151 lines
4.1 KiB
LLVM
151 lines
4.1 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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;; Check that we respect lifetime.start/lifetime.end intrinsics when deleting
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;; stores that, without the lifetime calls, would be writebacks.
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; CHECK-LABEL: @test_writeback_lifetimes(
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; CHECK-NOMEMSSA-LABEL: @test_writeback_lifetimes(
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define void @test_writeback_lifetimes(i32* %p) {
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entry:
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%q = getelementptr i32, i32* %p, i64 1
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%pv = load i32, i32* %p
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%qv = load i32, i32* %q
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call void @llvm.lifetime.end.p0i8(i64 8, i32* %p)
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call void @llvm.lifetime.start.p0i8(i64 8, i32* %p)
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; CHECK: store i32 %pv
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; CHECK-NOMEMSSA-LABEL: store i32 %pv
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store i32 %pv, i32* %p
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; CHECK: store i32 %qv, i32* %q
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; CHECK-NOMEMSSA-LABEL: store i32 %qv, i32* %q
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store i32 %qv, i32* %q
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ret void
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}
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;; Check that we respect lifetime.start/lifetime.end intrinsics when deleting
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;; stores that, without the lifetime calls, would be writebacks.
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; CHECK-LABEL: @test_writeback_lifetimes_multi_arg(
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; CHECK-NOMEMSSA-LABEL: @test_writeback_lifetimes_multi_arg(
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define void @test_writeback_lifetimes_multi_arg(i32* %p, i32* %q) {
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entry:
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%pv = load i32, i32* %p
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%qv = load i32, i32* %q
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call void @llvm.lifetime.end.p0i8(i64 8, i32* %p)
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call void @llvm.lifetime.start.p0i8(i64 8, i32* %p)
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; CHECK: store i32 %pv
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; CHECK-NOMEMSSA-LABEL: store i32 %pv
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store i32 %pv, i32* %p
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; CHECK: store i32 %qv, i32* %q
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; CHECK-NOMEMSSA-LABEL: store i32 %qv, i32* %q
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store i32 %qv, i32* %q
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ret void
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}
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declare void @llvm.lifetime.end.p0i8(i64, i32*)
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declare void @llvm.lifetime.start.p0i8(i64, i32*)
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