diff options
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 30 |
1 files changed, 17 insertions, 13 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 1eaa51e00f..248393b899 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -3274,22 +3274,26 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) { return DAG.getNode(ISD::VECTOR_SHUFFLE, VT, V[0], V[1], ShufMask); } - // Expand into a number of unpckl*. - // e.g. for v4f32 - // Step 1: unpcklps 0, 2 ==> X: <?, ?, 2, 0> - // : unpcklps 1, 3 ==> Y: <?, ?, 3, 1> - // Step 2: unpcklps X, Y ==> <3, 2, 1, 0> - SDOperand UnpckMask = getUnpacklMask(NumElems, DAG); - for (unsigned i = 0; i < NumElems; ++i) - V[i] = DAG.getNode(ISD::SCALAR_TO_VECTOR, VT, Op.getOperand(i)); - NumElems >>= 1; - while (NumElems != 0) { + if (Values.size() > 2) { + // Expand into a number of unpckl*. + // e.g. for v4f32 + // Step 1: unpcklps 0, 2 ==> X: <?, ?, 2, 0> + // : unpcklps 1, 3 ==> Y: <?, ?, 3, 1> + // Step 2: unpcklps X, Y ==> <3, 2, 1, 0> + SDOperand UnpckMask = getUnpacklMask(NumElems, DAG); for (unsigned i = 0; i < NumElems; ++i) - V[i] = DAG.getNode(ISD::VECTOR_SHUFFLE, VT, V[i], V[i + NumElems], - UnpckMask); + V[i] = DAG.getNode(ISD::SCALAR_TO_VECTOR, VT, Op.getOperand(i)); NumElems >>= 1; + while (NumElems != 0) { + for (unsigned i = 0; i < NumElems; ++i) + V[i] = DAG.getNode(ISD::VECTOR_SHUFFLE, VT, V[i], V[i + NumElems], + UnpckMask); + NumElems >>= 1; + } + return V[0]; } - return V[0]; + + return SDOperand(); } case ISD::EXTRACT_VECTOR_ELT: { if (!isa<ConstantSDNode>(Op.getOperand(1))) |