1 /*
2 * Copyright (c) 2018, Alliance for Open Media. All rights reserved.
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12 #ifndef AOM_AOM_DSP_X86_SYNONYMS_AVX2_H_
13 #define AOM_AOM_DSP_X86_SYNONYMS_AVX2_H_
14
15 #include <immintrin.h>
16
17 #include "config/aom_config.h"
18
19 #include "aom/aom_integer.h"
20
21 /**
22 * Various reusable shorthands for x86 SIMD intrinsics.
23 *
24 * Intrinsics prefixed with xx_ operate on or return 128bit XMM registers.
25 * Intrinsics prefixed with yy_ operate on or return 256bit YMM registers.
26 */
27
28 // Loads and stores to do away with the tedium of casting the address
29 // to the right type.
yy_load_256(const void * a)30 static inline __m256i yy_load_256(const void *a) {
31 return _mm256_load_si256((const __m256i *)a);
32 }
33
yy_loadu_256(const void * a)34 static inline __m256i yy_loadu_256(const void *a) {
35 return _mm256_loadu_si256((const __m256i *)a);
36 }
37
yy_store_256(void * const a,const __m256i v)38 static inline void yy_store_256(void *const a, const __m256i v) {
39 _mm256_store_si256((__m256i *)a, v);
40 }
41
yy_storeu_256(void * const a,const __m256i v)42 static inline void yy_storeu_256(void *const a, const __m256i v) {
43 _mm256_storeu_si256((__m256i *)a, v);
44 }
45
46 // Fill an AVX register using an interleaved pair of values, ie. set the
47 // 16 channels to {a, b} repeated 8 times, using the same channel ordering
48 // as when a register is stored to / loaded from memory.
49 //
50 // This is useful for rearranging filter kernels for use with the _mm_madd_epi16
51 // instruction
yy_set2_epi16(int16_t a,int16_t b)52 static inline __m256i yy_set2_epi16(int16_t a, int16_t b) {
53 return _mm256_setr_epi16(a, b, a, b, a, b, a, b, a, b, a, b, a, b, a, b);
54 }
55
56 // Some compilers don't have _mm256_set_m128i defined in immintrin.h. We
57 // therefore define an equivalent function using a different intrinsic.
58 // ([ hi ], [ lo ]) -> [ hi ][ lo ]
yy_set_m128i(__m128i hi,__m128i lo)59 static inline __m256i yy_set_m128i(__m128i hi, __m128i lo) {
60 return _mm256_insertf128_si256(_mm256_castsi128_si256(lo), hi, 1);
61 }
62
63 // This behaves similarly to _mm256_set_epi64x(), but avoids undefined
64 // sanitizer warnings when loading values from unaligned buffers using
65 // `*(int64_t *)val`.
yy_loadu_4x64(const void * e3,const void * e2,const void * e1,const void * e0)66 static inline __m256i yy_loadu_4x64(const void *e3, const void *e2,
67 const void *e1, const void *e0) {
68 __m128d v0 = _mm_castsi128_pd(_mm_loadl_epi64((const __m128i *)e0));
69 __m128d v01 = _mm_loadh_pd(v0, (const double *)e1);
70 __m128d v2 = _mm_castsi128_pd(_mm_loadl_epi64((const __m128i *)e2));
71 __m128d v23 = _mm_loadh_pd(v2, (const double *)e3);
72 // Note this can be replaced with
73 // `_mm256_castpd_si256(_mm256_set_m128d(v23, v01))` if immintrin.h contains
74 // _mm256_set_m128d() with all supported compilers. This version is used to
75 // match the behavior with yy_set_m128i().
76 return yy_set_m128i(_mm_castpd_si128(v23), _mm_castpd_si128(v01));
77 }
78
yy_loadu2_128(const void * hi,const void * lo)79 static inline __m256i yy_loadu2_128(const void *hi, const void *lo) {
80 __m128i mhi = _mm_loadu_si128((const __m128i *)(hi));
81 __m128i mlo = _mm_loadu_si128((const __m128i *)(lo));
82 return yy_set_m128i(mhi, mlo);
83 }
84
yy_storeu2_128(void * hi,void * lo,const __m256i a)85 static inline void yy_storeu2_128(void *hi, void *lo, const __m256i a) {
86 _mm_storeu_si128((__m128i *)hi, _mm256_extracti128_si256(a, 1));
87 _mm_storeu_si128((__m128i *)lo, _mm256_castsi256_si128(a));
88 }
89
yy_roundn_epu16(__m256i v_val_w,int bits)90 static inline __m256i yy_roundn_epu16(__m256i v_val_w, int bits) {
91 const __m256i v_s_w = _mm256_srli_epi16(v_val_w, bits - 1);
92 return _mm256_avg_epu16(v_s_w, _mm256_setzero_si256());
93 }
94 #endif // AOM_AOM_DSP_X86_SYNONYMS_AVX2_H_
95