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// Auto-generated file. Do not edit!
// Template: src/f16-vtanh/neonfp16arith-expm1minus.c.in
// Generator: tools/xngen
//
// Copyright 2023 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/microparams.h>
void xnn_f16_vtanh_ukernel__aarch64_neonfp16arith_expm1minus_rr1_p3h2ts_div_x8(
size_t n,
const void* input,
void* output,
const union xnn_f16_tanh_params params[restrict XNN_MIN_ELEMENTS(1)]) XNN_OOB_READS
{
assert(n != 0);
assert(n % sizeof(uint16_t) == 0);
assert(input != NULL);
assert(output != NULL);
const float16x8_t vsat_cutoff = vreinterpretq_f16_u16(vmovq_n_u16(UINT16_C(0x4482)));
const float16x8_t vmagic_bias = vreinterpretq_f16_u16(vmovq_n_u16(UINT16_C(0x620F)));
const float16x8_t vminus_log2e = vreinterpretq_f16_u16(vmovq_n_u16(UINT16_C(0xBDC5)));
const float16x8_t vln2 = vreinterpretq_f16_u16(vmovq_n_u16(UINT16_C(0x398C)));
const float16x8_t vc3 = vreinterpretq_f16_u16(vmovq_n_u16(UINT16_C(0xBD5B)));
const float16x8_t vc2 = vreinterpretq_f16_u16(vmovq_n_u16(UINT16_C(0x4008)));
const float16x8_t vtwo = vreinterpretq_f16_u16(vmovq_n_u16(UINT16_C(0x4000)));
const float16x8_t vminus_one = vreinterpretq_f16_u16(vmovq_n_u16(UINT16_C(0xBC00)));
const uint16x8_t vsign_mask = vmovq_n_u16(UINT16_C(0x8000));
const uint16_t* i = (const uint16_t*) input;
uint16_t* o = (uint16_t*) output;
for (; n >= 1 * sizeof(float16x8_t); n -= 1 * sizeof(float16x8_t)) {
const float16x8_t vx = vreinterpretq_f16_u16(vld1q_u16(i)); i += 8;
float16x8_t vz = vabsq_f16(vx);
vz = vminq_f16(vz, vsat_cutoff);
float16x8_t vn = vfmaq_f16(vmagic_bias, vz, vminus_log2e);
const float16x8_t vs = vreinterpretq_f16_s16(vshlq_n_s16(vreinterpretq_s16_f16(vn), 10));
vn = vsubq_f16(vn, vmagic_bias);
const float16x8_t vt = vfmaq_f16(vz, vn, vln2);
float16x8_t vp = vfmaq_f16(vc2, vc3, vt);
vp = vfmsq_f16(vtwo, vp, vt);
const float16x8_t vts = vmulq_f16(vt, vs);
const float16x8_t vsmo = vaddq_f16(vs, vminus_one);
const float16x8_t vemo = vfmsq_f16(vsmo, vp, vts);
const float16x8_t vepo = vaddq_f16(vemo, vtwo);
float16x8_t vy = vdivq_f16(vemo, vepo);
vy = vbslq_f16(vsign_mask, vx, vy);
vst1q_u16(o, vreinterpretq_u16_f16(vy)); o += 8;
}
if (n != 0) {
const float16x8_t vx = vreinterpretq_f16_u16(vld1q_u16(i)); i += 8;
float16x8_t vz = vabsq_f16(vx);
vz = vminq_f16(vz, vsat_cutoff);
float16x8_t vn = vfmaq_f16(vmagic_bias, vz, vminus_log2e);
const float16x8_t vs = vreinterpretq_f16_s16(vshlq_n_s16(vreinterpretq_s16_f16(vn), 10));
vn = vsubq_f16(vn, vmagic_bias);
const float16x8_t vt = vfmaq_f16(vz, vn, vln2);
float16x8_t vp = vfmaq_f16(vc2, vc3, vt);
vp = vfmsq_f16(vtwo, vp, vt);
const float16x8_t vts = vmulq_f16(vt, vs);
const float16x8_t vsmo = vaddq_f16(vs, vminus_one);
const float16x8_t vemo = vfmsq_f16(vsmo, vp, vts);
const float16x8_t vepo = vaddq_f16(vemo, vtwo);
float16x8_t vy = vdivq_f16(vemo, vepo);
vy = vbslq_f16(vsign_mask, vx, vy);
float16x4_t vy_lo = vget_low_f16(vy);
if (n & 4 * sizeof(uint16_t)) {
vst1_u16(o, vreinterpret_u16_f16(vy_lo)); o += 4;
vy_lo = vget_high_f16(vy);
}
if (n & 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 (n & 1 * sizeof(uint16_t)) {
vst1_lane_u16(o, vreinterpret_u16_f16(vy_lo), 0);
}
}
}
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