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SSE2 optimized a bit :D

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This commit is contained in:
Themaister 2011-10-15 18:09:44 +02:00
parent 5bcf601a40
commit d7b3f39136
1 changed files with 61 additions and 2 deletions
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63
audio/utils.h
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@ -3,14 +3,23 @@
#include <stdint.h>
static inline void audio_convert_s16_to_float(float *out,
#ifdef __SSE2__
#include <emmintrin.h>
#define audio_convert_s16_to_float audio_convert_s16_to_float_SSE2
#define audio_convert_float_to_s16 audio_convert_float_to_s16_SSE2
#else
#define audio_convert_s16_to_float audio_convert_s16_to_float_C
#define audio_convert_float_to_s16 audio_convert_float_to_s16_C
#endif
static inline void audio_convert_s16_to_float_C(float *out,
const int16_t *in, unsigned samples)
{
for (unsigned i = 0; i < samples; i++)
out[i] = (float)in[i] / 0x8000;
}
static inline void audio_convert_float_to_s16(int16_t *out,
static inline void audio_convert_float_to_s16_C(int16_t *out,
const float *in, unsigned samples)
{
for (unsigned i = 0; i < samples; i++)
@ -20,5 +29,55 @@ static inline void audio_convert_float_to_s16(int16_t *out,
}
}
#ifdef __SSE2__
static inline void audio_convert_s16_to_float_SSE2(float *out,
const int16_t *in, unsigned samples)
{
// Not aligned? FML :(
if (((uintptr_t)in & 7) || ((uintptr_t)out & 15))
{
audio_convert_s16_to_float_C(out, in, samples);
return;
}
__m128 factor = _mm_set1_ps(1.0f / 0x7fff);
unsigned i;
for (i = 0; i + 4 <= samples; i += 4, in += 4, out += 4)
{
__m64 input = *(const __m64*)in;
__m128 reg = _mm_cvtpi16_ps(input);
__m128 res = _mm_mul_ps(reg, factor);
*(__m128*)out = res;
}
audio_convert_s16_to_float_C(out, in, samples - i);
}
static inline void audio_convert_float_to_s16_SSE2(int16_t *out,
const float *in, unsigned samples)
{
// Not aligned? FML :(
if (((uintptr_t)in & 7) || ((uintptr_t)out & 15))
{
audio_convert_float_to_s16_C(out, in, samples);
return;
}
__m128 factor = _mm_set1_ps(0x7fff);
unsigned i;
for (i = 0; i + 4 <= samples; i += 4, in += 4, out += 4)
{
__m128 input = *(const __m128*)in;
__m128 res = _mm_mul_ps(input, factor);
__m64 output = _mm_cvtps_pi16(res);
*(__m64*)out = output;
}
audio_convert_float_to_s16_C(out, in, samples - i);
}
#endif
#endif