diff options
Diffstat (limited to 'llvm/lib/Target/X86')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 6c739d8aad6..ac616ffa8ba 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -10078,7 +10078,9 @@ static bool isShuffleEquivalent(SDValue V1, SDValue V2, ArrayRef<int> Mask, /// SM_SentinelZero is accepted as a valid negative index but must match in /// both. static bool isTargetShuffleEquivalent(ArrayRef<int> Mask, - ArrayRef<int> ExpectedMask) { + ArrayRef<int> ExpectedMask, + SDValue V1 = SDValue(), + SDValue V2 = SDValue()) { int Size = Mask.size(); if (Size != (int)ExpectedMask.size()) return false; @@ -10089,9 +10091,25 @@ static bool isTargetShuffleEquivalent(ArrayRef<int> Mask, if (!isUndefOrZeroOrInRange(Mask, 0, 2 * Size)) return false; + // If the values are build vectors, we can look through them to find + // equivalent inputs that make the shuffles equivalent. + auto *BV1 = dyn_cast_or_null<BuildVectorSDNode>(V1); + auto *BV2 = dyn_cast_or_null<BuildVectorSDNode>(V2); + BV1 = ((BV1 && BV1->getNumOperands() != Size) ? nullptr : BV1); + BV2 = ((BV2 && BV2->getNumOperands() != Size) ? nullptr : BV2); + for (int i = 0; i < Size; ++i) { if (Mask[i] == SM_SentinelUndef || Mask[i] == ExpectedMask[i]) continue; + if (0 <= Mask[i] && 0 <= ExpectedMask[i]) { + auto *MaskBV = Mask[i] < Size ? BV1 : BV2; + auto *ExpectedBV = ExpectedMask[i] < Size ? BV1 : BV2; + if (MaskBV && ExpectedBV && + MaskBV->getOperand(Mask[i] % Size) == + ExpectedBV->getOperand(ExpectedMask[i] % Size)) + continue; + } + // TODO - handle SM_Sentinel equivalences. return false; } return true; @@ -10653,14 +10671,14 @@ static bool matchVectorShuffleWithPACK(MVT VT, MVT &SrcVT, SDValue &V1, // Try binary shuffle. SmallVector<int, 32> BinaryMask; createPackShuffleMask(VT, BinaryMask, false); - if (isTargetShuffleEquivalent(TargetMask, BinaryMask)) + if (isTargetShuffleEquivalent(TargetMask, BinaryMask, V1, V2)) if (MatchPACK(V1, V2)) return true; // Try unary shuffle. SmallVector<int, 32> UnaryMask; createPackShuffleMask(VT, UnaryMask, true); - if (isTargetShuffleEquivalent(TargetMask, UnaryMask)) + if (isTargetShuffleEquivalent(TargetMask, UnaryMask, V1)) if (MatchPACK(V1, V1)) return true; |
