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[X86][SSE] Move setTargetShuffleZeroElements closer to getTargetShuffleMask. NFCI.

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Keep target shuffle mask helper functions closer together.

llvm-svn: 259034
This commit is contained in:
Simon Pilgrim 2016-01-28 09:45:01 +00:00
parent 16a6e05403
commit ce341aeb08
1 changed files with 47 additions and 46 deletions
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93
lib/Target/X86/X86ISelLowering.cpp
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@ -5107,6 +5107,53 @@ static bool getTargetShuffleMask(SDNode *N, MVT VT, bool AllowSentinelZero,
return true;
}
/// Check a target shuffle mask's inputs to see if we can set any values to
/// SM_SentinelZero - this is for elements that are known to be zero
/// (not just zeroable) from their inputs.
/// Returns true if the target shuffle mask was decoded.
static bool setTargetShuffleZeroElements(SDValue N,
SmallVectorImpl<int> &Mask) {
bool IsUnary;
if (!isTargetShuffle(N.getOpcode()))
return false;
if (!getTargetShuffleMask(N.getNode(), N.getSimpleValueType(), true, Mask,
IsUnary))
return false;
SDValue V1 = N.getOperand(0);
SDValue V2 = IsUnary ? V1 : N.getOperand(1);
while (V1.getOpcode() == ISD::BITCAST)
V1 = V1->getOperand(0);
while (V2.getOpcode() == ISD::BITCAST)
V2 = V2->getOperand(0);
for (int i = 0, Size = Mask.size(); i != Size; ++i) {
int M = Mask[i];
// Already decoded as SM_SentinelZero / SM_SentinelUndef.
if (M < 0)
continue;
SDValue V = M < Size ? V1 : V2;
// We are referencing an UNDEF input.
if (V.isUndef()) {
Mask[i] = SM_SentinelUndef;
continue;
}
// TODO - handle the Size != (int)V.getNumOperands() cases in future.
if (V.getOpcode() != ISD::BUILD_VECTOR || Size != (int)V.getNumOperands())
continue;
if (!X86::isZeroNode(V.getOperand(M % Size)))
continue;
Mask[i] = SM_SentinelZero;
}
return true;
}
/// Returns the scalar element that will make up the ith
/// element of the result of the vector shuffle.
static SDValue getShuffleScalarElt(SDNode *N, unsigned Index, SelectionDAG &DAG,
@ -23838,52 +23885,6 @@ static bool combineRedundantHalfShuffle(SDValue N, MutableArrayRef<int> Mask,
return true;
}
/// Check a target shuffle mask's inputs to see if we can set any values to
/// SM_SentinelZero - this is for elements that are known to be zero
/// (not just zeroable) from their inputs.
static bool setTargetShuffleZeroElements(SDValue N,
SmallVectorImpl<int> &Mask) {
bool IsUnary;
if (!isTargetShuffle(N.getOpcode()))
return false;
if (!getTargetShuffleMask(N.getNode(), N.getSimpleValueType(), true, Mask,
IsUnary))
return false;
SDValue V1 = N.getOperand(0);
SDValue V2 = IsUnary ? V1 : N.getOperand(1);
while (V1.getOpcode() == ISD::BITCAST)
V1 = V1->getOperand(0);
while (V2.getOpcode() == ISD::BITCAST)
V2 = V2->getOperand(0);
for (int i = 0, Size = Mask.size(); i != Size; ++i) {
int M = Mask[i];
// Already decoded as SM_SentinelZero / SM_SentinelUndef.
if (M < 0)
continue;
SDValue V = M < Size ? V1 : V2;
// We are referencing an UNDEF input.
if (V.isUndef()) {
Mask[i] = SM_SentinelUndef;
continue;
}
// TODO - handle the Size != (int)V.getNumOperands() cases in future.
if (V.getOpcode() != ISD::BUILD_VECTOR || Size != (int)V.getNumOperands())
continue;
if (!X86::isZeroNode(V.getOperand(M % Size)))
continue;
Mask[i] = SM_SentinelZero;
}
return true;
}
/// \brief Try to combine x86 target specific shuffles.
static SDValue PerformTargetShuffleCombine(SDValue N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,