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Remove an unnecessary if statement and adjust indentation.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34939 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-03-05 23:36:13 +00:00
parent 229baffc4e
commit baf1e4b914
1 changed files with 20 additions and 22 deletions
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42
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -2407,31 +2407,29 @@ Instruction *InstCombiner::visitUDiv(BinaryOperator &I) {
// udiv X, (Select Cond, C1, C2) --> Select Cond, (shr X, C1), (shr X, C2)
// where C1&C2 are powers of two.
if (SelectInst *SI = dyn_cast<SelectInst>(Op1)) {
if (SelectInst *SI = dyn_cast<SelectInst>(Op1))
if (ConstantInt *STO = dyn_cast<ConstantInt>(SI->getOperand(1)))
if (ConstantInt *SFO = dyn_cast<ConstantInt>(SI->getOperand(2)))
if (!STO->isNullValue() && !STO->isNullValue()) {
uint64_t TVA = STO->getZExtValue(), FVA = SFO->getZExtValue();
if (isPowerOf2_64(TVA) && isPowerOf2_64(FVA)) {
// Compute the shift amounts
unsigned TSA = Log2_64(TVA), FSA = Log2_64(FVA);
// Construct the "on true" case of the select
Constant *TC = ConstantInt::get(Op0->getType(), TSA);
Instruction *TSI = BinaryOperator::createLShr(
Op0, TC, SI->getName()+".t");
TSI = InsertNewInstBefore(TSI, I);
// Construct the "on false" case of the select
Constant *FC = ConstantInt::get(Op0->getType(), FSA);
Instruction *FSI = BinaryOperator::createLShr(
Op0, FC, SI->getName()+".f");
FSI = InsertNewInstBefore(FSI, I);
if (ConstantInt *SFO = dyn_cast<ConstantInt>(SI->getOperand(2))) {
uint64_t TVA = STO->getZExtValue(), FVA = SFO->getZExtValue();
if (isPowerOf2_64(TVA) && isPowerOf2_64(FVA)) {
// Compute the shift amounts
unsigned TSA = Log2_64(TVA), FSA = Log2_64(FVA);
// Construct the "on true" case of the select
Constant *TC = ConstantInt::get(Op0->getType(), TSA);
Instruction *TSI = BinaryOperator::createLShr(
Op0, TC, SI->getName()+".t");
TSI = InsertNewInstBefore(TSI, I);
// Construct the "on false" case of the select
Constant *FC = ConstantInt::get(Op0->getType(), FSA);
Instruction *FSI = BinaryOperator::createLShr(
Op0, FC, SI->getName()+".f");
FSI = InsertNewInstBefore(FSI, I);
// construct the select instruction and return it.
return new SelectInst(SI->getOperand(0), TSI, FSI, SI->getName());
}
// construct the select instruction and return it.
return new SelectInst(SI->getOperand(0), TSI, FSI, SI->getName());
}
}
}
return 0;
}