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simd_utils_avx_float.h
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simd_utils_avx_float.h
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/*
* Project : SIMD_Utils
* Version : 0.2.6
* Author : JishinMaster
* Licence : BSD-2
*/
#pragma once
#include <stdint.h>
#include "immintrin.h"
#if 0
/* Compare */
_CMP_EQ_OQ 0x00 /* Equal (ordered, non-signaling) */
_CMP_LT_OS 0x01 /* Less-than (ordered, signaling) */
_CMP_LE_OS 0x02 /* Less-than-or-equal (ordered, signaling) */
_CMP_UNORD_Q 0x03 /* Unordered (non-signaling) */
_CMP_NEQ_UQ 0x04 /* Not-equal (unordered, non-signaling) */
_CMP_NLT_US 0x05 /* Not-less-than (unordered, signaling) */
_CMP_NLE_US 0x06 /* Not-less-than-or-equal (unordered, signaling) */
_CMP_ORD_Q 0x07 /* Ordered (nonsignaling) */
_CMP_EQ_UQ 0x08 /* Equal (unordered, non-signaling) */
_CMP_NGE_US 0x09 /* Not-greater-than-or-equal (unord, signaling) */
_CMP_NGT_US 0x0a /* Not-greater-than (unordered, signaling) */
_CMP_FALSE_OQ 0x0b /* False (ordered, non-signaling) */
_CMP_NEQ_OQ 0x0c /* Not-equal (ordered, non-signaling) */
_CMP_GE_OS 0x0d /* Greater-than-or-equal (ordered, signaling) */
_CMP_GT_OS 0x0e /* Greater-than (ordered, signaling) */
_CMP_TRUE_UQ 0x0f /* True (unordered, non-signaling) */
_CMP_EQ_OS 0x10 /* Equal (ordered, signaling) */
_CMP_LT_OQ 0x11 /* Less-than (ordered, non-signaling) */
_CMP_LE_OQ 0x12 /* Less-than-or-equal (ordered, non-signaling) */
_CMP_UNORD_S 0x13 /* Unordered (signaling) */
_CMP_NEQ_US 0x14 /* Not-equal (unordered, signaling) */
_CMP_NLT_UQ 0x15 /* Not-less-than (unordered, non-signaling) */
_CMP_NLE_UQ 0x16 /* Not-less-than-or-equal (unord, non-signaling) */
_CMP_ORD_S 0x17 /* Ordered (signaling) */
_CMP_EQ_US 0x18 /* Equal (unordered, signaling) */
_CMP_NGE_UQ 0x19 /* Not-greater-than-or-equal (unord, non-sign) */
_CMP_NGT_UQ 0x1a /* Not-greater-than (unordered, non-signaling) */
_CMP_FALSE_OS 0x1b /* False (ordered, signaling) */
_CMP_NEQ_OS 0x1c /* Not-equal (ordered, signaling) */
_CMP_GE_OQ 0x1d /* Greater-than-or-equal (ordered, non-signaling) */
_CMP_GT_OQ 0x1e /* Greater-than (ordered, non-signaling) */
_CMP_TRUE_US 0x1f /* True (unordered, signaling) */
#endif
static inline v8sf log10256_ps(v8sf x)
{
#ifdef LLVMMCA
__asm volatile("# LLVM-MCA-BEGIN log10256_ps" ::
: "memory");
#endif
v8si imm0;
v8sf one = *(v8sf *) _ps256_1;
v8sf invalid_mask = _mm256_cmp_ps(x, _mm256_setzero_ps(), _CMP_LE_OS);
x = _mm256_max_ps(x, *(v8sf *) _ps256_min_norm_pos); /* cut off denormalized stuff */
// can be done with AVX2
imm0 = _mm256_srli_epi32(_mm256_castps_si256(x), 23);
/* keep only the fractional part */
x = _mm256_and_ps(x, *(v8sf *) _ps256_inv_mant_mask);
x = _mm256_or_ps(x, *(v8sf *) _ps256_0p5);
// this is again another AVX2 instruction
imm0 = _mm256_sub_epi32(imm0, *(v8si *) _pi32_256_0x7f);
v8sf e = _mm256_cvtepi32_ps(imm0);
e = _mm256_add_ps(e, one);
v8sf mask = _mm256_cmp_ps(x, *(v8sf *) _ps256_cephes_SQRTHF, _CMP_LT_OS);
v8sf tmp = _mm256_and_ps(x, mask);
x = _mm256_sub_ps(x, one);
e = _mm256_sub_ps(e, _mm256_and_ps(one, mask));
x = _mm256_add_ps(x, tmp);
v8sf z = _mm256_mul_ps(x, x);
v8sf y = _mm256_fmadd_ps_custom(*(v8sf *) _ps256_cephes_log_p0, x, *(v8sf *) _ps256_cephes_log_p1);
y = _mm256_fmadd_ps_custom(y, x, *(v8sf *) _ps256_cephes_log_p2);
y = _mm256_fmadd_ps_custom(y, x, *(v8sf *) _ps256_cephes_log_p3);
y = _mm256_fmadd_ps_custom(y, x, *(v8sf *) _ps256_cephes_log_p4);
y = _mm256_fmadd_ps_custom(y, x, *(v8sf *) _ps256_cephes_log_p5);
y = _mm256_fmadd_ps_custom(y, x, *(v8sf *) _ps256_cephes_log_p6);
y = _mm256_fmadd_ps_custom(y, x, *(v8sf *) _ps256_cephes_log_p7);
y = _mm256_fmadd_ps_custom(y, x, *(v8sf *) _ps256_cephes_log_p8);
y = _mm256_mul_ps(y, x);
y = _mm256_mul_ps(y, z);
y = _mm256_fnmadd_ps_custom(z, *(v8sf *) _ps256_0p5, y);
// Could it be improved with more parallelism or would it worsen precision?
tmp = _mm256_add_ps(x, y);
z = _mm256_mul_ps(tmp, *(v8sf *) _ps256_cephes_L10EB);
z = _mm256_fmadd_ps_custom(y, *(v8sf *) _ps256_cephes_L10EA, z);
z = _mm256_fmadd_ps_custom(x, *(v8sf *) _ps256_cephes_L10EA, z);
z = _mm256_fmadd_ps_custom(e, *(v8sf *) _ps256_cephes_L102B, z);
x = _mm256_fmadd_ps_custom(e, *(v8sf *) _ps256_cephes_L102A, z);
x = _mm256_or_ps(x, invalid_mask); // negative arg will be NAN
#ifdef LLVMMCA
__asm volatile("# LLVM-MCA-END log10256_ps" ::
: "memory");
#endif
return x;
}
static inline v8sf log2256_ps(v8sf x)
{
v8si imm0;
v8sf one = *(v8sf *) _ps256_1;
v8sf invalid_mask = _mm256_cmp_ps(x, _mm256_setzero_ps(), _CMP_LE_OS);
x = _mm256_max_ps(x, *(v8sf *) _ps256_min_norm_pos); /* cut off denormalized stuff */
// can be done with AVX2
imm0 = _mm256_srli_epi32(_mm256_castps_si256(x), 23);
/* keep only the fractional part */
x = _mm256_and_ps(x, *(v8sf *) _ps256_inv_mant_mask);
x = _mm256_or_ps(x, *(v8sf *) _ps256_0p5);
// this is again another AVX2 instruction
imm0 = _mm256_sub_epi32(imm0, *(v8si *) _pi32_256_0x7f);
v8sf e = _mm256_cvtepi32_ps(imm0);
e = _mm256_add_ps(e, one);
v8sf mask = _mm256_cmp_ps(x, *(v8sf *) _ps256_cephes_SQRTHF, _CMP_LT_OS);
v8sf tmp = _mm256_and_ps(x, mask);
x = _mm256_sub_ps(x, one);
e = _mm256_sub_ps(e, _mm256_and_ps(one, mask));
x = _mm256_add_ps(x, tmp);
v8sf z = _mm256_mul_ps(x, x);
v8sf y = _mm256_fmadd_ps_custom(*(v8sf *) _ps256_cephes_log_p0, x, *(v8sf *) _ps256_cephes_log_p1);
y = _mm256_fmadd_ps_custom(y, x, *(v8sf *) _ps256_cephes_log_p2);
y = _mm256_fmadd_ps_custom(y, x, *(v8sf *) _ps256_cephes_log_p3);
y = _mm256_fmadd_ps_custom(y, x, *(v8sf *) _ps256_cephes_log_p4);
y = _mm256_fmadd_ps_custom(y, x, *(v8sf *) _ps256_cephes_log_p5);
y = _mm256_fmadd_ps_custom(y, x, *(v8sf *) _ps256_cephes_log_p6);
y = _mm256_fmadd_ps_custom(y, x, *(v8sf *) _ps256_cephes_log_p7);
y = _mm256_fmadd_ps_custom(y, x, *(v8sf *) _ps256_cephes_log_p8);
y = _mm256_mul_ps(y, x);
y = _mm256_mul_ps(y, z);
y = _mm256_fnmadd_ps_custom(z, *(v8sf *) _ps256_0p5, y);
// Could it be improved with more parallelism or would it worsen precision?
tmp = _mm256_add_ps(y, x);
z = _mm256_mul_ps(y, *(v8sf *) _ps256_cephes_LOG2EA);
z = _mm256_fmadd_ps_custom(x, *(v8sf *) _ps256_cephes_LOG2EA, z);
z = _mm256_add_ps(z, tmp);
x = _mm256_add_ps(z, e);
x = _mm256_or_ps(x, invalid_mask); // negative arg will be NAN
return x;
}
static inline void log10256f(float *src, float *dst, int len)
{
const v8sf invln10f = _mm256_set1_ps((float) INVLN10); //_mm256_broadcast_ss(&invln10f_mask);
int stop_len = len / AVX_LEN_FLOAT;
stop_len *= AVX_LEN_FLOAT;
if (areAligned2((uintptr_t) (src), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf src_tmp = log256_ps(_mm256_load_ps(src + i));
_mm256_store_ps(dst + i, _mm256_mul_ps(src_tmp, invln10f));
}
} else {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf src_tmp = log256_ps(_mm256_loadu_ps(src + i));
_mm256_storeu_ps(dst + i, _mm256_mul_ps(src_tmp, invln10f));
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = log10f(src[i]);
}
}
static inline void log10256f_precise(float *src, float *dst, int len)
{
int stop_len = len / AVX_LEN_FLOAT;
stop_len *= AVX_LEN_FLOAT;
if (areAligned2((uintptr_t) (src), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf src_tmp = log10256_ps(_mm256_load_ps(src + i));
_mm256_store_ps(dst + i, src_tmp);
}
} else {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf src_tmp = log10256_ps(_mm256_loadu_ps(src + i));
_mm256_storeu_ps(dst + i, src_tmp);
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = log10f(src[i]);
}
}
static inline void log2256f(float *src, float *dst, int len)
{
const v8sf invln2f = _mm256_set1_ps((float) INVLN2); //_mm256_broadcast_ss(&invln10f_mask);
int stop_len = len / AVX_LEN_FLOAT;
stop_len *= AVX_LEN_FLOAT;
if (areAligned2((uintptr_t) (src), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf src_tmp = log256_ps(_mm256_load_ps(src + i));
_mm256_store_ps(dst + i, _mm256_mul_ps(src_tmp, invln2f));
}
} else {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf src_tmp = log256_ps(_mm256_loadu_ps(src + i));
_mm256_storeu_ps(dst + i, _mm256_mul_ps(src_tmp, invln2f));
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = log2f(src[i]);
}
}
static inline void log2256f_precise(float *src, float *dst, int len)
{
int stop_len = len / AVX_LEN_FLOAT;
stop_len *= AVX_LEN_FLOAT;
if (areAligned2((uintptr_t) (src), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf src_tmp = log2256_ps(_mm256_load_ps(src + i));
_mm256_store_ps(dst + i, src_tmp);
}
} else {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf src_tmp = log2256_ps(_mm256_loadu_ps(src + i));
_mm256_storeu_ps(dst + i, src_tmp);
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = log2f(src[i]);
}
}
static inline void ln256f(float *src, float *dst, int len)
{
int stop_len = len / AVX_LEN_FLOAT;
stop_len *= AVX_LEN_FLOAT;
if (areAligned2((uintptr_t) (src), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
_mm256_store_ps(dst + i, log256_ps(_mm256_load_ps(src + i)));
}
} else {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
_mm256_storeu_ps(dst + i, log256_ps(_mm256_loadu_ps(src + i)));
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = logf(src[i]);
}
}
static inline void exp256f(float *src, float *dst, int len)
{
int stop_len = len / AVX_LEN_FLOAT;
stop_len *= AVX_LEN_FLOAT;
if (areAligned2((uintptr_t) (src), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
_mm256_store_ps(dst + i, exp256_ps(_mm256_load_ps(src + i)));
}
} else {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
_mm256_storeu_ps(dst + i, exp256_ps(_mm256_loadu_ps(src + i)));
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = expf(src[i]);
}
}
// rewritten alternate version which properly returns MAXNUMF or 0.0 outside of boundaries
static inline v8sf exp256_ps_alternate(v8sf x)
{
v8sf z_tmp, z, fx;
v8si n;
v8sf xsupmaxlogf, xinfminglogf;
xsupmaxlogf = _mm256_cmp_ps(x, *(v8sf *) _ps256_MAXLOGF, _CMP_GT_OS);
xinfminglogf = _mm256_cmp_ps(x, *(v8sf *) _ps256_MINLOGF, _CMP_LT_OS);
/* Express e**x = e**g 2**n
* = e**g e**( n loge(2) )
* = e**( g + n loge(2) )
*/
fx = _mm256_fmadd_ps_custom(*(v8sf *) _ps256_cephes_LOG2EF, x, *(v8sf *) _ps256_0p5);
z = _mm256_round_ps(fx, _MM_FROUND_FLOOR);
x = _mm256_fmadd_ps_custom(z, *(v8sf *) _ps256_cephes_exp_minC1, x);
x = _mm256_fmadd_ps_custom(z, *(v8sf *) _ps256_cephes_exp_minC2, x);
n = _mm256_cvttps_epi32(z);
n = _mm256_add_epi32(n, *(v8si *) _pi32_256_0x7f);
n = _mm256_slli_epi32(n, 23);
v8sf pow2n = _mm256_castsi256_ps(n);
z = _mm256_mul_ps(x, x);
z_tmp = _mm256_fmadd_ps_custom(*(v8sf *) _ps256_cephes_exp_p0, x, *(v8sf *) _ps256_cephes_exp_p1);
z_tmp = _mm256_fmadd_ps_custom(z_tmp, x, *(v8sf *) _ps256_cephes_exp_p2);
z_tmp = _mm256_fmadd_ps_custom(z_tmp, x, *(v8sf *) _ps256_cephes_exp_p3);
z_tmp = _mm256_fmadd_ps_custom(z_tmp, x, *(v8sf *) _ps256_cephes_exp_p4);
z_tmp = _mm256_fmadd_ps_custom(z_tmp, x, *(v8sf *) _ps256_cephes_exp_p5);
z_tmp = _mm256_fmadd_ps_custom(z_tmp, z, x);
z_tmp = _mm256_add_ps(z_tmp, *(v8sf *) _ps256_1);
/* build 2^n */
z_tmp = _mm256_mul_ps(z_tmp, pow2n);
z = _mm256_blendv_ps(z_tmp, *(v8sf *) _ps256_MAXNUMF, xsupmaxlogf);
z = _mm256_blendv_ps(z, _mm256_setzero_ps(), xinfminglogf);
return z;
}
#ifdef __AVX2__
// from https://stackoverflow.com/questions/57454416/AVX-integer-2n-powers-of-2-for-32-bit-integers-without-avx2
static inline v8sf power_of_two256f(v8si b)
{
/*#ifndef __AVX2__
v8si exp = _mm256_add_epi32(b, _mm256_set1_epi32(127));
v8sf f = _mm256_castsi256_ps(_mm256_slli_epi32(exp, 23));
return f;
#else*/
return _mm256_cvtepi32_ps(_mm256_sllv_epi32(*(v8si *) _pi32_256_1, b));
//#endif
}
static inline v8sf cbrt256f_ps(v8sf xx)
{
v8sf e, rem, sign;
v8sf x, z;
x = xx;
// sign = _mm256_cmp_ps(x, _mm256_setzero_ps(), _CMP_GT_OS);
sign = _mm256_and_ps(xx, *(v8sf *) _ps256_sign_mask);
x = _mm256_and_ps(x, *(v8sf *) _ps256_pos_sign_mask);
z = x;
/* extract power of 2, leaving
* mantissa between 0.5 and 1
*/
// x = frexpf(x, &e);
// solve problem for zero
v8si emm0 = _mm256_srli_epi32(_mm256_castps_si256(x), 23);
x = _mm256_and_ps(x, *(v8sf *) _ps256_inv_mant_mask);
x = _mm256_or_ps(x, *(v8sf *) _ps256_0p5);
emm0 = _mm256_sub_epi32(emm0, *(v8si *) _pi32_256_0x7e);
e = _mm256_cvtepi32_ps(emm0);
/* Approximate cube root of number between .5 and 1,
* peak relative error = 9.2e-6
*/
v8sf tmp;
tmp = _mm256_fmadd_ps_custom(*(v8sf *) _ps256_CBRTF_P0, x, *(v8sf *) _ps256_CBRTF_P1);
tmp = _mm256_fmadd_ps_custom(x, tmp, *(v8sf *) _ps256_CBRTF_P2);
tmp = _mm256_fmadd_ps_custom(x, tmp, *(v8sf *) _ps256_CBRTF_P3);
x = _mm256_fmadd_ps_custom(x, tmp, *(v8sf *) _ps256_CBRTF_P4);
/* exponent divided by 3 */
v8sf e_sign = _mm256_cmp_ps(e, _mm256_setzero_ps(), _CMP_GE_OS);
e = _mm256_and_ps(e, *(v8sf *) _ps256_pos_sign_mask);
rem = e;
e = _mm256_mul_ps(e, *(v8sf *) _ps256_0p3);
e = _mm256_round_ps(e, ROUNDTOZERO);
rem = _mm256_fnmadd_ps_custom(e, *(v8sf *) _ps256_3, rem);
v8sf mul1, mul2;
v8sf mul_cst1 = _mm256_blendv_ps(*(v8sf *) _ps256_cephes_invCBRT2, *(v8sf *) _ps256_cephes_CBRT2, e_sign);
v8sf mul_cst2 = _mm256_blendv_ps(*(v8sf *) _ps256_cephes_invCBRT4, *(v8sf *) _ps256_cephes_CBRT4, e_sign);
mul1 = _mm256_mul_ps(x, mul_cst1);
mul2 = _mm256_mul_ps(x, mul_cst2);
v8si remi = _mm256_cvtps_epi32(rem); // rem integer
v8si rem1 = _mm256_cmpeq_epi32(remi, _mm256_set1_epi32(1));
v8si rem2 = _mm256_cmpeq_epi32(remi, _mm256_set1_epi32(2));
x = _mm256_blendv_ps(x, mul1, _mm256_castsi256_ps(rem1)); // rem==1
x = _mm256_blendv_ps(x, mul2, _mm256_castsi256_ps(rem2)); // rem==2
/* multiply by power of 2 */
// x = ldexpf(x, e);
// x= x* (1 >> e)
v8sf cst = power_of_two256f(_mm256_cvtps_epi32(e));
// blend sign of e
x = _mm256_blendv_ps(_mm256_div_ps(x, cst), _mm256_mul_ps(x, cst), e_sign);
/* Newton iteration */
// x -= (x - (z / (x * x))) * 0.333333333333;
v8sf tmp2 = _mm256_mul_ps(x, x);
tmp2 = _mm256_div_ps(z, tmp2);
tmp2 = _mm256_sub_ps(x, tmp2);
x = _mm256_fnmadd_ps_custom(tmp2, *(v8sf *) _ps256_0p3, x);
// x = _mm256_blendv_ps(_mm256_mul_ps(x, *(v8sf *) _ps256_min1), x, sign);
x = _mm256_xor_ps(x, sign);
return x;
}
static inline void cbrt256f(float *src, float *dst, int len)
{
int stop_len = len / (AVX_LEN_FLOAT);
stop_len *= (AVX_LEN_FLOAT);
if (areAligned2((uintptr_t) (src), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf x = _mm256_load_ps(src + i);
v8sf dst_tmp = cbrt256f_ps(x);
_mm256_store_ps(dst + i, dst_tmp);
}
} else {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf x = _mm256_loadu_ps(src + i);
v8sf dst_tmp = cbrt256f_ps(x);
_mm256_storeu_ps(dst + i, dst_tmp);
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = cbrtf(src[i]);
}
}
#endif
static inline void fabs256f(float *src, float *dst, int len)
{
int stop_len = len / (2 * AVX_LEN_FLOAT);
stop_len *= (2 * AVX_LEN_FLOAT);
if (areAligned2((uintptr_t) (src), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf src_tmp = _mm256_load_ps(src + i);
v8sf src_tmp2 = _mm256_load_ps(src + i + AVX_LEN_FLOAT);
v8sf fabs1 = _mm256_and_ps(*(v8sf *) _ps256_pos_sign_mask, src_tmp);
v8sf fabs2 = _mm256_and_ps(*(v8sf *) _ps256_pos_sign_mask, src_tmp2);
_mm256_store_ps(dst + i, fabs1);
_mm256_store_ps(dst + i + AVX_LEN_FLOAT, fabs2);
}
} else {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf src_tmp = _mm256_loadu_ps(src + i);
v8sf src_tmp2 = _mm256_loadu_ps(src + i + AVX_LEN_FLOAT);
v8sf fabs1 = _mm256_and_ps(*(v8sf *) _ps256_pos_sign_mask, src_tmp);
v8sf fabs2 = _mm256_and_ps(*(v8sf *) _ps256_pos_sign_mask, src_tmp2);
_mm256_storeu_ps(dst + i, fabs1);
_mm256_storeu_ps(dst + i + AVX_LEN_FLOAT, fabs2);
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = fabsf(src[i]);
}
}
static inline void set256f(float *dst, float value, int len)
{
const v8sf tmp = _mm256_set1_ps(value); //_mm256_broadcast_ss(&value); //avx broadcast vs mm_set_ps?
int stop_len = len / AVX_LEN_FLOAT;
stop_len *= AVX_LEN_FLOAT;
if (((uintptr_t) (const void *) (dst) % AVX_LEN_BYTES) == 0) {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
_mm256_store_ps(dst + i, tmp);
}
} else {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
_mm256_storeu_ps(dst + i, tmp);
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = value;
}
}
static inline void zero256f(float *dst, int len)
{
const v8sf tmp = _mm256_setzero_ps();
int stop_len = len / AVX_LEN_FLOAT;
stop_len *= AVX_LEN_FLOAT;
if (((uintptr_t) (const void *) (dst) % AVX_LEN_BYTES) == 0) {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
_mm256_store_ps(dst + i, tmp);
}
} else {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
_mm256_storeu_ps(dst + i, tmp);
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = 0.0f;
}
}
static inline void copy256f(float *src, float *dst, int len)
{
int stop_len = len / (2 * AVX_LEN_FLOAT);
stop_len *= (2 * AVX_LEN_FLOAT);
if (areAligned2((uintptr_t) (src), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf src_tmp = _mm256_load_ps(src + i);
v8sf src_tmp2 = _mm256_load_ps(src + i + AVX_LEN_FLOAT);
_mm256_store_ps(dst + i, src_tmp);
_mm256_store_ps(dst + i + AVX_LEN_FLOAT, src_tmp2);
}
} else {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf src_tmp = _mm256_loadu_ps(src + i);
v8sf src_tmp2 = _mm256_loadu_ps(src + i + AVX_LEN_FLOAT);
_mm256_storeu_ps(dst + i, src_tmp);
_mm256_storeu_ps(dst + i + AVX_LEN_FLOAT, src_tmp2);
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = src[i];
}
}
static inline void add256f(float *src1, float *src2, float *dst, int len)
{
int stop_len = len / (2 * AVX_LEN_FLOAT);
stop_len *= (2 * AVX_LEN_FLOAT);
if (areAligned3((uintptr_t) (src1), (uintptr_t) (src2), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf a = _mm256_load_ps(src1 + i);
v8sf b = _mm256_load_ps(src2 + i);
v8sf a2 = _mm256_load_ps(src1 + i + AVX_LEN_FLOAT);
v8sf b2 = _mm256_load_ps(src2 + i + AVX_LEN_FLOAT);
v8sf dst_tmp = _mm256_add_ps(a, b);
v8sf dst_tmp2 = _mm256_add_ps(a2, b2);
_mm256_store_ps(dst + i, dst_tmp);
_mm256_store_ps(dst + i + AVX_LEN_FLOAT, dst_tmp2);
}
} else {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf a = _mm256_loadu_ps(src1 + i);
v8sf b = _mm256_loadu_ps(src2 + i);
v8sf a2 = _mm256_loadu_ps(src1 + i + AVX_LEN_FLOAT);
v8sf b2 = _mm256_loadu_ps(src2 + i + AVX_LEN_FLOAT);
v8sf dst_tmp = _mm256_add_ps(a, b);
v8sf dst_tmp2 = _mm256_add_ps(a2, b2);
_mm256_storeu_ps(dst + i, dst_tmp);
_mm256_storeu_ps(dst + i + AVX_LEN_FLOAT, dst_tmp2);
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = src1[i] + src2[i];
}
}
static inline void mul256f(float *src1, float *src2, float *dst, int len)
{
int stop_len = len / (2 * AVX_LEN_FLOAT);
stop_len *= (2 * AVX_LEN_FLOAT);
if (areAligned3((uintptr_t) (src1), (uintptr_t) (src2), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf a = _mm256_load_ps(src1 + i);
v8sf b = _mm256_load_ps(src2 + i);
v8sf a2 = _mm256_load_ps(src1 + i + AVX_LEN_FLOAT);
v8sf b2 = _mm256_load_ps(src2 + i + AVX_LEN_FLOAT);
v8sf dst_tmp = _mm256_mul_ps(a, b);
v8sf dst_tmp2 = _mm256_mul_ps(a2, b2);
_mm256_store_ps(dst + i, dst_tmp);
_mm256_store_ps(dst + i + AVX_LEN_FLOAT, dst_tmp2);
}
} else {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf a = _mm256_loadu_ps(src1 + i);
v8sf b = _mm256_loadu_ps(src2 + i);
v8sf a2 = _mm256_loadu_ps(src1 + i + AVX_LEN_FLOAT);
v8sf b2 = _mm256_loadu_ps(src2 + i + AVX_LEN_FLOAT);
v8sf dst_tmp = _mm256_mul_ps(a, b);
v8sf dst_tmp2 = _mm256_mul_ps(a2, b2);
_mm256_storeu_ps(dst + i, dst_tmp);
_mm256_storeu_ps(dst + i + AVX_LEN_FLOAT, dst_tmp2);
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = src1[i] * src2[i];
}
}
static inline void sub256f(float *src1, float *src2, float *dst, int len)
{
int stop_len = len / (2 * AVX_LEN_FLOAT);
stop_len *= (2 * AVX_LEN_FLOAT);
if (areAligned3((uintptr_t) (src1), (uintptr_t) (src2), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf a = _mm256_load_ps(src1 + i);
v8sf b = _mm256_load_ps(src2 + i);
v8sf a2 = _mm256_load_ps(src1 + i + AVX_LEN_FLOAT);
v8sf b2 = _mm256_load_ps(src2 + i + AVX_LEN_FLOAT);
v8sf dst_tmp = _mm256_sub_ps(a, b);
v8sf dst_tmp2 = _mm256_sub_ps(a2, b2);
_mm256_store_ps(dst + i, dst_tmp);
_mm256_store_ps(dst + i + AVX_LEN_FLOAT, dst_tmp2);
}
} else {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf a = _mm256_loadu_ps(src1 + i);
v8sf b = _mm256_loadu_ps(src2 + i);
v8sf a2 = _mm256_loadu_ps(src1 + i + AVX_LEN_FLOAT);
v8sf b2 = _mm256_loadu_ps(src2 + i + AVX_LEN_FLOAT);
v8sf dst_tmp = _mm256_sub_ps(a, b);
v8sf dst_tmp2 = _mm256_sub_ps(a2, b2);
_mm256_storeu_ps(dst + i, dst_tmp);
_mm256_storeu_ps(dst + i + AVX_LEN_FLOAT, dst_tmp2);
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = src1[i] - src2[i];
}
}
static inline void addc256f(float *src, float value, float *dst, int len)
{
const v8sf tmp = _mm256_set1_ps(value); //_mm256_broadcast_ss(&value); //avx broadcast vs mm_set_ps?
int stop_len = len / (2 * AVX_LEN_FLOAT);
stop_len *= (2 * AVX_LEN_FLOAT);
if (areAligned2((uintptr_t) (src), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf a = _mm256_load_ps(src + i);
v8sf a2 = _mm256_load_ps(src + i + AVX_LEN_FLOAT);
v8sf dst_tmp = _mm256_add_ps(a, tmp);
v8sf dst_tmp2 = _mm256_add_ps(a2, tmp);
_mm256_store_ps(dst + i, dst_tmp);
_mm256_store_ps(dst + i + AVX_LEN_FLOAT, dst_tmp2);
}
} else {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf a = _mm256_loadu_ps(src + i);
v8sf a2 = _mm256_loadu_ps(src + i + AVX_LEN_FLOAT);
v8sf dst_tmp = _mm256_add_ps(a, tmp);
v8sf dst_tmp2 = _mm256_add_ps(a2, tmp);
_mm256_storeu_ps(dst + i, dst_tmp);
_mm256_storeu_ps(dst + i + AVX_LEN_FLOAT, dst_tmp2);
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = src[i] + value;
}
}
static inline void mulc256f(float *src, float value, float *dst, int len)
{
const v8sf tmp = _mm256_set1_ps(value); //_mm256_broadcast_ss(&value); //avx broadcast vs mm_set_ps?
int stop_len = len / (2 * AVX_LEN_FLOAT);
stop_len *= (2 * AVX_LEN_FLOAT);
if (areAligned2((uintptr_t) (src), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf src_tmp1 = _mm256_load_ps(src + i);
v8sf src_tmp2 = _mm256_load_ps(src + i + AVX_LEN_FLOAT);
v8sf dst_tmp1 = _mm256_mul_ps(tmp, src_tmp1);
v8sf dst_tmp2 = _mm256_mul_ps(tmp, src_tmp2);
_mm256_store_ps(dst + i, dst_tmp1);
_mm256_store_ps(dst + i + AVX_LEN_FLOAT, dst_tmp2);
}
} else {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf src_tmp1 = _mm256_loadu_ps(src + i);
v8sf src_tmp2 = _mm256_loadu_ps(src + i + AVX_LEN_FLOAT);
v8sf dst_tmp1 = _mm256_mul_ps(tmp, src_tmp1);
v8sf dst_tmp2 = _mm256_mul_ps(tmp, src_tmp2);
_mm256_storeu_ps(dst + i, dst_tmp1);
_mm256_storeu_ps(dst + i + AVX_LEN_FLOAT, dst_tmp2);
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = src[i] * value;
}
}
static inline void muladd256f(float *_a, float *_b, float *_c, float *dst, int len)
{
int stop_len = len / (2 * AVX_LEN_FLOAT);
stop_len *= (2 * AVX_LEN_FLOAT);
if (areAligned2((uintptr_t) (_a), (uintptr_t) (_b), AVX_LEN_BYTES) &&
areAligned2((uintptr_t) (_c), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf a = _mm256_load_ps(_a + i);
v8sf b = _mm256_load_ps(_b + i);
v8sf c = _mm256_load_ps(_c + i);
v8sf a2 = _mm256_load_ps(_a + i + AVX_LEN_FLOAT);
v8sf b2 = _mm256_load_ps(_b + i + AVX_LEN_FLOAT);
v8sf c2 = _mm256_load_ps(_c + i + AVX_LEN_FLOAT);
v8sf dst_tmp = _mm256_fmadd_ps_custom(a, b, c);
v8sf dst_tmp2 = _mm256_fmadd_ps_custom(a2, b2, c2);
_mm256_store_ps(dst + i, dst_tmp);
_mm256_store_ps(dst + i + AVX_LEN_FLOAT, dst_tmp2);
}
} else {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8sf a = _mm256_loadu_ps(_a + i);
v8sf b = _mm256_loadu_ps(_b + i);
v8sf c = _mm256_loadu_ps(_c + i);
v8sf a2 = _mm256_loadu_ps(_a + i + AVX_LEN_FLOAT);
v8sf b2 = _mm256_loadu_ps(_b + i + AVX_LEN_FLOAT);
v8sf c2 = _mm256_loadu_ps(_c + i + AVX_LEN_FLOAT);
v8sf dst_tmp = _mm256_fmadd_ps_custom(a, b, c);
v8sf dst_tmp2 = _mm256_fmadd_ps_custom(a2, b2, c2);
_mm256_storeu_ps(dst + i, dst_tmp);
_mm256_storeu_ps(dst + i + AVX_LEN_FLOAT, dst_tmp2);
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = (_a[i] * _b[i]) + _c[i];
}
}
static inline void mulcadd256f(float *_a, float _b, float *_c, float *dst, int len)
{
v8sf b = _mm256_set1_ps(_b);
int stop_len = len / AVX_LEN_FLOAT;
stop_len *= AVX_LEN_FLOAT;
if (areAligned3((uintptr_t) (_a), (uintptr_t) (_c), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf a = _mm256_load_ps(_a + i);
v8sf c = _mm256_load_ps(_c + i);
_mm256_store_ps(dst + i, _mm256_fmadd_ps_custom(a, b, c));
}
} else {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf a = _mm256_loadu_ps(_a + i);
v8sf c = _mm256_loadu_ps(_c + i);
_mm256_storeu_ps(dst + i, _mm256_fmadd_ps_custom(a, b, c));
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = _a[i] * _b + _c[i];
}
}
static inline void mulcaddc256f(float *_a, float _b, float _c, float *dst, int len)
{
v8sf b = _mm256_set1_ps(_b);
v8sf c = _mm256_set1_ps(_c);
int stop_len = len / AVX_LEN_FLOAT;
stop_len *= AVX_LEN_FLOAT;
if (areAligned2((uintptr_t) (_a), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf a = _mm256_loadu_ps(_a + i);
_mm256_store_ps(dst + i, _mm256_fmadd_ps_custom(a, b, c));
}
} else {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf a = _mm256_loadu_ps(_a + i);
_mm256_storeu_ps(dst + i, _mm256_fmadd_ps_custom(a, b, c));
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = _a[i] * _b + _c;
}
}
static inline void muladdc256f(float *_a, float *_b, float _c, float *dst, int len)
{
v8sf c = _mm256_set1_ps(_c);
int stop_len = len / AVX_LEN_FLOAT;
stop_len *= AVX_LEN_FLOAT;
if (areAligned3((uintptr_t) (_a), (uintptr_t) (_b), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf a = _mm256_load_ps(_a + i);
v8sf b = _mm256_load_ps(_b + i);
_mm256_store_ps(dst + i, _mm256_fmadd_ps_custom(a, b, c));
}
} else {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
v8sf a = _mm256_loadu_ps(_a + i);
v8sf b = _mm256_loadu_ps(_b + i);
_mm256_storeu_ps(dst + i, _mm256_fmadd_ps_custom(a, b, c));
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = _a[i] * _b[i] + _c;
}
}
static inline void div256f(float *src1, float *src2, float *dst, int len)
{
int stop_len = len / AVX_LEN_FLOAT;
stop_len *= AVX_LEN_FLOAT;
if (areAligned3((uintptr_t) (src1), (uintptr_t) (src2), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
_mm256_store_ps(dst + i, _mm256_div_ps(_mm256_load_ps(src1 + i), _mm256_load_ps(src2 + i)));
}
} else {
for (int i = 0; i < stop_len; i += AVX_LEN_FLOAT) {
_mm256_storeu_ps(dst + i, _mm256_div_ps(_mm256_loadu_ps(src1 + i), _mm256_loadu_ps(src2 + i)));
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = src1[i] / src2[i];
}
}
// TODO : remove previous index dependency to become Out Of Order
// TODO: intel targets can do 2 mul/FMA per cycle but only one add => replace add_ps(a,b) by fmadd_ps(1.0f,a,b)
static inline void vectorSlope256f(float *dst, int len, float offset, float slope)
{
v8sf coef = _mm256_set_ps(7.0f * slope, 6.0f * slope, 5.0f * slope, 4.0f * slope, 3.0f * slope, 2.0f * slope, slope, 0.0f);
v8sf slope16_vec = _mm256_set1_ps(16.0f * slope);
v8sf curVal = _mm256_add_ps(_mm256_set1_ps(offset), coef);
v8sf curVal2 = _mm256_add_ps(_mm256_set1_ps(offset), coef);
curVal2 = _mm256_add_ps(curVal2, _mm256_set1_ps(8.0f * slope));
int stop_len = len / (2 * AVX_LEN_FLOAT);
stop_len *= (2 * AVX_LEN_FLOAT);
if (len >= 2*AVX_LEN_FLOAT) {
if (((uintptr_t) (const void *) (dst) % AVX_LEN_BYTES) == 0) {
_mm256_store_ps(dst + 0, curVal);
_mm256_store_ps(dst + AVX_LEN_FLOAT, curVal2);
} else {
_mm256_storeu_ps(dst + 0, curVal);
_mm256_storeu_ps(dst + AVX_LEN_FLOAT, curVal2);
}
if (((uintptr_t) (const void *) (dst) % AVX_LEN_BYTES) == 0) {
for (int i = 2 * AVX_LEN_FLOAT; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
curVal = _mm256_add_ps(curVal, slope16_vec);
_mm256_store_ps(dst + i, curVal);
curVal2 = _mm256_add_ps(curVal2, slope16_vec);
_mm256_store_ps(dst + i + AVX_LEN_FLOAT, curVal2);
}
} else {
for (int i = 2 * AVX_LEN_FLOAT; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
curVal = _mm256_add_ps(curVal, slope16_vec);
_mm256_storeu_ps(dst + i, curVal);
curVal2 = _mm256_add_ps(curVal2, slope16_vec);
_mm256_storeu_ps(dst + i + AVX_LEN_FLOAT, curVal2);
}
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = offset + slope * (float) i;
}
}
#ifdef __AVX2__
#if 0
static inline void convertInt16ToFloat32_256(int16_t *src, float *dst, int len, int scale_factor)
{
int stop_len = len / (2 * AVX_LEN_FLOAT);
stop_len *= (2 * AVX_LEN_FLOAT);
float scale_fact_mult = 1.0f / (float) (1 << scale_factor);
v8sf scale_fact_vec = _mm256_set1_ps(scale_fact_mult);
if (areAligned2((uintptr_t) (src), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8si vec = _mm256_load_si256((__m256i *) (src + i)); // loads 1 2 3 4 5 6 7 8 8 9 10 11 12 13 14 15 16
v8si low_unordered = _mm256_unpacklo_epi16(vec, vec); // low 1 1 2 2 3 3 4 4 9 9 10 10 11 11 12 12
v8si high_unordered = _mm256_unpackhi_epi16(vec, vec); // high 5 5 6 6 7 7 8 8 13 13 14 14 15 15 16 16
v8si low = _mm256_permute2f128_si256(low_unordered, high_unordered, 0x20); // low 1 1 2 2 3 3 4 45 5 6 6 7 7 8 8
v8si high = _mm256_permute2f128_si256(low_unordered, high_unordered, 0x31); // high 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16
low = _mm256_srai_epi32(low, 0x10); // make low 1 -1 2 -1 3 -1 4 -4
high = _mm256_srai_epi32(high, 0x10); // make high 5 -1 6 -1 7 -1 8 -1
// convert the vector to float and scale it
v8sf floatlo = _mm256_mul_ps(_mm256_cvtepi32_ps(low), scale_fact_vec);
v8sf floathi = _mm256_mul_ps(_mm256_cvtepi32_ps(high), scale_fact_vec);
_mm256_store_ps(dst + i, floatlo);
_mm256_store_ps(dst + i + AVX_LEN_FLOAT, floathi);
}
} else {
for (int i = 0; i < stop_len; i += 2 * AVX_LEN_FLOAT) {
v8si vec = _mm256_loadu_si256((__m256i *) (src + i)); // loads 1 2 3 4 5 6 7 8 8 9 10 11 12 13 14 15 16
v8si low_unordered = _mm256_unpacklo_epi16(vec, vec); // low 1 1 2 2 3 3 4 4 9 9 10 10 11 11 12 12
v8si high_unordered = _mm256_unpackhi_epi16(vec, vec); // high 5 5 6 6 7 7 8 8 13 13 14 14 15 15 16 16
v8si low = _mm256_permute2f128_si256(low_unordered, high_unordered, 0x20); // low 1 1 2 2 3 3 4 45 5 6 6 7 7 8 8
v8si high = _mm256_permute2f128_si256(low_unordered, high_unordered, 0x31); // high 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16
low = _mm256_srai_epi32(low, 0x10); // make low 1 -1 2 -1 3 -1 4 -4
high = _mm256_srai_epi32(high, 0x10); // make high 5 -1 6 -1 7 -1 8 -1
// convert the vector to float and scale it
v8sf floatlo = _mm256_mul_ps(_mm256_cvtepi32_ps(low), scale_fact_vec);
v8sf floathi = _mm256_mul_ps(_mm256_cvtepi32_ps(high), scale_fact_vec);
_mm256_storeu_ps(dst + i, floatlo);
_mm256_storeu_ps(dst + i + AVX_LEN_FLOAT, floathi);
}
}
for (int i = stop_len; i < len; i++) {
dst[i] = (float) src[i] * scale_fact_mult;
}
}
#else
static inline void convertInt16ToFloat32_256(int16_t *src, float *dst, int len, int scale_factor)
{
int stop_len = len / (4 * AVX_LEN_FLOAT);
stop_len *= (4 * AVX_LEN_FLOAT);
float scale_fact_mult = 1.0f / (float) (1 << scale_factor);
v8sf scale_fact_vec = _mm256_set1_ps(scale_fact_mult);
if (areAligned2((uintptr_t) (src), (uintptr_t) (dst), AVX_LEN_BYTES)) {
for (int i = 0; i < stop_len; i += 4 * AVX_LEN_FLOAT) {
v8si vec = _mm256_load_si256((__m256i *) (src + i)); // loads 1 2 3 4 5 6 7 8 8 9 10 11 12 13 14 15 16
v8si low_unordered = _mm256_unpacklo_epi16(vec, vec); // low 1 1 2 2 3 3 4 4 9 9 10 10 11 11 12 12
v8si high_unordered = _mm256_unpackhi_epi16(vec, vec); // high 5 5 6 6 7 7 8 8 13 13 14 14 15 15 16 16
v8si low = _mm256_permute2f128_si256(low_unordered, high_unordered, 0x20); // low 1 1 2 2 3 3 4 45 5 6 6 7 7 8 8
v8si high = _mm256_permute2f128_si256(low_unordered, high_unordered, 0x31); // high 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16
low = _mm256_srai_epi32(low, 0x10); // make low 1 -1 2 -1 3 -1 4 -4
high = _mm256_srai_epi32(high, 0x10); // make high 5 -1 6 -1 7 -1 8 -1
v8sf floatlo = _mm256_cvtepi32_ps(low); // convert the vector to float and scale it
floatlo = _mm256_mul_ps(floatlo, scale_fact_vec);
v8sf floathi = _mm256_cvtepi32_ps(high);
floathi = _mm256_mul_ps(floathi, scale_fact_vec);
_mm256_store_ps(dst + i, floatlo);
_mm256_store_ps(dst + i + AVX_LEN_FLOAT, floathi);
v8si vec2 = _mm256_load_si256((__m256i *) (src + i + 2 * AVX_LEN_FLOAT));
v8si low_unordered2 = _mm256_unpacklo_epi16(vec2, vec2);
v8si high_unordered2 = _mm256_unpackhi_epi16(vec2, vec2);
v8si low2 = _mm256_permute2f128_si256(low_unordered2, high_unordered2, 0x20);
v8si high2 = _mm256_permute2f128_si256(low_unordered2, high_unordered2, 0x31);
low2 = _mm256_srai_epi32(low2, 0x10);
high2 = _mm256_srai_epi32(high2, 0x10);
v8sf floatlo2 = _mm256_cvtepi32_ps(low2);
floatlo2 = _mm256_mul_ps(floatlo2, scale_fact_vec);
v8sf floathi2 = _mm256_cvtepi32_ps(high2);
floathi2 = _mm256_mul_ps(floathi2, scale_fact_vec);
_mm256_store_ps(dst + i + 2 * AVX_LEN_FLOAT, floatlo2);
_mm256_store_ps(dst + i + 3 * AVX_LEN_FLOAT, floathi2);
}
} else {
for (int i = 0; i < stop_len; i += 4 * AVX_LEN_FLOAT) {
v8si vec = _mm256_loadu_si256((__m256i *) (src + i)); // loads 1 2 3 4 5 6 7 8 8 9 10 11 12 13 14 15 16
v8si low_unordered = _mm256_unpacklo_epi16(vec, vec); // low 1 1 2 2 3 3 4 4 9 9 10 10 11 11 12 12
v8si high_unordered = _mm256_unpackhi_epi16(vec, vec); // high 5 5 6 6 7 7 8 8 13 13 14 14 15 15 16 16
v8si low = _mm256_permute2f128_si256(low_unordered, high_unordered, 0x20); // low 1 1 2 2 3 3 4 45 5 6 6 7 7 8 8
v8si high = _mm256_permute2f128_si256(low_unordered, high_unordered, 0x31); // high 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16
low = _mm256_srai_epi32(low, 0x10); // make low 1 -1 2 -1 3 -1 4 -4
high = _mm256_srai_epi32(high, 0x10); // make high 5 -1 6 -1 7 -1 8 -1
v8sf floatlo = _mm256_cvtepi32_ps(low); // convert the vector to float and scale it
floatlo = _mm256_mul_ps(floatlo, scale_fact_vec);