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Fix overread in altivec DSP function sad16

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Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Vitor Sessak 2011-01-29 14:14:32 +00:00 committed by Mans Rullgard
parent ce20edb7bd
commit 3af1fe829e
1 changed files with 7 additions and 5 deletions
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12
libavcodec/ppc/dsputil_altivec.c
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@ -230,7 +230,7 @@ static int sad16_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, i
int i;
int s;
const vector unsigned int zero = (const vector unsigned int)vec_splat_u32(0);
vector unsigned char perm1, perm2, *pix1v, *pix2v;
vector unsigned char perm1, perm2, pix1v_low, pix1v_high, pix2v_low, pix2v_high;
vector unsigned char t1, t2, t3,t4, t5;
vector unsigned int sad;
vector signed int sumdiffs;
@ -241,11 +241,13 @@ static int sad16_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, i
for (i = 0; i < h; i++) {
/* Read potentially unaligned pixels into t1 and t2 */
perm1 = vec_lvsl(0, pix1);
pix1v = (vector unsigned char *) pix1;
pix1v_high = vec_ld( 0, pix1);
pix1v_low = vec_ld(15, pix1);
perm2 = vec_lvsl(0, pix2);
pix2v = (vector unsigned char *) pix2;
t1 = vec_perm(pix1v[0], pix1v[1], perm1);
t2 = vec_perm(pix2v[0], pix2v[1], perm2);
pix2v_high = vec_ld( 0, pix2);
pix2v_low = vec_ld(15, pix2);
t1 = vec_perm(pix1v_high, pix1v_low, perm1);
t2 = vec_perm(pix2v_high, pix2v_low, perm2);
/* Calculate a sum of abs differences vector */
t3 = vec_max(t1, t2);