mirror of
https://github.com/libretro/RetroArch.git
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135 lines
4.1 KiB
C
135 lines
4.1 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2012 - Hans-Kristian Arntzen
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with SSNES.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "utils.h"
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#if __SSE2__
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#include <emmintrin.h>
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#elif __ALTIVEC__
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#include <altivec.h>
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#endif
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void audio_convert_s16_to_float_C(float *out,
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const int16_t *in, size_t samples)
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{
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for (size_t i = 0; i < samples; i++)
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out[i] = (float)in[i] / 0x8000;
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}
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void audio_convert_float_to_s16_C(int16_t *out,
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const float *in, size_t samples)
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{
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for (size_t i = 0; i < samples; i++)
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{
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int32_t val = (int32_t)(in[i] * 0x8000);
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out[i] = (val > 0x7FFF) ? 0x7FFF : (val < -0x8000 ? -0x8000 : (int16_t)val);
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}
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}
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#if __SSE2__
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void audio_convert_s16_to_float_SSE2(float *out,
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const int16_t *in, size_t samples)
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{
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__m128 factor = _mm_set1_ps(1.0f / (0x7fff * 0x10000));
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size_t i;
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for (i = 0; i + 8 <= samples; i += 8, in += 8, out += 8)
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{
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__m128i input = _mm_loadu_si128((const __m128i *)in);
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__m128i regs[2] = {
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_mm_unpacklo_epi16(_mm_setzero_si128(), input),
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_mm_unpackhi_epi16(_mm_setzero_si128(), input),
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};
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__m128 output[2] = {
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_mm_mul_ps(_mm_cvtepi32_ps(regs[0]), factor),
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_mm_mul_ps(_mm_cvtepi32_ps(regs[1]), factor),
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};
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_mm_storeu_ps(out + 0, output[0]);
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_mm_storeu_ps(out + 4, output[1]);
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}
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audio_convert_s16_to_float_C(out, in, samples - i);
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}
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void audio_convert_float_to_s16_SSE2(int16_t *out,
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const float *in, size_t samples)
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{
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__m128 factor = _mm_set1_ps((float)0x7fff);
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size_t i;
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for (i = 0; i + 8 <= samples; i += 8, in += 8, out += 8)
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{
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__m128 input[2] = { _mm_loadu_ps(in + 0), _mm_loadu_ps(in + 4) };
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__m128 res[2] = { _mm_mul_ps(input[0], factor), _mm_mul_ps(input[1], factor) };
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__m128i ints[2] = { _mm_cvtps_epi32(res[0]), _mm_cvtps_epi32(res[1]) };
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__m128i packed = _mm_packs_epi32(ints[0], ints[1]);
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_mm_storeu_si128((__m128i *)out, packed);
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}
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audio_convert_float_to_s16_C(out, in, samples - i);
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}
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#elif __ALTIVEC__
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void audio_convert_s16_to_float_altivec(float *out,
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const int16_t *in, size_t samples)
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{
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// Unaligned loads/store is a bit expensive, so we optimize for the good path (very likely).
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if (((uintptr_t)out & 15) + ((uintptr_t)in & 15) == 0)
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{
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size_t i;
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for (i = 0; i + 8 <= samples; i += 8, in += 8, out += 8)
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{
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vector signed short input = vec_ld(0, in);
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vector signed int hi = vec_unpackh(input);
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vector signed int lo = vec_unpackl(input);
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vector float out_hi = vec_ctf(hi, 15);
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vector float out_lo = vec_ctf(lo, 15);
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vec_st(out_hi, 0, out);
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vec_st(out_lo, 16, out);
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}
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audio_convert_s16_to_float_C(out, in, samples - i);
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}
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else
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audio_convert_s16_to_float_C(out, in, samples);
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}
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void audio_convert_float_to_s16_altivec(int16_t *out,
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const float *in, size_t samples)
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{
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// Unaligned loads/store is a bit expensive, so we optimize for the good path (very likely).
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if (((uintptr_t)out & 15) + ((uintptr_t)in & 15) == 0)
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{
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size_t i;
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for (i = 0; i + 8 <= samples; i += 8, in += 8, out += 8)
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{
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vector float input0 = vec_ld( 0, in);
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vector float input1 = vec_ld(16, in);
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vector signed int result0 = vec_cts(input0, 15);
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vector signed int result1 = vec_cts(input1, 15);
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vec_st(vec_packs(result0, result1), 0, out);
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}
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audio_convert_float_to_s16_C(out, in, samples - i);
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}
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else
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audio_convert_float_to_s16_C(out, in, samples);
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}
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#endif
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