1 // Auto-generated file. Do not edit!
2 // Template: src/f32-vsigmoid/neon-lut64-p2.c.in
3 // Generator: tools/xngen
4 //
5 // Copyright 2019 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 <arm_neon.h>
13
14 #include <xnnpack/common.h>
15 #include <xnnpack/vunary.h>
16
17
18 extern XNN_INTERNAL const float xnn_table_exp2minus_k_over_64[64];
19
xnn_f32_vsigmoid_ukernel__neonfma_rr1_lut64_p2_div_x4(size_t n,const float * x,float * y,const union xnn_f32_sigmoid_params params[restrict XNN_MIN_ELEMENTS (1)])20 void xnn_f32_vsigmoid_ukernel__neonfma_rr1_lut64_p2_div_x4(
21 size_t n,
22 const float* x,
23 float* y,
24 const union xnn_f32_sigmoid_params params[restrict XNN_MIN_ELEMENTS(1)]) XNN_OOB_READS
25 {
26 assert(n % sizeof(float) == 0);
27
28 const float32x4_t vmagic_bias = vld1q_dup_f32(¶ms->neonfma_rr1_lut64_p2.magic_bias);
29 const float32x4_t vminus_log2e = vld1q_dup_f32(¶ms->neonfma_rr1_lut64_p2.minus_log2e);
30 const int32x4_t vindex_mask = vmovq_n_s32(INT32_C(0x3F));
31 const float32x4_t vln2 = vld1q_dup_f32(¶ms->neonfma_rr1_lut64_p2.ln2);
32 const float32x4_t vc2 = vld1q_dup_f32(¶ms->neonfma_rr1_lut64_p2.c2);
33 const float32x4_t vone = vmovq_n_f32(1.0f);
34 const float32x4_t vdenorm_cutoff = vld1q_dup_f32(¶ms->neonfma_rr1_lut64_p2.denorm_cutoff);
35
36 for (; n >= 4 * sizeof(float); n -= 4 * sizeof(float)) {
37 const float32x4_t vx = vld1q_f32(x); x += 4;
38
39 const float32x4_t vz = vabsq_f32(vx);
40
41 float32x4_t vn = vfmaq_f32(vmagic_bias, vz, vminus_log2e);
42 const int32x4_t ve = vshlq_n_s32(vreinterpretq_s32_f32(vn), 17);
43
44 const uint64x2_t vidx = vreinterpretq_u64_s32(vandq_s32(vreinterpretq_s32_f32(vn), vindex_mask));
45 const uint64_t vidx_lo = vgetq_lane_u64(vidx, 0);
46 const uint64_t vidx_hi = vgetq_lane_u64(vidx, 1);
47 float32x2_t vl_lo = vld1_dup_f32(&xnn_table_exp2minus_k_over_64[(uint32_t) vidx_lo]);
48 float32x2_t vl_hi = vld1_dup_f32(&xnn_table_exp2minus_k_over_64[(uint32_t) vidx_hi]);
49 vl_lo = vld1_lane_f32(&xnn_table_exp2minus_k_over_64[(uint32_t) (vidx_lo >> 32)], vl_lo, 1);
50 vl_hi = vld1_lane_f32(&xnn_table_exp2minus_k_over_64[(uint32_t) (vidx_hi >> 32)], vl_hi, 1);
51 const float32x4_t vl = vcombine_f32(vl_lo, vl_hi);
52
53 const float32x4_t vs = vreinterpretq_f32_s32(vaddq_s32(vreinterpretq_s32_f32(vl), ve));
54 vn = vsubq_f32(vn, vmagic_bias);
55 float32x4_t vt = vfmaq_f32(vz, vn, vln2);
56
57 float32x4_t vp = vmulq_f32(vt, vc2);
58 vp = vfmsq_f32(vt, vp, vt);
59
60 const float32x4_t vy = vfmsq_f32(vs, vs, vp);
61 const float32x4_t vd = vaddq_f32(vy, vone);
62
63 float32x4_t vf = vdivq_f32(vy, vd);
64 vf = vreinterpretq_f32_u32(vbicq_u32(vreinterpretq_u32_f32(vf), vcagtq_f32(vx, vdenorm_cutoff)));
65 const uint32x4_t vm = vcltq_f32(vx, vmovq_n_f32(0.0f));
66 vf = vbslq_f32(vm, vf, vsubq_f32(vone, vf));
67
68 vst1q_f32(y, vf); y += 4;
69 }
70 if XNN_UNLIKELY(n != 0) {
71 const float32x4_t vx = vld1q_f32(x);
72
73 const float32x4_t vz = vabsq_f32(vx);
74
75 float32x4_t vn = vfmaq_f32(vmagic_bias, vz, vminus_log2e);
76 const int32x4_t ve = vshlq_n_s32(vreinterpretq_s32_f32(vn), 17);
77
78 const uint64x2_t vidx = vreinterpretq_u64_s32(vandq_s32(vreinterpretq_s32_f32(vn), vindex_mask));
79 const uint64_t vidx_lo = vgetq_lane_u64(vidx, 0);
80 const uint64_t vidx_hi = vgetq_lane_u64(vidx, 1);
81 float32x2_t vl_lo = vld1_dup_f32(&xnn_table_exp2minus_k_over_64[(uint32_t) vidx_lo]);
82 float32x2_t vl_hi = vld1_dup_f32(&xnn_table_exp2minus_k_over_64[(uint32_t) vidx_hi]);
83 vl_lo = vld1_lane_f32(&xnn_table_exp2minus_k_over_64[(uint32_t) (vidx_lo >> 32)], vl_lo, 1);
84 vl_hi = vld1_lane_f32(&xnn_table_exp2minus_k_over_64[(uint32_t) (vidx_hi >> 32)], vl_hi, 1);
85 const float32x4_t vl = vcombine_f32(vl_lo, vl_hi);
86
87 const float32x4_t vs = vreinterpretq_f32_s32(vaddq_s32(vreinterpretq_s32_f32(vl), ve));
88 vn = vsubq_f32(vn, vmagic_bias);
89 float32x4_t vt = vfmaq_f32(vz, vn, vln2);
90
91 float32x4_t vp = vmulq_f32(vt, vc2);
92 vp = vfmsq_f32(vt, vp, vt);
93
94 const float32x4_t vy = vfmsq_f32(vs, vs, vp);
95 const float32x4_t vd = vaddq_f32(vy, vone);
96
97 float32x4_t vf = vdivq_f32(vy, vd);
98 vf = vreinterpretq_f32_u32(vbicq_u32(vreinterpretq_u32_f32(vf), vcagtq_f32(vx, vdenorm_cutoff)));
99 const uint32x4_t vm = vcltq_f32(vx, vmovq_n_f32(0.0f));
100 vf = vbslq_f32(vm, vf, vsubq_f32(vone, vf));
101
102 float32x2_t vf_lo = vget_low_f32(vf);
103 if (n & (2 * sizeof(float))) {
104 vst1_f32(y, vf_lo); y += 2;
105 vf_lo = vget_high_f32(vf);
106 }
107 if (n & (1 * sizeof(float))) {
108 vst1_lane_f32(y, vf_lo, 0);
109 }
110 }
111 }
112