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don't delete the last store to an alloca if the store is volatile. 

llvm-svn: 50390
This commit is contained in:
Chris Lattner 2008-04-29 04:58:38 +00:00
parent 5c88f7b1ad
commit e331a65c79
2 changed files with 9 additions and 1 deletions
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2
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -10311,7 +10311,7 @@ Instruction *InstCombiner::visitStoreInst(StoreInst &SI) {
// If the RHS is an alloca with a single use, zapify the store, making the // If the RHS is an alloca with a single use, zapify the store, making the
// alloca dead. // alloca dead.
if (Ptr->hasOneUse()) { if (Ptr->hasOneUse() && !SI.isVolatile()) {
if (isa<AllocaInst>(Ptr)) { if (isa<AllocaInst>(Ptr)) {
EraseInstFromFunction(SI); EraseInstFromFunction(SI);
++NumCombined; ++NumCombined;

8
llvm/test/Transforms/InstCombine/2008-04-28-VolatileStore.ll Normal file
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@ -0,0 +1,8 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {volatile store}
define void @test() {
%votf = alloca <4 x float> ; <<4 x float>*> [#uses=1]
volatile store <4 x float> zeroinitializer, <4 x float>* %votf, align 16
ret void
}