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svolume: fix MMX error

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We need to sign extend the lower part of the multiplication before adding it to
the higher part. Makes -1 * 0xffff work again.
This commit is contained in:
Wim Taymans 2009-10-29 14:49:52 +01:00 • committed by Lennart Poettering
parent 8a49514f74
commit 056930cbcd
1 changed files with 6 additions and 1 deletions
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7
src/pulsecore/svolume_mmx.c
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@ -62,7 +62,9 @@
" movq "#s", %%mm5 \n\t" \
" pmulhw "#v", "#s" \n\t" /* .. | 0 | vl*p0 | */ \
" paddw %%mm4, "#s" \n\t" /* .. | 0 | vl*p0 | + sign correct */ \
" pslld $16, "#s" \n\t" /* .. | vl*p0 | 0 | */ \
" psrld $16, "#v" \n\t" /* .. | 0 | vh | */ \
" psrad $16, "#s" \n\t" /* .. | vl*p0 | sign extend */ \
" pmaddwd %%mm5, "#v" \n\t" /* .. | p0 * vh | */ \
" paddd "#s", "#v" \n\t" /* .. | p0 * v0 | */ \
" packssdw "#v", "#v" \n\t" /* .. | p1*v1 | p0*v0 | */
@ -257,11 +259,14 @@ static void run_test (void) {
printf ("checking MMX %zd\n", sizeof (samples));
pa_random (samples, sizeof (samples));
/* for (i = 0; i < SAMPLES; i++)
samples[i] = -1; */
memcpy (samples_ref, samples, sizeof (samples));
memcpy (samples_orig, samples, sizeof (samples));
for (i = 0; i < CHANNELS; i++)
volumes[i] = rand() >> 1;
/* volumes[i] = 0x0000ffff; */
for (padding = 0; padding < PADDING; padding++, i++)
volumes[i] = volumes[padding];
@ -269,7 +274,7 @@ static void run_test (void) {
pa_volume_s16ne_mmx (samples, volumes, CHANNELS, sizeof (samples));
for (i = 0; i < SAMPLES; i++) {
if (samples[i] != samples_ref[i]) {
printf ("%d: %04x != %04x (%04x * %04x)\n", i, samples[i], samples_ref[i],
printf ("%d: %04x != %04x (%04x * %08x)\n", i, samples[i], samples_ref[i],
samples_orig[i], volumes[i % CHANNELS]);
}
}