91e9a5cc23
Now that MemorySSA keeps track of whether MemoryUses are optimized, use getClobberingMemoryAccess() to check MemoryUse memory dependencies since it should no longer be so expensive. This is a follow-up change to https://reviews.llvm.org/D25881 llvm-svn: 285080
109 lines
2.6 KiB
LLVM
109 lines
2.6 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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@G3 = 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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;; Check that memoryphi optimization happens during EarlyCSE, enabling
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;; more load CSE opportunities.
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; CHECK-LABEL: @test_memphiopt(
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; CHECK-NOMEMSSA-LABEL: @test_memphiopt(
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define void @test_memphiopt(i1 %c, i32* %p) {
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; CHECK-LABEL: entry:
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; CHECK-NOMEMSSA-LABEL: entry:
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entry:
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; CHECK: load
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; CHECK-NOMEMSSA: load
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%v1 = load i32, i32* @G1
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br i1 %c, label %then, label %end
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; CHECK-LABEL: then:
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; CHECK-NOMEMSSA-LABEL: then:
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then:
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; CHECK: load
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; CHECK-NOMEMSSA: load
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%pv = load i32, i32* %p
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; CHECK-NOT: store
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; CHECK-NOMEMSSA-NOT: store
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store i32 %pv, i32* %p
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br label %end
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; CHECK-LABEL: end:
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; CHECK-NOMEMSSA-LABEL: end:
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end:
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; CHECK-NOT: load
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; CHECK-NOMEMSSA: load
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%v2 = load i32, i32* @G1
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%sum = add i32 %v1, %v2
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store i32 %sum, i32* @G2
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ret void
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}
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;; Check that MemoryPhi optimization and MemoryUse re-optimization
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;; happens during EarlyCSE, enabling more load CSE opportunities.
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; CHECK-LABEL: @test_memphiopt2(
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; CHECK-NOMEMSSA-LABEL: @test_memphiopt2(
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define void @test_memphiopt2(i1 %c, i32* %p) {
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; CHECK-LABEL: entry:
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; CHECK-NOMEMSSA-LABEL: entry:
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entry:
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; CHECK: load
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; CHECK-NOMEMSSA: load
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%v1 = load i32, i32* @G1
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; CHECK: store
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; CHECK-NOMEMSSA: store
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store i32 %v1, i32* @G2
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br i1 %c, label %then, label %end
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; CHECK-LABEL: then:
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; CHECK-NOMEMSSA-LABEL: then:
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then:
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; CHECK: load
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; CHECK-NOMEMSSA: load
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%pv = load i32, i32* %p
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; CHECK-NOT: store
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; CHECK-NOMEMSSA-NOT: store
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store i32 %pv, i32* %p
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br label %end
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; CHECK-LABEL: end:
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; CHECK-NOMEMSSA-LABEL: end:
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end:
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; CHECK-NOT: load
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; CHECK-NOMEMSSA: load
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%v2 = load i32, i32* @G1
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store i32 %v2, i32* @G3
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ret void
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}
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