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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) // udiv X, (Select Cond, C1, C2) --> Select Cond, (shr X, C1), (shr X, C2)
// where C1&C2 are powers of two. // 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 *STO = dyn_cast<ConstantInt>(SI->getOperand(1)))
if (ConstantInt *SFO = dyn_cast<ConstantInt>(SI->getOperand(2))) if (ConstantInt *SFO = dyn_cast<ConstantInt>(SI->getOperand(2))) {
if (!STO->isNullValue() && !STO->isNullValue()) { uint64_t TVA = STO->getZExtValue(), FVA = SFO->getZExtValue();
uint64_t TVA = STO->getZExtValue(), FVA = SFO->getZExtValue(); if (isPowerOf2_64(TVA) && isPowerOf2_64(FVA)) {
if (isPowerOf2_64(TVA) && isPowerOf2_64(FVA)) { // Compute the shift amounts
// Compute the shift amounts unsigned TSA = Log2_64(TVA), FSA = Log2_64(FVA);
unsigned TSA = Log2_64(TVA), FSA = Log2_64(FVA); // Construct the "on true" case of the select
// Construct the "on true" case of the select Constant *TC = ConstantInt::get(Op0->getType(), TSA);
Constant *TC = ConstantInt::get(Op0->getType(), TSA); Instruction *TSI = BinaryOperator::createLShr(
Instruction *TSI = BinaryOperator::createLShr( Op0, TC, SI->getName()+".t");
Op0, TC, SI->getName()+".t"); TSI = InsertNewInstBefore(TSI, I);
TSI = InsertNewInstBefore(TSI, I);
// Construct the "on false" case of the select
// Construct the "on false" case of the select Constant *FC = ConstantInt::get(Op0->getType(), FSA);
Constant *FC = ConstantInt::get(Op0->getType(), FSA); Instruction *FSI = BinaryOperator::createLShr(
Instruction *FSI = BinaryOperator::createLShr( Op0, FC, SI->getName()+".f");
Op0, FC, SI->getName()+".f"); FSI = InsertNewInstBefore(FSI, I);
FSI = InsertNewInstBefore(FSI, I);
// construct the select instruction and return it. // construct the select instruction and return it.
return new SelectInst(SI->getOperand(0), TSI, FSI, SI->getName()); return new SelectInst(SI->getOperand(0), TSI, FSI, SI->getName());
}
} }
} }
return 0; return 0;
} }