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volk_16i_max_star_16i.h
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/* -*- c++ -*- */
/*
* Copyright 2012, 2014 Free Software Foundation, Inc.
*
* This file is part of VOLK
*
* SPDX-License-Identifier: LGPL-3.0-or-later
*/
#ifndef INCLUDED_volk_16i_max_star_16i_a_H
#define INCLUDED_volk_16i_max_star_16i_a_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_16i_a_ssse3(short* target, short* src0, unsigned int num_points)
{
const unsigned int num_bytes = num_points * 2;
short candidate = src0[0];
short cands[8];
__m128i xmm0, xmm1, xmm3, xmm4, xmm5, xmm6;
__m128i* p_src0;
p_src0 = (__m128i*)src0;
int bound = num_bytes >> 4;
int leftovers = (num_bytes >> 1) & 7;
int i = 0;
xmm1 = _mm_setzero_si128();
xmm0 = _mm_setzero_si128();
//_mm_insert_epi16(xmm0, candidate, 0);
xmm0 = _mm_shuffle_epi8(xmm0, xmm1);
for (i = 0; i < bound; ++i) {
xmm1 = _mm_load_si128(p_src0);
p_src0 += 1;
// xmm2 = _mm_sub_epi16(xmm1, xmm0);
xmm3 = _mm_cmpgt_epi16(xmm0, xmm1);
xmm4 = _mm_cmpeq_epi16(xmm0, xmm1);
xmm5 = _mm_cmpgt_epi16(xmm1, xmm0);
xmm6 = _mm_xor_si128(xmm4, xmm5);
xmm3 = _mm_and_si128(xmm3, xmm0);
xmm4 = _mm_and_si128(xmm6, xmm1);
xmm0 = _mm_add_epi16(xmm3, xmm4);
}
_mm_store_si128((__m128i*)cands, xmm0);
for (i = 0; i < 8; ++i) {
candidate = ((short)(candidate - cands[i]) > 0) ? candidate : cands[i];
}
for (i = 0; i < leftovers; ++i) {
candidate = ((short)(candidate - src0[(bound << 3) + i]) > 0)
? candidate
: src0[(bound << 3) + i];
}
target[0] = candidate;
}
#endif /*LV_HAVE_SSSE3*/
#ifdef LV_HAVE_GENERIC
static inline void
volk_16i_max_star_16i_generic(short* target, short* src0, unsigned int num_points)
{
const unsigned int num_bytes = num_points * 2;
int i = 0;
int bound = num_bytes >> 1;
short candidate = src0[0];
for (i = 1; i < bound; ++i) {
candidate = ((short)(candidate - src0[i]) > 0) ? candidate : src0[i];
}
target[0] = candidate;
}
#endif /*LV_HAVE_GENERIC*/
#endif /*INCLUDED_volk_16i_max_star_16i_a_H*/