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[Attributor] Use Alias Analysis in noalias callsite argument deduction

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Summary: This patch adds a check of alias analysis in `noalias` callsite argument deduction.

Reviewers: jdoerfert, sstefan1

Reviewed By: jdoerfert

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67604

llvm-svn: 372075
This commit is contained in:
Hideto Ueno 2019-09-17 06:53:27 +00:00
parent e89a3c1190
commit e74a978cb1
3 changed files with 20 additions and 14 deletions
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15
lib/Transforms/IPO/Attributor.cpp
View File

@ -1762,11 +1762,18 @@ struct AANoAliasCallSiteArgument final : AANoAliasImpl {
if (!ArgOp->getType()->isPointerTy())
continue;
// TODO: Use AliasAnalysis
// AAResults& AAR = ..;
// if(AAR.isNoAlias(&getAssociatedValue(), ArgOp))
// return indicatePessimitisicFixpoint();
if (const Function *F = getAnchorScope()) {
if (AAResults *AAR = A.getInfoCache().getAAResultsForFunction(*F)) {
LLVM_DEBUG(dbgs()
<< "[Attributor][NoAliasCSArg] Check alias between "
"callsite arguments "
<< AAR->isNoAlias(&getAssociatedValue(), ArgOp) << " "
<< getAssociatedValue() << " " << *ArgOp << "\n");
if (AAR->isNoAlias(&getAssociatedValue(), ArgOp))
continue;
}
}
return indicatePessimisticFixpoint();
}

4
test/Transforms/FunctionAttrs/internal-noalias.ll
View File

@ -1,4 +1,4 @@
; RUN: opt -S -attributor -attributor-disable=false -attributor-max-iterations-verify -attributor-max-iterations=6 < %s | FileCheck %s
; RUN: opt -S -passes=attributor -aa-pipeline='basic-aa' -attributor-disable=false -attributor-max-iterations-verify -attributor-max-iterations=6 < %s | FileCheck %s
define dso_local i32 @visible(i32* noalias %A, i32* noalias %B) #0 {
entry:
@ -10,7 +10,7 @@ entry:
; FIXME: Should be something like this.
; define internal i32 @noalias_args(i32* nocapture readonly %A, i32* noalias nocapture readonly %B)
; CHECK: define internal i32 @noalias_args(i32* nocapture %A, i32* nocapture %B)
; CHECK: define internal i32 @noalias_args(i32* nocapture %A, i32* noalias nocapture %B)
define internal i32 @noalias_args(i32* %A, i32* %B) #0 {
entry:

15
test/Transforms/FunctionAttrs/noalias_returned.ll
View File

@ -1,4 +1,4 @@
; RUN: opt -S -attributor -attributor-disable=false -attributor-max-iterations-verify -attributor-max-iterations=5 < %s | FileCheck %s
; RUN: opt -S -passes=attributor -aa-pipeline='basic-aa' -attributor-disable=false -attributor-max-iterations-verify -attributor-max-iterations=5 < %s | FileCheck %s
; TEST 1 - negative.
@ -203,7 +203,7 @@ define void @test12_1() {
; CHECK-NEXT: [[B:%.*]] = tail call noalias i8* @malloc(i64 4)
; CHECK-NEXT: tail call void @use_nocapture(i8* noalias nonnull align 4 dereferenceable(1) [[A]])
; CHECK-NEXT: tail call void @use_nocapture(i8* noalias nonnull align 4 dereferenceable(1) [[A]])
; CHECK-NEXT: tail call void @use_nocapture(i8* noalias [[B]])
; CHECK-NEXT: tail call void @use_nocapture(i8* noalias nocapture [[B]])
; CHECK-NEXT: tail call void @use_nocapture(i8* noalias [[B]])
; CHECK-NEXT: ret void
;
@ -220,7 +220,7 @@ define void @test12_2(){
; CHECK-LABEL: @test12_2(
; CHECK-NEXT: [[A:%.*]] = tail call noalias i8* @malloc(i64 4)
; FIXME: This should be @use_nocapture(i8* noalias [[A]])
; CHECK-NEXT: tail call void @use_nocapture(i8* [[A]])
; CHECK-NEXT: tail call void @use_nocapture(i8* nocapture [[A]])
; FIXME: This should be @use_nocapture(i8* noalias [[A]])
; CHECK-NEXT: tail call void @use_nocapture(i8* [[A]])
; CHECK-NEXT: tail call void @use(i8* [[A]])
@ -239,7 +239,7 @@ declare void @two_args(i8* nocapture , i8* nocapture)
define void @test12_3(){
; CHECK-LABEL: @test12_3(
%A = tail call noalias i8* @malloc(i64 4)
; CHECK: tail call void @two_args(i8* %A, i8* %A)
; CHECK: tail call void @two_args(i8* nocapture %A, i8* %A)
tail call void @two_args(i8* %A, i8* %A)
ret void
}
@ -252,18 +252,17 @@ define void @test12_4(){
%A_1 = getelementptr i8, i8* %A, i64 1
%B_0 = getelementptr i8, i8* %B, i64 0
; FIXME: This should be @two_args(i8* noalias %A, i8* noalias %B)
; CHECK: tail call void @two_args(i8* %A, i8* %B)
; CHECK: tail call void @two_args(i8* noalias %A, i8* noalias %B)
tail call void @two_args(i8* %A, i8* %B)
; CHECK: tail call void @two_args(i8* %A, i8* %A_0)
; CHECK: tail call void @two_args(i8* %A, i8* nocapture %A_0)
tail call void @two_args(i8* %A, i8* %A_0)
; CHECK: tail call void @two_args(i8* %A, i8* %A_1)
tail call void @two_args(i8* %A, i8* %A_1)
; FIXME: This should be @two_args(i8* noalias %A_0, i8* noalias %B_0)
; CHECK: tail call void @two_args(i8* %A_0, i8* %B_0)
; CHECK: tail call void @two_args(i8* %A_0, i8* nocapture %B_0)
tail call void @two_args(i8* %A_0, i8* %B_0)
ret void
}