62 lines
2.4 KiB
C
62 lines
2.4 KiB
C
// 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 <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include <smmintrin.h>
|
|
|
|
#include <xnnpack/math-stubs.h>
|
|
|
|
|
|
void xnn_math_f16_f32_cvt__sse41_int32(
|
|
size_t n,
|
|
const void* input,
|
|
float* output)
|
|
{
|
|
assert(n % (8 * sizeof(float)) == 0);
|
|
|
|
const __m128i vsign_mask = _mm_set1_epi32(0x80000000);
|
|
const __m128i vexp_offset = _mm_set1_epi32(0x70000000);
|
|
const __m128 vexp_scale = _mm_set1_ps(0x1.0p-112f);
|
|
const __m128i vmagic_mask = _mm_set1_epi32(0x3F000000);
|
|
const __m128 vmagic_bias = _mm_set1_ps(0.5f);
|
|
const __m128i vdenorm_cutoff = _mm_set1_epi32(0x04000000);
|
|
|
|
const uint16_t* i = (const uint16_t*) input;
|
|
for (; n != 0; n -= 8 * sizeof(float)) {
|
|
const __m128i vh = _mm_loadu_si128((const __m128i*) i);
|
|
i += 8;
|
|
|
|
const __m128i vw_lo = _mm_unpacklo_epi16(_mm_setzero_si128(), vh);
|
|
const __m128i vw_hi = _mm_unpackhi_epi16(_mm_setzero_si128(), vh);
|
|
|
|
const __m128i vsign_lo = _mm_and_si128(vw_lo, vsign_mask);
|
|
const __m128i vsign_hi = _mm_and_si128(vw_hi, vsign_mask);
|
|
|
|
const __m128i vnonsign_lo = _mm_xor_si128(vw_lo, vsign_lo);
|
|
const __m128i vnonsign_hi = _mm_xor_si128(vw_hi, vsign_hi);
|
|
|
|
const __m128i vnorm_lo = _mm_castps_si128(_mm_mul_ps(_mm_castsi128_ps(_mm_add_epi32(_mm_srli_epi32(vnonsign_lo, 3), vexp_offset)), vexp_scale));
|
|
const __m128i vnorm_hi = _mm_castps_si128(_mm_mul_ps(_mm_castsi128_ps(_mm_add_epi32(_mm_srli_epi32(vnonsign_hi, 3), vexp_offset)), vexp_scale));
|
|
|
|
const __m128i vdenorm_lo = _mm_castps_si128(_mm_sub_ps(_mm_castsi128_ps(_mm_or_si128(_mm_srli_epi32(vnonsign_lo, 16), vmagic_mask)), vmagic_bias));
|
|
const __m128i vdenorm_hi = _mm_castps_si128(_mm_sub_ps(_mm_castsi128_ps(_mm_or_si128(_mm_srli_epi32(vnonsign_hi, 16), vmagic_mask)), vmagic_bias));
|
|
|
|
const __m128i vmask_lo = _mm_cmpgt_epi32(vnonsign_lo, vdenorm_cutoff);
|
|
const __m128i vmask_hi = _mm_cmpgt_epi32(vnonsign_hi, vdenorm_cutoff);
|
|
|
|
const __m128i vf_lo = _mm_or_si128(vsign_lo,
|
|
_mm_blendv_epi8(vdenorm_lo, vnorm_lo, vmask_lo));
|
|
const __m128i vf_hi = _mm_or_si128(vsign_hi,
|
|
_mm_blendv_epi8(vdenorm_hi, vnorm_hi, vmask_hi));
|
|
|
|
_mm_storeu_ps(output, _mm_castsi128_ps(vf_lo));
|
|
_mm_storeu_ps(output + 4, _mm_castsi128_ps(vf_hi));
|
|
output += 8;
|
|
}
|
|
}
|