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https://github.com/c64scene-ar/llvm-6502.git
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d996c5b54b
BLENDPS, BLENDPD, and PBLENDW instructions into pretty shuffle comments. These will be used in my next commit as part of test cases for AVX shuffles which can directly use blend in more places. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215701 91177308-0d34-0410-b5e6-96231b3b80d8
277 lines
9.6 KiB
C++
277 lines
9.6 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/IR/Constants.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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// <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 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.getVectorElementType().getSizeInBits() / 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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/// DecodePSHUFMask - This decodes the shuffle masks for 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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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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/// 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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void DecodeVPERM2X128Mask(MVT VT, unsigned Imm,
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SmallVectorImpl<int> &ShuffleMask) {
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if (Imm & 0x88)
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return; // Not a shuffle
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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 HalfBegin = ((Imm >> (l*4)) & 0x3) * HalfSize;
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for (unsigned i = HalfBegin, e = HalfBegin+HalfSize; i != e; ++i)
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ShuffleMask.push_back(i);
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}
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}
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void DecodePSHUFBMask(const ConstantDataSequential *C,
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SmallVectorImpl<int> &ShuffleMask) {
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Type *MaskTy = C->getType();
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assert(MaskTy->isVectorTy() && "Expected a vector constant mask!");
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assert(MaskTy->getVectorElementType()->isIntegerTy(8) &&
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"Expected i8 constant mask elements!");
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int NumElements = MaskTy->getVectorNumElements();
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// FIXME: Add support for AVX-512.
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assert((NumElements == 16 || NumElements == 32) &&
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"Only 128-bit and 256-bit vectors supported!");
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assert((unsigned)NumElements == C->getNumElements() &&
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"Constant mask has a different number of elements!");
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ShuffleMask.reserve(NumElements);
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for (int i = 0; i < NumElements; ++i) {
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// For AVX vectors with 32 bytes the base of the shuffle is the half of the
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// vector we're inside.
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int Base = i < 16 ? 0 : 16;
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uint64_t Element = C->getElementAsInteger(i);
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// If the high bit (7) of the byte is set, the element is zeroed.
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if (Element & (1 << 7))
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ShuffleMask.push_back(SM_SentinelZero);
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else {
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int Index = Base + Element;
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assert((Index >= 0 && Index < NumElements) &&
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"Out of bounds shuffle index for pshub instruction!");
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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 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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// For AVX vectors with 32 bytes the base of the shuffle is the half of
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// the vector we're inside.
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int Base = i < 16 ? 0 : 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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int Index = Base + M;
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assert((Index >= 0 && (unsigned)Index < RawMask.size()) &&
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"Out of bounds shuffle index for pshub instruction!");
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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,
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SmallVectorImpl<int> &ShuffleMask) {
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int NumElements = VT.getVectorNumElements();
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for (int i = 0; i < NumElements; ++i)
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ShuffleMask.push_back(((Imm >> i) & 1) ? NumElements + i : i);
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}
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/// DecodeVPERMMask - this decodes the shuffle masks for VPERMQ/VPERMPD.
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/// No VT provided since it only works on 256-bit, 4 element vectors.
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void DecodeVPERMMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
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for (unsigned i = 0; i != 4; ++i) {
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ShuffleMask.push_back((Imm >> (2*i)) & 3);
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}
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}
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} // llvm namespace
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