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Free instructions kill values too. This implements DeadStoreElim/free.llx
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15199 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -79,7 +79,8 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
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}
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#endif
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if (!isa<StoreInst>(I) || cast<StoreInst>(I)->isVolatile()) {
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if (!isa<FreeInst>(I) &&
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(!isa<StoreInst>(I) || cast<StoreInst>(I)->isVolatile())) {
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// If this is a non-store instruction, it makes everything referenced no
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// longer killed. Remove anything aliased from the alias set tracker.
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KillLocs.remove(I);
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@ -90,8 +91,16 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
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// the stored location is already in the tracker, then this is a dead
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// store. We can just delete it here, but while we're at it, we also
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// delete any trivially dead expression chains.
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unsigned ValSize = TD.getTypeSize(I->getOperand(0)->getType());
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Value *Ptr = I->getOperand(1);
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unsigned ValSize;
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Value *Ptr;
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if (isa<StoreInst>(I)) {
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Ptr = I->getOperand(1);
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ValSize = TD.getTypeSize(I->getOperand(0)->getType());
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} else {
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Ptr = I->getOperand(0);
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ValSize = ~0;
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}
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if (AliasSet *AS = KillLocs.getAliasSetForPointerIfExists(Ptr, ValSize))
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for (AliasSet::iterator ASI = AS->begin(), E = AS->end(); ASI != E; ++ASI)
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if (AA.alias(ASI.getPointer(), ASI.getSize(), Ptr, ValSize)
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@ -110,7 +119,7 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
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// Otherwise, this is a non-dead store just add it to the set of dead
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// locations.
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KillLocs.add(cast<StoreInst>(I));
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KillLocs.add(I);
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BigContinue:;
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}
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return MadeChange;
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