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#include "dot_product_sse.h"
#include <library/cpp/sse/sse.h>
#include <util/system/platform.h>
#include <util/system/compiler.h>
#ifdef ARCADIA_SSE
i32 DotProductSse(const i8* lhs, const i8* rhs, size_t length) noexcept {
const __m128i zero = _mm_setzero_si128();
__m128i resVec = zero;
while (length >= 16) {
__m128i lVec = _mm_loadu_si128((const __m128i*)lhs);
__m128i rVec = _mm_loadu_si128((const __m128i*)rhs);
#ifdef _sse4_1_
__m128i lLo = _mm_cvtepi8_epi16(lVec);
__m128i rLo = _mm_cvtepi8_epi16(rVec);
__m128i lHi = _mm_cvtepi8_epi16(_mm_alignr_epi8(lVec, lVec, 8));
__m128i rHi = _mm_cvtepi8_epi16(_mm_alignr_epi8(rVec, rVec, 8));
#else
__m128i lLo = _mm_srai_epi16(_mm_unpacklo_epi8(zero, lVec), 8);
__m128i rLo = _mm_srai_epi16(_mm_unpacklo_epi8(zero, rVec), 8);
__m128i lHi = _mm_srai_epi16(_mm_unpackhi_epi8(zero, lVec), 8);
__m128i rHi = _mm_srai_epi16(_mm_unpackhi_epi8(zero, rVec), 8);
#endif
resVec = _mm_add_epi32(resVec,
_mm_add_epi32(_mm_madd_epi16(lLo, rLo), _mm_madd_epi16(lHi, rHi)));
lhs += 16;
rhs += 16;
length -= 16;
}
alignas(16) i32 res[4];
_mm_store_si128((__m128i*)res, resVec);
i32 sum = res[0] + res[1] + res[2] + res[3];
for (size_t i = 0; i < length; ++i) {
sum += static_cast<i32>(lhs[i]) * static_cast<i32>(rhs[i]);
}
return sum;
}
ui32 DotProductSse(const ui8* lhs, const ui8* rhs, size_t length) noexcept {
const __m128i zero = _mm_setzero_si128();
__m128i resVec = zero;
while (length >= 16) {
__m128i lVec = _mm_loadu_si128((const __m128i*)lhs);
__m128i rVec = _mm_loadu_si128((const __m128i*)rhs);
__m128i lLo = _mm_unpacklo_epi8(lVec, zero);
__m128i rLo = _mm_unpacklo_epi8(rVec, zero);
__m128i lHi = _mm_unpackhi_epi8(lVec, zero);
__m128i rHi = _mm_unpackhi_epi8(rVec, zero);
resVec = _mm_add_epi32(resVec,
_mm_add_epi32(_mm_madd_epi16(lLo, rLo), _mm_madd_epi16(lHi, rHi)));
lhs += 16;
rhs += 16;
length -= 16;
}
alignas(16) i32 res[4];
_mm_store_si128((__m128i*)res, resVec);
i32 sum = res[0] + res[1] + res[2] + res[3];
for (size_t i = 0; i < length; ++i) {
sum += static_cast<i32>(lhs[i]) * static_cast<i32>(rhs[i]);
}
return static_cast<ui32>(sum);
}
#ifdef _sse4_1_
i64 DotProductSse(const i32* lhs, const i32* rhs, size_t length) noexcept {
__m128i zero = _mm_setzero_si128();
__m128i res = zero;
while (length >= 4) {
__m128i a = _mm_loadu_si128((const __m128i*)lhs);
__m128i b = _mm_loadu_si128((const __m128i*)rhs);
res = _mm_add_epi64(_mm_mul_epi32(a, b), res); // This is lower parts multiplication
a = _mm_alignr_epi8(a, a, 4);
b = _mm_alignr_epi8(b, b, 4);
res = _mm_add_epi64(_mm_mul_epi32(a, b), res);
rhs += 4;
lhs += 4;
length -= 4;
}
alignas(16) i64 r[2];
_mm_store_si128((__m128i*)r, res);
i64 sum = r[0] + r[1];
for (size_t i = 0; i < length; ++i) {
sum += static_cast<i64>(lhs[i]) * static_cast<i64>(rhs[i]);
}
return sum;
}
#else
#include "dot_product_simple.h"
i64 DotProductSse(const i32* lhs, const i32* rhs, size_t length) noexcept {
return DotProductSimple(lhs, rhs, length);
}
#endif
float DotProductSse(const float* lhs, const float* rhs, size_t length) noexcept {
__m128 sum1 = _mm_setzero_ps();
__m128 sum2 = _mm_setzero_ps();
__m128 a1, b1, a2, b2, m1, m2;
while (length >= 8) {
a1 = _mm_loadu_ps(lhs);
b1 = _mm_loadu_ps(rhs);
m1 = _mm_mul_ps(a1, b1);
a2 = _mm_loadu_ps(lhs + 4);
sum1 = _mm_add_ps(sum1, m1);
b2 = _mm_loadu_ps(rhs + 4);
m2 = _mm_mul_ps(a2, b2);
sum2 = _mm_add_ps(sum2, m2);
length -= 8;
lhs += 8;
rhs += 8;
}
if (length >= 4) {
a1 = _mm_loadu_ps(lhs);
b1 = _mm_loadu_ps(rhs);
sum1 = _mm_add_ps(sum1, _mm_mul_ps(a1, b1));
length -= 4;
lhs += 4;
rhs += 4;
}
sum1 = _mm_add_ps(sum1, sum2);
if (length) {
switch (length) {
case 3:
a1 = _mm_set_ps(0.0f, lhs[2], lhs[1], lhs[0]);
b1 = _mm_set_ps(0.0f, rhs[2], rhs[1], rhs[0]);
break;
case 2:
a1 = _mm_set_ps(0.0f, 0.0f, lhs[1], lhs[0]);
b1 = _mm_set_ps(0.0f, 0.0f, rhs[1], rhs[0]);
break;
case 1:
a1 = _mm_set_ps(0.0f, 0.0f, 0.0f, lhs[0]);
b1 = _mm_set_ps(0.0f, 0.0f, 0.0f, rhs[0]);
break;
default:
Y_UNREACHABLE();
}
sum1 = _mm_add_ps(sum1, _mm_mul_ps(a1, b1));
}
alignas(16) float res[4];
_mm_store_ps(res, sum1);
return res[0] + res[1] + res[2] + res[3];
}
double DotProductSse(const double* lhs, const double* rhs, size_t length) noexcept {
__m128d sum1 = _mm_setzero_pd();
__m128d sum2 = _mm_setzero_pd();
__m128d a1, b1, a2, b2;
while (length >= 4) {
a1 = _mm_loadu_pd(lhs);
b1 = _mm_loadu_pd(rhs);
sum1 = _mm_add_pd(sum1, _mm_mul_pd(a1, b1));
a2 = _mm_loadu_pd(lhs + 2);
b2 = _mm_loadu_pd(rhs + 2);
sum2 = _mm_add_pd(sum2, _mm_mul_pd(a2, b2));
length -= 4;
lhs += 4;
rhs += 4;
}
if (length >= 2) {
a1 = _mm_loadu_pd(lhs);
b1 = _mm_loadu_pd(rhs);
sum1 = _mm_add_pd(sum1, _mm_mul_pd(a1, b1));
length -= 2;
lhs += 2;
rhs += 2;
}
sum1 = _mm_add_pd(sum1, sum2);
if (length > 0) {
a1 = _mm_set_pd(lhs[0], 0.0);
b1 = _mm_set_pd(rhs[0], 0.0);
sum1 = _mm_add_pd(sum1, _mm_mul_pd(a1, b1));
}
alignas(16) double res[2];
_mm_store_pd(res, sum1);
return res[0] + res[1];
}
#endif // ARCADIA_SSE
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