1 // Auto-generated file. Do not edit!
2 //   Template: src/f32-velu/avx2-rr1-lut8-p4-perm.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 static const int32_t mask_table[14] = {-1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0};
19 
xnn_f32_velu_ukernel__avx2_rr1_lut8_p4_perm_x16(size_t n,const float * x,float * y,const union xnn_f32_elu_params params[restrict XNN_MIN_ELEMENTS (1)])20 void xnn_f32_velu_ukernel__avx2_rr1_lut8_p4_perm_x16(
21     size_t n,
22     const float* x,
23     float* y,
24     const union xnn_f32_elu_params params[restrict XNN_MIN_ELEMENTS(1)])
25 {
26   assert(n % sizeof(float) == 0);
27 
28   const __m256 vprescale = _mm256_broadcast_ps((const __m128*) params->sse.prescale);
29   const __m256 valpha = _mm256_broadcast_ps((const __m128*) params->sse.alpha);
30   const __m256 vbeta = _mm256_broadcast_ps((const __m128*) params->sse.beta);
31 
32   const __m256 vsat_cutoff = _mm256_set1_ps(-0x1.154246p+4f);
33   const __m256 vmagic_bias = _mm256_set1_ps(0x1.800000p20f);
34   const __m256 vlog2e = _mm256_set1_ps(0x1.715476p+0f);
35   const __m256i vtable = _mm256_set_epi32(
36     0x3F7AC0C7, 0x3F7744FD, 0x3F75672A, 0x3F7504F3, 0x3F75FED7, 0x3F7837F0, 0x3F7B95C2, 0x3F800000);
37   const __m256 vminus_ln2 = _mm256_set1_ps(-0x1.62E43p-1f);
38   const __m256 vc4 = _mm256_set1_ps(0x1.5558ECp-5f);
39   const __m256 vc3 = _mm256_set1_ps(0x1.555C20p-3f);
40   const __m256 vc2 = _mm256_set1_ps(0x1.000000p-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 ven0 = _mm256_slli_epi32(_mm256_castps_si256(vn0), 20);
54     const __m256i vl0 = _mm256_permutevar8x32_epi32(vtable, _mm256_castps_si256(vn0));
55     vn0 = _mm256_sub_ps(vn0, vmagic_bias);
56     const __m256i ven1 = _mm256_slli_epi32(_mm256_castps_si256(vn1), 20);
57     const __m256i vl1 = _mm256_permutevar8x32_epi32(vtable, _mm256_castps_si256(vn1));
58     vn1 = _mm256_sub_ps(vn1, vmagic_bias);
59 
60     __m256 vs0 = _mm256_castsi256_ps(_mm256_add_epi32(vl0, ven0));
61     __m256 vt0 = _mm256_fmadd_ps(vn0, vminus_ln2, vz0);
62     __m256 vs1 = _mm256_castsi256_ps(_mm256_add_epi32(vl1, ven1));
63     __m256 vt1 = _mm256_fmadd_ps(vn1, vminus_ln2, vz1);
64 
65     __m256 vp0 = _mm256_fmadd_ps(vc4, vt0, vc3);
66     __m256 vp1 = _mm256_fmadd_ps(vc4, vt1, vc3);
67 
68     vp0 = _mm256_fmadd_ps(vp0, vt0, vc2);
69     vp1 = _mm256_fmadd_ps(vp1, 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 ven = _mm256_slli_epi32(_mm256_castps_si256(vn), 20);
101     const __m256i vl = _mm256_permutevar8x32_epi32(vtable, _mm256_castps_si256(vn));
102     __m256 vs = _mm256_castsi256_ps(_mm256_add_epi32(vl, ven));
103     vn = _mm256_sub_ps(vn, vmagic_bias);
104 
105     __m256 vt = _mm256_fmadd_ps(vn, vminus_ln2, vz);
106 
107     __m256 vp = _mm256_fmadd_ps(vc4, vt, vc3);
108     vp = _mm256_fmadd_ps(vp, vt, vc2);
109     vp = _mm256_mul_ps(vp, vt);
110 
111     vt = _mm256_mul_ps(vt, vs);
112     vs = _mm256_fmsub_ps(vs, valpha, valpha);
113     vp = _mm256_fmadd_ps(vp, vt, vt);
114     const __m256 ve = _mm256_fmadd_ps(vp, valpha, vs);
115 
116     vx = _mm256_mul_ps(vx, vbeta);
117     const __m256 vy = _mm256_blendv_ps(vx, ve, vx);
118 
119     _mm256_storeu_ps(y, vy);
120     y += 8;
121   }
122   if XNN_UNLIKELY(n != 0) {
123     assert(n >= 1 * sizeof(float));
124     assert(n <= 7 * sizeof(float));
125     __m256i vmask = _mm256_loadu_si256((const __m256i*) ((uintptr_t) &mask_table[7] - n));
126 
127     __m256 vx = _mm256_maskload_ps(x, vmask);
128 
129     const __m256 vz = _mm256_max_ps(vsat_cutoff, _mm256_mul_ps(vx, vprescale));
130 
131     __m256 vn = _mm256_fmadd_ps(vz, vlog2e, vmagic_bias);
132     const __m256i ven = _mm256_slli_epi32(_mm256_castps_si256(vn), 20);
133     const __m256i vl = _mm256_permutevar8x32_epi32(vtable, _mm256_castps_si256(vn));
134     __m256 vs = _mm256_castsi256_ps(_mm256_add_epi32(vl, ven));
135     vn = _mm256_sub_ps(vn, vmagic_bias);
136 
137     __m256 vt = _mm256_fmadd_ps(vn, vminus_ln2, vz);
138 
139     __m256 vp = _mm256_fmadd_ps(vc4, vt, vc3);
140     vp = _mm256_fmadd_ps(vp, vt, vc2);
141     vp = _mm256_mul_ps(vp, vt);
142 
143     vt = _mm256_mul_ps(vt, vs);
144     vs = _mm256_fmsub_ps(vs, valpha, valpha);
145     vp = _mm256_fmadd_ps(vp, vt, vt);
146     const __m256 ve = _mm256_fmadd_ps(vp, valpha, vs);
147 
148     vx = _mm256_mul_ps(vx, vbeta);
149     const __m256 vy = _mm256_blendv_ps(vx, ve, vx);
150 
151     // _mm256_maskstore_ps(y, vmask, vf) could be used here, but triggers msan failures (probably an msan bug).
152     __m128 vy_lo = _mm256_castps256_ps128(vy);
153     if (n & (4 * sizeof(float))) {
154       _mm_storeu_ps(y, vy_lo);
155       vy_lo = _mm256_extractf128_ps(vy, 1);
156       y += 4;
157     }
158     if (n & (2 * sizeof(float))) {
159       _mm_storel_pi((__m64*) y, vy_lo);
160       vy_lo = _mm_movehl_ps(vy_lo, vy_lo);
161       y += 2;
162     }
163     if (n & (1 * sizeof(float))) {
164       _mm_store_ss(y, vy_lo);
165     }
166   }
167 }
168