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714162bb4f
The non-constant pool version of DecodeVPERMIL2PMask was not offsetting correctly for the second input. I've updated the code to match the implementation in the constant-pool version. Annoyingly this bug was hidden for so long as it's tricky to combine to useful variable shuffle masks that don't become constant-pool entries. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288898 91177308-0d34-0410-b5e6-96231b3b80d8
607 lines
21 KiB
C++
607 lines
21 KiB
C++
//===-- X86ShuffleDecode.cpp - X86 shuffle decode logic -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Define several functions to decode x86 specific shuffle semantics into a
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// generic vector mask.
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//
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//===----------------------------------------------------------------------===//
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#include "X86ShuffleDecode.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/CodeGen/MachineValueType.h"
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//===----------------------------------------------------------------------===//
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// Vector Mask Decoding
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//===----------------------------------------------------------------------===//
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namespace llvm {
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void DecodeINSERTPSMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
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// Defaults the copying the dest value.
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ShuffleMask.push_back(0);
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ShuffleMask.push_back(1);
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ShuffleMask.push_back(2);
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ShuffleMask.push_back(3);
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// Decode the immediate.
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unsigned ZMask = Imm & 15;
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unsigned CountD = (Imm >> 4) & 3;
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unsigned CountS = (Imm >> 6) & 3;
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// CountS selects which input element to use.
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unsigned InVal = 4 + CountS;
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// CountD specifies which element of destination to update.
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ShuffleMask[CountD] = InVal;
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// ZMask zaps values, potentially overriding the CountD elt.
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if (ZMask & 1) ShuffleMask[0] = SM_SentinelZero;
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if (ZMask & 2) ShuffleMask[1] = SM_SentinelZero;
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if (ZMask & 4) ShuffleMask[2] = SM_SentinelZero;
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if (ZMask & 8) ShuffleMask[3] = SM_SentinelZero;
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}
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void DecodeInsertElementMask(MVT VT, unsigned Idx, unsigned Len,
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SmallVectorImpl<int> &ShuffleMask) {
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unsigned NumElts = VT.getVectorNumElements();
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assert((Idx + Len) <= NumElts && "Insertion out of range");
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for (unsigned i = 0; i != NumElts; ++i)
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ShuffleMask.push_back(i);
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for (unsigned i = 0; i != Len; ++i)
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ShuffleMask[Idx + i] = NumElts + i;
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}
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// <3,1> or <6,7,2,3>
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void DecodeMOVHLPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask) {
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for (unsigned i = NElts / 2; i != NElts; ++i)
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ShuffleMask.push_back(NElts + i);
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for (unsigned i = NElts / 2; i != NElts; ++i)
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ShuffleMask.push_back(i);
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}
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// <0,2> or <0,1,4,5>
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void DecodeMOVLHPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask) {
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for (unsigned i = 0; i != NElts / 2; ++i)
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ShuffleMask.push_back(i);
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for (unsigned i = 0; i != NElts / 2; ++i)
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ShuffleMask.push_back(NElts + i);
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}
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void DecodeMOVSLDUPMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {
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unsigned NumElts = VT.getVectorNumElements();
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for (int i = 0, e = NumElts / 2; i < e; ++i) {
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ShuffleMask.push_back(2 * i);
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ShuffleMask.push_back(2 * i);
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}
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}
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void DecodeMOVSHDUPMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {
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unsigned NumElts = VT.getVectorNumElements();
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for (int i = 0, e = NumElts / 2; i < e; ++i) {
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ShuffleMask.push_back(2 * i + 1);
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ShuffleMask.push_back(2 * i + 1);
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}
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}
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void DecodeMOVDDUPMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {
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unsigned VectorSizeInBits = VT.getSizeInBits();
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unsigned ScalarSizeInBits = VT.getScalarSizeInBits();
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unsigned NumElts = VT.getVectorNumElements();
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unsigned NumLanes = VectorSizeInBits / 128;
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unsigned NumLaneElts = NumElts / NumLanes;
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unsigned NumLaneSubElts = 64 / ScalarSizeInBits;
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for (unsigned l = 0; l < NumElts; l += NumLaneElts)
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for (unsigned i = 0; i < NumLaneElts; i += NumLaneSubElts)
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for (unsigned s = 0; s != NumLaneSubElts; s++)
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ShuffleMask.push_back(l + s);
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}
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void DecodePSLLDQMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
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unsigned VectorSizeInBits = VT.getSizeInBits();
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unsigned NumElts = VectorSizeInBits / 8;
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unsigned NumLanes = VectorSizeInBits / 128;
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unsigned NumLaneElts = NumElts / NumLanes;
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for (unsigned l = 0; l < NumElts; l += NumLaneElts)
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for (unsigned i = 0; i < NumLaneElts; ++i) {
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int M = SM_SentinelZero;
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if (i >= Imm) M = i - Imm + l;
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ShuffleMask.push_back(M);
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}
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}
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void DecodePSRLDQMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
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unsigned VectorSizeInBits = VT.getSizeInBits();
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unsigned NumElts = VectorSizeInBits / 8;
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unsigned NumLanes = VectorSizeInBits / 128;
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unsigned NumLaneElts = NumElts / NumLanes;
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for (unsigned l = 0; l < NumElts; l += NumLaneElts)
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for (unsigned i = 0; i < NumLaneElts; ++i) {
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unsigned Base = i + Imm;
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int M = Base + l;
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if (Base >= NumLaneElts) M = SM_SentinelZero;
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ShuffleMask.push_back(M);
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}
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}
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void DecodePALIGNRMask(MVT VT, unsigned Imm,
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SmallVectorImpl<int> &ShuffleMask) {
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unsigned NumElts = VT.getVectorNumElements();
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unsigned Offset = Imm * (VT.getScalarSizeInBits() / 8);
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unsigned NumLanes = VT.getSizeInBits() / 128;
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unsigned NumLaneElts = NumElts / NumLanes;
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for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
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for (unsigned i = 0; i != NumLaneElts; ++i) {
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unsigned Base = i + Offset;
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// if i+offset is out of this lane then we actually need the other source
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if (Base >= NumLaneElts) Base += NumElts - NumLaneElts;
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ShuffleMask.push_back(Base + l);
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}
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}
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}
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void DecodeVALIGNMask(MVT VT, unsigned Imm,
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SmallVectorImpl<int> &ShuffleMask) {
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int NumElts = VT.getVectorNumElements();
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// Not all bits of the immediate are used so mask it.
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assert(isPowerOf2_32(NumElts) && "NumElts should be power of 2");
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Imm = Imm & (NumElts - 1);
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for (int i = 0; i != NumElts; ++i)
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ShuffleMask.push_back(i + Imm);
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}
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/// DecodePSHUFMask - This decodes the shuffle masks for pshufw, pshufd, and vpermilp*.
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/// VT indicates the type of the vector allowing it to handle different
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/// datatypes and vector widths.
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void DecodePSHUFMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
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unsigned NumElts = VT.getVectorNumElements();
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unsigned NumLanes = VT.getSizeInBits() / 128;
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if (NumLanes == 0) NumLanes = 1; // Handle MMX
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unsigned NumLaneElts = NumElts / NumLanes;
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unsigned NewImm = Imm;
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for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
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for (unsigned i = 0; i != NumLaneElts; ++i) {
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ShuffleMask.push_back(NewImm % NumLaneElts + l);
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NewImm /= NumLaneElts;
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}
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if (NumLaneElts == 4) NewImm = Imm; // reload imm
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}
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}
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void DecodePSHUFHWMask(MVT VT, unsigned Imm,
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SmallVectorImpl<int> &ShuffleMask) {
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unsigned NumElts = VT.getVectorNumElements();
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for (unsigned l = 0; l != NumElts; l += 8) {
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unsigned NewImm = Imm;
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for (unsigned i = 0, e = 4; i != e; ++i) {
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ShuffleMask.push_back(l + i);
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}
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for (unsigned i = 4, e = 8; i != e; ++i) {
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ShuffleMask.push_back(l + 4 + (NewImm & 3));
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NewImm >>= 2;
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}
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}
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}
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void DecodePSHUFLWMask(MVT VT, unsigned Imm,
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SmallVectorImpl<int> &ShuffleMask) {
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unsigned NumElts = VT.getVectorNumElements();
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for (unsigned l = 0; l != NumElts; l += 8) {
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unsigned NewImm = Imm;
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for (unsigned i = 0, e = 4; i != e; ++i) {
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ShuffleMask.push_back(l + (NewImm & 3));
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NewImm >>= 2;
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}
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for (unsigned i = 4, e = 8; i != e; ++i) {
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ShuffleMask.push_back(l + i);
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}
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}
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}
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void DecodePSWAPMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {
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unsigned NumElts = VT.getVectorNumElements();
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unsigned NumHalfElts = NumElts / 2;
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for (unsigned l = 0; l != NumHalfElts; ++l)
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ShuffleMask.push_back(l + NumHalfElts);
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for (unsigned h = 0; h != NumHalfElts; ++h)
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ShuffleMask.push_back(h);
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}
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/// DecodeSHUFPMask - This decodes the shuffle masks for shufp*. VT indicates
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/// the type of the vector allowing it to handle different datatypes and vector
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/// widths.
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void DecodeSHUFPMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
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unsigned NumElts = VT.getVectorNumElements();
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unsigned NumLanes = VT.getSizeInBits() / 128;
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unsigned NumLaneElts = NumElts / NumLanes;
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unsigned NewImm = Imm;
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for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
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// each half of a lane comes from different source
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for (unsigned s = 0; s != NumElts * 2; s += NumElts) {
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for (unsigned i = 0; i != NumLaneElts / 2; ++i) {
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ShuffleMask.push_back(NewImm % NumLaneElts + s + l);
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NewImm /= NumLaneElts;
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}
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}
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if (NumLaneElts == 4) NewImm = Imm; // reload imm
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}
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}
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/// DecodeUNPCKHMask - This decodes the shuffle masks for unpckhps/unpckhpd
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/// and punpckh*. VT indicates the type of the vector allowing it to handle
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/// different datatypes and vector widths.
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void DecodeUNPCKHMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {
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unsigned NumElts = VT.getVectorNumElements();
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// Handle 128 and 256-bit vector lengths. AVX defines UNPCK* to operate
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// independently on 128-bit lanes.
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unsigned NumLanes = VT.getSizeInBits() / 128;
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if (NumLanes == 0) NumLanes = 1; // Handle MMX
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unsigned NumLaneElts = NumElts / NumLanes;
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for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
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for (unsigned i = l + NumLaneElts / 2, e = l + NumLaneElts; i != e; ++i) {
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ShuffleMask.push_back(i); // Reads from dest/src1
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ShuffleMask.push_back(i + NumElts); // Reads from src/src2
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}
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}
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}
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/// DecodeUNPCKLMask - This decodes the shuffle masks for unpcklps/unpcklpd
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/// and punpckl*. VT indicates the type of the vector allowing it to handle
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/// different datatypes and vector widths.
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void DecodeUNPCKLMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {
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unsigned NumElts = VT.getVectorNumElements();
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// Handle 128 and 256-bit vector lengths. AVX defines UNPCK* to operate
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// independently on 128-bit lanes.
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unsigned NumLanes = VT.getSizeInBits() / 128;
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if (NumLanes == 0 ) NumLanes = 1; // Handle MMX
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unsigned NumLaneElts = NumElts / NumLanes;
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for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
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for (unsigned i = l, e = l + NumLaneElts / 2; i != e; ++i) {
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ShuffleMask.push_back(i); // Reads from dest/src1
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ShuffleMask.push_back(i + NumElts); // Reads from src/src2
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}
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}
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}
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/// Decodes a broadcast of the first element of a vector.
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void DecodeVectorBroadcast(MVT DstVT, SmallVectorImpl<int> &ShuffleMask) {
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unsigned NumElts = DstVT.getVectorNumElements();
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ShuffleMask.append(NumElts, 0);
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}
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/// Decodes a broadcast of a subvector to a larger vector type.
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void DecodeSubVectorBroadcast(MVT DstVT, MVT SrcVT,
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SmallVectorImpl<int> &ShuffleMask) {
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assert(SrcVT.getScalarType() == DstVT.getScalarType() &&
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"Non matching vector element types");
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unsigned NumElts = SrcVT.getVectorNumElements();
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unsigned Scale = DstVT.getSizeInBits() / SrcVT.getSizeInBits();
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for (unsigned i = 0; i != Scale; ++i)
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for (unsigned j = 0; j != NumElts; ++j)
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ShuffleMask.push_back(j);
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}
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/// \brief Decode a shuffle packed values at 128-bit granularity
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/// (SHUFF32x4/SHUFF64x2/SHUFI32x4/SHUFI64x2)
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/// immediate mask into a shuffle mask.
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void decodeVSHUF64x2FamilyMask(MVT VT, unsigned Imm,
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SmallVectorImpl<int> &ShuffleMask) {
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unsigned NumLanes = VT.getSizeInBits() / 128;
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unsigned NumElementsInLane = 128 / VT.getScalarSizeInBits();
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unsigned ControlBitsMask = NumLanes - 1;
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unsigned NumControlBits = NumLanes / 2;
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for (unsigned l = 0; l != NumLanes; ++l) {
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unsigned LaneMask = (Imm >> (l * NumControlBits)) & ControlBitsMask;
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// We actually need the other source.
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if (l >= NumLanes / 2)
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LaneMask += NumLanes;
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for (unsigned i = 0; i != NumElementsInLane; ++i)
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ShuffleMask.push_back(LaneMask * NumElementsInLane + i);
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}
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}
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void DecodeVPERM2X128Mask(MVT VT, unsigned Imm,
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SmallVectorImpl<int> &ShuffleMask) {
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unsigned HalfSize = VT.getVectorNumElements() / 2;
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for (unsigned l = 0; l != 2; ++l) {
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unsigned HalfMask = Imm >> (l * 4);
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unsigned HalfBegin = (HalfMask & 0x3) * HalfSize;
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for (unsigned i = HalfBegin, e = HalfBegin + HalfSize; i != e; ++i)
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ShuffleMask.push_back(HalfMask & 8 ? SM_SentinelZero : (int)i);
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}
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}
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void DecodePSHUFBMask(ArrayRef<uint64_t> RawMask,
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SmallVectorImpl<int> &ShuffleMask) {
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for (int i = 0, e = RawMask.size(); i < e; ++i) {
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uint64_t M = RawMask[i];
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if (M == (uint64_t)SM_SentinelUndef) {
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ShuffleMask.push_back(M);
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continue;
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}
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// For 256/512-bit vectors the base of the shuffle is the 128-bit
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// subvector we're inside.
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int Base = (i / 16) * 16;
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// If the high bit (7) of the byte is set, the element is zeroed.
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if (M & (1 << 7))
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ShuffleMask.push_back(SM_SentinelZero);
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else {
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// Only the least significant 4 bits of the byte are used.
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int Index = Base + (M & 0xf);
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ShuffleMask.push_back(Index);
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}
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}
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}
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void DecodeBLENDMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
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int ElementBits = VT.getScalarSizeInBits();
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int NumElements = VT.getVectorNumElements();
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for (int i = 0; i < NumElements; ++i) {
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// If there are more than 8 elements in the vector, then any immediate blend
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// mask applies to each 128-bit lane. There can never be more than
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// 8 elements in a 128-bit lane with an immediate blend.
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int Bit = NumElements > 8 ? i % (128 / ElementBits) : i;
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assert(Bit < 8 &&
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"Immediate blends only operate over 8 elements at a time!");
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ShuffleMask.push_back(((Imm >> Bit) & 1) ? NumElements + i : i);
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}
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}
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void DecodeVPPERMMask(ArrayRef<uint64_t> RawMask,
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SmallVectorImpl<int> &ShuffleMask) {
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assert(RawMask.size() == 16 && "Illegal VPPERM shuffle mask size");
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// VPPERM Operation
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// Bits[4:0] - Byte Index (0 - 31)
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// Bits[7:5] - Permute Operation
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//
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// Permute Operation:
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// 0 - Source byte (no logical operation).
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// 1 - Invert source byte.
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// 2 - Bit reverse of source byte.
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// 3 - Bit reverse of inverted source byte.
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// 4 - 00h (zero - fill).
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// 5 - FFh (ones - fill).
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// 6 - Most significant bit of source byte replicated in all bit positions.
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// 7 - Invert most significant bit of source byte and replicate in all bit positions.
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for (int i = 0, e = RawMask.size(); i < e; ++i) {
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uint64_t M = RawMask[i];
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if (M == (uint64_t)SM_SentinelUndef) {
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ShuffleMask.push_back(M);
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continue;
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}
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uint64_t PermuteOp = (M >> 5) & 0x7;
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if (PermuteOp == 4) {
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ShuffleMask.push_back(SM_SentinelZero);
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continue;
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}
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if (PermuteOp != 0) {
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ShuffleMask.clear();
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return;
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}
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uint64_t Index = M & 0x1F;
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ShuffleMask.push_back((int)Index);
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}
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}
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/// DecodeVPERMMask - this decodes the shuffle masks for VPERMQ/VPERMPD.
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void DecodeVPERMMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
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assert((VT.is256BitVector() || VT.is512BitVector()) &&
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(VT.getScalarSizeInBits() == 64) && "Unexpected vector value type");
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unsigned NumElts = VT.getVectorNumElements();
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for (unsigned l = 0; l != NumElts; l += 4)
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for (unsigned i = 0; i != 4; ++i)
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ShuffleMask.push_back(l + ((Imm >> (2 * i)) & 3));
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}
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void DecodeZeroExtendMask(MVT SrcScalarVT, MVT DstVT, SmallVectorImpl<int> &Mask) {
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unsigned NumDstElts = DstVT.getVectorNumElements();
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unsigned SrcScalarBits = SrcScalarVT.getSizeInBits();
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unsigned DstScalarBits = DstVT.getScalarSizeInBits();
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unsigned Scale = DstScalarBits / SrcScalarBits;
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assert(SrcScalarBits < DstScalarBits &&
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"Expected zero extension mask to increase scalar size");
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|
for (unsigned i = 0; i != NumDstElts; i++) {
|
|
Mask.push_back(i);
|
|
for (unsigned j = 1; j != Scale; j++)
|
|
Mask.push_back(SM_SentinelZero);
|
|
}
|
|
}
|
|
|
|
void DecodeZeroMoveLowMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
ShuffleMask.push_back(0);
|
|
for (unsigned i = 1; i < NumElts; i++)
|
|
ShuffleMask.push_back(SM_SentinelZero);
|
|
}
|
|
|
|
void DecodeScalarMoveMask(MVT VT, bool IsLoad, SmallVectorImpl<int> &Mask) {
|
|
// First element comes from the first element of second source.
|
|
// Remaining elements: Load zero extends / Move copies from first source.
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
Mask.push_back(NumElts);
|
|
for (unsigned i = 1; i < NumElts; i++)
|
|
Mask.push_back(IsLoad ? static_cast<int>(SM_SentinelZero) : i);
|
|
}
|
|
|
|
void DecodeEXTRQIMask(int Len, int Idx,
|
|
SmallVectorImpl<int> &ShuffleMask) {
|
|
// 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 bytes.
|
|
if (0 != (Len % 8) || 0 != (Idx % 8))
|
|
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(16, SM_SentinelUndef);
|
|
return;
|
|
}
|
|
|
|
// Convert index and index to work with bytes.
|
|
Len /= 8;
|
|
Idx /= 8;
|
|
|
|
// EXTRQ: Extract Len bytes starting from Idx. Zero pad the remaining bytes
|
|
// 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 != 8; ++i)
|
|
ShuffleMask.push_back(SM_SentinelZero);
|
|
for (int i = 8; i != 16; ++i)
|
|
ShuffleMask.push_back(SM_SentinelUndef);
|
|
}
|
|
|
|
void DecodeINSERTQIMask(int Len, int Idx,
|
|
SmallVectorImpl<int> &ShuffleMask) {
|
|
// 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 bytes.
|
|
if (0 != (Len % 8) || 0 != (Idx % 8))
|
|
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(16, SM_SentinelUndef);
|
|
return;
|
|
}
|
|
|
|
// Convert index and index to work with bytes.
|
|
Len /= 8;
|
|
Idx /= 8;
|
|
|
|
// INSERTQ: Extract lowest Len bytes from lower half of second source and
|
|
// insert over first source starting at Idx byte. 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 + 16);
|
|
for (int i = Idx + Len; i != 8; ++i)
|
|
ShuffleMask.push_back(i);
|
|
for (int i = 8; i != 16; ++i)
|
|
ShuffleMask.push_back(SM_SentinelUndef);
|
|
}
|
|
|
|
void DecodeVPERMILPMask(MVT VT, ArrayRef<uint64_t> RawMask,
|
|
SmallVectorImpl<int> &ShuffleMask) {
|
|
unsigned VecSize = VT.getSizeInBits();
|
|
unsigned EltSize = VT.getScalarSizeInBits();
|
|
unsigned NumLanes = VecSize / 128;
|
|
unsigned NumEltsPerLane = VT.getVectorNumElements() / NumLanes;
|
|
assert((VecSize == 128 || VecSize == 256 || VecSize == 512) &&
|
|
"Unexpected vector size");
|
|
assert((EltSize == 32 || EltSize == 64) && "Unexpected element size");
|
|
|
|
for (unsigned i = 0, e = RawMask.size(); i < e; ++i) {
|
|
uint64_t M = RawMask[i];
|
|
M = (EltSize == 64 ? ((M >> 1) & 0x1) : (M & 0x3));
|
|
unsigned LaneOffset = i & ~(NumEltsPerLane - 1);
|
|
ShuffleMask.push_back((int)(LaneOffset + M));
|
|
}
|
|
}
|
|
|
|
void DecodeVPERMIL2PMask(MVT VT, unsigned M2Z, ArrayRef<uint64_t> RawMask,
|
|
SmallVectorImpl<int> &ShuffleMask) {
|
|
unsigned VecSize = VT.getSizeInBits();
|
|
unsigned EltSize = VT.getScalarSizeInBits();
|
|
unsigned NumLanes = VecSize / 128;
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
unsigned NumEltsPerLane = NumElts / NumLanes;
|
|
assert((VecSize == 128 || VecSize == 256) && "Unexpected vector size");
|
|
assert((EltSize == 32 || EltSize == 64) && "Unexpected element size");
|
|
assert((NumElts == RawMask.size()) && "Unexpected mask size");
|
|
|
|
for (unsigned i = 0, e = RawMask.size(); i < e; ++i) {
|
|
// 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 (EltSize == 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,
|
|
SmallVectorImpl<int> &ShuffleMask) {
|
|
uint64_t EltMaskSize = RawMask.size() - 1;
|
|
for (auto M : RawMask) {
|
|
M &= EltMaskSize;
|
|
ShuffleMask.push_back((int)M);
|
|
}
|
|
}
|
|
|
|
void DecodeVPERMV3Mask(ArrayRef<uint64_t> RawMask,
|
|
SmallVectorImpl<int> &ShuffleMask) {
|
|
uint64_t EltMaskSize = (RawMask.size() * 2) - 1;
|
|
for (auto M : RawMask) {
|
|
M &= EltMaskSize;
|
|
ShuffleMask.push_back((int)M);
|
|
}
|
|
}
|
|
|
|
} // llvm namespace
|