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Minor speedups for the instcombine pass
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8894 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1939,16 +1939,15 @@ bool InstCombiner::runOnFunction(Function &F) {
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// Check to see if we can DIE the instruction...
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if (isInstructionTriviallyDead(I)) {
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// Add operands to the worklist...
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for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
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if (Instruction *Op = dyn_cast<Instruction>(I->getOperand(i)))
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WorkList.push_back(Op);
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if (I->getNumOperands() < 4)
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for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
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if (Instruction *Op = dyn_cast<Instruction>(I->getOperand(i)))
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WorkList.push_back(Op);
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++NumDeadInst;
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BasicBlock::iterator BBI = I;
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if (dceInstruction(BBI)) {
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removeFromWorkList(I);
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continue;
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}
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I->getParent()->getInstList().erase(I);
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removeFromWorkList(I);
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continue;
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}
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// Instruction isn't dead, see if we can constant propagate it...
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@ -1960,11 +1959,8 @@ bool InstCombiner::runOnFunction(Function &F) {
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ReplaceInstUsesWith(*I, C);
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++NumConstProp;
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BasicBlock::iterator BBI = I;
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if (dceInstruction(BBI)) {
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removeFromWorkList(I);
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continue;
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}
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I->getParent()->getInstList().erase(I);
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continue;
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}
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// Now that we have an instruction, try combining it to simplify it...
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@ -1975,7 +1971,20 @@ bool InstCombiner::runOnFunction(Function &F) {
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// Instructions can end up on the worklist more than once. Make sure
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// we do not process an instruction that has been deleted.
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removeFromWorkList(I);
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ReplaceInstWithInst(I, Result);
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// Move the name to the new instruction first...
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std::string OldName = I->getName(); I->setName("");
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Result->setName(I->getName());
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// Insert the new instruction into the basic block...
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BasicBlock *InstParent = I->getParent();
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InstParent->getInstList().insert(I, Result);
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// Everything uses the new instruction now...
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I->replaceAllUsesWith(Result);
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// Erase the old instruction.
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InstParent->getInstList().erase(I);
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} else {
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BasicBlock::iterator II = I;
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