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在math_functions 的 添加使用arm neon写的simd_dot函数 #82

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在math_functions 的 添加使用arm neon写的simd_dot函数 #82

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44 changes: 37 additions & 7 deletions FaceIdentification/src/math_functions.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -30,26 +30,35 @@
*/

#include "math_functions.h"
#include <xmmintrin.h>
#include <cstdint>

#ifdef _WIN32
#include <intrin.h>
#else
#include <x86intrin.h>
#if defined(_MSC_VER)
/* Microsoft C/C++-compatible compiler */
#include <intrin.h>
#elif defined(__GNUC__) && (defined(__x86_64__) || defined(__i386__))
/* GCC-compatible compiler, targeting x86/x86-64 */
#include <x86intrin.h>
#elif defined(__GNUC__) && defined(__ARM_NEON__)
/* GCC-compatible compiler, targeting ARM with NEON */
#include <arm_neon.h>
#endif



#if defined(__GNUC__) && (defined(__x86_64__) || defined(__i386__) || defined(_MSC_VER) )
float simd_dot(const float* x, const float* y, const long& len) {
#pragma message("USE SSE")
float inner_prod = 0.0f;
__m128 X, Y; // 128-bit values
__m128 X,Y,Z; // 128-bit values
__m128 acc = _mm_setzero_ps(); // set to (0, 0, 0, 0)
float temp[4];

long i;
for (i = 0; i + 4 < len; i += 4) {
X = _mm_loadu_ps(x + i); // load chunk of 4 floats
Y = _mm_loadu_ps(y + i);
acc = _mm_add_ps(acc, _mm_mul_ps(X, Y));
Z = _mm_mul_ps(X, Y);
acc = _mm_add_ps(acc, Z);
}
_mm_storeu_ps(&temp[0], acc); // store acc into an array
inner_prod = temp[0] + temp[1] + temp[2] + temp[3];
Expand All @@ -60,6 +69,27 @@ float simd_dot(const float* x, const float* y, const long& len) {
}
return inner_prod;
}
#else
float simd_dot(const float* x, const float* y, const long& len) {
#pragma message("USE NEON")
float inner_prod=0.0f;
float32x4_t X,Y,Z;// 128-bit values
float32x4_t acc=vdupq_n_f32(0.0f);//set to (0, 0, 0, 0)
long i;
for (i = 0; i + 4 < len; i += 4) {
X = vld1q_f32(x + i);// load chunk of 4 floats
Y = vld1q_f32(y + i);
Z = vmulq_f32(X, Y);
acc = vaddq_f32(acc, Z);
}
inner_prod=vgetq_lane_f32(acc, 0)+vgetq_lane_f32(acc, 1)+vgetq_lane_f32(acc, 2) +vgetq_lane_f32(acc, 3);
for (; i < len; ++i) {
inner_prod += x[i] * y[i];
}
return inner_prod;
}
#endif


void matrix_procuct(const float* A, const float* B, float* C, const int n,
const int m, const int k, bool ta, bool tb) {
Expand Down