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QuantUtilsAvx2.cc
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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.
*/
#define FBGEMM_EXPORTS
#include "fbgemm/QuantUtilsAvx2.h"
#include <immintrin.h>
#include <algorithm> //for std::min/std::max
#include <cmath> //for nearbyint
#include <limits> //for numeric_limits
#include "./MaskAvx2.h"
#include "fbgemm/Fbgemm.h" //for ReQuantizeOutput
namespace fbgemm {
using namespace std;
////////////////////////////////////////////////////////////////////////////////
// Utility functions
// ASAN seems to have a false-positive for _mm_maskmoveu_si128
template <typename T, bool LEGACY>
void NO_SANITIZE("address") QuantizeAvx2(
const float* src,
T* dst,
int len,
const TensorQuantizationParams& qparams) {
#if defined(__AVX2__) && (defined(__FMA__) || defined(_MSC_VER))
constexpr int VLEN = 8;
constexpr int32_t min_val = std::numeric_limits<T>::min();
constexpr int32_t max_val = std::numeric_limits<T>::max();
// This is the largest int32 value less than int32_max
// that is exactly representable in float
constexpr int32_t int32_float_max_val =
std::numeric_limits<int32_t>::max() - 127;
std::size_t i = 0;
float inverse_scale = 1.f / qparams.scale;
__m256 inverse_scale_v = _mm256_set1_ps(inverse_scale);
// clang-format off
__m256i shuffle_mask_v = _mm256_set_epi8(
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0x0c, 0x08, 0x04, 0x00,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0x0c, 0x08, 0x04, 0x00);
// clang-format on
__m256i permute_mask_v =
_mm256_set_epi32(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00);
for (; i < len / VLEN * VLEN; i += VLEN) {
__m256 src_v = _mm256_loadu_ps(src + i);
__m256 transformed_v;
if (LEGACY) { // static if
transformed_v = _mm256_fmadd_ps(
src_v, inverse_scale_v, _mm256_set1_ps(qparams.zero_point));
} else {
transformed_v = _mm256_mul_ps(src_v, inverse_scale_v);
}
// If the floating point value is greater than int32_max,
// _mm256_cvtps_epi32 converts them to negative. Clip at int32_float_max_val
// to avoid this.
transformed_v =
_mm256_min_ps(transformed_v, _mm256_set1_ps(int32_float_max_val));
__m256i rounded_v = _mm256_cvtps_epi32(transformed_v);
if (!LEGACY) {
rounded_v =
_mm256_add_epi32(rounded_v, _mm256_set1_epi32(qparams.zero_point));
}
__m256i clipped_v = _mm256_min_epi32(
_mm256_max_epi32(rounded_v, _mm256_set1_epi32(min_val)),
_mm256_set1_epi32(max_val));
// An instruction sequence to save 8 32-bit integers as 8 8-bit integers
clipped_v = _mm256_shuffle_epi8(clipped_v, shuffle_mask_v);
clipped_v = _mm256_permutevar8x32_epi32(clipped_v, permute_mask_v);
_mm_storel_epi64(
reinterpret_cast<__m128i*>(dst + i), _mm256_castsi256_si128(clipped_v));
}
// Handle remainder using mask instructions so that
// the main loop and remainder loop have the same behavior
int rem = len - i;
if (rem > 0) {
__m256i mask_v = _mm256_load_si256(reinterpret_cast<const __m256i*>(
internal::avx2_ps_or_epi32_masks[rem]));
__m128i store_mask_v = _mm_load_si128(
reinterpret_cast<const __m128i*>(internal::sse_epi8_masks[rem]));
__m256 src_v = _mm256_maskload_ps(src + i, mask_v);
__m256 transformed_v;
if (LEGACY) {
transformed_v = _mm256_fmadd_ps(
src_v, inverse_scale_v, _mm256_set1_ps(qparams.zero_point));
} else {
transformed_v = _mm256_mul_ps(src_v, inverse_scale_v);
}
transformed_v =
_mm256_min_ps(transformed_v, _mm256_set1_ps(int32_float_max_val));
__m256i rounded_v = _mm256_cvtps_epi32(transformed_v);
if (!LEGACY) {
rounded_v =
_mm256_add_epi32(rounded_v, _mm256_set1_epi32(qparams.zero_point));
}
__m256i clipped_v = _mm256_min_epi32(
_mm256_max_epi32(rounded_v, _mm256_set1_epi32(min_val)),
_mm256_set1_epi32(max_val));
// An instruction sequence to save "rem" number of 32-bit integers
// as "rem" number of 8-bit integers
clipped_v = _mm256_shuffle_epi8(clipped_v, shuffle_mask_v);
clipped_v = _mm256_permutevar8x32_epi32(clipped_v, permute_mask_v);
_mm_maskmoveu_si128(
_mm256_castsi256_si128(clipped_v),
store_mask_v,
reinterpret_cast<char*>(dst + i));
}
#endif
}
// Instantiate QuantizeAvx2 for known datatypes
#define SPECIALIZE_QUANTIZEAVX2(T, LEGACY) \
template void QuantizeAvx2<T, LEGACY>( \
const float* src, \
T* dst, \
int len, \
const TensorQuantizationParams& qparams);
SPECIALIZE_QUANTIZEAVX2(uint8_t, true)
SPECIALIZE_QUANTIZEAVX2(int8_t, true)
SPECIALIZE_QUANTIZEAVX2(uint8_t, false)
SPECIALIZE_QUANTIZEAVX2(int8_t, false)
#undef SPECIALIZE_QUANTIZEAVX2
template <typename T>
void NO_SANITIZE("address") FusedQuantizeDequantizeAvx2(
const float* src,
float* dst,
int len,
const TensorQuantizationParams& qparams) {
float inverse_scale = 1.f / qparams.scale;
constexpr int32_t min_val = std::numeric_limits<T>::min();
constexpr int32_t max_val = std::numeric_limits<T>::max();
#if defined(__AVX2__) && (defined(__FMA__) || defined(_MSC_VER))
constexpr int VLEN = 8;
// This is the largest int32 value less than int32_max
// that is exactly representable in float
constexpr int32_t int32_float_max_val =
std::numeric_limits<int32_t>::max() - 127;
std::size_t i = 0;
__m256 inverse_scale_v = _mm256_set1_ps(inverse_scale);
__m256 scale_v = _mm256_set1_ps(qparams.scale);
__m256 zp_v = _mm256_set1_ps(qparams.zero_point);
for (; i < len / VLEN * VLEN; i += VLEN) {
// prefetch src and dst
_mm_prefetch(reinterpret_cast<const char*>(src + i + VLEN), _MM_HINT_T0);
_mm_prefetch(reinterpret_cast<const char*>(dst + i + VLEN), _MM_HINT_T0);
__m256 src_v = _mm256_loadu_ps(src + i);
__m256 transformed_v;
transformed_v = _mm256_mul_ps(src_v, inverse_scale_v);
// If the floating point value is greater than int32_max,
// _mm256_cvtps_epi32 converts them to negative. Clip at int32_float_max_val
// to avoid this.
transformed_v =
_mm256_min_ps(transformed_v, _mm256_set1_ps(int32_float_max_val));
__m256i rounded_v = _mm256_cvtps_epi32(transformed_v);
rounded_v =
_mm256_add_epi32(rounded_v, _mm256_set1_epi32(qparams.zero_point));
__m256i clipped_v = _mm256_min_epi32(
_mm256_max_epi32(rounded_v, _mm256_set1_epi32(min_val)),
_mm256_set1_epi32(max_val));
// convert int32 to float32
__m256 fp32_clipped_v = _mm256_cvtepi32_ps(clipped_v);
// minus zero point, multiply by scale
__m256 fp32_dq_sub = _mm256_sub_ps(fp32_clipped_v, zp_v);
__m256 fp32_dq = _mm256_mul_ps(fp32_dq_sub, scale_v);
// save fusued quantize-dequantize fp32 values into dst
_mm256_storeu_ps(dst + i, fp32_dq);
}
// Handle remainder using mask instructions so that
// the main loop and remainder loop have the same behavior
int rem = len - i;
if (rem > 0) {
__m256i mask_v = _mm256_load_si256(reinterpret_cast<const __m256i*>(
internal::avx2_ps_or_epi32_masks[rem]));
__m256 src_v = _mm256_maskload_ps(src + i, mask_v);
__m256 transformed_v;
transformed_v = _mm256_mul_ps(src_v, inverse_scale_v);
// If the floating point value is greater than int32_max,
// _mm256_cvtps_epi32 converts them to negative. Clip at int32_float_max_val
// to avoid this.
transformed_v =
_mm256_min_ps(transformed_v, _mm256_set1_ps(int32_float_max_val));
__m256i rounded_v = _mm256_cvtps_epi32(transformed_v);
rounded_v =
_mm256_add_epi32(rounded_v, _mm256_set1_epi32(qparams.zero_point));
__m256i clipped_v = _mm256_min_epi32(
_mm256_max_epi32(rounded_v, _mm256_set1_epi32(min_val)),
_mm256_set1_epi32(max_val));
// convert int32 to float32
__m256 fp32_clipped_v = _mm256_cvtepi32_ps(clipped_v);
// minus zero point, multiply by scale
__m256 fp32_dq_sub =
_mm256_sub_ps(fp32_clipped_v, _mm256_set1_ps(qparams.zero_point));
__m256 fp32_dq = _mm256_mul_ps(fp32_dq_sub, _mm256_set1_ps(qparams.scale));
// store fp32 values with mask
_mm256_maskstore_ps(dst + i, mask_v, fp32_dq);
}
#endif
}
// Instantiate QuantizeAvx2 for known datatypes
#define SPECIALIZE_FUSEDDQAVX2(T) \
template void FusedQuantizeDequantizeAvx2<T>( \
const float* src, \
float* dst, \
int len, \
const TensorQuantizationParams& qparams);
SPECIALIZE_FUSEDDQAVX2(uint8_t)
SPECIALIZE_FUSEDDQAVX2(int8_t)
#undef SPECIALIZE_FUSEDDQAVX2
void FindMinMax(const float* a, float* min, float* max, int len) {
if (len <= 0) {
*min = 0.0f;
*max = 0.0f;
return;
}
float temp_min = *a, temp_max = *a;
int i = 0;
#ifdef __AVX__
__m256 min_v = _mm256_set1_ps(*a), max_v = _mm256_set1_ps(*a);
constexpr int VLEN = 8;
if (len >= VLEN) {
for (; i < len / VLEN * VLEN; i += VLEN) {
min_v = _mm256_min_ps(min_v, _mm256_loadu_ps(a + i));
max_v = _mm256_max_ps(max_v, _mm256_loadu_ps(a + i));
}
float min_buf[VLEN], max_buf[VLEN];
_mm256_storeu_ps(min_buf, min_v);
_mm256_storeu_ps(max_buf, max_v);
for (int j = 0; j < VLEN; ++j) {
temp_min = std::min(temp_min, min_buf[j]);
temp_max = std::max(temp_max, max_buf[j]);
}
}
#endif
for (; i < len; i++) {
temp_min = std::min(temp_min, a[i]);
temp_max = std::max(temp_max, a[i]);
}
*min = temp_min;
*max = temp_max;
}
////////////////////////////////////////////////////////////////////////////////
// Requantization (with floats)
#ifdef __AVX2__
void RequantizeAvx2(
const int32_t* src,
uint8_t* dst,
int len,
const RequantizationParams& params) {
DoNothing<> doNothingObj{};
int32_t Bq_zero_point[] = {0};
ReQuantizeOutput<false /* FUSE_RELU */> requantizeObj(
doNothingObj,
¶ms.real_multiplier,
params.target_qparams.zero_point,
0, // Aq_zero_point
Bq_zero_point, // Bq_zero_point
nullptr, // row_offsets
nullptr, // col_offsets
nullptr, // bias
len); // ncol
requantizeObj.f<inst_set_t::avx2>(dst, src, {0, 1, 0, len}, 0, 0);
}
void RequantizeFixedPointAvx2(
const int32_t* src,
uint8_t* dst,
int len,
const RequantizationParams& params) {
constexpr int VLEN = 8;
__m256i b = _mm256_set1_epi32(params.multiplier);
// AVX2 doesn't support arithmetic right shift.
// As a work around, we convert 64-bit multiplied results to uint64_t by
// adding 0x8000000000000000ULL, logical right shift, and subtract by
// (0x8000000000000000ULL >> right_shift).
__m256i pre_shift_nudge = _mm256_set1_epi64x(
(1ll << (params.right_shift - 1)) + 0x8000000000000000ULL);
__m256i post_shift_nudge = _mm256_set1_epi64x(
params.target_qparams.zero_point -
(0x8000000000000000ULL >> params.right_shift));
__m256i min_v = _mm256_set1_epi32(numeric_limits<uint8_t>::min());
__m256i max_v = _mm256_set1_epi32(numeric_limits<uint8_t>::max());
__m256i shuffle_mask_v = _mm256_set_epi8(
0xff,
0xff,
0xff,
0xff,
0xff,
0xff,
0xff,
0xff,
0xff,
0xff,
0xff,
0xff,
0x0c,
0x08,
0x04,
0x00,
0xff,
0xff,
0xff,
0xff,
0xff,
0xff,
0xff,
0xff,
0xff,
0xff,
0xff,
0xff,
0x0c,
0x08,
0x04,
0x00);
__m256i permute_mask_v =
_mm256_set_epi32(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00);
int i = 0;
for (; i < len / VLEN * VLEN; i += VLEN) {
__m256i a_v = _mm256_loadu_si256((const __m256i*)(src + i));
// a = a0 | a1 | a2 | a3 | a4 | a5 | a6 | a7
// b = b0 | b1 | b3 | b3 | b4 | b5 | b6 | b7
__m256i a_even_v = a_v;
__m256i a_odd_v = _mm256_srli_si256(a_v, 4);
__m256i ab_even_v = _mm256_mul_epi32(a_even_v, b);
__m256i ab_odd_v = _mm256_mul_epi32(a_odd_v, b);
__m256i even_rounded_v = _mm256_add_epi64(ab_even_v, pre_shift_nudge);
__m256i odd_rounded_v = _mm256_add_epi64(ab_odd_v, pre_shift_nudge);
__m256i even_result_v = _mm256_add_epi64(
_mm256_srli_epi64(even_rounded_v, params.right_shift),
post_shift_nudge);
__m256i odd_result_v = _mm256_add_epi64(
_mm256_srli_epi64(odd_rounded_v, params.right_shift), post_shift_nudge);
odd_result_v = _mm256_slli_si256(odd_result_v, 4);
// even_result_v has numbers we want in its even 32-bit SIMD lanes, and
// odd_result_v has numbers we want in its odd 32-bit SIMD lanes.
// Use blend to combine them.
__m256i result_v = _mm256_blend_epi32(even_result_v, odd_result_v, 0xaa);
__m256i clipped_v =
_mm256_max_epi32(min_v, _mm256_min_epi32(max_v, result_v));
clipped_v = _mm256_shuffle_epi8(clipped_v, shuffle_mask_v);
clipped_v = _mm256_permutevar8x32_epi32(clipped_v, permute_mask_v);
*(int64_t*)(dst + i) = _mm256_extract_epi64(clipped_v, 0);
}
for (; i < len; ++i) {
int64_t ab_64 =
static_cast<int64_t>(src[i]) * static_cast<int64_t>(params.multiplier);
int64_t nudge = 1ll << std::max(0, params.right_shift - 1);
int64_t quantized_down = params.target_qparams.zero_point +
((ab_64 + nudge) >> params.right_shift);
dst[i] = std::min<int64_t>(std::max<int64_t>(quantized_down, 0l), 255l);
}
}
#endif
template <
bool A_SYMMETRIC,
bool B_SYMMETRIC,
QuantizationGranularity Q_GRAN,
bool HAS_BIAS,
bool FUSE_RELU,
typename BIAS_TYPE>
void requantizeOutputProcessingAvx2(
uint8_t* out,
const int32_t* inp,
const block_type_t& block,
int ld_out,
int ld_in,
const requantizationParams_t<BIAS_TYPE>& r) {
// Adoption of implementation at QNNPACK/src/requantization/fp32-sse2.c
// using AVX2 instructions
int quant_param_idx = 0;
if (Q_GRAN == QuantizationGranularity::GROUP) {
int ncol_per_group = r.ncols / r.groups;
int g = block.col_start / ncol_per_group;
quant_param_idx = g;
}
__m256 multiplier_v = _mm256_set1_ps(r.C_multiplier[quant_param_idx]);
// Broadcasted reciprocal of act_times_w_scale
__m256 act_times_w_rcp_v;
if (!(Q_GRAN == QuantizationGranularity::OUT_CHANNEL)) {
if (is_same<BIAS_TYPE, float>::value) {
act_times_w_rcp_v =
_mm256_set1_ps(1.0 / r.act_times_w_scale[quant_param_idx]);
}
}
__m256i min_v = _mm256_set1_epi8(static_cast<uint8_t>(0));
__m256i max_v = _mm256_set1_epi8(static_cast<uint8_t>(255));
assert(
(A_SYMMETRIC == (r.A_zero_point == 0)) &&
"A_SYMMETRIC == true if and only if A_zero_point == 0");
assert(
(B_SYMMETRIC ==
((Q_GRAN == QuantizationGranularity::TENSOR && r.B_zero_point[0] == 0) ||
r.row_offsets == nullptr)) &&
"B_SYMMETRIC == true if and only if B_zero_point == 0 "
"or r.row_offsets == nullptr");
assert(
(HAS_BIAS == (r.bias != nullptr)) &&
"HAS_BIAS == true if and only if bias != nullptr");
__m256i A_zero_point_v = _mm256_set1_epi32(r.A_zero_point);
__m256i C_zero_point_epi16_v = _mm256_set1_epi16(r.C_zero_point);
__m256i C_zero_point_epi8_v = _mm256_set1_epi8(r.C_zero_point);
__m256i permute_mask_v =
_mm256_set_epi32(0x07, 0x03, 0x06, 0x02, 0x05, 0x01, 0x04, 0x00);
constexpr int VLEN = 8;
for (int i = block.row_start; i < block.row_start + block.row_size; ++i) {
// Scale row_offset with Bq_zero_point
int32_t row_offset = 0;
if (B_SYMMETRIC) {
row_offset = 0;
} else if (
Q_GRAN == QuantizationGranularity::TENSOR ||
Q_GRAN == QuantizationGranularity::GROUP) {
row_offset =
r.row_offsets[i - block.row_start] * r.B_zero_point[quant_param_idx];
} else {
assert(
Q_GRAN == QuantizationGranularity::OUT_CHANNEL &&
"unknown quantization granularity");
}
__m256i row_offset_v = _mm256_set1_epi32(row_offset);
int j = block.col_start;
for (; j < block.col_start + (block.col_size / (VLEN * 4) * (VLEN * 4));
j += (VLEN * 4)) {
__m256i x_v = _mm256_loadu_si256(reinterpret_cast<const __m256i*>(
inp + (i - block.row_start) * ld_in + (j - block.col_start)));
__m256i y_v = _mm256_loadu_si256(reinterpret_cast<const __m256i*>(
inp + (i - block.row_start) * ld_in + (j - block.col_start) +
1 * VLEN));
__m256i z_v = _mm256_loadu_si256(reinterpret_cast<const __m256i*>(
inp + (i - block.row_start) * ld_in + (j - block.col_start) +
2 * VLEN));
__m256i w_v = _mm256_loadu_si256(reinterpret_cast<const __m256i*>(
inp + (i - block.row_start) * ld_in + (j - block.col_start) +
3 * VLEN));
if (!A_SYMMETRIC) {
__m256i col_off_v = _mm256_mullo_epi32(
A_zero_point_v,
_mm256_loadu_si256(
reinterpret_cast<const __m256i*>(r.col_offsets + j)));
x_v = _mm256_sub_epi32(x_v, col_off_v);
col_off_v = _mm256_mullo_epi32(
A_zero_point_v,
_mm256_loadu_si256(
reinterpret_cast<const __m256i*>(r.col_offsets + j + VLEN)));
y_v = _mm256_sub_epi32(y_v, col_off_v);
col_off_v = _mm256_mullo_epi32(
A_zero_point_v,
_mm256_loadu_si256(reinterpret_cast<const __m256i*>(
r.col_offsets + j + 2 * VLEN)));
z_v = _mm256_sub_epi32(z_v, col_off_v);
col_off_v = _mm256_mullo_epi32(
A_zero_point_v,
_mm256_loadu_si256(reinterpret_cast<const __m256i*>(
r.col_offsets + j + 3 * VLEN)));
w_v = _mm256_sub_epi32(w_v, col_off_v);
}
if (!B_SYMMETRIC) {
if (Q_GRAN == QuantizationGranularity::OUT_CHANNEL) {
row_offset_v = _mm256_mullo_epi32(
_mm256_set1_epi32(r.row_offsets[i - block.row_start]),
_mm256_loadu_si256(
reinterpret_cast<const __m256i*>(r.B_zero_point + j)));
}
x_v = _mm256_sub_epi32(x_v, row_offset_v);
if (Q_GRAN == QuantizationGranularity::OUT_CHANNEL) {
row_offset_v = _mm256_mullo_epi32(
_mm256_set1_epi32(r.row_offsets[i - block.row_start]),
_mm256_loadu_si256(
reinterpret_cast<const __m256i*>(r.B_zero_point + j + VLEN)));
}
y_v = _mm256_sub_epi32(y_v, row_offset_v);
if (Q_GRAN == QuantizationGranularity::OUT_CHANNEL) {
row_offset_v = _mm256_mullo_epi32(
_mm256_set1_epi32(r.row_offsets[i - block.row_start]),
_mm256_loadu_si256(reinterpret_cast<const __m256i*>(
r.B_zero_point + j + 2 * VLEN)));
}
z_v = _mm256_sub_epi32(z_v, row_offset_v);
if (Q_GRAN == QuantizationGranularity::OUT_CHANNEL) {
row_offset_v = _mm256_mullo_epi32(
_mm256_set1_epi32(r.row_offsets[i - block.row_start]),
_mm256_loadu_si256(reinterpret_cast<const __m256i*>(
r.B_zero_point + j + 3 * VLEN)));
}
w_v = _mm256_sub_epi32(w_v, row_offset_v);
}
__m256 xf_v, yf_v, zf_v, wf_v;
if (HAS_BIAS) {
if (is_same<BIAS_TYPE, float>::value) {
__m256 x_bias_v, y_bias_v, z_bias_v, w_bias_v;
if (Q_GRAN == QuantizationGranularity::OUT_CHANNEL) {
x_bias_v = _mm256_div_ps(
_mm256_loadu_ps(
reinterpret_cast<const float*>(r.bias + j + 0 * VLEN)),
_mm256_loadu_ps(r.act_times_w_scale + j + 0 * VLEN));
y_bias_v = _mm256_div_ps(
_mm256_loadu_ps(
reinterpret_cast<const float*>(r.bias + j + 1 * VLEN)),
_mm256_loadu_ps(r.act_times_w_scale + j + 1 * VLEN));
z_bias_v = _mm256_div_ps(
_mm256_loadu_ps(
reinterpret_cast<const float*>(r.bias + j + 2 * VLEN)),
_mm256_loadu_ps(r.act_times_w_scale + j + 2 * VLEN));
w_bias_v = _mm256_div_ps(
_mm256_loadu_ps(
reinterpret_cast<const float*>(r.bias + j + 3 * VLEN)),
_mm256_loadu_ps(r.act_times_w_scale + j + 3 * VLEN));
} else {
x_bias_v = _mm256_mul_ps(
_mm256_loadu_ps(
reinterpret_cast<const float*>(r.bias + j + 0 * VLEN)),
act_times_w_rcp_v);
y_bias_v = _mm256_mul_ps(
_mm256_loadu_ps(
reinterpret_cast<const float*>(r.bias + j + 1 * VLEN)),
act_times_w_rcp_v);
z_bias_v = _mm256_mul_ps(
_mm256_loadu_ps(
reinterpret_cast<const float*>(r.bias + j + 2 * VLEN)),
act_times_w_rcp_v);
w_bias_v = _mm256_mul_ps(
_mm256_loadu_ps(
reinterpret_cast<const float*>(r.bias + j + 3 * VLEN)),
act_times_w_rcp_v);
}
xf_v = _mm256_add_ps(_mm256_cvtepi32_ps(x_v), x_bias_v);
yf_v = _mm256_add_ps(_mm256_cvtepi32_ps(y_v), y_bias_v);
zf_v = _mm256_add_ps(_mm256_cvtepi32_ps(z_v), z_bias_v);
wf_v = _mm256_add_ps(_mm256_cvtepi32_ps(w_v), w_bias_v);
} else {
x_v = _mm256_add_epi32(
x_v,
_mm256_loadu_si256(
reinterpret_cast<const __m256i*>(r.bias + j + 0 * VLEN)));
y_v = _mm256_add_epi32(
y_v,
_mm256_loadu_si256(
reinterpret_cast<const __m256i*>(r.bias + j + 1 * VLEN)));
z_v = _mm256_add_epi32(
z_v,
_mm256_loadu_si256(
reinterpret_cast<const __m256i*>(r.bias + j + 2 * VLEN)));
w_v = _mm256_add_epi32(
w_v,
_mm256_loadu_si256(
reinterpret_cast<const __m256i*>(r.bias + j + 3 * VLEN)));
xf_v = _mm256_cvtepi32_ps(x_v);
yf_v = _mm256_cvtepi32_ps(y_v);
zf_v = _mm256_cvtepi32_ps(z_v);
wf_v = _mm256_cvtepi32_ps(w_v);
}
} else {
xf_v = _mm256_cvtepi32_ps(x_v);
yf_v = _mm256_cvtepi32_ps(y_v);
zf_v = _mm256_cvtepi32_ps(z_v);
wf_v = _mm256_cvtepi32_ps(w_v);
}
/*
* Convert int32_t input to FP32 and multiply by FP32 scale.
* Both operations involve statistically unbiased roundings (with
* default MXCSR rounding mode):
* - Large int32_t values can't be exactly represented as FP32.
* CVTDQ2PS instruction on x86 would round it according to nearest
* FP32 value with ties to even (assuming default MXCSR rounding
* mode).
* - Product of two FP32 values is generally not exactly
* representation as an FP32 value, and will be rounded to nearest
* FP32 value with ties to even with default MXCSR rounding mode.
*/
__m256 x_scaled_v, y_scaled_v, z_scaled_v, w_scaled_v;
if (Q_GRAN == QuantizationGranularity::OUT_CHANNEL) {
x_scaled_v =
_mm256_mul_ps(xf_v, _mm256_loadu_ps(r.C_multiplier + j + 0 * VLEN));
y_scaled_v =
_mm256_mul_ps(yf_v, _mm256_loadu_ps(r.C_multiplier + j + 1 * VLEN));
z_scaled_v =
_mm256_mul_ps(zf_v, _mm256_loadu_ps(r.C_multiplier + j + 2 * VLEN));
w_scaled_v =
_mm256_mul_ps(wf_v, _mm256_loadu_ps(r.C_multiplier + j + 3 * VLEN));
} else {
x_scaled_v = _mm256_mul_ps(xf_v, multiplier_v);
y_scaled_v = _mm256_mul_ps(yf_v, multiplier_v);
z_scaled_v = _mm256_mul_ps(zf_v, multiplier_v);
w_scaled_v = _mm256_mul_ps(wf_v, multiplier_v);
}
/*
* Convert scaled FP32 result to int32_t using CVTPS2DQ instruction.
* CVTPS2DQ instruction rounds result according to nearest FP32 value
* with ties to even (assuming default MXCSR rounding mode). However,
* when conversion overflows, it produces INT32_MIN as a result. For
* large positive inputs the result of conversion can become negative,
* which affects the final requantization result. Note that on x86
* SSE2 we have e.g. int32_t(float(INT32_MAX)) == INT32_MIN! This
* happens because float(INT32_MAX) rounds to 2**31, which overflows
* int32_t when it is converted back to integer.
*
* Thankfully, we can prove that overflow never happens in this
* requantization scheme. The largest positive input is INT32_MAX
* (2**31 - 1), which turns into 2**31 when converted to float. The
* largest scale value is 0x1.FFFFFEp-1. When multiplied together, the
* result is 2147483520 (compare to INT32_MAX = 2147483647), which
* fits into int32_t without overflow.
*/
__m256i x_rounded_v = _mm256_cvtps_epi32(x_scaled_v);
__m256i y_rounded_v = _mm256_cvtps_epi32(y_scaled_v);
__m256i z_rounded_v = _mm256_cvtps_epi32(z_scaled_v);
__m256i w_rounded_v = _mm256_cvtps_epi32(w_scaled_v);
/*
* Standard final sequence on x86 AVX2:
* - Pack to int16_t and saturate
* - Add zero point
* - Pack to uint8_t and saturate
* - Clamp between qmin and qmax
*/
__m256i xy_packed_v = _mm256_adds_epi16(
_mm256_packs_epi32(x_rounded_v, y_rounded_v), C_zero_point_epi16_v);
__m256i zw_packed_v = _mm256_adds_epi16(
_mm256_packs_epi32(z_rounded_v, w_rounded_v), C_zero_point_epi16_v);
__m256i xyzw_packed_v = _mm256_packus_epi16(xy_packed_v, zw_packed_v);
__m256i xyzw_clamped_v = _mm256_max_epu8(
FUSE_RELU ? C_zero_point_epi8_v : min_v,
_mm256_min_epu8(xyzw_packed_v, max_v));
/*
* xyzw_clamped_v has results in the following layout so we need to
* permute: x0-3 y0-3 z0-3 w0-3 x4-7 y4-7 z4-7 w4-7
*/
xyzw_clamped_v =
_mm256_permutevar8x32_epi32(xyzw_clamped_v, permute_mask_v);
/*
* 4x CVTDQ2PS
* 4x MULPS
* 4x CVTPS2DQ
* 2x PACKSSDW
* 1x PACKUSWB
* 2x PADDW
* 1x PMAXUB
* 1x PMINUB
* 1x PERMD
* ---------------------
* 20 instructions total
*/
_mm256_storeu_si256(
reinterpret_cast<__m256i*>(out + i * ld_out + j), xyzw_clamped_v);
} // j loop vectorized and unrolled 4x
for (; j < block.col_start + (block.col_size / VLEN * VLEN); j += VLEN) {
__m256i x_v = _mm256_loadu_si256(reinterpret_cast<const __m256i*>(
inp + (i - block.row_start) * ld_in + (j - block.col_start)));
if (!A_SYMMETRIC) {
__m256i col_off_v = _mm256_mullo_epi32(
A_zero_point_v,
_mm256_loadu_si256(
reinterpret_cast<const __m256i*>(r.col_offsets + j)));
x_v = _mm256_sub_epi32(x_v, col_off_v);
}
if (!B_SYMMETRIC) {
if (Q_GRAN == QuantizationGranularity::OUT_CHANNEL) {
row_offset_v = _mm256_mullo_epi32(
_mm256_set1_epi32(r.row_offsets[i - block.row_start]),
_mm256_loadu_si256(
reinterpret_cast<const __m256i*>(r.B_zero_point + j)));
}
x_v = _mm256_sub_epi32(x_v, row_offset_v);
}
__m256 xf_v;
if (HAS_BIAS) {
if (is_same<BIAS_TYPE, float>::value) {
__m256 x_bias_v;
if (Q_GRAN == QuantizationGranularity::OUT_CHANNEL) {
x_bias_v = _mm256_div_ps(
_mm256_loadu_ps(reinterpret_cast<const float*>(r.bias + j)),
_mm256_loadu_ps(r.act_times_w_scale + j));
} else {
x_bias_v = _mm256_mul_ps(
_mm256_loadu_ps(reinterpret_cast<const float*>(r.bias + j)),
act_times_w_rcp_v);
}
xf_v = _mm256_add_ps(_mm256_cvtepi32_ps(x_v), x_bias_v);
} else {
x_v = _mm256_add_epi32(
x_v,
_mm256_loadu_si256(reinterpret_cast<const __m256i*>(r.bias + j)));
xf_v = _mm256_cvtepi32_ps(x_v);
}
} else {
xf_v = _mm256_cvtepi32_ps(x_v);
}
__m256 x_scaled_v;
if (Q_GRAN == QuantizationGranularity::OUT_CHANNEL) {
x_scaled_v = _mm256_mul_ps(xf_v, _mm256_loadu_ps(r.C_multiplier + j));
} else {
x_scaled_v = _mm256_mul_ps(xf_v, multiplier_v);
}
__m256i x_rounded_v = _mm256_cvtps_epi32(x_scaled_v);
__m256i x_packed_v = _mm256_adds_epi16(
_mm256_packs_epi32(x_rounded_v, _mm256_setzero_si256()),
C_zero_point_epi16_v);
x_packed_v = _mm256_packus_epi16(x_packed_v, _mm256_setzero_si256());
__m256i x_clamped_v = _mm256_max_epu8(
FUSE_RELU ? C_zero_point_epi8_v : min_v,
_mm256_min_epu8(x_packed_v, max_v));
/*
* x_clamped_v has results in the following layout so we need to
* permute: x0-3 garbage0-11 x4-7 garbage12-23
*/
x_clamped_v = _mm256_permutevar8x32_epi32(x_clamped_v, permute_mask_v);
/*
* 1x CVTDQ2PS
* 1x MULPS
* 1x CVTPS2DQ
* 1x PACKSSDW
* 1x PACKUSWB
* 1x PADDW
* 1x PMAXUB
* 1x PMINUB
* 1x PERMD
* ---------------------
* 9 instructions total
*/
_mm_storel_epi64(
reinterpret_cast<__m128i*>(out + i * ld_out + j),
_mm256_castsi256_si128(x_clamped_v));
} // j loop vectorized
int remainder = block.col_start + block.col_size - j;
if (remainder > 0) {
__m256i mask_v = _mm256_load_si256(reinterpret_cast<const __m256i*>(
internal::avx2_ps_or_epi32_masks[remainder]));
__m256i x_v = _mm256_maskload_epi32(
inp + (i - block.row_start) * ld_in + (j - block.col_start), mask_v);
if (!A_SYMMETRIC) {
__m256i col_off_v = _mm256_mullo_epi32(
A_zero_point_v, _mm256_maskload_epi32(r.col_offsets + j, mask_v));
x_v = _mm256_sub_epi32(x_v, col_off_v);
}
if (!B_SYMMETRIC) {
if (Q_GRAN == QuantizationGranularity::OUT_CHANNEL) {
row_offset_v = _mm256_mullo_epi32(
_mm256_set1_epi32(r.row_offsets[i - block.row_start]),
_mm256_maskload_epi32(r.B_zero_point + j, mask_v));
}
x_v = _mm256_sub_epi32(x_v, row_offset_v);
}
__m256 xf_v;
if (HAS_BIAS) {
if (is_same<BIAS_TYPE, float>::value) {
__m256 x_bias_v;
if (Q_GRAN == QuantizationGranularity::OUT_CHANNEL) {
x_bias_v = _mm256_div_ps(
_mm256_maskload_ps(
reinterpret_cast<const float*>(r.bias + j), mask_v),
_mm256_maskload_ps(r.act_times_w_scale + j, mask_v));
} else {
x_bias_v = _mm256_mul_ps(
_mm256_maskload_ps(
reinterpret_cast<const float*>(r.bias + j), mask_v),
act_times_w_rcp_v);
}
xf_v = _mm256_add_ps(_mm256_cvtepi32_ps(x_v), x_bias_v);
} else {
x_v = _mm256_add_epi32(
x_v,
_mm256_maskload_epi32(
reinterpret_cast<const int*>(r.bias + j), mask_v));
xf_v = _mm256_cvtepi32_ps(x_v);
}
} else {
xf_v = _mm256_cvtepi32_ps(x_v);
}
__m256 x_scaled_v;
if (Q_GRAN == QuantizationGranularity::OUT_CHANNEL) {
x_scaled_v =
_mm256_mul_ps(xf_v, _mm256_maskload_ps(r.C_multiplier + j, mask_v));
} else {
x_scaled_v = _mm256_mul_ps(xf_v, multiplier_v);
}
__m256i x_rounded_v = _mm256_cvtps_epi32(x_scaled_v);
__m256i x_packed_v = _mm256_adds_epi16(
_mm256_packs_epi32(x_rounded_v, _mm256_setzero_si256()),
C_zero_point_epi16_v);
x_packed_v = _mm256_packus_epi16(x_packed_v, _mm256_setzero_si256());
__m256i x_clamped_v = _mm256_max_epu8(
FUSE_RELU ? C_zero_point_epi8_v : min_v,
_mm256_min_epu8(x_packed_v, max_v));
/*
* x_clamped_v has results in the following layout so we need to
* permute: x0-3 garbage0-11 x4-7 garbage12-23
*/
x_clamped_v = _mm256_permutevar8x32_epi32(x_clamped_v, permute_mask_v);
/*
* 1x CVTDQ2PS
* 1x MULPS
* 1x CVTPS2DQ
* 1x PACKSSDW
* 1x PACKUSWB
* 1x PADDW
* 1x PMAXUB
* 1x PMINUB
* 1x PERMD
* ---------------------
* 9 instructions total
*/
alignas(64) uint8_t x_clamped_buffer[32];
_mm256_store_si256(
reinterpret_cast<__m256i*>(x_clamped_buffer), x_clamped_v);
for (int k = 0; k < remainder; ++k) {
out[i * ld_out + j + k] = x_clamped_buffer[k];
}
} // j loop remainder
} // i loop
}
template <
bool A_SYMMETRIC,
bool B_SYMMETRIC,
QuantizationGranularity Q_GRAN,
bool HAS_BIAS,
bool FUSE_RELU>
void requantizeForFloatAvx2(
float* out,
const int32_t* inp,
const block_type_t& block,
int ld_out,
int ld_in,
const requantizationForFloatParams_t& r) {
// Adoption of implementation at QNNPACK/src/requantization/fp32-sse2.c
// using AVX2 instructions
int quant_param_idx = 0;
if (Q_GRAN == QuantizationGranularity::GROUP) {
int ncol_per_group = r.ncols / r.groups;
int g = block.col_start / ncol_per_group;
quant_param_idx = g;
}
__m256 multiplier_v = _mm256_set1_ps(r.A_scale * r.B_scale[quant_param_idx]);
assert(
(A_SYMMETRIC == (r.A_zero_point == 0)) &&
"A_SYMMETRIC == true if and only if A_zero_point == 0");
assert(
(B_SYMMETRIC ==
((Q_GRAN == QuantizationGranularity::TENSOR && r.B_zero_point[0] == 0) ||
r.row_offsets == nullptr)) &&
"B_SYMMETRIC == true if and only if B_zero_point == 0 "
"or r.row_offsets == nullptr");
assert(
(HAS_BIAS == (r.bias != nullptr)) &&
"HAS_BIAS == true if and only if bias != nullptr");
__m256i A_zero_point_v = _mm256_set1_epi32(r.A_zero_point);
constexpr int VLEN = 8;
for (int i = block.row_start; i < block.row_start + block.row_size; ++i) {
// Scale row_offset with Bq_zero_point
int32_t row_offset = 0;
if (B_SYMMETRIC) {
row_offset = 0;
} else if (
Q_GRAN == QuantizationGranularity::TENSOR ||
Q_GRAN == QuantizationGranularity::GROUP) {
row_offset =
r.row_offsets[i - block.row_start] * r.B_zero_point[quant_param_idx];
} else {
assert(
Q_GRAN == QuantizationGranularity::OUT_CHANNEL &&
"unknown quantization granularity");
}
__m256i row_offset_v = _mm256_set1_epi32(row_offset);
int j = block.col_start;
for (; j < block.col_start + (block.col_size / VLEN * VLEN); j += VLEN) {
__m256i x_v = _mm256_loadu_si256(reinterpret_cast<const __m256i*>(
inp + (i - block.row_start) * ld_in + (j - block.col_start)));
if (!A_SYMMETRIC) {
__m256i col_off_v = _mm256_mullo_epi32(
A_zero_point_v,
_mm256_loadu_si256(
reinterpret_cast<const __m256i*>(r.col_offsets + j)));
x_v = _mm256_sub_epi32(x_v, col_off_v);
}
if (!B_SYMMETRIC) {
if (Q_GRAN == QuantizationGranularity::OUT_CHANNEL) {
row_offset_v = _mm256_mullo_epi32(
_mm256_set1_epi32(r.row_offsets[i - block.row_start]),
_mm256_loadu_si256(
reinterpret_cast<const __m256i*>(r.B_zero_point + j)));
}
x_v = _mm256_sub_epi32(x_v, row_offset_v);
}
__m256 x_scaled_v;
if (Q_GRAN == QuantizationGranularity::OUT_CHANNEL) {
x_scaled_v = _mm256_mul_ps(
_mm256_cvtepi32_ps(x_v),
_mm256_mul_ps(
_mm256_set1_ps(r.A_scale), _mm256_loadu_ps(r.B_scale + j)));
} else {
x_scaled_v = _mm256_mul_ps(_mm256_cvtepi32_ps(x_v), multiplier_v);
}
if (HAS_BIAS) {
x_scaled_v = _mm256_add_ps(x_scaled_v, _mm256_loadu_ps(r.bias + j));
}
if (FUSE_RELU) {
x_scaled_v = _mm256_max_ps(_mm256_setzero_ps(), x_scaled_v);
}
_mm256_storeu_ps(out + i * ld_out + j, x_scaled_v);
} // j loop vectorized
int remainder = block.col_start + block.col_size - j;
if (remainder > 0) {
__m256i mask_v = _mm256_load_si256(reinterpret_cast<const __m256i*>(
internal::avx2_ps_or_epi32_masks[remainder]));
__m256i x_v = _mm256_maskload_epi32(
inp + (i - block.row_start) * ld_in + (j - block.col_start), mask_v);
if (!A_SYMMETRIC) {
__m256i col_off_v = _mm256_mullo_epi32(
A_zero_point_v, _mm256_maskload_epi32(r.col_offsets + j, mask_v));