RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-12-13 22:58:50 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

[X86][SSE] splitAndLowerShuffle - use splitVector helper. NFC.

Browse Source 
The splitVector helper uses extractSubVector which splits build vectors like we do here, so avoid reimplementing it.

splitVector could easily be extended to peek through bitcasts as well but I'd prefer to keep this commit NFC.
This commit is contained in:
Simon Pilgrim 2020-05-03 10:48:28 +01:00
parent 5a6c85dd43
commit 44fc5dc70d
1 changed files with 4 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
lib/Target/X86/X86ISelLowering.cpp
View File

@ -15138,37 +15138,13 @@ static SDValue splitAndLowerShuffle(const SDLoc &DL, MVT VT, SDValue V1,
int NumElements = VT.getVectorNumElements();
int SplitNumElements = NumElements / 2;
MVT ScalarVT = VT.getVectorElementType();
MVT SplitVT = MVT::getVectorVT(ScalarVT, NumElements / 2);
MVT SplitVT = MVT::getVectorVT(ScalarVT, SplitNumElements);
// Rather than splitting build-vectors, just build two narrower build
// vectors. This helps shuffling with splats and zeros.
// Use splitVector/extractSubVector so that split build-vectors just build two
// narrower build vectors. This helps shuffling with splats and zeros.
auto SplitVector = [&](SDValue V) {
V = peekThroughBitcasts(V);
MVT OrigVT = V.getSimpleValueType();
int OrigNumElements = OrigVT.getVectorNumElements();
int OrigSplitNumElements = OrigNumElements / 2;
MVT OrigScalarVT = OrigVT.getVectorElementType();
MVT OrigSplitVT = MVT::getVectorVT(OrigScalarVT, OrigNumElements / 2);
SDValue LoV, HiV;
auto *BV = dyn_cast<BuildVectorSDNode>(V);
if (!BV) {
LoV = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, OrigSplitVT, V,
DAG.getIntPtrConstant(0, DL));
HiV = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, OrigSplitVT, V,
DAG.getIntPtrConstant(OrigSplitNumElements, DL));
} else {
SmallVector<SDValue, 16> LoOps, HiOps;
for (int i = 0; i < OrigSplitNumElements; ++i) {
LoOps.push_back(BV->getOperand(i));
HiOps.push_back(BV->getOperand(i + OrigSplitNumElements));
}
LoV = DAG.getBuildVector(OrigSplitVT, DL, LoOps);
HiV = DAG.getBuildVector(OrigSplitVT, DL, HiOps);
}
std::tie(LoV, HiV) = splitVector(peekThroughBitcasts(V), DAG, DL);
return std::make_pair(DAG.getBitcast(SplitVT, LoV),
DAG.getBitcast(SplitVT, HiV));
};