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-rw-r--r--llvm/lib/Target/X86/MCTargetDesc/X86ShuffleDecode.cpp571
1 files changed, 571 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/MCTargetDesc/X86ShuffleDecode.cpp b/llvm/lib/Target/X86/MCTargetDesc/X86ShuffleDecode.cpp
new file mode 100644
index 0000000000000..62c1c399a606e
--- /dev/null
+++ b/llvm/lib/Target/X86/MCTargetDesc/X86ShuffleDecode.cpp
@@ -0,0 +1,571 @@
+//===-- X86ShuffleDecode.cpp - X86 shuffle decode logic -------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Define several functions to decode x86 specific shuffle semantics into a
+// generic vector mask.
+//
+//===----------------------------------------------------------------------===//
+
+#include "X86ShuffleDecode.h"
+#include "llvm/ADT/APInt.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallVector.h"
+
+//===----------------------------------------------------------------------===//
+// Vector Mask Decoding
+//===----------------------------------------------------------------------===//
+
+namespace llvm {
+
+void DecodeINSERTPSMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
+ // Defaults the copying the dest value.
+ ShuffleMask.push_back(0);
+ ShuffleMask.push_back(1);
+ ShuffleMask.push_back(2);
+ ShuffleMask.push_back(3);
+
+ // Decode the immediate.
+ unsigned ZMask = Imm & 15;
+ unsigned CountD = (Imm >> 4) & 3;
+ unsigned CountS = (Imm >> 6) & 3;
+
+ // CountS selects which input element to use.
+ unsigned InVal = 4 + CountS;
+ // CountD specifies which element of destination to update.
+ ShuffleMask[CountD] = InVal;
+ // ZMask zaps values, potentially overriding the CountD elt.
+ if (ZMask & 1) ShuffleMask[0] = SM_SentinelZero;
+ if (ZMask & 2) ShuffleMask[1] = SM_SentinelZero;
+ if (ZMask & 4) ShuffleMask[2] = SM_SentinelZero;
+ if (ZMask & 8) ShuffleMask[3] = SM_SentinelZero;
+}
+
+void DecodeInsertElementMask(unsigned NumElts, unsigned Idx, unsigned Len,
+ SmallVectorImpl<int> &ShuffleMask) {
+ assert((Idx + Len) <= NumElts && "Insertion out of range");
+
+ for (unsigned i = 0; i != NumElts; ++i)
+ ShuffleMask.push_back(i);
+ for (unsigned i = 0; i != Len; ++i)
+ ShuffleMask[Idx + i] = NumElts + i;
+}
+
+// <3,1> or <6,7,2,3>
+void DecodeMOVHLPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask) {
+ for (unsigned i = NElts / 2; i != NElts; ++i)
+ ShuffleMask.push_back(NElts + i);
+
+ for (unsigned i = NElts / 2; i != NElts; ++i)
+ ShuffleMask.push_back(i);
+}
+
+// <0,2> or <0,1,4,5>
+void DecodeMOVLHPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask) {
+ for (unsigned i = 0; i != NElts / 2; ++i)
+ ShuffleMask.push_back(i);
+
+ for (unsigned i = 0; i != NElts / 2; ++i)
+ ShuffleMask.push_back(NElts + i);
+}
+
+void DecodeMOVSLDUPMask(unsigned NumElts, SmallVectorImpl<int> &ShuffleMask) {
+ for (int i = 0, e = NumElts / 2; i < e; ++i) {
+ ShuffleMask.push_back(2 * i);
+ ShuffleMask.push_back(2 * i);
+ }
+}
+
+void DecodeMOVSHDUPMask(unsigned NumElts, SmallVectorImpl<int> &ShuffleMask) {
+ for (int i = 0, e = NumElts / 2; i < e; ++i) {
+ ShuffleMask.push_back(2 * i + 1);
+ ShuffleMask.push_back(2 * i + 1);
+ }
+}
+
+void DecodeMOVDDUPMask(unsigned NumElts, SmallVectorImpl<int> &ShuffleMask) {
+ const unsigned NumLaneElts = 2;
+
+ for (unsigned l = 0; l < NumElts; l += NumLaneElts)
+ for (unsigned i = 0; i < NumLaneElts; ++i)
+ ShuffleMask.push_back(l);
+}
+
+void DecodePSLLDQMask(unsigned NumElts, unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ const unsigned NumLaneElts = 16;
+
+ for (unsigned l = 0; l < NumElts; l += NumLaneElts)
+ for (unsigned i = 0; i < NumLaneElts; ++i) {
+ int M = SM_SentinelZero;
+ if (i >= Imm) M = i - Imm + l;
+ ShuffleMask.push_back(M);
+ }
+}
+
+void DecodePSRLDQMask(unsigned NumElts, unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ const unsigned NumLaneElts = 16;
+
+ for (unsigned l = 0; l < NumElts; l += NumLaneElts)
+ for (unsigned i = 0; i < NumLaneElts; ++i) {
+ unsigned Base = i + Imm;
+ int M = Base + l;
+ if (Base >= NumLaneElts) M = SM_SentinelZero;
+ ShuffleMask.push_back(M);
+ }
+}
+
+void DecodePALIGNRMask(unsigned NumElts, unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ const unsigned NumLaneElts = 16;
+
+ for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
+ for (unsigned i = 0; i != NumLaneElts; ++i) {
+ unsigned Base = i + Imm;
+ // if i+imm is out of this lane then we actually need the other source
+ if (Base >= NumLaneElts) Base += NumElts - NumLaneElts;
+ ShuffleMask.push_back(Base + l);
+ }
+ }
+}
+
+void DecodeVALIGNMask(unsigned NumElts, unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ // Not all bits of the immediate are used so mask it.
+ assert(isPowerOf2_32(NumElts) && "NumElts should be power of 2");
+ Imm = Imm & (NumElts - 1);
+ for (unsigned i = 0; i != NumElts; ++i)
+ ShuffleMask.push_back(i + Imm);
+}
+
+void DecodePSHUFMask(unsigned NumElts, unsigned ScalarBits, unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ unsigned Size = NumElts * ScalarBits;
+ unsigned NumLanes = Size / 128;
+ if (NumLanes == 0) NumLanes = 1; // Handle MMX
+ unsigned NumLaneElts = NumElts / NumLanes;
+
+ uint32_t SplatImm = (Imm & 0xff) * 0x01010101;
+ for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
+ for (unsigned i = 0; i != NumLaneElts; ++i) {
+ ShuffleMask.push_back(SplatImm % NumLaneElts + l);
+ SplatImm /= NumLaneElts;
+ }
+ }
+}
+
+void DecodePSHUFHWMask(unsigned NumElts, unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ for (unsigned l = 0; l != NumElts; l += 8) {
+ unsigned NewImm = Imm;
+ for (unsigned i = 0, e = 4; i != e; ++i) {
+ ShuffleMask.push_back(l + i);
+ }
+ for (unsigned i = 4, e = 8; i != e; ++i) {
+ ShuffleMask.push_back(l + 4 + (NewImm & 3));
+ NewImm >>= 2;
+ }
+ }
+}
+
+void DecodePSHUFLWMask(unsigned NumElts, unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ for (unsigned l = 0; l != NumElts; l += 8) {
+ unsigned NewImm = Imm;
+ for (unsigned i = 0, e = 4; i != e; ++i) {
+ ShuffleMask.push_back(l + (NewImm & 3));
+ NewImm >>= 2;
+ }
+ for (unsigned i = 4, e = 8; i != e; ++i) {
+ ShuffleMask.push_back(l + i);
+ }
+ }
+}
+
+void DecodePSWAPMask(unsigned NumElts, SmallVectorImpl<int> &ShuffleMask) {
+ unsigned NumHalfElts = NumElts / 2;
+
+ for (unsigned l = 0; l != NumHalfElts; ++l)
+ ShuffleMask.push_back(l + NumHalfElts);
+ for (unsigned h = 0; h != NumHalfElts; ++h)
+ ShuffleMask.push_back(h);
+}
+
+void DecodeSHUFPMask(unsigned NumElts, unsigned ScalarBits,
+ unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
+ unsigned NumLaneElts = 128 / ScalarBits;
+
+ unsigned NewImm = Imm;
+ for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
+ // each half of a lane comes from different source
+ for (unsigned s = 0; s != NumElts * 2; s += NumElts) {
+ for (unsigned i = 0; i != NumLaneElts / 2; ++i) {
+ ShuffleMask.push_back(NewImm % NumLaneElts + s + l);
+ NewImm /= NumLaneElts;
+ }
+ }
+ if (NumLaneElts == 4) NewImm = Imm; // reload imm
+ }
+}
+
+void DecodeUNPCKHMask(unsigned NumElts, unsigned ScalarBits,
+ SmallVectorImpl<int> &ShuffleMask) {
+ // Handle 128 and 256-bit vector lengths. AVX defines UNPCK* to operate
+ // independently on 128-bit lanes.
+ unsigned NumLanes = (NumElts * ScalarBits) / 128;
+ if (NumLanes == 0) NumLanes = 1; // Handle MMX
+ unsigned NumLaneElts = NumElts / NumLanes;
+
+ for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
+ for (unsigned i = l + NumLaneElts / 2, e = l + NumLaneElts; i != e; ++i) {
+ ShuffleMask.push_back(i); // Reads from dest/src1
+ ShuffleMask.push_back(i + NumElts); // Reads from src/src2
+ }
+ }
+}
+
+void DecodeUNPCKLMask(unsigned NumElts, unsigned ScalarBits,
+ SmallVectorImpl<int> &ShuffleMask) {
+ // Handle 128 and 256-bit vector lengths. AVX defines UNPCK* to operate
+ // independently on 128-bit lanes.
+ unsigned NumLanes = (NumElts * ScalarBits) / 128;
+ if (NumLanes == 0 ) NumLanes = 1; // Handle MMX
+ unsigned NumLaneElts = NumElts / NumLanes;
+
+ for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
+ for (unsigned i = l, e = l + NumLaneElts / 2; i != e; ++i) {
+ ShuffleMask.push_back(i); // Reads from dest/src1
+ ShuffleMask.push_back(i + NumElts); // Reads from src/src2
+ }
+ }
+}
+
+void DecodeVectorBroadcast(unsigned NumElts,
+ SmallVectorImpl<int> &ShuffleMask) {
+ ShuffleMask.append(NumElts, 0);
+}
+
+void DecodeSubVectorBroadcast(unsigned DstNumElts, unsigned SrcNumElts,
+ SmallVectorImpl<int> &ShuffleMask) {
+ unsigned Scale = DstNumElts / SrcNumElts;
+
+ for (unsigned i = 0; i != Scale; ++i)
+ for (unsigned j = 0; j != SrcNumElts; ++j)
+ ShuffleMask.push_back(j);
+}
+
+void decodeVSHUF64x2FamilyMask(unsigned NumElts, unsigned ScalarSize,
+ unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ unsigned NumElementsInLane = 128 / ScalarSize;
+ unsigned NumLanes = NumElts / NumElementsInLane;
+
+ for (unsigned l = 0; l != NumElts; l += NumElementsInLane) {
+ unsigned Index = (Imm % NumLanes) * NumElementsInLane;
+ Imm /= NumLanes; // Discard the bits we just used.
+ // We actually need the other source.
+ if (l >= (NumElts / 2))
+ Index += NumElts;
+ for (unsigned i = 0; i != NumElementsInLane; ++i)
+ ShuffleMask.push_back(Index + i);
+ }
+}
+
+void DecodeVPERM2X128Mask(unsigned NumElts, unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ unsigned HalfSize = NumElts / 2;
+
+ for (unsigned l = 0; l != 2; ++l) {
+ unsigned HalfMask = Imm >> (l * 4);
+ unsigned HalfBegin = (HalfMask & 0x3) * HalfSize;
+ for (unsigned i = HalfBegin, e = HalfBegin + HalfSize; i != e; ++i)
+ ShuffleMask.push_back((HalfMask & 8) ? SM_SentinelZero : (int)i);
+ }
+}
+
+void DecodePSHUFBMask(ArrayRef<uint64_t> RawMask, const APInt &UndefElts,
+ SmallVectorImpl<int> &ShuffleMask) {
+ for (int i = 0, e = RawMask.size(); i < e; ++i) {
+ uint64_t M = RawMask[i];
+ if (UndefElts[i]) {
+ ShuffleMask.push_back(SM_SentinelUndef);
+ continue;
+ }
+ // For 256/512-bit vectors the base of the shuffle is the 128-bit
+ // subvector we're inside.
+ int Base = (i / 16) * 16;
+ // If the high bit (7) of the byte is set, the element is zeroed.
+ if (M & (1 << 7))
+ ShuffleMask.push_back(SM_SentinelZero);
+ else {
+ // Only the least significant 4 bits of the byte are used.
+ int Index = Base + (M & 0xf);
+ ShuffleMask.push_back(Index);
+ }
+ }
+}
+
+void DecodeBLENDMask(unsigned NumElts, unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ for (unsigned i = 0; i < NumElts; ++i) {
+ // If there are more than 8 elements in the vector, then any immediate blend
+ // mask wraps around.
+ unsigned Bit = i % 8;
+ ShuffleMask.push_back(((Imm >> Bit) & 1) ? NumElts + i : i);
+ }
+}
+
+void DecodeVPPERMMask(ArrayRef<uint64_t> RawMask, const APInt &UndefElts,
+ SmallVectorImpl<int> &ShuffleMask) {
+ assert(RawMask.size() == 16 && "Illegal VPPERM shuffle mask size");
+
+ // VPPERM Operation
+ // Bits[4:0] - Byte Index (0 - 31)
+ // Bits[7:5] - Permute Operation
+ //
+ // Permute Operation:
+ // 0 - Source byte (no logical operation).
+ // 1 - Invert source byte.
+ // 2 - Bit reverse of source byte.
+ // 3 - Bit reverse of inverted source byte.
+ // 4 - 00h (zero - fill).
+ // 5 - FFh (ones - fill).
+ // 6 - Most significant bit of source byte replicated in all bit positions.
+ // 7 - Invert most significant bit of source byte and replicate in all bit positions.
+ for (int i = 0, e = RawMask.size(); i < e; ++i) {
+ if (UndefElts[i]) {
+ ShuffleMask.push_back(SM_SentinelUndef);
+ continue;
+ }
+
+ uint64_t M = RawMask[i];
+ uint64_t PermuteOp = (M >> 5) & 0x7;
+ if (PermuteOp == 4) {
+ ShuffleMask.push_back(SM_SentinelZero);
+ continue;
+ }
+ if (PermuteOp != 0) {
+ ShuffleMask.clear();
+ return;
+ }
+
+ uint64_t Index = M & 0x1F;
+ ShuffleMask.push_back((int)Index);
+ }
+}
+
+void DecodeVPERMMask(unsigned NumElts, unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ for (unsigned l = 0; l != NumElts; l += 4)
+ for (unsigned i = 0; i != 4; ++i)
+ ShuffleMask.push_back(l + ((Imm >> (2 * i)) & 3));
+}
+
+void DecodeZeroExtendMask(unsigned SrcScalarBits, unsigned DstScalarBits,
+ unsigned NumDstElts, bool IsAnyExtend,
+ SmallVectorImpl<int> &ShuffleMask) {
+ unsigned Scale = DstScalarBits / SrcScalarBits;
+ assert(SrcScalarBits < DstScalarBits &&
+ "Expected zero extension mask to increase scalar size");
+
+ int Sentinel = IsAnyExtend ? SM_SentinelUndef : SM_SentinelZero;
+ for (unsigned i = 0; i != NumDstElts; i++) {
+ ShuffleMask.push_back(i);
+ ShuffleMask.append(Scale - 1, Sentinel);
+ }
+}
+
+void DecodeZeroMoveLowMask(unsigned NumElts,
+ SmallVectorImpl<int> &ShuffleMask) {
+ ShuffleMask.push_back(0);
+ ShuffleMask.append(NumElts - 1, SM_SentinelZero);
+}
+
+void DecodeScalarMoveMask(unsigned NumElts, bool IsLoad,
+ SmallVectorImpl<int> &ShuffleMask) {
+ // First element comes from the first element of second source.
+ // Remaining elements: Load zero extends / Move copies from first source.
+ ShuffleMask.push_back(NumElts);
+ for (unsigned i = 1; i < NumElts; i++)
+ ShuffleMask.push_back(IsLoad ? static_cast<int>(SM_SentinelZero) : i);
+}
+
+void DecodeEXTRQIMask(unsigned NumElts, unsigned EltSize, int Len, int Idx,
+ SmallVectorImpl<int> &ShuffleMask) {
+ unsigned HalfElts = NumElts / 2;
+
+ // Only the bottom 6 bits are valid for each immediate.
+ Len &= 0x3F;
+ Idx &= 0x3F;
+
+ // We can only decode this bit extraction instruction as a shuffle if both the
+ // length and index work with whole elements.
+ if (0 != (Len % EltSize) || 0 != (Idx % EltSize))
+ return;
+
+ // A length of zero is equivalent to a bit length of 64.
+ if (Len == 0)
+ Len = 64;
+
+ // If the length + index exceeds the bottom 64 bits the result is undefined.
+ if ((Len + Idx) > 64) {
+ ShuffleMask.append(NumElts, SM_SentinelUndef);
+ return;
+ }
+
+ // Convert index and index to work with elements.
+ Len /= EltSize;
+ Idx /= EltSize;
+
+ // EXTRQ: Extract Len elements starting from Idx. Zero pad the remaining
+ // elements of the lower 64-bits. The upper 64-bits are undefined.
+ for (int i = 0; i != Len; ++i)
+ ShuffleMask.push_back(i + Idx);
+ for (int i = Len; i != (int)HalfElts; ++i)
+ ShuffleMask.push_back(SM_SentinelZero);
+ for (int i = HalfElts; i != (int)NumElts; ++i)
+ ShuffleMask.push_back(SM_SentinelUndef);
+}
+
+void DecodeINSERTQIMask(unsigned NumElts, unsigned EltSize, int Len, int Idx,
+ SmallVectorImpl<int> &ShuffleMask) {
+ unsigned HalfElts = NumElts / 2;
+
+ // Only the bottom 6 bits are valid for each immediate.
+ Len &= 0x3F;
+ Idx &= 0x3F;
+
+ // We can only decode this bit insertion instruction as a shuffle if both the
+ // length and index work with whole elements.
+ if (0 != (Len % EltSize) || 0 != (Idx % EltSize))
+ return;
+
+ // A length of zero is equivalent to a bit length of 64.
+ if (Len == 0)
+ Len = 64;
+
+ // If the length + index exceeds the bottom 64 bits the result is undefined.
+ if ((Len + Idx) > 64) {
+ ShuffleMask.append(NumElts, SM_SentinelUndef);
+ return;
+ }
+
+ // Convert index and index to work with elements.
+ Len /= EltSize;
+ Idx /= EltSize;
+
+ // INSERTQ: Extract lowest Len elements from lower half of second source and
+ // insert over first source starting at Idx element. The upper 64-bits are
+ // undefined.
+ for (int i = 0; i != Idx; ++i)
+ ShuffleMask.push_back(i);
+ for (int i = 0; i != Len; ++i)
+ ShuffleMask.push_back(i + NumElts);
+ for (int i = Idx + Len; i != (int)HalfElts; ++i)
+ ShuffleMask.push_back(i);
+ for (int i = HalfElts; i != (int)NumElts; ++i)
+ ShuffleMask.push_back(SM_SentinelUndef);
+}
+
+void DecodeVPERMILPMask(unsigned NumElts, unsigned ScalarBits,
+ ArrayRef<uint64_t> RawMask, const APInt &UndefElts,
+ SmallVectorImpl<int> &ShuffleMask) {
+ unsigned VecSize = NumElts * ScalarBits;
+ unsigned NumLanes = VecSize / 128;
+ unsigned NumEltsPerLane = NumElts / NumLanes;
+ assert((VecSize == 128 || VecSize == 256 || VecSize == 512) &&
+ "Unexpected vector size");
+ assert((ScalarBits == 32 || ScalarBits == 64) && "Unexpected element size");
+
+ for (unsigned i = 0, e = RawMask.size(); i < e; ++i) {
+ if (UndefElts[i]) {
+ ShuffleMask.push_back(SM_SentinelUndef);
+ continue;
+ }
+ uint64_t M = RawMask[i];
+ M = (ScalarBits == 64 ? ((M >> 1) & 0x1) : (M & 0x3));
+ unsigned LaneOffset = i & ~(NumEltsPerLane - 1);
+ ShuffleMask.push_back((int)(LaneOffset + M));
+ }
+}
+
+void DecodeVPERMIL2PMask(unsigned NumElts, unsigned ScalarBits, unsigned M2Z,
+ ArrayRef<uint64_t> RawMask, const APInt &UndefElts,
+ SmallVectorImpl<int> &ShuffleMask) {
+ unsigned VecSize = NumElts * ScalarBits;
+ unsigned NumLanes = VecSize / 128;
+ unsigned NumEltsPerLane = NumElts / NumLanes;
+ assert((VecSize == 128 || VecSize == 256) && "Unexpected vector size");
+ assert((ScalarBits == 32 || ScalarBits == 64) && "Unexpected element size");
+ assert((NumElts == RawMask.size()) && "Unexpected mask size");
+
+ for (unsigned i = 0, e = RawMask.size(); i < e; ++i) {
+ if (UndefElts[i]) {
+ ShuffleMask.push_back(SM_SentinelUndef);
+ continue;
+ }
+
+ // VPERMIL2 Operation.
+ // Bits[3] - Match Bit.
+ // Bits[2:1] - (Per Lane) PD Shuffle Mask.
+ // Bits[2:0] - (Per Lane) PS Shuffle Mask.
+ uint64_t Selector = RawMask[i];
+ unsigned MatchBit = (Selector >> 3) & 0x1;
+
+ // M2Z[0:1] MatchBit
+ // 0Xb X Source selected by Selector index.
+ // 10b 0 Source selected by Selector index.
+ // 10b 1 Zero.
+ // 11b 0 Zero.
+ // 11b 1 Source selected by Selector index.
+ if ((M2Z & 0x2) != 0 && MatchBit != (M2Z & 0x1)) {
+ ShuffleMask.push_back(SM_SentinelZero);
+ continue;
+ }
+
+ int Index = i & ~(NumEltsPerLane - 1);
+ if (ScalarBits == 64)
+ Index += (Selector >> 1) & 0x1;
+ else
+ Index += Selector & 0x3;
+
+ int Src = (Selector >> 2) & 0x1;
+ Index += Src * NumElts;
+ ShuffleMask.push_back(Index);
+ }
+}
+
+void DecodeVPERMVMask(ArrayRef<uint64_t> RawMask, const APInt &UndefElts,
+ SmallVectorImpl<int> &ShuffleMask) {
+ uint64_t EltMaskSize = RawMask.size() - 1;
+ for (int i = 0, e = RawMask.size(); i != e; ++i) {
+ if (UndefElts[i]) {
+ ShuffleMask.push_back(SM_SentinelUndef);
+ continue;
+ }
+ uint64_t M = RawMask[i];
+ M &= EltMaskSize;
+ ShuffleMask.push_back((int)M);
+ }
+}
+
+void DecodeVPERMV3Mask(ArrayRef<uint64_t> RawMask, const APInt &UndefElts,
+ SmallVectorImpl<int> &ShuffleMask) {
+ uint64_t EltMaskSize = (RawMask.size() * 2) - 1;
+ for (int i = 0, e = RawMask.size(); i != e; ++i) {
+ if (UndefElts[i]) {
+ ShuffleMask.push_back(SM_SentinelUndef);
+ continue;
+ }
+ uint64_t M = RawMask[i];
+ M &= EltMaskSize;
+ ShuffleMask.push_back((int)M);
+ }
+}
+
+} // llvm namespace
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