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/* Copyright (C) 2010-2021 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (float_to_s16.c).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdint.h>
#include <stddef.h>
#if defined(__SSE2__)
#include <emmintrin.h>
#elif defined(__ALTIVEC__)
#include <altivec.h>
#endif
#include <features/features_cpu.h>
#include <audio/conversion/float_to_s16.h>
#if (defined(__ARM_NEON__) || defined(HAVE_NEON))
static bool float_to_s16_neon_enabled = false;
#ifdef HAVE_ARM_NEON_ASM_OPTIMIZATIONS
void convert_float_s16_asm(int16_t *out,
const float *in, size_t samples);
#else
#include <arm_neon.h>
#endif
void convert_float_to_s16(int16_t *out,
const float *in, size_t samples)
{
size_t i = 0;
if (float_to_s16_neon_enabled)
{
float gf = (1<<15);
float32x4_t vgf = {gf, gf, gf, gf};
while (samples >= 8)
{
#ifdef HAVE_ARM_NEON_ASM_OPTIMIZATIONS
size_t aligned_samples = samples & ~7;
if (aligned_samples)
convert_float_s16_asm(out, in, aligned_samples);
out += aligned_samples;
in += aligned_samples;
samples -= aligned_samples;
i = 0;
#else
int16x4x2_t oreg;
int32x4x2_t creg;
float32x4x2_t inreg = vld2q_f32(in);
creg.val[0] = vcvtq_s32_f32(vmulq_f32(inreg.val[0], vgf));
creg.val[1] = vcvtq_s32_f32(vmulq_f32(inreg.val[1], vgf));
oreg.val[0] = vqmovn_s32(creg.val[0]);
oreg.val[1] = vqmovn_s32(creg.val[1]);
vst2_s16(out, oreg);
in += 8;
out += 8;
samples -= 8;
#endif
}
}
for (; i < samples; i++)
{
int32_t val = (int32_t)(in[i] * 0x8000);
out[i] = (val > 0x7FFF) ? 0x7FFF :
(val < -0x8000 ? -0x8000 : (int16_t)val);
}
}
void convert_float_to_s16_init_simd(void)
{
uint64_t cpu = cpu_features_get();
if (cpu & RETRO_SIMD_NEON)
float_to_s16_neon_enabled = true;
}
#else
void convert_float_to_s16(int16_t *out,
const float *in, size_t samples)
{
size_t i = 0;
#if defined(__SSE2__)
__m128 factor = _mm_set1_ps((float)0x8000);
/* Initialize a 4D vector with 32768.0 for its elements */
for (i = 0; i + 8 <= samples; i += 8, in += 8, out += 8)
{ /* Skip forward 8 samples at a time... */
__m128 input_a = _mm_loadu_ps(in + 0); /* Create a 4-float vector from the next four samples... */
__m128 input_b = _mm_loadu_ps(in + 4); /* ...and another from the *next* next four. */
__m128 res_a = _mm_mul_ps(input_a, factor);
__m128 res_b = _mm_mul_ps(input_b, factor); /* Multiply these samples by 32768 */
__m128i ints_a = _mm_cvtps_epi32(res_a);
__m128i ints_b = _mm_cvtps_epi32(res_b); /* Convert the samples to 32-bit integers */
__m128i packed = _mm_packs_epi32(ints_a, ints_b); /* Then convert them to 16-bit ints, clamping to [-32768, 32767] */
_mm_storeu_si128((__m128i *)out, packed); /* Then put the result in the output array */
}
samples = samples - i;
i = 0;
/* If there are any stray samples at the end, we need to convert them
* (maybe the original array didn't contain a multiple of 8 samples) */
#elif defined(__ALTIVEC__)
int samples_in = samples;
/* Unaligned loads/store is a bit expensive,
* so we optimize for the good path (very likely). */
if (((uintptr_t)out & 15) + ((uintptr_t)in & 15) == 0)
{
size_t i;
for (i = 0; i + 8 <= samples; i += 8, in += 8, out += 8)
{
vector float input0 = vec_ld( 0, in);
vector float input1 = vec_ld(16, in);
vector signed int result0 = vec_cts(input0, 15);
vector signed int result1 = vec_cts(input1, 15);
vec_st(vec_packs(result0, result1), 0, out);
}
samples_in -= i;
}
samples = samples_in;
i = 0;
#elif defined(_MIPS_ARCH_ALLEGREX)
#ifdef DEBUG
/* Make sure the buffers are 16 byte aligned, this should be
* the default behaviour of malloc in the PSPSDK.
* Assume alignment. */
retro_assert(((uintptr_t)in & 0xf) == 0);
retro_assert(((uintptr_t)out & 0xf) == 0);
#endif
for (i = 0; i + 8 <= samples; i += 8)
{
__asm__ (
".set push \n"
".set noreorder \n"
"lv.q c100, 0(%0) \n"
"lv.q c110, 16(%0) \n"
"vf2in.q c100, c100, 31 \n"
"vf2in.q c110, c110, 31 \n"
"vi2s.q c100, c100 \n"
"vi2s.q c102, c110 \n"
"sv.q c100, 0(%1) \n"
".set pop \n"
:: "r"(in + i), "r"(out + i));
}
#endif
/* This loop converts stray samples to the right format,
* but it's also a fallback in case no SIMD instructions are available. */
for (; i < samples; i++)
{
int32_t val = (int32_t)(in[i] * 0x8000);
out[i] = (val > 0x7FFF)
? 0x7FFF
: (val < -0x8000 ? -0x8000 : (int16_t)val);
}
}
void convert_float_to_s16_init_simd(void) { }
#endif
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