39 lines
1.1 KiB
LLVM
39 lines
1.1 KiB
LLVM
; RUN: opt -basicaa -print-memoryssa -verify-memoryssa -analyze < %s 2>&1 | FileCheck %s
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; 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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; Invariant loads should be considered live on entry, because, once the
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; location is known to be dereferenceable, the value can never change.
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@g = external global i32
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declare void @clobberAllTheThings()
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; CHECK-LABEL: define i32 @foo
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define i32 @foo() {
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; CHECK: 1 = MemoryDef(liveOnEntry)
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; CHECK-NEXT: call void @clobberAllTheThings()
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call void @clobberAllTheThings()
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; CHECK: MemoryUse(liveOnEntry)
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; CHECK-NEXT: %1 = load i32
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%1 = load i32, i32* @g, align 4, !invariant.load !0
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ret i32 %1
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}
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; CHECK-LABEL: define i32 @bar
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define i32 @bar(i32* %a) {
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; CHECK: 1 = MemoryDef(liveOnEntry)
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; CHECK-NEXT: call void @clobberAllTheThings()
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call void @clobberAllTheThings()
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; CHECK: 2 = MemoryDef(1)
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; CHECK-NEXT: %1 = load atomic i32
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%1 = load atomic i32, i32* %a acquire, align 4, !invariant.load !0
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; CHECK: MemoryUse(2)
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; CHECK-NEXT: %2 = load i32
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%2 = load i32, i32* %a, align 4
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ret i32 %2
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}
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!0 = !{}
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