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volk_32f_reciprocal_32f.h
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/* -*- c++ -*- */
/*
* Copyright 2024 Magnus Lundmark <magnuslundmark@gmail.com>
*
* This file is part of VOLK
*
* SPDX-License-Identifier: LGPL-3.0-or-later
*/
#ifndef INCLUDED_volk_32f_reciprocal_32f_a_H
#define INCLUDED_volk_32f_reciprocal_32f_a_H
#ifdef LV_HAVE_GENERIC
static inline void
volk_32f_reciprocal_32f_generic(float* out, const float* in, unsigned int num_points)
{
for (unsigned int i = 0; i < num_points; i++) {
out[i] = 1.f / in[i];
}
}
#endif /* LV_HAVE_GENERIC */
#ifdef LV_HAVE_SSE
#include <xmmintrin.h>
static inline void
volk_32f_reciprocal_32f_a_sse(float* out, const float* in, unsigned int num_points)
{
const __m128 ONE = _mm_set_ps1(1.f);
const unsigned int quarter_points = num_points / 4;
for (unsigned int number = 0; number < quarter_points; number++) {
__m128 x = _mm_load_ps(in);
in += 4;
__m128 r = _mm_div_ps(ONE, x);
_mm_store_ps(out, r);
out += 4;
}
const unsigned int done = quarter_points * 4;
volk_32f_reciprocal_32f_generic(out, in, num_points - done);
}
#endif /* LV_HAVE_SSE */
#ifdef LV_HAVE_AVX
#include <immintrin.h>
static inline void
volk_32f_reciprocal_32f_a_avx(float* out, const float* in, unsigned int num_points)
{
const __m256 ONE = _mm256_set1_ps(1.f);
const unsigned int eighth_points = num_points / 8;
for (unsigned int number = 0; number < eighth_points; number++) {
__m256 x = _mm256_load_ps(in);
in += 8;
__m256 r = _mm256_div_ps(ONE, x);
_mm256_store_ps(out, r);
out += 8;
}
const unsigned int done = eighth_points * 8;
volk_32f_reciprocal_32f_generic(out, in, num_points - done);
}
#endif /* LV_HAVE_AVX */
#ifdef LV_HAVE_AVX512F
#include <immintrin.h>
static inline void
volk_32f_reciprocal_32f_a_avx512(float* out, const float* in, unsigned int num_points)
{
const unsigned int sixteenth_points = num_points / 16;
for (unsigned int number = 0; number < sixteenth_points; number++) {
__m512 x = _mm512_load_ps(in);
in += 16;
__m512 r = _mm512_rcp14_ps(x);
_mm512_store_ps(out, r);
out += 16;
}
const unsigned int done = sixteenth_points * 16;
volk_32f_reciprocal_32f_generic(out, in, num_points - done);
}
#endif /* LV_HAVE_AVX512F */
#endif /* INCLUDED_volk_32f_reciprocal_32f_a_H */
#ifndef INCLUDED_volk_32f_reciprocal_32f_u_H
#define INCLUDED_volk_32f_reciprocal_32f_u_H
#ifdef LV_HAVE_SSE
#include <xmmintrin.h>
static inline void
volk_32f_reciprocal_32f_u_sse(float* out, const float* in, unsigned int num_points)
{
const __m128 ONE = _mm_set_ps1(1.f);
const unsigned int quarter_points = num_points / 4;
for (unsigned int number = 0; number < quarter_points; number++) {
__m128 x = _mm_loadu_ps(in);
in += 4;
__m128 r = _mm_div_ps(ONE, x);
_mm_storeu_ps(out, r);
out += 4;
}
const unsigned int done = quarter_points * 4;
volk_32f_reciprocal_32f_generic(out, in, num_points - done);
}
#endif /* LV_HAVE_SSE */
#ifdef LV_HAVE_AVX
#include <immintrin.h>
static inline void
volk_32f_reciprocal_32f_u_avx(float* out, const float* in, unsigned int num_points)
{
const __m256 ONE = _mm256_set1_ps(1.f);
const unsigned int eighth_points = num_points / 8;
for (unsigned int number = 0; number < eighth_points; number++) {
__m256 x = _mm256_loadu_ps(in);
in += 8;
__m256 r = _mm256_div_ps(ONE, x);
_mm256_storeu_ps(out, r);
out += 8;
}
const unsigned int done = eighth_points * 8;
volk_32f_reciprocal_32f_generic(out, in, num_points - done);
}
#endif /* LV_HAVE_AVX */
#ifdef LV_HAVE_AVX512F
#include <immintrin.h>
static inline void
volk_32f_reciprocal_32f_u_avx512(float* out, const float* in, unsigned int num_points)
{
const unsigned int sixteenth_points = num_points / 16;
for (unsigned int number = 0; number < sixteenth_points; number++) {
__m512 x = _mm512_loadu_ps(in);
in += 16;
__m512 r = _mm512_rcp14_ps(x);
_mm512_storeu_ps(out, r);
out += 16;
}
const unsigned int done = sixteenth_points * 16;
volk_32f_reciprocal_32f_generic(out, in, num_points - done);
}
#endif /* LV_HAVE_AVX512F */
#ifdef LV_HAVE_NEONV8
#include <arm_neon.h>
static inline void
volk_32f_reciprocal_32f_neonv8(float* out, const float* in, unsigned int num_points)
{
const unsigned int eighth_points = num_points / 8;
float32x4_t vOne = vdupq_n_f32(1.0f);
for (unsigned int number = 0; number < eighth_points; number++) {
float32x4_t x0 = vld1q_f32(in);
float32x4_t x1 = vld1q_f32(in + 4);
__VOLK_PREFETCH(in + 8);
in += 8;
float32x4_t r0 = vdivq_f32(vOne, x0);
float32x4_t r1 = vdivq_f32(vOne, x1);
vst1q_f32(out, r0);
vst1q_f32(out + 4, r1);
out += 8;
}
const unsigned int done = eighth_points * 8;
for (unsigned int i = done; i < num_points; i++) {
*out++ = 1.0f / *in++;
}
}
#endif /* LV_HAVE_NEONV8 */
#ifdef LV_HAVE_RVV
#include <riscv_vector.h>
static inline void
volk_32f_reciprocal_32f_rvv(float* out, const float* in, unsigned int num_points)
{
size_t n = num_points;
for (size_t vl; n > 0; n -= vl, in += vl, out += vl) {
vl = __riscv_vsetvl_e32m8(n);
vfloat32m8_t v = __riscv_vle32_v_f32m8(in, vl);
__riscv_vse32(out, __riscv_vfrdiv(v, 1.0f, vl), vl);
}
}
#endif /*LV_HAVE_RVV*/
#endif /* INCLUDED_volk_32f_reciprocal_32f_u_H */