105 lines
3.5 KiB
LLVM
105 lines
3.5 KiB
LLVM
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; RUN: opt -S -early-cse -earlycse-debug-hash < %s | FileCheck %s
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; RUN: opt -S -gvn < %s | FileCheck %s
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; RUN: opt -S -newgvn < %s | FileCheck %s
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; RUN: opt -S -O3 < %s | FileCheck %s
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; These tests checks if passes with CSE functionality can do CSE on
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; launder.invariant.group, that is prohibited if there is a memory clobber
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; between barriers call.
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; CHECK-LABEL: define i8 @optimizable()
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define i8 @optimizable() {
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entry:
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%ptr = alloca i8
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store i8 42, i8* %ptr, !invariant.group !0
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; CHECK: call i8* @llvm.launder.invariant.group.p0i8
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%ptr2 = call i8* @llvm.launder.invariant.group.p0i8(i8* %ptr)
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; FIXME: This one could be CSE
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; CHECK: call i8* @llvm.launder.invariant.group
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%ptr3 = call i8* @llvm.launder.invariant.group.p0i8(i8* %ptr)
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; CHECK: call void @clobber(i8* {{.*}}%ptr)
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call void @clobber(i8* %ptr)
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; CHECK: call void @use(i8* {{.*}}%ptr2)
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call void @use(i8* %ptr2)
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; CHECK: call void @use(i8* {{.*}}%ptr3)
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call void @use(i8* %ptr3)
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; CHECK: load i8, i8* %ptr3, {{.*}}!invariant.group
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%v = load i8, i8* %ptr3, !invariant.group !0
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ret i8 %v
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}
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; CHECK-LABEL: define i8 @unoptimizable()
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define i8 @unoptimizable() {
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entry:
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%ptr = alloca i8
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store i8 42, i8* %ptr, !invariant.group !0
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; CHECK: call i8* @llvm.launder.invariant.group.p0i8
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%ptr2 = call i8* @llvm.launder.invariant.group.p0i8(i8* %ptr)
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call void @clobber(i8* %ptr)
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; CHECK: call i8* @llvm.launder.invariant.group.p0i8
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%ptr3 = call i8* @llvm.launder.invariant.group.p0i8(i8* %ptr)
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; CHECK: call void @clobber(i8* {{.*}}%ptr)
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call void @clobber(i8* %ptr)
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; CHECK: call void @use(i8* {{.*}}%ptr2)
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call void @use(i8* %ptr2)
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; CHECK: call void @use(i8* {{.*}}%ptr3)
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call void @use(i8* %ptr3)
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; CHECK: load i8, i8* %ptr3, {{.*}}!invariant.group
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%v = load i8, i8* %ptr3, !invariant.group !0
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ret i8 %v
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}
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; CHECK-LABEL: define i8 @unoptimizable2()
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define i8 @unoptimizable2() {
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%ptr = alloca i8
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store i8 42, i8* %ptr, !invariant.group !0
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; CHECK: call i8* @llvm.launder.invariant.group
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%ptr2 = call i8* @llvm.launder.invariant.group.p0i8(i8* %ptr)
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store i8 43, i8* %ptr
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; CHECK: call i8* @llvm.launder.invariant.group
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%ptr3 = call i8* @llvm.launder.invariant.group.p0i8(i8* %ptr)
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; CHECK: call void @clobber(i8* {{.*}}%ptr)
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call void @clobber(i8* %ptr)
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; CHECK: call void @use(i8* {{.*}}%ptr2)
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call void @use(i8* %ptr2)
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; CHECK: call void @use(i8* {{.*}}%ptr3)
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call void @use(i8* %ptr3)
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; CHECK: load i8, i8* %ptr3, {{.*}}!invariant.group
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%v = load i8, i8* %ptr3, !invariant.group !0
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ret i8 %v
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}
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; This test check if optimizer is not proving equality based on mustalias
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; CHECK-LABEL: define void @dontProveEquality(i8* %a)
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define void @dontProveEquality(i8* %a) {
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%b = call i8* @llvm.launder.invariant.group.p0i8(i8* %a)
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%r = icmp eq i8* %b, %a
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; CHECK: call void @useBool(i1 %r)
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call void @useBool(i1 %r)
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%b2 = call i8* @llvm.strip.invariant.group.p0i8(i8* %a)
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%r2 = icmp eq i8* %b2, %a
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; CHECK: call void @useBool(i1 %r2)
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call void @useBool(i1 %r2)
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ret void
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}
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declare void @use(i8* readonly)
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declare void @useBool(i1)
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declare void @clobber(i8*)
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; CHECK: Function Attrs: inaccessiblememonly nofree nosync nounwind speculatable willreturn{{$}}
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; CHECK-NEXT: declare i8* @llvm.launder.invariant.group.p0i8(i8*)
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declare i8* @llvm.launder.invariant.group.p0i8(i8*)
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; CHECK: Function Attrs: nofree nosync nounwind readnone speculatable willreturn{{$}}
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; CHECK-NEXT: declare i8* @llvm.strip.invariant.group.p0i8(i8*)
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declare i8* @llvm.strip.invariant.group.p0i8(i8*)
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!0 = !{}
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