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
54 lines
1.3 KiB
LLVM
54 lines
1.3 KiB
LLVM
; RUN: opt -aa-pipeline=basic-aa -passes='print<memoryssa>,verify<memoryssa>' -disable-output < %s 2>&1 | FileCheck %s
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;
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; Ensuring that external functions without attributes are MemoryDefs
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@g = external global i32
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declare void @modifyG()
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define i32 @foo(i1 %arg) {
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; CHECK: MemoryUse(liveOnEntry)
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; CHECK-NEXT: %1 = load i32
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%1 = load i32, ptr @g
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; CHECK: 1 = MemoryDef(liveOnEntry)
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; CHECK-NEXT: store i32 4
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store i32 4, ptr @g, align 4
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; CHECK: 2 = MemoryDef(1)
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; CHECK-NEXT: call void @modifyG()
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call void @modifyG()
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; CHECK: MemoryUse(2)
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; CHECK-NEXT: %2 = load i32
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%2 = load i32, ptr @g
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%3 = add i32 %2, %1
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ret i32 %3
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}
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declare void @readEverything() readonly
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declare void @clobberEverything()
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; CHECK-LABEL: define void @bar
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define void @bar(i1 %arg) {
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; CHECK: 1 = MemoryDef(liveOnEntry)
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; CHECK-NEXT: call void @clobberEverything()
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call void @clobberEverything()
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br i1 %arg, label %if.end, label %if.then
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if.then:
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; CHECK: MemoryUse(1)
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; CHECK-NEXT: call void @readEverything()
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call void @readEverything()
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; CHECK: 2 = MemoryDef(1)
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; CHECK-NEXT: call void @clobberEverything()
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call void @clobberEverything()
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br label %if.end
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if.end:
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; CHECK: 3 = MemoryPhi({%0,1},{if.then,2})
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; CHECK: MemoryUse(3)
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; CHECK-NEXT: call void @readEverything()
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call void @readEverything()
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ret void
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}
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