xref: /aosp_15_r20/external/XNNPACK/src/f32-f16-vcvt/gen/vcvt-scalar-fabsf-x2.c (revision 4bdc94577ba0e567308109d787f7fec7b531ce36)

// Auto-generated file. Do not edit!
//   Template: src/f32-f16-vcvt/scalar-fabsf.c.in
//   Generator: tools/xngen
//
// Copyright 2021 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 <math.h>

#include <xnnpack/common.h>
#include <xnnpack/math.h>
#include <xnnpack/vcvt.h>


void xnn_f32_f16_vcvt_ukernel__scalar_fabsf_x2(
    size_t n,
    const float* input,
    void* output,
    const union xnn_f32_f16_cvt_params params[restrict XNN_MIN_ELEMENTS(1)])
{
  assert(n != 0);
  assert(n % sizeof(float) == 0);
  assert(input != NULL);
  assert(output != NULL);

  const float vscale_to_inf = params->scalar_fabsf.scale_to_inf;
  const uint32_t vexp_bias = params->scalar_fabsf.exp_bias;
  const float vscale_to_zero = params->scalar_fabsf.scale_to_zero;
  const uint32_t vexpw_max = params->scalar_fabsf.expw_max;
  const uint32_t vbias_min = params->scalar_fabsf.bias_min;
  const uint16_t vexph_mask = params->scalar_fabsf.exph_mask;
  const uint16_t vmanth_mask = params->scalar_fabsf.manth_mask;
  const uint16_t vnanh = params->scalar_fabsf.nanh;

  uint16_t* o = (uint16_t*) output;
  for (; n >= 2 * sizeof(float); n -= 2 * sizeof(float)) {
    const float vx0 = input[0];
    const float vx1 = input[1];
    input += 2;

    const float vabsx0 = fabsf(vx0);
    const float vabsx1 = fabsf(vx1);
    uint32_t vsignw0 = float_as_uint32(vx0);
    uint32_t vsignw1 = float_as_uint32(vx1);

    const uint32_t vnonsignw0 = float_as_uint32(vabsx0);
    const uint32_t vnonsignw1 = float_as_uint32(vabsx1);
    float vf0 = vabsx0 * vscale_to_inf;
    float vf1 = vabsx1 * vscale_to_inf;

    uint32_t vbias0 = vnonsignw0 + vexp_bias;
    uint32_t vbias1 = vnonsignw1 + vexp_bias;
    vsignw0 ^= vnonsignw0;
    vsignw1 ^= vnonsignw1;

    vf0 *= vscale_to_zero;
    vf1 *= vscale_to_zero;
    vbias0 &= vexpw_max;
    vbias1 &= vexpw_max;

    vbias0 = math_max_u32(vbias0, vbias_min);
    vbias1 = math_max_u32(vbias1, vbias_min);

    vf0 += uint32_as_float(vbias0);
    vf1 += uint32_as_float(vbias1);

    const uint32_t vbits0 = float_as_uint32(vf0);
    const uint32_t vbits1 = float_as_uint32(vf1);

    const uint16_t vexph0 = (uint16_t) (vbits0 >> 13) & vexph_mask;
    const uint16_t vexph1 = (uint16_t) (vbits1 >> 13) & vexph_mask;
    const uint16_t vmanth0 = (uint16_t) vbits0 & vmanth_mask;
    const uint16_t vmanth1 = (uint16_t) vbits1 & vmanth_mask;
    const uint16_t vsignh0 = (uint16_t) (vsignw0 >> 16);
    const uint16_t vsignh1 = (uint16_t) (vsignw1 >> 16);

    uint16_t vh0 = vexph0 + vmanth0;
    uint16_t vh1 = vexph1 + vmanth1;
    if XNN_UNPREDICTABLE(vnonsignw0 > vexpw_max) {
      vh0 = vnanh;
    }
    if XNN_UNPREDICTABLE(vnonsignw1 > vexpw_max) {
      vh1 = vnanh;
    }
    vh0 |= vsignh0;
    vh1 |= vsignh1;

    o[0] = vh0;
    o[1] = vh1;
    o += 2;
  }
  if XNN_UNLIKELY(n != 0) {
    const float vx = *input;

    const float vabsx = fabsf(vx);
    uint32_t vsignw = float_as_uint32(vx);

    const uint32_t vnonsignw = float_as_uint32(vabsx);
    float vf = vabsx * vscale_to_inf;

    uint32_t vbias = vnonsignw + vexp_bias;
    vsignw ^= vnonsignw;

    vf *= vscale_to_zero;
    vbias &= vexpw_max;

    vbias = math_max_u32(vbias, vbias_min);

    vf += uint32_as_float(vbias);

    const uint32_t vbits = float_as_uint32(vf);

    const uint16_t vexph = (uint16_t) (vbits >> 13) & vexph_mask;
    const uint16_t vmanth = (uint16_t) vbits & vmanth_mask;
    const uint16_t vsignh = (uint16_t) (vsignw >> 16);

    uint16_t vh = vexph + vmanth;
    if XNN_UNPREDICTABLE(vnonsignw > vexpw_max) {
      vh = vnanh;
    }
    vh |= vsignh;

    *o = vh;
  }
}