mirror of
https://github.com/RPCS3/llvm.git
synced 2026-08-26 18:26:51 -04:00
Piotr Padlewski
9648b46325
Summary: This is one of the initial commit of "RFC: Devirtualization v2" proposal: https://docs.google.com/document/d/16GVtCpzK8sIHNc2qZz6RN8amICNBtvjWUod2SujZVEo/edit?usp=sharing Reviewers: rsmith, amharc, kuhar, sanjoy Subscribers: arsenm, nhaehnle, javed.absar, hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D45111 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331448 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
3.1 KiB
LLVM
95 lines
3.1 KiB
LLVM
; RUN: opt -S -early-cse < %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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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 nounwind speculatable{{$}}
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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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!0 = !{}
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