diff options
Diffstat (limited to 'lib/Target/ARM/ARMISelLowering.cpp')
| -rw-r--r-- | lib/Target/ARM/ARMISelLowering.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp index 88649ab2be..41a597a00f 100644 --- a/lib/Target/ARM/ARMISelLowering.cpp +++ b/lib/Target/ARM/ARMISelLowering.cpp @@ -2735,6 +2735,9 @@ static SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) { if (ShuffleVectorSDNode::isSplatMask(&ShuffleMask[0], VT)) { int Lane = SVN->getSplatIndex(); + // If this is undef splat, generate it via "just" vdup, if possible. + if (Lane == -1) Lane = 0; + if (Lane == 0 && V1.getOpcode() == ISD::SCALAR_TO_VECTOR) { return DAG.getNode(ARMISD::VDUP, dl, VT, V1.getOperand(0)); } |