1 // Auto-generated file. Do not edit!
2 // Template: src/f32-sigmoid/avx512f-lut16-p3-perm-scalef.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/intrinsics-polyfill.h>
16 #include <xnnpack/vunary.h>
17
18
xnn_f32_sigmoid_ukernel__avx512f_rr1_lut16_p3_perm_scalef_nr1fma_x16(size_t n,const float * x,float * y,const void * params)19 void xnn_f32_sigmoid_ukernel__avx512f_rr1_lut16_p3_perm_scalef_nr1fma_x16(
20 size_t n,
21 const float* x,
22 float* y,
23 const void* params)
24 {
25 assert(n % sizeof(float) == 0);
26
27 const __m512i vsign_mask = _mm512_set1_epi32(0x80000000);
28 const __m512 vmagic_bias = _mm512_set1_ps(0x1.800000p19f);
29 const __m512 vlog2e = _mm512_set1_ps(0x1.715476p0f);
30 const __m512 vtable = _mm512_set_ps(
31 0x1.EA4AFAp+0f, 0x1.D5818Ep+0f, 0x1.C199BEp+0f, 0x1.AE89FAp+0f,
32 0x1.9C4918p+0f, 0x1.8ACE54p+0f, 0x1.7A1148p+0f, 0x1.6A09E6p+0f,
33 0x1.5AB07Ep+0f, 0x1.4BFDAEp+0f, 0x1.3DEA64p+0f, 0x1.306FE0p+0f,
34 0x1.2387A6p+0f, 0x1.172B84p+0f, 0x1.0B5586p+0f, 0x1.000000p+0f);
35 const __m512 vminus_ln2 = _mm512_set1_ps(-0x1.62E43p-1f);
36 const __m512 vc3 = _mm512_set1_ps(0x1.55559Ap-3f);
37 const __m512 vc2 = _mm512_set1_ps(0x1.00021Ep-1f);
38 const __m512 vone = _mm512_set1_ps(1.0f);
39
40 for (; n >= 16 * sizeof(float); n -= 16 * sizeof(float)) {
41 const __m512 vx = _mm512_loadu_ps(x);
42 x += 16;
43
44 const __m512 vz = _mm512_castsi512_ps(_mm512_or_epi32(_mm512_castps_si512(vx), vsign_mask));
45
46 __m512 vn = _mm512_fmadd_ps(vz, vlog2e, vmagic_bias);
47 const __m512 vl = _mm512_permutexvar_ps(_mm512_castps_si512(vn), vtable);
48 vn = _mm512_sub_ps(vn, vmagic_bias);
49
50 __m512 vt = _mm512_fmadd_ps(vn, vminus_ln2, vz);
51
52 __m512 vp = _mm512_fmadd_ps(vt, vc3, vc2);
53 vp = _mm512_mul_ps(vp, vt);
54 vp = _mm512_fmadd_ps(vt, vp, vt);
55 vp = _mm512_fmadd_ps(vl, vp, vl);
56
57 const __m512 ve = _mm512_scalef_ps(vp, vn);
58 const __m512 vd = _mm512_add_ps(ve, vone);
59
60 __m512 vr = _mm512_rcp14_ps(vd);
61 vr = _mm512_fmadd_ps(_mm512_fnmadd_ps(vr, vd, vone), vr, vr);
62
63 __m512 vf = _mm512_mul_ps(ve, vr);
64
65 vf = _mm512_mask_sub_ps(vf, _mm512_testn_epi32_mask(_mm512_castps_si512(vx), vsign_mask), vone, vf);
66
67 _mm512_storeu_ps(y, vf);
68 y += 16;
69 }
70 if XNN_UNLIKELY(n != 0) {
71 assert(n >= 1 * sizeof(float));
72 assert(n <= 15 * sizeof(float));
73
74 // Prepare mask for valid 32-bit elements (depends on n).
75 n >>= 2 /* log2(sizeof(float)) */;
76 const __mmask16 vmask = _cvtu32_mask16((uint16_t) ((uint32_t) (UINT32_C(1) << n) - UINT32_C(1)));
77
78 const __m512 vx = _mm512_maskz_loadu_ps(vmask, x);
79 const __m512 vz = _mm512_castsi512_ps(_mm512_or_epi32(_mm512_castps_si512(vx), vsign_mask));
80
81 __m512 vn = _mm512_fmadd_ps(vz, vlog2e, vmagic_bias);
82 const __m512 vl = _mm512_permutexvar_ps(_mm512_castps_si512(vn), vtable);
83 vn = _mm512_sub_ps(vn, vmagic_bias);
84
85 __m512 vt = _mm512_fmadd_ps(vn, vminus_ln2, vz);
86
87 __m512 vp = _mm512_fmadd_ps(vt, vc3, vc2);
88 vp = _mm512_mul_ps(vp, vt);
89 vp = _mm512_fmadd_ps(vt, vp, vt);
90 vp = _mm512_fmadd_ps(vl, vp, vl);
91
92 const __m512 ve = _mm512_scalef_ps(vp, vn);
93 const __m512 vd = _mm512_add_ps(ve, vone);
94
95 __m512 vr = _mm512_rcp14_ps(vd);
96 vr = _mm512_fmadd_ps(_mm512_fnmadd_ps(vr, vd, vone), vr, vr);
97
98 __m512 vf = _mm512_mul_ps(ve, vr);
99
100 vf = _mm512_mask_sub_ps(vf, _mm512_testn_epi32_mask(_mm512_castps_si512(vx), vsign_mask), vone, vf);
101
102 _mm512_mask_storeu_ps(y, vmask, vf);
103 }
104 }
105