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/*
* Copyright (c) Facebook, Inc. and its affiliates.
* All rights reserved.
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree.
*/
#pragma once
#include <asmjit/asmjit.h>
#include <cpuinfo.h>
#include <map>
#include <tuple>
#include "fbgemm/Fbgemm.h"
namespace fbgemm {
namespace x86 = asmjit::x86;
/**
* @brief AVX2/AVX512 JIT assembly code generator.
* @tparam TA Type of matrix A.
* @tparam TB Type of matrix B.
* @tparam TC Type of matrix C.
* @tparam accT Accumulation type, currently we support 16-bit (std::int16_t) or
* 32-bit (std::int32_t) accumulation.
*/
template <typename TA, typename TB, typename TC, typename accT>
class CodeGenBase {
public:
using jit_micro_kernel_fp = void (*)(
TA* bufferA,
TB* bufferB,
TB* b_pf,
TC* bufferC,
int kc,
int ldc);
/**
* @brief Constructor for initializing AVX2/AVX512 registers.
*/
CodeGenBase()
: CRegs_avx2_{x86::ymm0,
x86::ymm1,
x86::ymm2,
x86::ymm3,
x86::ymm4,
x86::ymm5,
x86::ymm6,
x86::ymm7,
x86::ymm8,
x86::ymm9,
x86::ymm10,
x86::ymm11},
CRegs_avx512_{
x86::zmm0, x86::zmm1, x86::zmm2, x86::zmm3, x86::zmm4,
x86::zmm5, x86::zmm6, x86::zmm7, x86::zmm8, x86::zmm9,
x86::zmm10, x86::zmm11, x86::zmm12, x86::zmm13, x86::zmm14,
x86::zmm15, x86::zmm16, x86::zmm17, x86::zmm18, x86::zmm19,
x86::zmm20, x86::zmm21, x86::zmm22, x86::zmm23, x86::zmm24,
x86::zmm25, x86::zmm26, x86::zmm27,
} {
// vector width in bits
if (cpuinfo_initialize()) {
if (cpuinfo_has_x86_avx512f()) {
vectorWidth_ = 512;
} else if (cpuinfo_has_x86_avx2()) {
vectorWidth_ = 256;
} else {
// TODO: Have default path
assert(0 && "unsupported architecture");
return;
}
} else {
throw std::runtime_error("Failed to initialize cpuinfo!");
}
// vector width in elements
VLEN_ = vectorWidth_ / 8 * sizeof(TA);
}
/**
* @brief Get or Create the instructions for macro-kernel.
*
* If the problem size (mc, nc) and accumulation flag (accum) can be found in
* the code cache (a hash map), then get the macro-kernel instructions
* directly from it. Otherwise, create the instructions for macro-kernel, and
* store that into the code cache.
*/
template <inst_set_t instSet>
jit_micro_kernel_fp
getOrCreate(bool accum, int32_t mc, int32_t nc, int32_t kc, int32_t ldc);
/**
* @brief Generate instructions for initializing the C registers to 0.
*/
template <inst_set_t instSet>
void initCRegs(
asmjit::X86Emitter* a,
int rowRegs,
int colRegs,
int leadingDimCRegAssign = 4);
/**
* @brief Generate instructions for computing block in the rank-k update.
*/
template <inst_set_t instSet>
void genComputeBlock(
asmjit::X86Emitter* a,
asmjit::X86Gp buffer_A,
asmjit::X86Gp buffer_B,
asmjit::X86Gp B_pf,
int rowRegs,
int colRegs,
int lda,
int leadingDimCRegAssign = 4);
/**
* @brief Generate instructions for storing the C registers back to the
* memory.
*/
template <inst_set_t instSet>
void storeCRegs(
asmjit::X86Emitter* a,
int rowRegs,
int colRegs,
asmjit::X86Gp C_Offset,
asmjit::X86Gp ldcReg,
bool accum,
int leadingDimCRegAssign = 4);
private:
asmjit::X86Ymm
CRegs_avx2_[12]; ///< AVX2 ymm registers for C in the micro-kernel.
asmjit::X86Zmm
CRegs_avx512_[28]; ///< AVX512 zmm registers for C in the micro-kernel.
int vectorWidth_; ///< Vector width in bits.
int VLEN_; ///< Vector width in elements.
static thread_local asmjit::JitRuntime rt_; ///< JIT Runtime for asmjit.
static thread_local asmjit::CodeHolder code_; ///< JIT Code Holder for asmjit.
static thread_local std::map<std::tuple<bool, int, int>, jit_micro_kernel_fp>
codeCache_; ///< JIT Code Cache for reuse.
};
template <typename TA, typename TB, typename TC, typename accT>
thread_local asmjit::JitRuntime CodeGenBase<TA, TB, TC, accT>::rt_;
template <typename TA, typename TB, typename TC, typename accT>
thread_local asmjit::CodeHolder CodeGenBase<TA, TB, TC, accT>::code_;
template <typename TA, typename TB, typename TC, typename accT>
thread_local std::map<
std::tuple<bool, int, int>,
typename CodeGenBase<TA, TB, TC, accT>::jit_micro_kernel_fp>
CodeGenBase<TA, TB, TC, accT>::codeCache_;
} // namespace fbgemm
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