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

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50390 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-04-29 04:58:38 +00:00
parent 3fb2968f2f
commit cea1fdd174
2 changed files with 9 additions and 1 deletions
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2
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
// alloca dead.
if (Ptr->hasOneUse()) {
if (Ptr->hasOneUse() && !SI.isVolatile()) {
if (isa<AllocaInst>(Ptr)) {
EraseInstFromFunction(SI);
++NumCombined;

8
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
}