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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2019-01-31 14:04:07 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2019-01-31 14:04:07 +0000 |
| commit | 63f3383ece25efa625eab4d0cd75b4225a3f034c (patch) | |
| tree | 2516c1fb102104328d39ce3a1c9e374ab7197671 /llvm/lib/Target | |
| parent | 140f75f625bc815c5c7c73a6ba765d49998f95c4 (diff) | |
| download | bcm5719-llvm-63f3383ece25efa625eab4d0cd75b4225a3f034c.tar.gz bcm5719-llvm-63f3383ece25efa625eab4d0cd75b4225a3f034c.zip | |
[X86][AVX] Fold broadcast(bitcast(src)) -> bitcast(broadcast(src))
llvm-svn: 352751
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index cb5dce233f7..9bc3d482074 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -31938,6 +31938,14 @@ static SDValue combineTargetShuffle(SDValue N, SelectionDAG &DAG, return DAG.getNode(X86ISD::VBROADCAST, DL, VT, DAG.getBitcast(SrcVT, Res)); } + // broadcast(bitcast(src)) -> bitcast(broadcast(src)) + // 32-bit targets have to bitcast i64 to f64, so better to bitcast upward. + if (Src.getOpcode() == ISD::BITCAST && + SrcVT.getScalarSizeInBits() == BCVT.getScalarSizeInBits()) { + EVT NewVT = EVT::getVectorVT(*DAG.getContext(), BCVT.getScalarType(), + VT.getVectorNumElements()); + return DAG.getBitcast(VT, DAG.getNode(X86ISD::VBROADCAST, DL, NewVT, BC)); + } return SDValue(); } case X86ISD::PSHUFD: |
