8d84605f25
Summary: Use MemorySSA, if requested, to do less conservative memory dependency checking. This change doesn't enable the MemorySSA enhanced EarlyCSE in the default pipelines, so should be NFC. Reviewers: dberlin, sanjoy, reames, majnemer Subscribers: mcrosier, llvm-commits Differential Revision: http://reviews.llvm.org/D19821 llvm-svn: 280279
35 lines
1.0 KiB
LLVM
35 lines
1.0 KiB
LLVM
; RUN: opt < %s -S -early-cse | FileCheck %s --check-prefix=CHECK-NOMEMSSA
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; RUN: opt < %s -S -basicaa -early-cse-memssa | FileCheck %s
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; RUN: opt < %s -S -passes='early-cse' | FileCheck %s --check-prefix=CHECK-NOMEMSSA
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; RUN: opt < %s -S -aa-pipeline=basic-aa -passes='early-cse-memssa' | FileCheck %s
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@G1 = global i32 zeroinitializer
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@G2 = global i32 zeroinitializer
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;; Simple load value numbering across non-clobbering store.
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; CHECK-LABEL: @test1(
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; CHECK-NOMEMSSA-LABEL: @test1(
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define i32 @test1() {
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%V1 = load i32, i32* @G1
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store i32 0, i32* @G2
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%V2 = load i32, i32* @G1
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; CHECK-NOMEMSSA: sub i32 %V1, %V2
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%Diff = sub i32 %V1, %V2
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ret i32 %Diff
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; CHECK: ret i32 0
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}
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;; Simple dead store elimination across non-clobbering store.
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; CHECK-LABEL: @test2(
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; CHECK-NOMEMSSA-LABEL: @test2(
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define void @test2() {
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entry:
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%V1 = load i32, i32* @G1
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; CHECK: store i32 0, i32* @G2
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store i32 0, i32* @G2
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; CHECK-NOT: store
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; CHECK-NOMEMSSA: store i32 %V1, i32* @G1
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store i32 %V1, i32* @G1
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ret void
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}
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