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reversed the logic of the log2 detection routine to reduce the number of nested ifs

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169049 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pedro Artigas 2012-11-30 22:47:15 +00:00
parent d6964741f5
commit ef2ef3e246
1 changed files with 29 additions and 25 deletions
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54
lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
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@ -261,31 +261,35 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
// //
static void detectLog2OfHalf(Value *&Op, Value *&Y, IntrinsicInst *&Log2) { static void detectLog2OfHalf(Value *&Op, Value *&Y, IntrinsicInst *&Log2) {
if (Op->hasOneUse()) {
if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(Op)) { if (!Op->hasOneUse())
if (II->getIntrinsicID() == Intrinsic::log2 && return;
II->hasUnsafeAlgebra()) {
Log2 = II; IntrinsicInst *II = dyn_cast<IntrinsicInst>(Op);
Value *OpLog2Of = II->getArgOperand(0); if (!II)
if (OpLog2Of->hasOneUse()) { return;
if (Instruction *I = dyn_cast<Instruction>(OpLog2Of)) { if (II->getIntrinsicID() != Intrinsic::log2 || !II->hasUnsafeAlgebra())
if (I->getOpcode() == Instruction::FMul && return;
I->hasUnsafeAlgebra()) { Log2 = II;
ConstantFP *CFP = dyn_cast<ConstantFP>(I->getOperand(0));
if (CFP && CFP->isExactlyValue(0.5)) { Value *OpLog2Of = II->getArgOperand(0);
Y = I->getOperand(1); if (!OpLog2Of->hasOneUse())
} else { return;
CFP = dyn_cast<ConstantFP>(I->getOperand(1));
if (CFP && CFP->isExactlyValue(0.5)) { Instruction *I = dyn_cast<Instruction>(OpLog2Of);
Y = I->getOperand(0); if (!I)
} return;
} if (I->getOpcode() != Instruction::FMul || !I->hasUnsafeAlgebra())
} return;
}
} ConstantFP *CFP = dyn_cast<ConstantFP>(I->getOperand(0));
} if (CFP && CFP->isExactlyValue(0.5)) {
} Y = I->getOperand(1);
} return;
}
CFP = dyn_cast<ConstantFP>(I->getOperand(1));
if (CFP && CFP->isExactlyValue(0.5))
Y = I->getOperand(0);
} }
Instruction *InstCombiner::visitFMul(BinaryOperator &I) { Instruction *InstCombiner::visitFMul(BinaryOperator &I) {