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move fold comments to the corresponding fold; NFC

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228317 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel 2015-02-05 17:33:59 +00:00
parent 9d547b618c
commit bf9263158f
1 changed files with 9 additions and 3 deletions
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12
lib/Target/X86/X86ISelLowering.cpp
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@ -25449,11 +25449,13 @@ static SDValue PerformFSUBCombine(SDNode *N, SelectionDAG &DAG,
/// Do target-specific dag combines on X86ISD::FOR and X86ISD::FXOR nodes.
static SDValue PerformFORCombine(SDNode *N, SelectionDAG &DAG) {
assert(N->getOpcode() == X86ISD::FOR || N->getOpcode() == X86ISD::FXOR);
// F[X]OR(0.0, x) -> x
// F[X]OR(x, 0.0) -> x
if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(0)))
if (C->getValueAPF().isPosZero())
return N->getOperand(1);
// F[X]OR(x, 0.0) -> x
if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(1)))
if (C->getValueAPF().isPosZero())
return N->getOperand(0);
@ -25484,26 +25486,30 @@ static SDValue PerformFMinFMaxCombine(SDNode *N, SelectionDAG &DAG) {
/// Do target-specific dag combines on X86ISD::FAND nodes.
static SDValue PerformFANDCombine(SDNode *N, SelectionDAG &DAG) {
// FAND(0.0, x) -> 0.0
// FAND(x, 0.0) -> 0.0
if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(0)))
if (C->getValueAPF().isPosZero())
return N->getOperand(0);
// FAND(x, 0.0) -> 0.0
if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(1)))
if (C->getValueAPF().isPosZero())
return N->getOperand(1);
return SDValue();
}
/// Do target-specific dag combines on X86ISD::FANDN nodes
static SDValue PerformFANDNCombine(SDNode *N, SelectionDAG &DAG) {
// FANDN(x, 0.0) -> 0.0
// FANDN(0.0, x) -> x
if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(0)))
if (C->getValueAPF().isPosZero())
return N->getOperand(1);
// FANDN(x, 0.0) -> 0.0
if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(1)))
if (C->getValueAPF().isPosZero())
return N->getOperand(1);
return SDValue();
}