File size: 5,750 Bytes
8b7c501
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
// Auto-generated file. Do not edit!
//   Template: src/f16-velu/neonfp16arith-rr1-p3.c.in
//   Generator: tools/xngen
//
// Copyright 2022 Google LLC
//
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree.

#include <assert.h>

#include <arm_neon.h>

#include <xnnpack/common.h>
#include <xnnpack/vunary.h>


void xnn_f16_velu_ukernel__neonfp16arith_rr1_p3_x16(
    size_t batch,
    const void* input,
    void* output,
    const union xnn_f16_elu_params params[restrict XNN_MIN_ELEMENTS(1)]) XNN_OOB_READS
{
  assert(batch != 0);
  assert(batch % sizeof(uint16_t) == 0);
  assert(input != NULL);
  assert(output != NULL);

  const float16x8_t vprescale = vreinterpretq_f16_u16(vld1q_dup_u16(&params->fp16arith_rr1_p3.prescale));
  const float16x8_t vsat_cutoff = vreinterpretq_f16_u16(vld1q_dup_u16(&params->fp16arith_rr1_p3.sat_cutoff));
  const float16x8_t vmagic_bias = vreinterpretq_f16_u16(vld1q_dup_u16(&params->fp16arith_rr1_p3.magic_bias));
  const float16x8_t vlog2e = vreinterpretq_f16_u16(vld1q_dup_u16(&params->fp16arith_rr1_p3.log2e));
  const float16x8_t vminus_ln2 = vreinterpretq_f16_u16(vld1q_dup_u16(&params->fp16arith_rr1_p3.minus_ln2));
  const float16x8_t vc3 = vreinterpretq_f16_u16(vld1q_dup_u16(&params->fp16arith_rr1_p3.c3));
  const float16x8_t vc2 = vreinterpretq_f16_u16(vld1q_dup_u16(&params->fp16arith_rr1_p3.c2));
  const float16x8_t vminus_alpha = vreinterpretq_f16_u16(vld1q_dup_u16(&params->fp16arith_rr1_p3.minus_alpha));
  const float16x8_t vbeta = vreinterpretq_f16_u16(vld1q_dup_u16(&params->fp16arith_rr1_p3.beta));

  const uint16_t* i = (const uint16_t*) input;
  uint16_t* o = (uint16_t*) output;
  for (; batch >= 16 * sizeof(uint16_t); batch -= 16 * sizeof(uint16_t)) {
    float16x8_t vx0 = vreinterpretq_f16_u16(vld1q_u16(i)); i += 8;
    float16x8_t vx1 = vreinterpretq_f16_u16(vld1q_u16(i)); i += 8;

    float16x8_t vz0 = vmulq_f16(vx0, vprescale);
    float16x8_t vz1 = vmulq_f16(vx1, vprescale);

    vz0 = vmaxq_f16(vz0, vsat_cutoff);
    vz1 = vmaxq_f16(vz1, vsat_cutoff);

    float16x8_t vn0 = vfmaq_f16(vmagic_bias, vz0, vlog2e);
    float16x8_t vn1 = vfmaq_f16(vmagic_bias, vz1, vlog2e);

    float16x8_t vs0 = vreinterpretq_f16_s16(vshlq_n_s16(vreinterpretq_s16_f16(vn0), 10));
    vn0 = vsubq_f16(vn0, vmagic_bias);
    float16x8_t vs1 = vreinterpretq_f16_s16(vshlq_n_s16(vreinterpretq_s16_f16(vn1), 10));
    vn1 = vsubq_f16(vn1, vmagic_bias);

    float16x8_t vt0 = vfmaq_f16(vz0, vn0, vminus_ln2);
    float16x8_t vt1 = vfmaq_f16(vz1, vn1, vminus_ln2);

    float16x8_t vp0 = vfmaq_f16(vc2, vc3, vt0);
    vp0 = vmulq_f16(vp0, vt0);
    float16x8_t vp1 = vfmaq_f16(vc2, vc3, vt1);
    vp1 = vmulq_f16(vp1, vt1);

    vt0 = vmulq_f16(vt0, vs0);
    vs0 = vfmsq_f16(vminus_alpha, vs0, vminus_alpha);
    vt1 = vmulq_f16(vt1, vs1);
    vs1 = vfmsq_f16(vminus_alpha, vs1, vminus_alpha);

    vp0 = vfmaq_f16(vt0, vp0, vt0);
    vp1 = vfmaq_f16(vt1, vp1, vt1);

    float16x8_t ve0 = vfmsq_f16(vs0, vp0, vminus_alpha);
    const uint16x8_t vm0 = vcltq_s16(vreinterpretq_s16_f16(vx0), vmovq_n_s16(0));
    float16x8_t ve1 = vfmsq_f16(vs1, vp1, vminus_alpha);
    const uint16x8_t vm1 = vcltq_s16(vreinterpretq_s16_f16(vx1), vmovq_n_s16(0));

    vx0 = vmulq_f16(vx0, vbeta);
    vx1 = vmulq_f16(vx1, vbeta);

    const float16x8_t vy0 = vbslq_f16(vm0, ve0, vx0);
    const float16x8_t vy1 = vbslq_f16(vm1, ve1, vx1);

    vst1q_u16(o, vreinterpretq_u16_f16(vy0)); o += 8;
    vst1q_u16(o, vreinterpretq_u16_f16(vy1)); o += 8;
  }
  for (; batch >= 8 * sizeof(uint16_t); batch -= 8 * sizeof(uint16_t)) {
    float16x8_t vx = vreinterpretq_f16_u16(vld1q_u16(i)); i += 8;
    float16x8_t vz = vmulq_f16(vx, vprescale);
    vz = vmaxq_f16(vz, vsat_cutoff);

    float16x8_t vn = vfmaq_f16(vmagic_bias, vz, vlog2e);
    float16x8_t vs = vreinterpretq_f16_s16(vshlq_n_s16(vreinterpretq_s16_f16(vn), 10));
    vn = vsubq_f16(vn, vmagic_bias);
    float16x8_t vt = vfmaq_f16(vz, vn, vminus_ln2);

    float16x8_t vp = vfmaq_f16(vc2, vc3, vt);
    vp = vmulq_f16(vp, vt);
    vt = vmulq_f16(vt, vs);
    vs = vfmsq_f16(vminus_alpha, vs, vminus_alpha);
    vp = vfmaq_f16(vt, vp, vt);
    float16x8_t ve = vfmsq_f16(vs, vp, vminus_alpha);

    const uint16x8_t vm = vcltq_s16(vreinterpretq_s16_f16(vx), vmovq_n_s16(0));
    vx = vmulq_f16(vx, vbeta);
    const float16x8_t vy = vbslq_f16(vm, ve, vx);
    vst1q_u16(o, vreinterpretq_u16_f16(vy)); o += 8;
  }
  if XNN_UNLIKELY(batch != 0) {
    float16x8_t vx = vreinterpretq_f16_u16(vld1q_u16(i)); i += 8;
    float16x8_t vz = vmulq_f16(vx, vprescale);
    vz = vmaxq_f16(vz, vsat_cutoff);

    float16x8_t vn = vfmaq_f16(vmagic_bias, vz, vlog2e);
    float16x8_t vs = vreinterpretq_f16_s16(vshlq_n_s16(vreinterpretq_s16_f16(vn), 10));
    vn = vsubq_f16(vn, vmagic_bias);
    float16x8_t vt = vfmaq_f16(vz, vn, vminus_ln2);

    float16x8_t vp = vfmaq_f16(vc2, vc3, vt);
    vp = vmulq_f16(vp, vt);
    vt = vmulq_f16(vt, vs);
    vs = vfmsq_f16(vminus_alpha, vs, vminus_alpha);
    vp = vfmaq_f16(vt, vp, vt);
    float16x8_t ve = vfmsq_f16(vs, vp, vminus_alpha);

    const uint16x8_t vm = vcltq_s16(vreinterpretq_s16_f16(vx), vmovq_n_s16(0));
    vx = vmulq_f16(vx, vbeta);
    float16x8_t vy = vbslq_f16(vm, ve, vx);
    float16x4_t vy_lo = vget_low_f16(vy);
    if (batch & (4 * sizeof(uint16_t))) {
      vst1_u16(o, vreinterpret_u16_f16(vy_lo)); o += 4;
      vy_lo = vget_high_f16(vy);
    }
    if (batch & (2 * sizeof(uint16_t))) {
      vst1_lane_u32((void*) o, vreinterpret_u32_f16(vy_lo), 0); o += 2;
      vy_lo = vext_f16(vy_lo, vy_lo, 2);
    }
    if (batch & (1 * sizeof(uint16_t))) {
      vst1_lane_u16(o, vreinterpret_u16_f16(vy_lo), 0);
    }
  }
}