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Value# select instructions, allowing -gcse to remove duplicates
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25969 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -80,8 +80,9 @@ namespace {
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void visitGetElementPtrInst(GetElementPtrInst &I);
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void visitCastInst(CastInst &I);
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void visitShiftInst(ShiftInst &I) { handleBinaryInst((Instruction&)I); }
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void visitSelectInst(SelectInst &I);
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void visitInstruction(Instruction &) {
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// Cannot value number calls or terminator instructions...
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// Cannot value number calls or terminator instructions.
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}
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};
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}
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@ -198,4 +199,38 @@ void BVNImpl::visitGetElementPtrInst(GetElementPtrInst &I) {
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}
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}
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// isIdenticalSelectInst - Return true if the two select instructions are
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// identical.
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//
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static inline bool isIdenticalSelectInst(const SelectInst &I1,
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const SelectInst *I2) {
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// Is it embedded in the same function? (This could be false if LHS
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// is a constant or global!)
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if (I1.getParent()->getParent() != I2->getParent()->getParent())
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return false;
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// They are identical if both operands are the same!
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return I1.getOperand(0) == I2->getOperand(0) &&
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I1.getOperand(1) == I2->getOperand(1) &&
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I1.getOperand(2) == I2->getOperand(2);
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return true;
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return false;
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}
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void BVNImpl::visitSelectInst(SelectInst &I) {
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Value *Cond = I.getOperand(0);
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for (Value::use_iterator UI = Cond->use_begin(), UE = Cond->use_end();
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UI != UE; ++UI)
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if (SelectInst *Other = dyn_cast<SelectInst>(*UI))
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// Check to see if this new select is not I, but has the same operands.
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if (Other != &I && isIdenticalSelectInst(I, Other)) {
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// These instructions are identical. Handle the situation.
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RetVals.push_back(Other);
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}
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}
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void llvm::BasicValueNumberingStub() { }
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