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ca21d7bdab
The current implementation assumes the destination type of shuffle is the same as the decomposed ones. Add the check to avoid crush when the condition is not satisfied. This fixes PR37616. Reviewed By: RKSimon Differential Revision: https://reviews.llvm.org/D102751
853 lines
32 KiB
C++
853 lines
32 KiB
C++
//===- X86InterleavedAccess.cpp -------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file
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/// This file contains the X86 implementation of the interleaved accesses
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/// optimization generating X86-specific instructions/intrinsics for
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/// interleaved access groups.
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//
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//===----------------------------------------------------------------------===//
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#include "X86ISelLowering.h"
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#include "X86Subtarget.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Analysis/VectorUtils.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/Instruction.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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#include "llvm/IR/Value.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/MachineValueType.h"
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#include <algorithm>
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#include <cassert>
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#include <cmath>
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#include <cstdint>
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using namespace llvm;
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namespace {
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/// This class holds necessary information to represent an interleaved
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/// access group and supports utilities to lower the group into
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/// X86-specific instructions/intrinsics.
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/// E.g. A group of interleaving access loads (Factor = 2; accessing every
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/// other element)
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/// %wide.vec = load <8 x i32>, <8 x i32>* %ptr
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/// %v0 = shuffle <8 x i32> %wide.vec, <8 x i32> poison, <0, 2, 4, 6>
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/// %v1 = shuffle <8 x i32> %wide.vec, <8 x i32> poison, <1, 3, 5, 7>
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class X86InterleavedAccessGroup {
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/// Reference to the wide-load instruction of an interleaved access
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/// group.
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Instruction *const Inst;
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/// Reference to the shuffle(s), consumer(s) of the (load) 'Inst'.
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ArrayRef<ShuffleVectorInst *> Shuffles;
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/// Reference to the starting index of each user-shuffle.
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ArrayRef<unsigned> Indices;
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/// Reference to the interleaving stride in terms of elements.
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const unsigned Factor;
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/// Reference to the underlying target.
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const X86Subtarget &Subtarget;
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const DataLayout &DL;
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IRBuilder<> &Builder;
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/// Breaks down a vector \p 'Inst' of N elements into \p NumSubVectors
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/// sub vectors of type \p T. Returns the sub-vectors in \p DecomposedVectors.
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void decompose(Instruction *Inst, unsigned NumSubVectors, FixedVectorType *T,
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SmallVectorImpl<Instruction *> &DecomposedVectors);
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/// Performs matrix transposition on a 4x4 matrix \p InputVectors and
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/// returns the transposed-vectors in \p TransposedVectors.
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/// E.g.
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/// InputVectors:
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/// In-V0 = p1, p2, p3, p4
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/// In-V1 = q1, q2, q3, q4
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/// In-V2 = r1, r2, r3, r4
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/// In-V3 = s1, s2, s3, s4
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/// OutputVectors:
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/// Out-V0 = p1, q1, r1, s1
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/// Out-V1 = p2, q2, r2, s2
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/// Out-V2 = p3, q3, r3, s3
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/// Out-V3 = P4, q4, r4, s4
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void transpose_4x4(ArrayRef<Instruction *> InputVectors,
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SmallVectorImpl<Value *> &TransposedMatrix);
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void interleave8bitStride4(ArrayRef<Instruction *> InputVectors,
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SmallVectorImpl<Value *> &TransposedMatrix,
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unsigned NumSubVecElems);
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void interleave8bitStride4VF8(ArrayRef<Instruction *> InputVectors,
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SmallVectorImpl<Value *> &TransposedMatrix);
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void interleave8bitStride3(ArrayRef<Instruction *> InputVectors,
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SmallVectorImpl<Value *> &TransposedMatrix,
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unsigned NumSubVecElems);
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void deinterleave8bitStride3(ArrayRef<Instruction *> InputVectors,
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SmallVectorImpl<Value *> &TransposedMatrix,
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unsigned NumSubVecElems);
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public:
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/// In order to form an interleaved access group X86InterleavedAccessGroup
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/// requires a wide-load instruction \p 'I', a group of interleaved-vectors
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/// \p Shuffs, reference to the first indices of each interleaved-vector
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/// \p 'Ind' and the interleaving stride factor \p F. In order to generate
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/// X86-specific instructions/intrinsics it also requires the underlying
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/// target information \p STarget.
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explicit X86InterleavedAccessGroup(Instruction *I,
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ArrayRef<ShuffleVectorInst *> Shuffs,
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ArrayRef<unsigned> Ind, const unsigned F,
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const X86Subtarget &STarget,
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IRBuilder<> &B)
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: Inst(I), Shuffles(Shuffs), Indices(Ind), Factor(F), Subtarget(STarget),
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DL(Inst->getModule()->getDataLayout()), Builder(B) {}
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/// Returns true if this interleaved access group can be lowered into
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/// x86-specific instructions/intrinsics, false otherwise.
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bool isSupported() const;
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/// Lowers this interleaved access group into X86-specific
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/// instructions/intrinsics.
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bool lowerIntoOptimizedSequence();
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};
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} // end anonymous namespace
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bool X86InterleavedAccessGroup::isSupported() const {
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VectorType *ShuffleVecTy = Shuffles[0]->getType();
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Type *ShuffleEltTy = ShuffleVecTy->getElementType();
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unsigned ShuffleElemSize = DL.getTypeSizeInBits(ShuffleEltTy);
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unsigned WideInstSize;
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// Currently, lowering is supported for the following vectors:
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// Stride 4:
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// 1. Store and load of 4-element vectors of 64 bits on AVX.
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// 2. Store of 16/32-element vectors of 8 bits on AVX.
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// Stride 3:
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// 1. Load of 16/32-element vectors of 8 bits on AVX.
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if (!Subtarget.hasAVX() || (Factor != 4 && Factor != 3))
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return false;
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if (isa<LoadInst>(Inst)) {
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WideInstSize = DL.getTypeSizeInBits(Inst->getType());
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if (cast<LoadInst>(Inst)->getPointerAddressSpace())
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return false;
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} else
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WideInstSize = DL.getTypeSizeInBits(Shuffles[0]->getType());
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// We support shuffle represents stride 4 for byte type with size of
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// WideInstSize.
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if (ShuffleElemSize == 64 && WideInstSize == 1024 && Factor == 4)
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return true;
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if (ShuffleElemSize == 8 && isa<StoreInst>(Inst) && Factor == 4 &&
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(WideInstSize == 256 || WideInstSize == 512 || WideInstSize == 1024 ||
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WideInstSize == 2048))
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return true;
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if (ShuffleElemSize == 8 && Factor == 3 &&
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(WideInstSize == 384 || WideInstSize == 768 || WideInstSize == 1536))
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return true;
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return false;
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}
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void X86InterleavedAccessGroup::decompose(
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Instruction *VecInst, unsigned NumSubVectors, FixedVectorType *SubVecTy,
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SmallVectorImpl<Instruction *> &DecomposedVectors) {
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assert((isa<LoadInst>(VecInst) || isa<ShuffleVectorInst>(VecInst)) &&
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"Expected Load or Shuffle");
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Type *VecWidth = VecInst->getType();
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(void)VecWidth;
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assert(VecWidth->isVectorTy() &&
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DL.getTypeSizeInBits(VecWidth) >=
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DL.getTypeSizeInBits(SubVecTy) * NumSubVectors &&
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"Invalid Inst-size!!!");
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if (auto *SVI = dyn_cast<ShuffleVectorInst>(VecInst)) {
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Value *Op0 = SVI->getOperand(0);
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Value *Op1 = SVI->getOperand(1);
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// Generate N(= NumSubVectors) shuffles of T(= SubVecTy) type.
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for (unsigned i = 0; i < NumSubVectors; ++i)
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DecomposedVectors.push_back(
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cast<ShuffleVectorInst>(Builder.CreateShuffleVector(
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Op0, Op1,
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createSequentialMask(Indices[i], SubVecTy->getNumElements(),
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0))));
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return;
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}
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// Decompose the load instruction.
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LoadInst *LI = cast<LoadInst>(VecInst);
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Type *VecBaseTy, *VecBasePtrTy;
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Value *VecBasePtr;
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unsigned int NumLoads = NumSubVectors;
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// In the case of stride 3 with a vector of 32 elements load the information
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// in the following way:
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// [0,1...,VF/2-1,VF/2+VF,VF/2+VF+1,...,2VF-1]
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unsigned VecLength = DL.getTypeSizeInBits(VecWidth);
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if (VecLength == 768 || VecLength == 1536) {
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VecBaseTy = FixedVectorType::get(Type::getInt8Ty(LI->getContext()), 16);
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VecBasePtrTy = VecBaseTy->getPointerTo(LI->getPointerAddressSpace());
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VecBasePtr = Builder.CreateBitCast(LI->getPointerOperand(), VecBasePtrTy);
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NumLoads = NumSubVectors * (VecLength / 384);
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} else {
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VecBaseTy = SubVecTy;
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VecBasePtrTy = VecBaseTy->getPointerTo(LI->getPointerAddressSpace());
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VecBasePtr = Builder.CreateBitCast(LI->getPointerOperand(), VecBasePtrTy);
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}
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// Generate N loads of T type.
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assert(VecBaseTy->getPrimitiveSizeInBits().isKnownMultipleOf(8) &&
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"VecBaseTy's size must be a multiple of 8");
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const Align FirstAlignment = LI->getAlign();
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const Align SubsequentAlignment = commonAlignment(
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FirstAlignment, VecBaseTy->getPrimitiveSizeInBits().getFixedSize() / 8);
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Align Alignment = FirstAlignment;
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for (unsigned i = 0; i < NumLoads; i++) {
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// TODO: Support inbounds GEP.
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Value *NewBasePtr =
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Builder.CreateGEP(VecBaseTy, VecBasePtr, Builder.getInt32(i));
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Instruction *NewLoad =
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Builder.CreateAlignedLoad(VecBaseTy, NewBasePtr, Alignment);
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DecomposedVectors.push_back(NewLoad);
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Alignment = SubsequentAlignment;
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}
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}
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// Changing the scale of the vector type by reducing the number of elements and
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// doubling the scalar size.
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static MVT scaleVectorType(MVT VT) {
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unsigned ScalarSize = VT.getVectorElementType().getScalarSizeInBits() * 2;
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return MVT::getVectorVT(MVT::getIntegerVT(ScalarSize),
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VT.getVectorNumElements() / 2);
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}
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static constexpr int Concat[] = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
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16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
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32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
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48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63};
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// genShuffleBland - Creates shuffle according to two vectors.This function is
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// only works on instructions with lane inside 256 registers. According to
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// the mask 'Mask' creates a new Mask 'Out' by the offset of the mask. The
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// offset amount depends on the two integer, 'LowOffset' and 'HighOffset'.
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// Where the 'LowOffset' refers to the first vector and the highOffset refers to
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// the second vector.
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// |a0....a5,b0....b4,c0....c4|a16..a21,b16..b20,c16..c20|
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// |c5...c10,a5....a9,b5....b9|c21..c26,a22..a26,b21..b25|
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// |b10..b15,c11..c15,a10..a15|b26..b31,c27..c31,a27..a31|
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// For the sequence to work as a mirror to the load.
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// We must consider the elements order as above.
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// In this function we are combining two types of shuffles.
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// The first one is vpshufed and the second is a type of "blend" shuffle.
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// By computing the shuffle on a sequence of 16 elements(one lane) and add the
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// correct offset. We are creating a vpsuffed + blend sequence between two
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// shuffles.
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static void genShuffleBland(MVT VT, ArrayRef<int> Mask,
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SmallVectorImpl<int> &Out, int LowOffset,
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int HighOffset) {
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assert(VT.getSizeInBits() >= 256 &&
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"This function doesn't accept width smaller then 256");
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unsigned NumOfElm = VT.getVectorNumElements();
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for (unsigned i = 0; i < Mask.size(); i++)
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Out.push_back(Mask[i] + LowOffset);
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for (unsigned i = 0; i < Mask.size(); i++)
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Out.push_back(Mask[i] + HighOffset + NumOfElm);
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}
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// reorderSubVector returns the data to is the original state. And de-facto is
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// the opposite of the function concatSubVector.
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// For VecElems = 16
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// Invec[0] - |0| TransposedMatrix[0] - |0|
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// Invec[1] - |1| => TransposedMatrix[1] - |1|
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// Invec[2] - |2| TransposedMatrix[2] - |2|
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// For VecElems = 32
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// Invec[0] - |0|3| TransposedMatrix[0] - |0|1|
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// Invec[1] - |1|4| => TransposedMatrix[1] - |2|3|
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// Invec[2] - |2|5| TransposedMatrix[2] - |4|5|
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// For VecElems = 64
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// Invec[0] - |0|3|6|9 | TransposedMatrix[0] - |0|1|2 |3 |
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// Invec[1] - |1|4|7|10| => TransposedMatrix[1] - |4|5|6 |7 |
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// Invec[2] - |2|5|8|11| TransposedMatrix[2] - |8|9|10|11|
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static void reorderSubVector(MVT VT, SmallVectorImpl<Value *> &TransposedMatrix,
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ArrayRef<Value *> Vec, ArrayRef<int> VPShuf,
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unsigned VecElems, unsigned Stride,
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IRBuilder<> &Builder) {
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if (VecElems == 16) {
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for (unsigned i = 0; i < Stride; i++)
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TransposedMatrix[i] = Builder.CreateShuffleVector(Vec[i], VPShuf);
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return;
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}
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SmallVector<int, 32> OptimizeShuf;
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Value *Temp[8];
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for (unsigned i = 0; i < (VecElems / 16) * Stride; i += 2) {
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genShuffleBland(VT, VPShuf, OptimizeShuf, (i / Stride) * 16,
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(i + 1) / Stride * 16);
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Temp[i / 2] = Builder.CreateShuffleVector(
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Vec[i % Stride], Vec[(i + 1) % Stride], OptimizeShuf);
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OptimizeShuf.clear();
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}
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if (VecElems == 32) {
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std::copy(Temp, Temp + Stride, TransposedMatrix.begin());
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return;
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} else
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for (unsigned i = 0; i < Stride; i++)
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TransposedMatrix[i] =
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Builder.CreateShuffleVector(Temp[2 * i], Temp[2 * i + 1], Concat);
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}
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void X86InterleavedAccessGroup::interleave8bitStride4VF8(
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ArrayRef<Instruction *> Matrix,
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SmallVectorImpl<Value *> &TransposedMatrix) {
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// Assuming we start from the following vectors:
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// Matrix[0]= c0 c1 c2 c3 c4 ... c7
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// Matrix[1]= m0 m1 m2 m3 m4 ... m7
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// Matrix[2]= y0 y1 y2 y3 y4 ... y7
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// Matrix[3]= k0 k1 k2 k3 k4 ... k7
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MVT VT = MVT::v8i16;
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TransposedMatrix.resize(2);
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SmallVector<int, 16> MaskLow;
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SmallVector<int, 32> MaskLowTemp1, MaskLowWord;
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SmallVector<int, 32> MaskHighTemp1, MaskHighWord;
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for (unsigned i = 0; i < 8; ++i) {
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MaskLow.push_back(i);
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MaskLow.push_back(i + 8);
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}
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createUnpackShuffleMask(VT, MaskLowTemp1, true, false);
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createUnpackShuffleMask(VT, MaskHighTemp1, false, false);
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narrowShuffleMaskElts(2, MaskHighTemp1, MaskHighWord);
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narrowShuffleMaskElts(2, MaskLowTemp1, MaskLowWord);
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// IntrVec1Low = c0 m0 c1 m1 c2 m2 c3 m3 c4 m4 c5 m5 c6 m6 c7 m7
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// IntrVec2Low = y0 k0 y1 k1 y2 k2 y3 k3 y4 k4 y5 k5 y6 k6 y7 k7
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Value *IntrVec1Low =
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Builder.CreateShuffleVector(Matrix[0], Matrix[1], MaskLow);
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Value *IntrVec2Low =
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Builder.CreateShuffleVector(Matrix[2], Matrix[3], MaskLow);
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// TransposedMatrix[0] = c0 m0 y0 k0 c1 m1 y1 k1 c2 m2 y2 k2 c3 m3 y3 k3
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// TransposedMatrix[1] = c4 m4 y4 k4 c5 m5 y5 k5 c6 m6 y6 k6 c7 m7 y7 k7
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TransposedMatrix[0] =
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Builder.CreateShuffleVector(IntrVec1Low, IntrVec2Low, MaskLowWord);
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TransposedMatrix[1] =
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Builder.CreateShuffleVector(IntrVec1Low, IntrVec2Low, MaskHighWord);
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}
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void X86InterleavedAccessGroup::interleave8bitStride4(
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ArrayRef<Instruction *> Matrix, SmallVectorImpl<Value *> &TransposedMatrix,
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unsigned NumOfElm) {
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// Example: Assuming we start from the following vectors:
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// Matrix[0]= c0 c1 c2 c3 c4 ... c31
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// Matrix[1]= m0 m1 m2 m3 m4 ... m31
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// Matrix[2]= y0 y1 y2 y3 y4 ... y31
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// Matrix[3]= k0 k1 k2 k3 k4 ... k31
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MVT VT = MVT::getVectorVT(MVT::i8, NumOfElm);
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MVT HalfVT = scaleVectorType(VT);
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TransposedMatrix.resize(4);
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SmallVector<int, 32> MaskHigh;
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SmallVector<int, 32> MaskLow;
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SmallVector<int, 32> LowHighMask[2];
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SmallVector<int, 32> MaskHighTemp;
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SmallVector<int, 32> MaskLowTemp;
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// MaskHighTemp and MaskLowTemp built in the vpunpckhbw and vpunpcklbw X86
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// shuffle pattern.
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createUnpackShuffleMask(VT, MaskLow, true, false);
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createUnpackShuffleMask(VT, MaskHigh, false, false);
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// MaskHighTemp1 and MaskLowTemp1 built in the vpunpckhdw and vpunpckldw X86
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// shuffle pattern.
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createUnpackShuffleMask(HalfVT, MaskLowTemp, true, false);
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createUnpackShuffleMask(HalfVT, MaskHighTemp, false, false);
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narrowShuffleMaskElts(2, MaskLowTemp, LowHighMask[0]);
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narrowShuffleMaskElts(2, MaskHighTemp, LowHighMask[1]);
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// IntrVec1Low = c0 m0 c1 m1 ... c7 m7 | c16 m16 c17 m17 ... c23 m23
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// IntrVec1High = c8 m8 c9 m9 ... c15 m15 | c24 m24 c25 m25 ... c31 m31
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// IntrVec2Low = y0 k0 y1 k1 ... y7 k7 | y16 k16 y17 k17 ... y23 k23
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// IntrVec2High = y8 k8 y9 k9 ... y15 k15 | y24 k24 y25 k25 ... y31 k31
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Value *IntrVec[4];
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IntrVec[0] = Builder.CreateShuffleVector(Matrix[0], Matrix[1], MaskLow);
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IntrVec[1] = Builder.CreateShuffleVector(Matrix[0], Matrix[1], MaskHigh);
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IntrVec[2] = Builder.CreateShuffleVector(Matrix[2], Matrix[3], MaskLow);
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IntrVec[3] = Builder.CreateShuffleVector(Matrix[2], Matrix[3], MaskHigh);
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// cmyk4 cmyk5 cmyk6 cmyk7 | cmyk20 cmyk21 cmyk22 cmyk23
|
|
// cmyk12 cmyk13 cmyk14 cmyk15 | cmyk28 cmyk29 cmyk30 cmyk31
|
|
// cmyk0 cmyk1 cmyk2 cmyk3 | cmyk16 cmyk17 cmyk18 cmyk19
|
|
// cmyk8 cmyk9 cmyk10 cmyk11 | cmyk24 cmyk25 cmyk26 cmyk27
|
|
|
|
Value *VecOut[4];
|
|
for (int i = 0; i < 4; i++)
|
|
VecOut[i] = Builder.CreateShuffleVector(IntrVec[i / 2], IntrVec[i / 2 + 2],
|
|
LowHighMask[i % 2]);
|
|
|
|
// cmyk0 cmyk1 cmyk2 cmyk3 | cmyk4 cmyk5 cmyk6 cmyk7
|
|
// cmyk8 cmyk9 cmyk10 cmyk11 | cmyk12 cmyk13 cmyk14 cmyk15
|
|
// cmyk16 cmyk17 cmyk18 cmyk19 | cmyk20 cmyk21 cmyk22 cmyk23
|
|
// cmyk24 cmyk25 cmyk26 cmyk27 | cmyk28 cmyk29 cmyk30 cmyk31
|
|
|
|
if (VT == MVT::v16i8) {
|
|
std::copy(VecOut, VecOut + 4, TransposedMatrix.begin());
|
|
return;
|
|
}
|
|
|
|
reorderSubVector(VT, TransposedMatrix, VecOut, makeArrayRef(Concat, 16),
|
|
NumOfElm, 4, Builder);
|
|
}
|
|
|
|
// createShuffleStride returns shuffle mask of size N.
|
|
// The shuffle pattern is as following :
|
|
// {0, Stride%(VF/Lane), (2*Stride%(VF/Lane))...(VF*Stride/Lane)%(VF/Lane),
|
|
// (VF/ Lane) ,(VF / Lane)+Stride%(VF/Lane),...,
|
|
// (VF / Lane)+(VF*Stride/Lane)%(VF/Lane)}
|
|
// Where Lane is the # of lanes in a register:
|
|
// VectorSize = 128 => Lane = 1
|
|
// VectorSize = 256 => Lane = 2
|
|
// For example shuffle pattern for VF 16 register size 256 -> lanes = 2
|
|
// {<[0|3|6|1|4|7|2|5]-[8|11|14|9|12|15|10|13]>}
|
|
static void createShuffleStride(MVT VT, int Stride,
|
|
SmallVectorImpl<int> &Mask) {
|
|
int VectorSize = VT.getSizeInBits();
|
|
int VF = VT.getVectorNumElements();
|
|
int LaneCount = std::max(VectorSize / 128, 1);
|
|
for (int Lane = 0; Lane < LaneCount; Lane++)
|
|
for (int i = 0, LaneSize = VF / LaneCount; i != LaneSize; ++i)
|
|
Mask.push_back((i * Stride) % LaneSize + LaneSize * Lane);
|
|
}
|
|
|
|
// setGroupSize sets 'SizeInfo' to the size(number of elements) of group
|
|
// inside mask a shuffleMask. A mask contains exactly 3 groups, where
|
|
// each group is a monotonically increasing sequence with stride 3.
|
|
// For example shuffleMask {0,3,6,1,4,7,2,5} => {3,3,2}
|
|
static void setGroupSize(MVT VT, SmallVectorImpl<int> &SizeInfo) {
|
|
int VectorSize = VT.getSizeInBits();
|
|
int VF = VT.getVectorNumElements() / std::max(VectorSize / 128, 1);
|
|
for (int i = 0, FirstGroupElement = 0; i < 3; i++) {
|
|
int GroupSize = std::ceil((VF - FirstGroupElement) / 3.0);
|
|
SizeInfo.push_back(GroupSize);
|
|
FirstGroupElement = ((GroupSize)*3 + FirstGroupElement) % VF;
|
|
}
|
|
}
|
|
|
|
// DecodePALIGNRMask returns the shuffle mask of vpalign instruction.
|
|
// vpalign works according to lanes
|
|
// Where Lane is the # of lanes in a register:
|
|
// VectorWide = 128 => Lane = 1
|
|
// VectorWide = 256 => Lane = 2
|
|
// For Lane = 1 shuffle pattern is: {DiffToJump,...,DiffToJump+VF-1}.
|
|
// For Lane = 2 shuffle pattern is:
|
|
// {DiffToJump,...,VF/2-1,VF,...,DiffToJump+VF-1}.
|
|
// Imm variable sets the offset amount. The result of the
|
|
// function is stored inside ShuffleMask vector and it built as described in
|
|
// the begin of the description. AlignDirection is a boolean that indicates the
|
|
// direction of the alignment. (false - align to the "right" side while true -
|
|
// align to the "left" side)
|
|
static void DecodePALIGNRMask(MVT VT, unsigned Imm,
|
|
SmallVectorImpl<int> &ShuffleMask,
|
|
bool AlignDirection = true, bool Unary = false) {
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
unsigned NumLanes = std::max((int)VT.getSizeInBits() / 128, 1);
|
|
unsigned NumLaneElts = NumElts / NumLanes;
|
|
|
|
Imm = AlignDirection ? Imm : (NumLaneElts - Imm);
|
|
unsigned Offset = Imm * (VT.getScalarSizeInBits() / 8);
|
|
|
|
for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
|
|
for (unsigned i = 0; i != NumLaneElts; ++i) {
|
|
unsigned Base = i + Offset;
|
|
// if i+offset is out of this lane then we actually need the other source
|
|
// If Unary the other source is the first source.
|
|
if (Base >= NumLaneElts)
|
|
Base = Unary ? Base % NumLaneElts : Base + NumElts - NumLaneElts;
|
|
ShuffleMask.push_back(Base + l);
|
|
}
|
|
}
|
|
}
|
|
|
|
// concatSubVector - The function rebuilds the data to a correct expected
|
|
// order. An assumption(The shape of the matrix) was taken for the
|
|
// deinterleaved to work with lane's instructions like 'vpalign' or 'vphuf'.
|
|
// This function ensures that the data is built in correct way for the lane
|
|
// instructions. Each lane inside the vector is a 128-bit length.
|
|
//
|
|
// The 'InVec' argument contains the data in increasing order. In InVec[0] You
|
|
// can find the first 128 bit data. The number of different lanes inside a
|
|
// vector depends on the 'VecElems'.In general, the formula is
|
|
// VecElems * type / 128. The size of the array 'InVec' depends and equal to
|
|
// 'VecElems'.
|
|
|
|
// For VecElems = 16
|
|
// Invec[0] - |0| Vec[0] - |0|
|
|
// Invec[1] - |1| => Vec[1] - |1|
|
|
// Invec[2] - |2| Vec[2] - |2|
|
|
|
|
// For VecElems = 32
|
|
// Invec[0] - |0|1| Vec[0] - |0|3|
|
|
// Invec[1] - |2|3| => Vec[1] - |1|4|
|
|
// Invec[2] - |4|5| Vec[2] - |2|5|
|
|
|
|
// For VecElems = 64
|
|
// Invec[0] - |0|1|2 |3 | Vec[0] - |0|3|6|9 |
|
|
// Invec[1] - |4|5|6 |7 | => Vec[1] - |1|4|7|10|
|
|
// Invec[2] - |8|9|10|11| Vec[2] - |2|5|8|11|
|
|
|
|
static void concatSubVector(Value **Vec, ArrayRef<Instruction *> InVec,
|
|
unsigned VecElems, IRBuilder<> &Builder) {
|
|
if (VecElems == 16) {
|
|
for (int i = 0; i < 3; i++)
|
|
Vec[i] = InVec[i];
|
|
return;
|
|
}
|
|
|
|
for (unsigned j = 0; j < VecElems / 32; j++)
|
|
for (int i = 0; i < 3; i++)
|
|
Vec[i + j * 3] = Builder.CreateShuffleVector(
|
|
InVec[j * 6 + i], InVec[j * 6 + i + 3], makeArrayRef(Concat, 32));
|
|
|
|
if (VecElems == 32)
|
|
return;
|
|
|
|
for (int i = 0; i < 3; i++)
|
|
Vec[i] = Builder.CreateShuffleVector(Vec[i], Vec[i + 3], Concat);
|
|
}
|
|
|
|
void X86InterleavedAccessGroup::deinterleave8bitStride3(
|
|
ArrayRef<Instruction *> InVec, SmallVectorImpl<Value *> &TransposedMatrix,
|
|
unsigned VecElems) {
|
|
// Example: Assuming we start from the following vectors:
|
|
// Matrix[0]= a0 b0 c0 a1 b1 c1 a2 b2
|
|
// Matrix[1]= c2 a3 b3 c3 a4 b4 c4 a5
|
|
// Matrix[2]= b5 c5 a6 b6 c6 a7 b7 c7
|
|
|
|
TransposedMatrix.resize(3);
|
|
SmallVector<int, 32> VPShuf;
|
|
SmallVector<int, 32> VPAlign[2];
|
|
SmallVector<int, 32> VPAlign2;
|
|
SmallVector<int, 32> VPAlign3;
|
|
SmallVector<int, 3> GroupSize;
|
|
Value *Vec[6], *TempVector[3];
|
|
|
|
MVT VT = MVT::getVT(Shuffles[0]->getType());
|
|
|
|
createShuffleStride(VT, 3, VPShuf);
|
|
setGroupSize(VT, GroupSize);
|
|
|
|
for (int i = 0; i < 2; i++)
|
|
DecodePALIGNRMask(VT, GroupSize[2 - i], VPAlign[i], false);
|
|
|
|
DecodePALIGNRMask(VT, GroupSize[2] + GroupSize[1], VPAlign2, true, true);
|
|
DecodePALIGNRMask(VT, GroupSize[1], VPAlign3, true, true);
|
|
|
|
concatSubVector(Vec, InVec, VecElems, Builder);
|
|
// Vec[0]= a0 a1 a2 b0 b1 b2 c0 c1
|
|
// Vec[1]= c2 c3 c4 a3 a4 a5 b3 b4
|
|
// Vec[2]= b5 b6 b7 c5 c6 c7 a6 a7
|
|
|
|
for (int i = 0; i < 3; i++)
|
|
Vec[i] = Builder.CreateShuffleVector(Vec[i], VPShuf);
|
|
|
|
// TempVector[0]= a6 a7 a0 a1 a2 b0 b1 b2
|
|
// TempVector[1]= c0 c1 c2 c3 c4 a3 a4 a5
|
|
// TempVector[2]= b3 b4 b5 b6 b7 c5 c6 c7
|
|
|
|
for (int i = 0; i < 3; i++)
|
|
TempVector[i] =
|
|
Builder.CreateShuffleVector(Vec[(i + 2) % 3], Vec[i], VPAlign[0]);
|
|
|
|
// Vec[0]= a3 a4 a5 a6 a7 a0 a1 a2
|
|
// Vec[1]= c5 c6 c7 c0 c1 c2 c3 c4
|
|
// Vec[2]= b0 b1 b2 b3 b4 b5 b6 b7
|
|
|
|
for (int i = 0; i < 3; i++)
|
|
Vec[i] = Builder.CreateShuffleVector(TempVector[(i + 1) % 3], TempVector[i],
|
|
VPAlign[1]);
|
|
|
|
// TransposedMatrix[0]= a0 a1 a2 a3 a4 a5 a6 a7
|
|
// TransposedMatrix[1]= b0 b1 b2 b3 b4 b5 b6 b7
|
|
// TransposedMatrix[2]= c0 c1 c2 c3 c4 c5 c6 c7
|
|
|
|
Value *TempVec = Builder.CreateShuffleVector(Vec[1], VPAlign3);
|
|
TransposedMatrix[0] = Builder.CreateShuffleVector(Vec[0], VPAlign2);
|
|
TransposedMatrix[1] = VecElems == 8 ? Vec[2] : TempVec;
|
|
TransposedMatrix[2] = VecElems == 8 ? TempVec : Vec[2];
|
|
}
|
|
|
|
// group2Shuffle reorder the shuffle stride back into continuous order.
|
|
// For example For VF16 with Mask1 = {0,3,6,9,12,15,2,5,8,11,14,1,4,7,10,13} =>
|
|
// MaskResult = {0,11,6,1,12,7,2,13,8,3,14,9,4,15,10,5}.
|
|
static void group2Shuffle(MVT VT, SmallVectorImpl<int> &Mask,
|
|
SmallVectorImpl<int> &Output) {
|
|
int IndexGroup[3] = {0, 0, 0};
|
|
int Index = 0;
|
|
int VectorWidth = VT.getSizeInBits();
|
|
int VF = VT.getVectorNumElements();
|
|
// Find the index of the different groups.
|
|
int Lane = (VectorWidth / 128 > 0) ? VectorWidth / 128 : 1;
|
|
for (int i = 0; i < 3; i++) {
|
|
IndexGroup[(Index * 3) % (VF / Lane)] = Index;
|
|
Index += Mask[i];
|
|
}
|
|
// According to the index compute the convert mask.
|
|
for (int i = 0; i < VF / Lane; i++) {
|
|
Output.push_back(IndexGroup[i % 3]);
|
|
IndexGroup[i % 3]++;
|
|
}
|
|
}
|
|
|
|
void X86InterleavedAccessGroup::interleave8bitStride3(
|
|
ArrayRef<Instruction *> InVec, SmallVectorImpl<Value *> &TransposedMatrix,
|
|
unsigned VecElems) {
|
|
// Example: Assuming we start from the following vectors:
|
|
// Matrix[0]= a0 a1 a2 a3 a4 a5 a6 a7
|
|
// Matrix[1]= b0 b1 b2 b3 b4 b5 b6 b7
|
|
// Matrix[2]= c0 c1 c2 c3 c3 a7 b7 c7
|
|
|
|
TransposedMatrix.resize(3);
|
|
SmallVector<int, 3> GroupSize;
|
|
SmallVector<int, 32> VPShuf;
|
|
SmallVector<int, 32> VPAlign[3];
|
|
SmallVector<int, 32> VPAlign2;
|
|
SmallVector<int, 32> VPAlign3;
|
|
|
|
Value *Vec[3], *TempVector[3];
|
|
MVT VT = MVT::getVectorVT(MVT::i8, VecElems);
|
|
|
|
setGroupSize(VT, GroupSize);
|
|
|
|
for (int i = 0; i < 3; i++)
|
|
DecodePALIGNRMask(VT, GroupSize[i], VPAlign[i]);
|
|
|
|
DecodePALIGNRMask(VT, GroupSize[1] + GroupSize[2], VPAlign2, false, true);
|
|
DecodePALIGNRMask(VT, GroupSize[1], VPAlign3, false, true);
|
|
|
|
// Vec[0]= a3 a4 a5 a6 a7 a0 a1 a2
|
|
// Vec[1]= c5 c6 c7 c0 c1 c2 c3 c4
|
|
// Vec[2]= b0 b1 b2 b3 b4 b5 b6 b7
|
|
|
|
Vec[0] = Builder.CreateShuffleVector(InVec[0], VPAlign2);
|
|
Vec[1] = Builder.CreateShuffleVector(InVec[1], VPAlign3);
|
|
Vec[2] = InVec[2];
|
|
|
|
// Vec[0]= a6 a7 a0 a1 a2 b0 b1 b2
|
|
// Vec[1]= c0 c1 c2 c3 c4 a3 a4 a5
|
|
// Vec[2]= b3 b4 b5 b6 b7 c5 c6 c7
|
|
|
|
for (int i = 0; i < 3; i++)
|
|
TempVector[i] =
|
|
Builder.CreateShuffleVector(Vec[i], Vec[(i + 2) % 3], VPAlign[1]);
|
|
|
|
// Vec[0]= a0 a1 a2 b0 b1 b2 c0 c1
|
|
// Vec[1]= c2 c3 c4 a3 a4 a5 b3 b4
|
|
// Vec[2]= b5 b6 b7 c5 c6 c7 a6 a7
|
|
|
|
for (int i = 0; i < 3; i++)
|
|
Vec[i] = Builder.CreateShuffleVector(TempVector[i], TempVector[(i + 1) % 3],
|
|
VPAlign[2]);
|
|
|
|
// TransposedMatrix[0] = a0 b0 c0 a1 b1 c1 a2 b2
|
|
// TransposedMatrix[1] = c2 a3 b3 c3 a4 b4 c4 a5
|
|
// TransposedMatrix[2] = b5 c5 a6 b6 c6 a7 b7 c7
|
|
|
|
unsigned NumOfElm = VT.getVectorNumElements();
|
|
group2Shuffle(VT, GroupSize, VPShuf);
|
|
reorderSubVector(VT, TransposedMatrix, Vec, VPShuf, NumOfElm, 3, Builder);
|
|
}
|
|
|
|
void X86InterleavedAccessGroup::transpose_4x4(
|
|
ArrayRef<Instruction *> Matrix,
|
|
SmallVectorImpl<Value *> &TransposedMatrix) {
|
|
assert(Matrix.size() == 4 && "Invalid matrix size");
|
|
TransposedMatrix.resize(4);
|
|
|
|
// dst = src1[0,1],src2[0,1]
|
|
static constexpr int IntMask1[] = {0, 1, 4, 5};
|
|
ArrayRef<int> Mask = makeArrayRef(IntMask1, 4);
|
|
Value *IntrVec1 = Builder.CreateShuffleVector(Matrix[0], Matrix[2], Mask);
|
|
Value *IntrVec2 = Builder.CreateShuffleVector(Matrix[1], Matrix[3], Mask);
|
|
|
|
// dst = src1[2,3],src2[2,3]
|
|
static constexpr int IntMask2[] = {2, 3, 6, 7};
|
|
Mask = makeArrayRef(IntMask2, 4);
|
|
Value *IntrVec3 = Builder.CreateShuffleVector(Matrix[0], Matrix[2], Mask);
|
|
Value *IntrVec4 = Builder.CreateShuffleVector(Matrix[1], Matrix[3], Mask);
|
|
|
|
// dst = src1[0],src2[0],src1[2],src2[2]
|
|
static constexpr int IntMask3[] = {0, 4, 2, 6};
|
|
Mask = makeArrayRef(IntMask3, 4);
|
|
TransposedMatrix[0] = Builder.CreateShuffleVector(IntrVec1, IntrVec2, Mask);
|
|
TransposedMatrix[2] = Builder.CreateShuffleVector(IntrVec3, IntrVec4, Mask);
|
|
|
|
// dst = src1[1],src2[1],src1[3],src2[3]
|
|
static constexpr int IntMask4[] = {1, 5, 3, 7};
|
|
Mask = makeArrayRef(IntMask4, 4);
|
|
TransposedMatrix[1] = Builder.CreateShuffleVector(IntrVec1, IntrVec2, Mask);
|
|
TransposedMatrix[3] = Builder.CreateShuffleVector(IntrVec3, IntrVec4, Mask);
|
|
}
|
|
|
|
// Lowers this interleaved access group into X86-specific
|
|
// instructions/intrinsics.
|
|
bool X86InterleavedAccessGroup::lowerIntoOptimizedSequence() {
|
|
SmallVector<Instruction *, 4> DecomposedVectors;
|
|
SmallVector<Value *, 4> TransposedVectors;
|
|
auto *ShuffleTy = cast<FixedVectorType>(Shuffles[0]->getType());
|
|
|
|
if (isa<LoadInst>(Inst)) {
|
|
auto *ShuffleEltTy = cast<FixedVectorType>(Inst->getType());
|
|
unsigned NumSubVecElems = ShuffleEltTy->getNumElements() / Factor;
|
|
switch (NumSubVecElems) {
|
|
default:
|
|
return false;
|
|
case 4:
|
|
case 8:
|
|
case 16:
|
|
case 32:
|
|
case 64:
|
|
if (ShuffleTy->getNumElements() != NumSubVecElems)
|
|
return false;
|
|
break;
|
|
}
|
|
|
|
// Try to generate target-sized register(/instruction).
|
|
decompose(Inst, Factor, ShuffleTy, DecomposedVectors);
|
|
|
|
// Perform matrix-transposition in order to compute interleaved
|
|
// results by generating some sort of (optimized) target-specific
|
|
// instructions.
|
|
|
|
if (NumSubVecElems == 4)
|
|
transpose_4x4(DecomposedVectors, TransposedVectors);
|
|
else
|
|
deinterleave8bitStride3(DecomposedVectors, TransposedVectors,
|
|
NumSubVecElems);
|
|
|
|
// Now replace the unoptimized-interleaved-vectors with the
|
|
// transposed-interleaved vectors.
|
|
for (unsigned i = 0, e = Shuffles.size(); i < e; ++i)
|
|
Shuffles[i]->replaceAllUsesWith(TransposedVectors[Indices[i]]);
|
|
|
|
return true;
|
|
}
|
|
|
|
Type *ShuffleEltTy = ShuffleTy->getElementType();
|
|
unsigned NumSubVecElems = ShuffleTy->getNumElements() / Factor;
|
|
|
|
// Lower the interleaved stores:
|
|
// 1. Decompose the interleaved wide shuffle into individual shuffle
|
|
// vectors.
|
|
decompose(Shuffles[0], Factor,
|
|
FixedVectorType::get(ShuffleEltTy, NumSubVecElems),
|
|
DecomposedVectors);
|
|
|
|
// 2. Transpose the interleaved-vectors into vectors of contiguous
|
|
// elements.
|
|
switch (NumSubVecElems) {
|
|
case 4:
|
|
transpose_4x4(DecomposedVectors, TransposedVectors);
|
|
break;
|
|
case 8:
|
|
interleave8bitStride4VF8(DecomposedVectors, TransposedVectors);
|
|
break;
|
|
case 16:
|
|
case 32:
|
|
case 64:
|
|
if (Factor == 4)
|
|
interleave8bitStride4(DecomposedVectors, TransposedVectors,
|
|
NumSubVecElems);
|
|
if (Factor == 3)
|
|
interleave8bitStride3(DecomposedVectors, TransposedVectors,
|
|
NumSubVecElems);
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
// 3. Concatenate the contiguous-vectors back into a wide vector.
|
|
Value *WideVec = concatenateVectors(Builder, TransposedVectors);
|
|
|
|
// 4. Generate a store instruction for wide-vec.
|
|
StoreInst *SI = cast<StoreInst>(Inst);
|
|
Builder.CreateAlignedStore(WideVec, SI->getPointerOperand(), SI->getAlign());
|
|
|
|
return true;
|
|
}
|
|
|
|
// Lower interleaved load(s) into target specific instructions/
|
|
// intrinsics. Lowering sequence varies depending on the vector-types, factor,
|
|
// number of shuffles and ISA.
|
|
// Currently, lowering is supported for 4x64 bits with Factor = 4 on AVX.
|
|
bool X86TargetLowering::lowerInterleavedLoad(
|
|
LoadInst *LI, ArrayRef<ShuffleVectorInst *> Shuffles,
|
|
ArrayRef<unsigned> Indices, unsigned Factor) const {
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assert(Factor >= 2 && Factor <= getMaxSupportedInterleaveFactor() &&
|
|
"Invalid interleave factor");
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|
assert(!Shuffles.empty() && "Empty shufflevector input");
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|
assert(Shuffles.size() == Indices.size() &&
|
|
"Unmatched number of shufflevectors and indices");
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|
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// Create an interleaved access group.
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|
IRBuilder<> Builder(LI);
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X86InterleavedAccessGroup Grp(LI, Shuffles, Indices, Factor, Subtarget,
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|
Builder);
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|
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|
return Grp.isSupported() && Grp.lowerIntoOptimizedSequence();
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|
}
|
|
|
|
bool X86TargetLowering::lowerInterleavedStore(StoreInst *SI,
|
|
ShuffleVectorInst *SVI,
|
|
unsigned Factor) const {
|
|
assert(Factor >= 2 && Factor <= getMaxSupportedInterleaveFactor() &&
|
|
"Invalid interleave factor");
|
|
|
|
assert(cast<FixedVectorType>(SVI->getType())->getNumElements() % Factor ==
|
|
0 &&
|
|
"Invalid interleaved store");
|
|
|
|
// Holds the indices of SVI that correspond to the starting index of each
|
|
// interleaved shuffle.
|
|
SmallVector<unsigned, 4> Indices;
|
|
auto Mask = SVI->getShuffleMask();
|
|
for (unsigned i = 0; i < Factor; i++)
|
|
Indices.push_back(Mask[i]);
|
|
|
|
ArrayRef<ShuffleVectorInst *> Shuffles = makeArrayRef(SVI);
|
|
|
|
// Create an interleaved access group.
|
|
IRBuilder<> Builder(SI);
|
|
X86InterleavedAccessGroup Grp(SI, Shuffles, Indices, Factor, Subtarget,
|
|
Builder);
|
|
|
|
return Grp.isSupported() && Grp.lowerIntoOptimizedSequence();
|
|
}
|