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More movsldup/movshdup cleanup. Rewrite the mask matching function and add

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support for 256-bit versions (but no instruction selection yet, coming next).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136050 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes 2011-07-26 02:39:28 +00:00
parent 5f6c440e53
commit 9123c6fea0
2 changed files with 44 additions and 37 deletions
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77
lib/Target/X86/X86ISelLowering.cpp
View File

@ -3457,51 +3457,58 @@ static bool isCommutedMOVL(ShuffleVectorSDNode *N, bool V2IsSplat = false,
/// isMOVSHDUPMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to MOVSHDUP.
bool X86::isMOVSHDUPMask(ShuffleVectorSDNode *N) {
if (N->getValueType(0).getVectorNumElements() != 4)
/// Masks to match: <1, 1, 3, 3> or <1, 1, 3, 3, 5, 5, 7, 7>
bool X86::isMOVSHDUPMask(ShuffleVectorSDNode *N,
const X86Subtarget *Subtarget) {
if (!Subtarget->hasSSE3() && !Subtarget->hasAVX())
return false;
// Expect 1, 1, 3, 3
for (unsigned i = 0; i < 2; ++i) {
int Elt = N->getMaskElt(i);
if (Elt >= 0 && Elt != 1)
return false;
}
// The second vector must be undef
if (N->getOperand(1).getOpcode() != ISD::UNDEF)
return false;
bool HasHi = false;
for (unsigned i = 2; i < 4; ++i) {
int Elt = N->getMaskElt(i);
if (Elt >= 0 && Elt != 3)
EVT VT = N->getValueType(0);
unsigned NumElems = VT.getVectorNumElements();
if ((VT.getSizeInBits() == 128 && NumElems != 4) ||
(VT.getSizeInBits() == 256 && NumElems != 8))
return false;
// "i+1" is the value the indexed mask element must have
for (unsigned i = 0; i < NumElems; i += 2)
if (!isUndefOrEqual(N->getMaskElt(i), i+1) ||
!isUndefOrEqual(N->getMaskElt(i+1), i+1))
return false;
if (Elt == 3)
HasHi = true;
}
// Don't use movshdup if it can be done with a shufps.
// FIXME: verify that matching u, u, 3, 3 is what we want.
return HasHi;
return true;
}
/// isMOVSLDUPMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to MOVSLDUP.
bool X86::isMOVSLDUPMask(ShuffleVectorSDNode *N) {
if (N->getValueType(0).getVectorNumElements() != 4)
/// Masks to match: <0, 0, 2, 2> or <0, 0, 2, 2, 4, 4, 6, 6>
bool X86::isMOVSLDUPMask(ShuffleVectorSDNode *N,
const X86Subtarget *Subtarget) {
if (!Subtarget->hasSSE3() && !Subtarget->hasAVX())
return false;
// Expect 0, 0, 2, 2
for (unsigned i = 0; i < 2; ++i)
if (N->getMaskElt(i) > 0)
// The second vector must be undef
if (N->getOperand(1).getOpcode() != ISD::UNDEF)
return false;
EVT VT = N->getValueType(0);
unsigned NumElems = VT.getVectorNumElements();
if ((VT.getSizeInBits() == 128 && NumElems != 4) ||
(VT.getSizeInBits() == 256 && NumElems != 8))
return false;
// "i" is the value the indexed mask element must have
for (unsigned i = 0; i < NumElems; i += 2)
if (!isUndefOrEqual(N->getMaskElt(i), i) ||
!isUndefOrEqual(N->getMaskElt(i+1), i))
return false;
bool HasHi = false;
for (unsigned i = 2; i < 4; ++i) {
int Elt = N->getMaskElt(i);
if (Elt >= 0 && Elt != 2)
return false;
if (Elt == 2)
HasHi = true;
}
// Don't use movsldup if it can be done with a shufps.
return HasHi;
return true;
}
/// isMOVDDUPMask - Return true if the specified VECTOR_SHUFFLE operand
@ -5942,10 +5949,10 @@ X86TargetLowering::LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const {
if (X86::isMOVHLPSMask(SVOp))
return getMOVHighToLow(Op, dl, DAG);
if (X86::isMOVSHDUPMask(SVOp) && HasSSE3 && V2IsUndef && NumElems == 4)
if (X86::isMOVSHDUPMask(SVOp, Subtarget))
return getTargetShuffleNode(X86ISD::MOVSHDUP, dl, VT, V1, DAG);
if (X86::isMOVSLDUPMask(SVOp) && HasSSE3 && V2IsUndef && NumElems == 4)
if (X86::isMOVSLDUPMask(SVOp, Subtarget))
return getTargetShuffleNode(X86ISD::MOVSLDUP, dl, VT, V1, DAG);
if (X86::isMOVLPMask(SVOp))

4
lib/Target/X86/X86ISelLowering.h
View File

@ -406,11 +406,11 @@ namespace llvm {
/// isMOVSHDUPMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to MOVSHDUP.
bool isMOVSHDUPMask(ShuffleVectorSDNode *N);
bool isMOVSHDUPMask(ShuffleVectorSDNode *N, const X86Subtarget *Subtarget);
/// isMOVSLDUPMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to MOVSLDUP.
bool isMOVSLDUPMask(ShuffleVectorSDNode *N);
bool isMOVSLDUPMask(ShuffleVectorSDNode *N, const X86Subtarget *Subtarget);
/// isMOVDDUPMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to MOVDDUP.