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Merging r214336:

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r214336 | rafael.espindola | 2014-07-30 17:04:00 -0400 (Wed, 30 Jul 2014) | 9 lines

SimplifyCFG: Avoid miscompilations due to removed lifetime intrinsics.

The lifetime intrinsics need some work in order to make it clear which
optimizations are or are not valid.

For now dropping this optimization avoids a miscompilation.

Patch by Björn Steinbrink.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_35@232544 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard 2015-03-17 20:42:08 +00:00
parent 3f8396f9ba
commit a4cf325e41
2 changed files with 4 additions and 4 deletions
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2
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -4008,7 +4008,7 @@ bool SimplifyCFGOpt::SimplifyUncondBranch(BranchInst *BI, IRBuilder<> &Builder){
return true;
// If the Terminator is the only non-phi instruction, simplify the block.
BasicBlock::iterator I = BB->getFirstNonPHIOrDbgOrLifetime();
BasicBlock::iterator I = BB->getFirstNonPHIOrDbg();
if (I->isTerminator() && BB != &BB->getParent()->getEntryBlock() &&
TryToSimplifyUncondBranchFromEmptyBlock(BB))
return true;

6
test/Transforms/SimplifyCFG/lifetime.ll
View File

@ -1,11 +1,11 @@
; RUN: opt < %s -simplifycfg -S | FileCheck %s
; Test that a lifetime intrinsic doesn't prevent us from simplifying this.
; Test that a lifetime intrinsic isn't removed because that would change semantics
; CHECK: foo
; CHECK: entry:
; CHECK-NOT: bb0:
; CHECK-NOT: bb1:
; CHECK: bb0:
; CHECK: bb1:
; CHECK: ret
define void @foo(i1 %x) {
entry: