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[SimplifyCFG] Hoisting invalidates metadata 

We forgot to remove optimization metadata when performing hosting during
FoldTwoEntryPHINode.

This fixes PR29163.

llvm-svn: 279980
This commit is contained in:
David Majnemer 2016-08-29 17:14:08 +00:00
parent cfec5ff1b9
commit e8fd5f9ffd
2 changed files with 39 additions and 2 deletions
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10
llvm/lib/Transforms/Utils/SimplifyCFG.cpp
View File

@ -2110,14 +2110,20 @@ static bool FoldTwoEntryPHINode(PHINode *PN, const TargetTransformInfo &TTI,
// Move all 'aggressive' instructions, which are defined in the
// conditional parts of the if's up to the dominating block.
if (IfBlock1)
if (IfBlock1) {
for (auto &I : *IfBlock1)
I.dropUnknownNonDebugMetadata();
DomBlock->getInstList().splice(InsertPt->getIterator(),
IfBlock1->getInstList(), IfBlock1->begin(),
IfBlock1->getTerminator()->getIterator());
if (IfBlock2)
}
if (IfBlock2) {
for (auto &I : *IfBlock2)
I.dropUnknownNonDebugMetadata();
DomBlock->getInstList().splice(InsertPt->getIterator(),
IfBlock2->getInstList(), IfBlock2->begin(),
IfBlock2->getTerminator()->getIterator());
}
while (PHINode *PN = dyn_cast<PHINode>(BB->begin())) {
// Change the PHI node into a select instruction.

31
llvm/test/Transforms/SimplifyCFG/PR29163.ll Normal file
View File

@ -0,0 +1,31 @@
; RUN: opt -S -simplifycfg < %s | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@GV = external constant i64*
define i64* @test1(i1 %cond, i8* %P) {
entry:
br i1 %cond, label %if, label %then
then:
%bc = bitcast i8* %P to i64*
br label %join
if:
%load = load i64*, i64** @GV, align 8, !dereferenceable !0
br label %join
join:
%phi = phi i64* [ %bc, %then ], [ %load, %if ]
ret i64* %phi
}
; CHECK-LABEL: define i64* @test1(
; CHECK: %[[bc:.*]] = bitcast i8* %P to i64*
; CHECK: %[[load:.*]] = load i64*, i64** @GV, align 8{{$}}
; CHECK: %[[phi:.*]] = select i1 %cond, i64* %[[load]], i64* %[[bc]]
; CHECK: ret i64* %[[phi]]
!0 = !{i64 8}