, ptr [[CALL]], align 1
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; CHECK-NEXT: [[CMP:%.*]] = icmp ne i8 [[V]], 1
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; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: ret void
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;
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%a = alloca i8
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store i8 0, ptr %a
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%call = call ptr @quux(ptr %a) memory(none) nounwind willreturn
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%v = load i8, ptr %call
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%cmp = icmp ne i8 %v, 1
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call void @llvm.assume(i1 %cmp)
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ret void
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}
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declare ptr @_Znwm(i64)
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declare void @llvm.assume(i1)
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declare void @quux(ptr)
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