diff options
Diffstat (limited to 'lib/Target/ARM/ARMISelLowering.cpp')
| -rw-r--r-- | lib/Target/ARM/ARMISelLowering.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp index 5d24e92..514971f 100644 --- a/lib/Target/ARM/ARMISelLowering.cpp +++ b/lib/Target/ARM/ARMISelLowering.cpp @@ -4452,8 +4452,11 @@ SDValue ARMTargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG, // If we are VDUPing a value that comes directly from a vector, that will // cause an unnecessary move to and from a GPR, where instead we could - // just use VDUPLANE. - if (Value->getOpcode() == ISD::EXTRACT_VECTOR_ELT) { + // just use VDUPLANE. We can only do this if the lane being extracted + // is at a constant index, as the VDUP from lane instructions only have + // constant-index forms. + if (Value->getOpcode() == ISD::EXTRACT_VECTOR_ELT && + isa<ConstantSDNode>(Value->getOperand(1))) { // We need to create a new undef vector to use for the VDUPLANE if the // size of the vector from which we get the value is different than the // size of the vector that we need to create. We will insert the element |