1 // Auto-generated file. Do not edit!
2 // Template: src/f32-velu/avx2-rr1-lut16-p3-gather.c.in
3 // Generator: tools/xngen
4 //
5 // Copyright 2020 Google LLC
6 //
7 // This source code is licensed under the BSD-style license found in the
8 // LICENSE file in the root directory of this source tree.
9
10 #include <assert.h>
11
12 #include <immintrin.h>
13
14 #include <xnnpack/common.h>
15 #include <xnnpack/vunary.h>
16
17
18 extern XNN_INTERNAL const int xnn_table_exp2minus_k_over_16[16];
19
20 static const int32_t mask_table[14] = {-1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0};
21
xnn_f32_velu_ukernel__avx2_rr1_lut16_p3_gather_x16(size_t n,const float * x,float * y,const union xnn_f32_elu_params params[restrict XNN_MIN_ELEMENTS (1)])22 void xnn_f32_velu_ukernel__avx2_rr1_lut16_p3_gather_x16(
23 size_t n,
24 const float* x,
25 float* y,
26 const union xnn_f32_elu_params params[restrict XNN_MIN_ELEMENTS(1)])
27 {
28 assert(n % sizeof(float) == 0);
29
30 const __m256 vprescale = _mm256_broadcast_ps((const __m128*) params->sse.prescale);
31 const __m256 valpha = _mm256_broadcast_ps((const __m128*) params->sse.alpha);
32 const __m256 vbeta = _mm256_broadcast_ps((const __m128*) params->sse.beta);
33
34 const __m256 vsat_cutoff = _mm256_set1_ps(-0x1.154246p+4f);
35 const __m256 vmagic_bias = _mm256_set1_ps(0x1.800000p19f);
36 const __m256 vlog2e = _mm256_set1_ps(0x1.715476p+0f);
37 const __m256i vindex_mask = _mm256_set1_epi32(0xF);
38 const __m256 vminus_ln2 = _mm256_set1_ps(-0x1.62E43p-1f);
39 const __m256 vc3 = _mm256_set1_ps(0x1.55561Cp-3f);
40 const __m256 vc2 = _mm256_set1_ps(0x1.0001ECp-1f);
41
42 for (; n >= 16 * sizeof(float); n -= 16 * sizeof(float)) {
43 __m256 vx0 = _mm256_loadu_ps(x);
44 __m256 vx1 = _mm256_loadu_ps(x + 8);
45 x += 16;
46
47 const __m256 vz0 = _mm256_max_ps(vsat_cutoff, _mm256_mul_ps(vx0, vprescale));
48 const __m256 vz1 = _mm256_max_ps(vsat_cutoff, _mm256_mul_ps(vx1, vprescale));
49
50 __m256 vn0 = _mm256_fmadd_ps(vz0, vlog2e, vmagic_bias);
51 __m256 vn1 = _mm256_fmadd_ps(vz1, vlog2e, vmagic_bias);
52
53 const __m256i vidx0 = _mm256_and_si256(_mm256_castps_si256(vn0), vindex_mask);
54 const __m256i vl0 = _mm256_i32gather_epi32(xnn_table_exp2minus_k_over_16, vidx0, sizeof(float));
55 const __m256i vidx1 = _mm256_and_si256(_mm256_castps_si256(vn1), vindex_mask);
56 const __m256i vl1 = _mm256_i32gather_epi32(xnn_table_exp2minus_k_over_16, vidx1, sizeof(float));
57
58 const __m256i ven0 = _mm256_slli_epi32(_mm256_castps_si256(vn0), 19);
59 vn0 = _mm256_sub_ps(vn0, vmagic_bias);
60 const __m256i ven1 = _mm256_slli_epi32(_mm256_castps_si256(vn1), 19);
61 vn1 = _mm256_sub_ps(vn1, vmagic_bias);
62
63 __m256 vs0 = _mm256_castsi256_ps(_mm256_add_epi32(vl0, ven0));
64 __m256 vt0 = _mm256_fmadd_ps(vn0, vminus_ln2, vz0);
65 __m256 vs1 = _mm256_castsi256_ps(_mm256_add_epi32(vl1, ven1));
66 __m256 vt1 = _mm256_fmadd_ps(vn1, vminus_ln2, vz1);
67
68 __m256 vp0 = _mm256_fmadd_ps(vc3, vt0, vc2);
69 __m256 vp1 = _mm256_fmadd_ps(vc3, vt1, vc2);
70
71 vp0 = _mm256_mul_ps(vp0, vt0);
72 vt0 = _mm256_mul_ps(vt0, vs0);
73 vp1 = _mm256_mul_ps(vp1, vt1);
74 vt1 = _mm256_mul_ps(vt1, vs1);
75
76 vs0 = _mm256_fmsub_ps(vs0, valpha, valpha);
77 vp0 = _mm256_fmadd_ps(vp0, vt0, vt0);
78 vs1 = _mm256_fmsub_ps(vs1, valpha, valpha);
79 vp1 = _mm256_fmadd_ps(vp1, vt1, vt1);
80
81 const __m256 ve0 = _mm256_fmadd_ps(vp0, valpha, vs0);
82 vx0 = _mm256_mul_ps(vx0, vbeta);
83 const __m256 ve1 = _mm256_fmadd_ps(vp1, valpha, vs1);
84 vx1 = _mm256_mul_ps(vx1, vbeta);
85
86 const __m256 vy0 = _mm256_blendv_ps(vx0, ve0, vx0);
87 const __m256 vy1 = _mm256_blendv_ps(vx1, ve1, vx1);
88
89 _mm256_storeu_ps(y, vy0);
90 _mm256_storeu_ps(y + 8, vy1);
91 y += 16;
92 }
93 for (; n >= 8 * sizeof(float); n -= 8 * sizeof(float)) {
94 __m256 vx = _mm256_loadu_ps(x);
95 x += 8;
96
97 const __m256 vz = _mm256_max_ps(vsat_cutoff, _mm256_mul_ps(vx, vprescale));
98
99 __m256 vn = _mm256_fmadd_ps(vz, vlog2e, vmagic_bias);
100 const __m256i vidx = _mm256_and_si256(_mm256_castps_si256(vn), vindex_mask);
101 const __m256i vl = _mm256_i32gather_epi32(xnn_table_exp2minus_k_over_16, vidx, sizeof(float));
102
103 const __m256i ven = _mm256_slli_epi32(_mm256_castps_si256(vn), 19);
104 vn = _mm256_sub_ps(vn, vmagic_bias);
105
106 __m256 vs = _mm256_castsi256_ps(_mm256_add_epi32(vl, ven));
107 __m256 vt = _mm256_fmadd_ps(vn, vminus_ln2, vz);
108
109 __m256 vp = _mm256_fmadd_ps(vc3, vt, vc2);
110 vp = _mm256_mul_ps(vp, vt);
111
112 vt = _mm256_mul_ps(vt, vs);
113 vs = _mm256_fmsub_ps(vs, valpha, valpha);
114 vp = _mm256_fmadd_ps(vp, vt, vt);
115 const __m256 ve = _mm256_fmadd_ps(vp, valpha, vs);
116
117 vx = _mm256_mul_ps(vx, vbeta);
118 const __m256 vy = _mm256_blendv_ps(vx, ve, vx);
119
120 _mm256_storeu_ps(y, vy);
121 y += 8;
122 }
123 if XNN_UNLIKELY(n != 0) {
124 assert(n >= 1 * sizeof(float));
125 assert(n <= 7 * sizeof(float));
126 __m256i vmask = _mm256_loadu_si256((const __m256i*) ((uintptr_t) &mask_table[7] - n));
127
128 __m256 vx = _mm256_maskload_ps(x, vmask);
129
130 const __m256 vz = _mm256_max_ps(vsat_cutoff, _mm256_mul_ps(vx, vprescale));
131
132 __m256 vn = _mm256_fmadd_ps(vz, vlog2e, vmagic_bias);
133 const __m256i vidx = _mm256_and_si256(_mm256_castps_si256(vn), vindex_mask);
134 const __m256i vl = _mm256_i32gather_epi32(xnn_table_exp2minus_k_over_16, vidx, sizeof(float));
135
136 const __m256i ven = _mm256_slli_epi32(_mm256_castps_si256(vn), 19);
137 vn = _mm256_sub_ps(vn, vmagic_bias);
138
139 __m256 vs = _mm256_castsi256_ps(_mm256_add_epi32(vl, ven));
140 __m256 vt = _mm256_fmadd_ps(vn, vminus_ln2, vz);
141
142 __m256 vp = _mm256_fmadd_ps(vc3, vt, vc2);
143 vp = _mm256_mul_ps(vp, vt);
144
145 vt = _mm256_mul_ps(vt, vs);
146 vs = _mm256_fmsub_ps(vs, valpha, valpha);
147 vp = _mm256_fmadd_ps(vp, vt, vt);
148 const __m256 ve = _mm256_fmadd_ps(vp, valpha, vs);
149
150 vx = _mm256_mul_ps(vx, vbeta);
151 const __m256 vy = _mm256_blendv_ps(vx, ve, vx);
152
153 // _mm256_maskstore_ps(y, vmask, vf) could be used here, but triggers msan failures (probably an msan bug).
154 __m128 vy_lo = _mm256_castps256_ps128(vy);
155 if (n & (4 * sizeof(float))) {
156 _mm_storeu_ps(y, vy_lo);
157 vy_lo = _mm256_extractf128_ps(vy, 1);
158 y += 4;
159 }
160 if (n & (2 * sizeof(float))) {
161 _mm_storel_pi((__m64*) y, vy_lo);
162 vy_lo = _mm_movehl_ps(vy_lo, vy_lo);
163 y += 2;
164 }
165 if (n & (1 * sizeof(float))) {
166 _mm_store_ss(y, vy_lo);
167 }
168 }
169 }
170