diff options
Diffstat (limited to 'lib/Transforms/InstCombine/InstructionCombining.cpp')
| -rw-r--r-- | lib/Transforms/InstCombine/InstructionCombining.cpp | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/lib/Transforms/InstCombine/InstructionCombining.cpp b/lib/Transforms/InstCombine/InstructionCombining.cpp index be7d43bbcf2c3..f530ee1246e8c 100644 --- a/lib/Transforms/InstCombine/InstructionCombining.cpp +++ b/lib/Transforms/InstCombine/InstructionCombining.cpp @@ -3065,9 +3065,11 @@ static bool TryToSinkInstruction(Instruction *I, BasicBlock *DestBlock) { I->isTerminator()) return false; - // Do not sink alloca instructions out of the entry block. - if (isa<AllocaInst>(I) && I->getParent() == - &DestBlock->getParent()->getEntryBlock()) + // Do not sink static or dynamic alloca instructions. Static allocas must + // remain in the entry block, and dynamic allocas must not be sunk in between + // a stacksave / stackrestore pair, which would incorrectly shorten its + // lifetime. + if (isa<AllocaInst>(I)) return false; // Do not sink into catchswitch blocks. |