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fmt-ops: add optimized f32 to s16 stereo conversion

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This commit is contained in:
Wim Taymans 2020-03-16 13:04:21 +01:00
parent 0548fbf690
commit fd3dd14ebe
3 changed files with 54 additions and 0 deletions
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52
spa/plugins/audioconvert/fmt-ops-sse2.c
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@ -723,3 +723,55 @@ conv_f32d_to_s16_sse2(struct convert *conv, void * SPA_RESTRICT dst[], const voi
for(; i < n_channels; i++)
conv_f32d_to_s16_1s_sse2(conv, &d[i], &src[i], n_channels, n_samples);
}
void
conv_f32d_to_s16_2_sse2(struct convert *conv, void * SPA_RESTRICT dst[], const void * SPA_RESTRICT src[],
uint32_t n_samples)
{
const float *s0 = src[0], *s1 = src[1];
int16_t *d = dst[0];
uint32_t n, unrolled;
__m128 in[4];
__m128i out[4];
__m128 int_max = _mm_set1_ps(S16_MAX_F);
__m128 int_min = _mm_sub_ps(_mm_setzero_ps(), int_max);
if (SPA_IS_ALIGNED(s0, 16) &&
SPA_IS_ALIGNED(s1, 16))
unrolled = n_samples & ~7;
else
unrolled = 0;
for(n = 0; n < unrolled; n += 8) {
in[0] = _mm_mul_ps(_mm_load_ps(&s0[n+0]), int_max);
in[1] = _mm_mul_ps(_mm_load_ps(&s1[n+0]), int_max);
in[2] = _mm_mul_ps(_mm_load_ps(&s0[n+4]), int_max);
in[3] = _mm_mul_ps(_mm_load_ps(&s1[n+4]), int_max);
out[0] = _mm_cvtps_epi32(in[0]);
out[1] = _mm_cvtps_epi32(in[1]);
out[2] = _mm_cvtps_epi32(in[2]);
out[3] = _mm_cvtps_epi32(in[3]);
out[0] = _mm_packs_epi32(out[0], out[2]);
out[1] = _mm_packs_epi32(out[1], out[3]);
out[2] = _mm_unpacklo_epi16(out[0], out[1]);
out[3] = _mm_unpackhi_epi16(out[0], out[1]);
_mm_storeu_si128((__m128i*)(d+0), out[2]);
_mm_storeu_si128((__m128i*)(d+8), out[3]);
d += 16;
}
for(; n < n_samples; n++) {
in[0] = _mm_mul_ss(_mm_load_ss(&s0[n]), int_max);
in[1] = _mm_mul_ss(_mm_load_ss(&s1[n]), int_max);
in[0] = _mm_min_ss(int_max, _mm_max_ss(in[0], int_min));
in[1] = _mm_min_ss(int_max, _mm_max_ss(in[1], int_min));
d[0] = _mm_cvtss_si32(in[0]);
d[1] = _mm_cvtss_si32(in[1]);
d += 2;
}
}