fa0071baab
OptimizeNoopCopyExpression was sinking same-type bitcasts (e.g. bitcast i32 to i32) which would then be reintroduced by optimizePhiType, causing an infinite loop. Fix by adding a check (PhiTy == ConvertTy) in optimizePhiType to skip the conversion when types are already identical. Fixes #176688.
28 lines
910 B
LLVM
28 lines
910 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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; RUN: opt -S -mtriple=x86_64-unknown-linux-gnu -passes="require<profile-summary>,function(codegenprepare)" < %s | FileCheck %s
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; Check that CodeGenPrepare does not hang on this input.
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; This was caused by an infinite loop between OptimizeNoopCopyExpression
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; and optimizePhiType when handling same-type bitcasts.
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define void @foo(ptr %p) {
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; CHECK-LABEL: define void @foo(
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; CHECK-SAME: ptr [[P:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[VAL:%.*]] = load i32, ptr [[P]], align 4
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; CHECK-NEXT: store i32 [[VAL]], ptr [[P]], align 4
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; CHECK-NEXT: ret void
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;
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entry:
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%val = load i32, ptr %p, align 4
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br i1 false, label %bb1, label %bb3
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bb1:
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%c1 = bitcast i32 %val to i32
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br label %bb3
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bb3:
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%phi = phi i32 [ %c1, %bb1 ], [ %val, %entry ]
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store i32 %phi, ptr %p, align 4
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ret void
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}
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