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reversed the logic of the log2 detection routine to reduce the number of nested ifs
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169049 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -261,31 +261,35 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
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//
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static void detectLog2OfHalf(Value *&Op, Value *&Y, IntrinsicInst *&Log2) {
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if (Op->hasOneUse()) {
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if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(Op)) {
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if (II->getIntrinsicID() == Intrinsic::log2 &&
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II->hasUnsafeAlgebra()) {
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Log2 = II;
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Value *OpLog2Of = II->getArgOperand(0);
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if (OpLog2Of->hasOneUse()) {
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if (Instruction *I = dyn_cast<Instruction>(OpLog2Of)) {
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if (I->getOpcode() == Instruction::FMul &&
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I->hasUnsafeAlgebra()) {
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ConstantFP *CFP = dyn_cast<ConstantFP>(I->getOperand(0));
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if (CFP && CFP->isExactlyValue(0.5)) {
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Y = I->getOperand(1);
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} else {
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CFP = dyn_cast<ConstantFP>(I->getOperand(1));
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if (CFP && CFP->isExactlyValue(0.5)) {
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Y = I->getOperand(0);
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}
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}
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}
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}
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}
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}
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}
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}
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if (!Op->hasOneUse())
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return;
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IntrinsicInst *II = dyn_cast<IntrinsicInst>(Op);
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if (!II)
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return;
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if (II->getIntrinsicID() != Intrinsic::log2 || !II->hasUnsafeAlgebra())
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return;
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Log2 = II;
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Value *OpLog2Of = II->getArgOperand(0);
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if (!OpLog2Of->hasOneUse())
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return;
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Instruction *I = dyn_cast<Instruction>(OpLog2Of);
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if (!I)
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return;
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if (I->getOpcode() != Instruction::FMul || !I->hasUnsafeAlgebra())
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return;
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ConstantFP *CFP = dyn_cast<ConstantFP>(I->getOperand(0));
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if (CFP && CFP->isExactlyValue(0.5)) {
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Y = I->getOperand(1);
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return;
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}
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CFP = dyn_cast<ConstantFP>(I->getOperand(1));
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if (CFP && CFP->isExactlyValue(0.5))
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Y = I->getOperand(0);
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}
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Instruction *InstCombiner::visitFMul(BinaryOperator &I) {
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