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Use shuffles/movehl.

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This commit is contained in:
Themaister 2012-02-25 21:47:40 +01:00
parent 3446774547
commit 37ed625bab
1 changed files with 20 additions and 22 deletions
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42
audio/sinc.c
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@ -35,10 +35,6 @@
#include <xmmintrin.h>
#endif
#if __SSE3__
#include <pmmintrin.h>
#endif
#define PHASE_BITS 8
#define SUBPHASE_BITS 16
@ -136,9 +132,7 @@ ssnes_resampler_t *resampler_new(void)
init_sinc_table(re);
#if __SSE3__
SSNES_LOG("Sinc resampler [SSE3]\n");
#elif __SSE__
#if __SSE__
SSNES_LOG("Sinc resampler [SSE]\n");
#else
SSNES_LOG("Sinc resampler [C]\n");
@ -177,22 +171,26 @@ static void process_sinc(ssnes_resampler_t *resamp, float *out_buffer)
sum_r = _mm_add_ps(sum_r, _mm_mul_ps(buf_r, sinc));
}
#if __SSE3__
__m128 res = _mm_hadd_ps(_mm_hadd_ps(sum_l, sum_r), _mm_setzero_ps());
_mm_storeu_ps(out_buffer, res); // Overwriting, but this is safe.
#else // Meh, compiler should optimize this to something sane.
union
{
float f[4];
__m128 v;
} u[2] = {
[0] = { .v = sum_l },
[1] = { .v = sum_r },
};
// Them annoying shuffles :V
// sum_l = { l3, l2, l1, l0 }
// sum_r = { r3, r2, r1, r0 }
out_buffer[0] = (u[0].f[0] + u[0].f[1]) + (u[0].f[2] + u[0].f[3]);
out_buffer[1] = (u[1].f[0] + u[1].f[1]) + (u[1].f[2] + u[1].f[3]);
#endif
__m128 sum = _mm_add_ps(_mm_shuffle_ps(sum_l, sum_r, _MM_SHUFFLE(1, 0, 1, 0)),
_mm_shuffle_ps(sum_l, sum_r, _MM_SHUFFLE(3, 2, 3, 2)));
// sum = { r1, r0, l1, l0 } + { r3, r2, l3, l2 }
// sum = { R1, R0, L1, L0 }
sum = _mm_add_ps(_mm_shuffle_ps(sum, sum, _MM_SHUFFLE(3, 3, 1, 1)), sum);
// sum = {R1, R1, L1, L1 } + { R1, R0, L1, L0 }
// sum = { X, R, X, L }
// Store L
_mm_store_ss(out_buffer + 0, sum);
// movehl { X, R, X, L } == { X, R, X, R }
_mm_store_ss(out_buffer + 1, _mm_movehl_ps(sum, sum));
}
#else // Plain ol' C99
static void process_sinc(ssnes_resampler_t *resamp, float *out_buffer)