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Refactor ARM-specific DAG combining in preparation for adding some more

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transformations.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109800 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson 2010-07-29 20:34:14 +00:00
parent f630c712b1
commit 3d5792a5aa
1 changed files with 25 additions and 12 deletions
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37
lib/Target/ARM/ARMISelLowering.cpp
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@ -4221,30 +4221,43 @@ SDValue combineSelectAndUse(SDNode *N, SDValue Slct, SDValue OtherOp,
return SDValue();
}
/// PerformADDCombine - Target-specific dag combine xforms for ISD::ADD.
static SDValue PerformADDCombine(SDNode *N,
TargetLowering::DAGCombinerInfo &DCI) {
// added by evan in r37685 with no testcase.
SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
/// PerformADDCombineWithOperands - Try DAG combinations for an ADD with
/// operands N0 and N1. This is a helper for PerformADDCombine that is
/// called with the default operands, and if that fails, with commuted
/// operands.
static SDValue PerformADDCombineWithOperands(SDNode *N, SDValue N0, SDValue N1,
TargetLowering::DAGCombinerInfo &DCI) {
// fold (add (select cc, 0, c), x) -> (select cc, x, (add, x, c))
if (N0.getOpcode() == ISD::SELECT && N0.getNode()->hasOneUse()) {
SDValue Result = combineSelectAndUse(N, N0, N1, DCI);
if (Result.getNode()) return Result;
}
if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
if (Result.getNode()) return Result;
}
return SDValue();
}
/// PerformADDCombine - Target-specific dag combine xforms for ISD::ADD.
///
static SDValue PerformADDCombine(SDNode *N,
TargetLowering::DAGCombinerInfo &DCI) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
// First try with the default operand order.
SDValue Result = PerformADDCombineWithOperands(N, N0, N1, DCI);
if (Result.getNode())
return Result;
// If that didn't work, try again with the operands commuted.
return PerformADDCombineWithOperands(N, N1, N0, DCI);
}
/// PerformSUBCombine - Target-specific dag combine xforms for ISD::SUB.
///
static SDValue PerformSUBCombine(SDNode *N,
TargetLowering::DAGCombinerInfo &DCI) {
// added by evan in r37685 with no testcase.
SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
// fold (sub x, (select cc, 0, c)) -> (select cc, x, (sub, x, c))
if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {