219 lines
6.0 KiB
C++
219 lines
6.0 KiB
C++
//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// fixedpoint_avx.h: optimized avx specializations of the templates
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// in fixedpoint.h.
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#ifndef GEMMLOWP_INTERNAL_FIXEDPOINT_AVX_H_
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#define GEMMLOWP_INTERNAL_FIXEDPOINT_AVX_H_
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#include <smmintrin.h>
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#include "fixedpoint.h"
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#include "fixedpoint_sse.h"
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namespace gemmlowp {
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template <>
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struct FixedPointRawTypeTraits<__m256i> {
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typedef std::int32_t ScalarRawType;
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static const int kLanes = 4;
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};
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template <>
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inline __m256i BitAnd(__m256i a, __m256i b) {
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return _mm256_and_si256(a, b);
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}
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template <>
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inline __m256i BitOr(__m256i a, __m256i b) {
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return _mm256_or_si256(a, b);
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}
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template <>
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inline __m256i BitXor(__m256i a, __m256i b) {
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return _mm256_xor_si256(a, b);
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}
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template <>
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inline __m256i BitNot(__m256i a) {
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return _mm256_andnot_si256(a, _mm256_set1_epi32(-1));
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}
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template <>
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inline __m256i Add(__m256i a, __m256i b) {
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return _mm256_add_epi32(a, b);
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}
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template <>
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inline __m256i Mul(__m256i a, __m256i b) {
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return _mm256_mullo_epi32(a, b);
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}
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template <>
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inline __m256i Sub(__m256i a, __m256i b) {
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return _mm256_sub_epi32(a, b);
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}
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template <>
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inline __m256i Neg(__m256i a) {
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return _mm256_sign_epi32(a, _mm256_set1_epi32(-1));
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}
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template <>
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inline __m256i ShiftLeft(__m256i a, int offset) {
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return _mm256_slli_epi32(a, offset);
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}
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template <>
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inline __m256i ShiftRight(__m256i a, int offset) {
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return _mm256_srai_epi32(a, offset);
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}
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template <>
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inline __m256i SelectUsingMask(__m256i if_mask, __m256i then_val,
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__m256i else_val) {
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return _mm256_castps_si256(_mm256_blendv_ps(_mm256_castsi256_ps(else_val),
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_mm256_castsi256_ps(then_val),
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_mm256_castsi256_ps(if_mask)));
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}
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template <>
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inline __m256i MaskIfEqual(__m256i a, __m256i b) {
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return _mm256_cmpeq_epi32(a, b);
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}
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template <>
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inline __m256i MaskIfNotEqual(__m256i a, __m256i b) {
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return BitNot(MaskIfEqual(a, b));
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}
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template <>
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inline __m256i MaskIfZero(__m256i a) {
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return MaskIfEqual(a, _mm256_set1_epi32(0));
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}
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template <>
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inline __m256i MaskIfNonZero(__m256i a) {
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return MaskIfNotEqual(a, _mm256_set1_epi32(0));
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}
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template <>
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inline __m256i MaskIfGreaterThan(__m256i a, __m256i b) {
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return _mm256_cmpgt_epi32(a, b);
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}
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template <>
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inline __m256i MaskIfLessThan(__m256i a, __m256i b) {
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return _mm256_cmpgt_epi32(b, a);
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}
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template <>
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inline __m256i MaskIfGreaterThanOrEqual(__m256i a, __m256i b) {
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return BitNot(MaskIfLessThan(a, b));
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}
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template <>
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inline __m256i MaskIfLessThanOrEqual(__m256i a, __m256i b) {
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return BitNot(MaskIfGreaterThan(a, b));
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}
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/* Assumptions:
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- All and Any are used on masks.
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- masks are all_ones for true lanes, all_zeroes otherwise.
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Hence, All means all 128bits set, and Any means any bit set.
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*/
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template <>
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inline bool All(__m256i a) {
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return _mm256_testc_si256(a, a);
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}
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template <>
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inline bool Any(__m256i a) {
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return BitNot(_mm256_testz_si256(a, a));
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}
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template <>
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inline __m256i RoundingHalfSum(__m256i a, __m256i b) {
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/* __m256i round_bit_mask, a_over_2, b_over_2, round_bit, sum; */
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/* We divide the inputs before the add to avoid the overflow and costly test
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*/
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/* of checking if an overflow occured on signed add */
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/* round_bit_mask = _mm_set1_epi32(1); */
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/* a_over_2 = _mm_srai_epi32(a, 1); */
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/* b_over_2 = _mm_srai_epi32(b, 1); */
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/* sum = Add(a_over_2, b_over_2); */
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/* round_bit = _mm_sign_epi32(BitAnd(BitOr(a,b), round_bit_mask), sum); */
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/* return Add(sum, round_bit); */
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/* Other possibility detecting overflow and xor the sign if an overflow
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* happened*/
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__m256i one, sign_bit_mask, sum, rounded_half_sum, overflow, result;
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one = _mm256_set1_epi32(1);
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sign_bit_mask = _mm256_set1_epi32(0x80000000);
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sum = Add(a, b);
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rounded_half_sum = _mm256_srai_epi32(Add(sum, one), 1);
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overflow =
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BitAnd(BitAnd(BitXor(a, rounded_half_sum), BitXor(b, rounded_half_sum)),
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sign_bit_mask);
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result = BitXor(rounded_half_sum, overflow);
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return result;
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}
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template <>
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inline __m256i SaturatingRoundingDoublingHighMul(__m256i a, __m256i b) {
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__m256i min, saturation_mask, a0_a2, a1_a3, b0_b2, b1_b3;
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__m256i a0b0_a2b2, a1b1_a3b3, a0b0_a2b2_rounded, a1b1_a3b3_rounded;
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__m256i a0b0_a2b2_rounded_2x, a1b1_a3b3_rounded_2x, result;
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__m256i nudge;
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// saturation only happen if a == b == INT_MIN
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min = _mm256_set1_epi32(std::numeric_limits<std::int32_t>::min());
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saturation_mask = BitAnd(MaskIfEqual(a, b), MaskIfEqual(a, min));
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// a = a0 | a1 | a2 | a3
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// b = b0 | b1 | b2 | b3
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a0_a2 = a;
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a1_a3 = _mm256_srli_si256(a, 4);
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b0_b2 = b;
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b1_b3 = _mm256_srli_si256(b, 4);
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a0b0_a2b2 = _mm256_mul_epi32(a0_a2, b0_b2);
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a1b1_a3b3 = _mm256_mul_epi32(a1_a3, b1_b3);
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// do the rounding and take into account that it will be doubled
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nudge = _mm256_set1_epi64x(1 << 30);
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a0b0_a2b2_rounded = _mm256_add_epi64(a0b0_a2b2, nudge);
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a1b1_a3b3_rounded = _mm256_add_epi64(a1b1_a3b3, nudge);
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// do the doubling
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a0b0_a2b2_rounded_2x = _mm256_slli_epi64(a0b0_a2b2_rounded, 1);
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a1b1_a3b3_rounded_2x = _mm256_slli_epi64(a1b1_a3b3_rounded, 1);
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// get the high part of the products
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result = _mm256_blend_epi16(_mm256_srli_si256(a0b0_a2b2_rounded_2x, 4),
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a1b1_a3b3_rounded_2x, 0xcc);
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// saturate those which overflowed
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return SelectUsingMask(saturation_mask, min, result);
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}
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template <>
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inline __m256i Dup<__m256i>(std::int32_t x) {
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return _mm256_set1_epi32(x);
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}
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} // end namespace gemmlowp
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#endif // GEMMLOWP_INTERNAL_FIXEDPOINT_AVX_H_
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