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Vectorize audio downsampling. #2

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Vectorize audio downsampling. #2

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43 changes: 41 additions & 2 deletions src/filterkit.c
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,10 @@

#include "filterkit.h"

#ifdef __SSE4_1__
#include <xmmintrin.h>
#endif

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
Expand Down Expand Up @@ -202,14 +206,49 @@ float lrsFilterUD(float Imp[], /* impulse response */
Ho += dhb; /* IR step */
Xp += Inc; /* Input signal step. NO CHECK ON BOUNDS */
}
else
else {
#ifdef __SSE4_1__
__m128i vv = _mm_set1_ps(0.0f);
if (Inc == 1) {
while ((Hp = &Imp[(int)(Ho + 4*dhb)]) < End) {
/* Get IR sample */
__m128i vt = _mm_set_ps(Imp[(int)(Ho + 3 * dhb)],
Imp[(int)(Ho + 2*dhb)],
Imp[(int)(Ho + dhb)],
Imp[(int)(Ho)]);
vt = _mm_mul_ps(vt, _mm_loadu_ps(Xp));/* Mult coeff by input
sample */
vv = _mm_add_ps(vv, vt); /* The filter output */
Ho += 4*dhb; /* IR step */
Xp += 4; /* Input signal step. NO CHECK ON BOUNDS */
}
} else {
while ((Hp = &Imp[(int)(Ho + 4*dhb)]) < End) {
/* Get IR sample */
__m128i vt = _mm_set_ps(Imp[(int)(Ho)],
Imp[(int)(Ho + dhb)],
Imp[(int)(Ho + 2*dhb)],
Imp[(int)(Ho + 3*dhb)]);
vt = _mm_mul_ps(vt, _mm_loadu_ps(Xp - 3)); /* Mult coeff by input
sample */
vv = _mm_add_ps(vv, vt); /* The filter output */
Ho += 4*dhb; /* IR step */
Xp -= 4; /* Input signal step. NO CHECK ON BOUNDS */
}
}
float elems[4];
memcpy(elems, &vv, sizeof(vv));
v = elems[0] + elems[1] + elems[2] + elems[3];
// Fallthrough intended: the rest of the loop is done in a non-vectorized
// way.
#endif
while ((Hp = &Imp[(int)Ho]) < End) {
t = *Hp; /* Get IR sample */
t *= *Xp; /* Mult coeff by input sample */
v += t; /* The filter output */
Ho += dhb; /* IR step */
Xp += Inc; /* Input signal step. NO CHECK ON BOUNDS */
}

}
return v;
}