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https://github.com/c64scene-ar/llvm-6502.git
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Don't DSe volatile stores.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41456 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -111,9 +111,12 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
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continue;
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Value* pointer = 0;
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if (StoreInst* S = dyn_cast<StoreInst>(BBI))
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pointer = S->getPointerOperand();
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else
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if (StoreInst* S = dyn_cast<StoreInst>(BBI)) {
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if (!S->isVolatile())
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pointer = S->getPointerOperand();
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else
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continue;
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} else
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pointer = cast<FreeInst>(BBI)->getPointerOperand();
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StoreInst*& last = lastStore[pointer];
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@ -194,6 +197,8 @@ bool DSE::handleFreeWithNonTrivialDependency(FreeInst* F, Instruction* dep,
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StoreInst* dependency = dyn_cast<StoreInst>(dep);
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if (!dependency)
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return false;
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else if (dependency->isVolatile())
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return false;
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Value* depPointer = dependency->getPointerOperand();
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const Type* depType = dependency->getOperand(0)->getType();
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@ -253,24 +258,26 @@ bool DSE::handleEndBlock(BasicBlock& BB,
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// If we find a store whose pointer is dead...
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if (StoreInst* S = dyn_cast<StoreInst>(BBI)) {
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Value* pointerOperand = S->getPointerOperand();
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// See through pointer-to-pointer bitcasts
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TranslatePointerBitCasts(pointerOperand);
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if (!S->isVolatile()) {
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Value* pointerOperand = S->getPointerOperand();
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// See through pointer-to-pointer bitcasts
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TranslatePointerBitCasts(pointerOperand);
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if (deadPointers.count(pointerOperand)){
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// Remove it!
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MD.removeInstruction(S);
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if (deadPointers.count(pointerOperand)){
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// Remove it!
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MD.removeInstruction(S);
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// DCE instructions only used to calculate that store
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if (Instruction* D = dyn_cast<Instruction>(S->getOperand(0)))
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possiblyDead.insert(D);
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if (Instruction* D = dyn_cast<Instruction>(S->getOperand(1)))
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possiblyDead.insert(D);
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// DCE instructions only used to calculate that store
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if (Instruction* D = dyn_cast<Instruction>(S->getOperand(0)))
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possiblyDead.insert(D);
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if (Instruction* D = dyn_cast<Instruction>(S->getOperand(1)))
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possiblyDead.insert(D);
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BBI++;
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S->eraseFromParent();
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NumFastStores++;
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MadeChange = true;
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BBI++;
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S->eraseFromParent();
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NumFastStores++;
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MadeChange = true;
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}
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}
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continue;
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