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volk_16i_max_star_horizontal_16i.h
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/* -*- c++ -*- */
/*
* Copyright 2012, 2014 Free Software Foundation, Inc.
* Copyright 2023 Magnus Lundmark <magnuslundmark@gmail.com>
*
* This file is part of VOLK
*
* SPDX-License-Identifier: LGPL-3.0-or-later
*/
#ifndef INCLUDED_volk_16i_max_star_horizontal_16i_a_H
#define INCLUDED_volk_16i_max_star_horizontal_16i_a_H
#include <volk/volk_common.h>
#include <inttypes.h>
#include <stdio.h>
#ifdef LV_HAVE_SSSE3
#include <emmintrin.h>
#include <tmmintrin.h>
#include <xmmintrin.h>
static inline void volk_16i_max_star_horizontal_16i_a_ssse3(int16_t* target,
int16_t* src0,
unsigned int num_points)
{
const unsigned int num_bytes = num_points * 2;
static const uint8_t shufmask0[16] = {
0x00, 0x01, 0x04, 0x05, 0x08, 0x09, 0x0c, 0x0d,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
static const uint8_t shufmask1[16] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0x01, 0x04, 0x05, 0x08, 0x09, 0x0c, 0x0d
};
static const uint8_t andmask0[16] = {
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const uint8_t andmask1[16] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02
};
__m128i xmm0 = {}, xmm1 = {}, xmm2 = {}, xmm3 = {}, xmm4 = {};
__m128i xmm5 = {}, xmm6 = {}, xmm7 = {}, xmm8 = {};
xmm4 = _mm_load_si128((__m128i*)shufmask0);
xmm5 = _mm_load_si128((__m128i*)shufmask1);
xmm6 = _mm_load_si128((__m128i*)andmask0);
xmm7 = _mm_load_si128((__m128i*)andmask1);
__m128i *p_target, *p_src0;
p_target = (__m128i*)target;
p_src0 = (__m128i*)src0;
int bound = num_bytes >> 5;
int intermediate = (num_bytes >> 4) & 1;
int leftovers = (num_bytes >> 1) & 7;
int i = 0;
for (i = 0; i < bound; ++i) {
xmm0 = _mm_load_si128(p_src0);
xmm1 = _mm_load_si128(&p_src0[1]);
xmm2 = _mm_xor_si128(xmm2, xmm2);
p_src0 += 2;
xmm3 = _mm_hsub_epi16(xmm0, xmm1);
xmm2 = _mm_cmpgt_epi16(xmm2, xmm3);
xmm8 = _mm_and_si128(xmm2, xmm6);
xmm3 = _mm_and_si128(xmm2, xmm7);
xmm8 = _mm_add_epi8(xmm8, xmm4);
xmm3 = _mm_add_epi8(xmm3, xmm5);
xmm0 = _mm_shuffle_epi8(xmm0, xmm8);
xmm1 = _mm_shuffle_epi8(xmm1, xmm3);
xmm3 = _mm_add_epi16(xmm0, xmm1);
_mm_store_si128(p_target, xmm3);
p_target += 1;
}
if (intermediate) {
xmm0 = _mm_load_si128(p_src0);
xmm2 = _mm_xor_si128(xmm2, xmm2);
p_src0 += 1;
xmm3 = _mm_hsub_epi16(xmm0, xmm1);
xmm2 = _mm_cmpgt_epi16(xmm2, xmm3);
xmm8 = _mm_and_si128(xmm2, xmm6);
xmm3 = _mm_add_epi8(xmm8, xmm4);
xmm0 = _mm_shuffle_epi8(xmm0, xmm3);
_mm_storel_pd((double*)p_target, bit128_p(&xmm0)->double_vec);
p_target = (__m128i*)((int8_t*)p_target + 8);
}
for (i = (bound << 4) + (intermediate << 3);
i < (bound << 4) + (intermediate << 3) + leftovers;
i += 2) {
target[i >> 1] = ((int16_t)(src0[i] - src0[i + 1]) > 0) ? src0[i] : src0[i + 1];
}
}
#endif /*LV_HAVE_SSSE3*/
#ifdef LV_HAVE_NEON
#include <arm_neon.h>
static inline void volk_16i_max_star_horizontal_16i_neon(int16_t* target,
int16_t* src0,
unsigned int num_points)
{
const unsigned int eighth_points = num_points / 16;
unsigned number;
int16x8x2_t input_vec;
int16x8_t diff, max_vec, zeros;
uint16x8_t comp1, comp2;
zeros = vdupq_n_s16(0);
for (number = 0; number < eighth_points; ++number) {
input_vec = vld2q_s16(src0);
//__VOLK_PREFETCH(src0+16);
diff = vsubq_s16(input_vec.val[0], input_vec.val[1]);
comp1 = vcgeq_s16(diff, zeros);
comp2 = vcltq_s16(diff, zeros);
input_vec.val[0] = vandq_s16(input_vec.val[0], (int16x8_t)comp1);
input_vec.val[1] = vandq_s16(input_vec.val[1], (int16x8_t)comp2);
max_vec = vaddq_s16(input_vec.val[0], input_vec.val[1]);
vst1q_s16(target, max_vec);
src0 += 16;
target += 8;
}
for (number = 0; number < num_points % 16; number += 2) {
target[number >> 1] = ((int16_t)(src0[number] - src0[number + 1]) > 0)
? src0[number]
: src0[number + 1];
}
}
#endif /* LV_HAVE_NEON */
#ifdef LV_HAVE_NEONV7
extern void volk_16i_max_star_horizontal_16i_a_neonasm(int16_t* target,
int16_t* src0,
unsigned int num_points);
#endif /* LV_HAVE_NEONV7 */
#ifdef LV_HAVE_GENERIC
static inline void volk_16i_max_star_horizontal_16i_generic(int16_t* target,
int16_t* src0,
unsigned int num_points)
{
const unsigned int num_bytes = num_points * 2;
int i = 0;
int bound = num_bytes >> 1;
for (i = 0; i < bound; i += 2) {
target[i >> 1] = ((int16_t)(src0[i] - src0[i + 1]) > 0) ? src0[i] : src0[i + 1];
}
}
#endif /*LV_HAVE_GENERIC*/
#endif /*INCLUDED_volk_16i_max_star_horizontal_16i_a_H*/