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Remove unnecessary type check when combining and/or/xor of swizzles. Move some checks to allow better early out.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154309 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2012-04-09 07:19:09 +00:00
parent b7135e5838
commit f920423ffc
1 changed files with 12 additions and 13 deletions
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25
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -2361,18 +2361,16 @@ SDValue DAGCombiner::SimplifyBinOpWithSameOpcodeHands(SDNode *N) {
// The type-legalizer generates this pattern when loading illegal
// vector types from memory. In many cases this allows additional shuffle
// optimizations.
if (N0.getOpcode() == ISD::VECTOR_SHUFFLE && Level < AfterLegalizeDAG) {
if (N0.getOpcode() == ISD::VECTOR_SHUFFLE && Level < AfterLegalizeDAG &&
N0.getOperand(1).getOpcode() == ISD::UNDEF &&
N1.getOperand(1).getOpcode() == ISD::UNDEF) {
ShuffleVectorSDNode *SVN0 = cast<ShuffleVectorSDNode>(N0);
ShuffleVectorSDNode *SVN1 = cast<ShuffleVectorSDNode>(N1);
SDValue In0 = SVN0->getOperand(0);
SDValue In1 = SVN1->getOperand(0);
EVT In0Ty = In0.getValueType();
EVT In1Ty = In1.getValueType();
assert(N0.getOperand(0).getValueType() == N1.getOperand(1).getValueType() &&
"Inputs to shuffles are not the same type");
unsigned NumElts = VT.getVectorNumElements();
// Check that both shuffles are swizzles.
bool SingleVecShuff = (N0.getOperand(1).getOpcode() == ISD::UNDEF &&
N1.getOperand(1).getOpcode() == ISD::UNDEF);
// Check that both shuffles use the same mask. The masks are known to be of
// the same length because the result vector type is the same.
@ -2386,14 +2384,15 @@ SDValue DAGCombiner::SimplifyBinOpWithSameOpcodeHands(SDNode *N) {
}
}
if (SameMask && SingleVecShuff && In0Ty == In1Ty) {
SDValue Op = DAG.getNode(N->getOpcode(), N->getDebugLoc(), VT, In0, In1);
SDValue Shuff = DAG.getVectorShuffle(VT, N->getDebugLoc(), Op,
DAG.getUNDEF(VT), &SVN0->getMask()[0]);
if (SameMask) {
SDValue Op = DAG.getNode(N->getOpcode(), N->getDebugLoc(), VT,
N0.getOperand(0), N1.getOperand(0));
AddToWorkList(Op.getNode());
return Shuff;
return DAG.getVectorShuffle(VT, N->getDebugLoc(), Op,
DAG.getUNDEF(VT), &SVN0->getMask()[0]);
}
}
return SDValue();
}