1469d82e1c
As defined in LangRef, branching on `undef` is undefined behavior. This PR aims to remove undefined behavior from tests. As UB tests break Alive2 and may be the root cause of breaking future optimizations. Here's an Alive2 proof for one of the examples: https://alive2.llvm.org/ce/z/TncxhP
36 lines
1.2 KiB
LLVM
36 lines
1.2 KiB
LLVM
; RUN: opt -disable-output -passes='loop-mssa(licm),print<memoryssa>' < %s 2>&1 | FileCheck %s
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@v_274 = external dso_local global i64, align 1
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@v_295 = external dso_local global i16, align 1
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@v_335 = external dso_local global i32, align 1
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; CHECK-LABEL: @main(i1 %arg)
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; CHECK-NOT: 5 = MemoryPhi(
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; CHECK-NOT: 6 = MemoryPhi(
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; CHECK: 4 = MemoryPhi(
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; CHECK-NOT: 7 = MemoryPhi(
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define dso_local void @main(i1 %arg) {
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entry:
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store i32 undef, ptr @v_335, align 1
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br i1 %arg, label %gate, label %exit
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nopredentry1: ; No predecessors!
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br label %preinfiniteloop
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nopredentry2: ; No predecessors!
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br label %gate
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gate: ; preds = %nopredentry2, %entry
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br i1 %arg, label %preinfiniteloop, label %exit
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preinfiniteloop: ; preds = %gate, %nopredentry1
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br label %infiniteloop
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infiniteloop: ; preds = %infiniteloop, %preinfiniteloop
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store i16 undef, ptr @v_295, align 1
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br label %infiniteloop
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exit: ; preds = %gate, %entry
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store i64 undef, ptr @v_274, align 1
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ret void
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}
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