diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index a10023df8a0..abc80351ec4 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -10416,6 +10416,13 @@ static SDValue LowerVSELECTtoBlend(SDValue Op, const X86Subtarget *Subtarget, } SDValue X86TargetLowering::LowerVSELECT(SDValue Op, SelectionDAG &DAG) const { + // A vselect where all conditions and data are constants can be optimized into + // a single vector load by SelectionDAGLegalize::ExpandBUILD_VECTOR(). + if (ISD::isBuildVectorOfConstantSDNodes(Op.getOperand(0).getNode()) && + ISD::isBuildVectorOfConstantSDNodes(Op.getOperand(1).getNode()) && + ISD::isBuildVectorOfConstantSDNodes(Op.getOperand(2).getNode())) + return SDValue(); + SDValue BlendOp = LowerVSELECTtoBlend(Op, Subtarget, DAG); if (BlendOp.getNode()) return BlendOp; @@ -20419,6 +20426,12 @@ TransformVSELECTtoBlendVECTOR_SHUFFLE(SDNode *N, SelectionDAG &DAG, if (!ISD::isBuildVectorOfConstantSDNodes(Cond.getNode())) return SDValue(); + // A vselect where all conditions and data are constants can be optimized into + // a single vector load by SelectionDAGLegalize::ExpandBUILD_VECTOR(). + if (ISD::isBuildVectorOfConstantSDNodes(LHS.getNode()) && + ISD::isBuildVectorOfConstantSDNodes(RHS.getNode())) + return SDValue(); + unsigned MaskValue = 0; if (!BUILD_VECTORtoBlendMask(cast<BuildVectorSDNode>(Cond), MaskValue)) return SDValue(); |
