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lsws/ppc/yuv2rgb_altivec: Replace vec_lvsl/vec_perm with vec_xl 

gcc 6.x and 7.x generate wrong code for little endian machines
for the vec_lvsl/vec_perm instruction combos in some cases.
The bug was fixed in version 8.x
If these instructions are replaced with vec_xl, the problem goes
away for all versions of the compilers.

Fixes ticket #7124.
This commit is contained in:
Chip Kerchner 2019-08-13 02:21:24 +02:00 committed by Carl Eugen Hoyos
parent faa9cd312f
commit 3a557c5d88
1 changed files with 4 additions and 20 deletions
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24
libswscale/ppc/yuv2rgb_altivec.c
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@ -305,9 +305,6 @@ static int altivec_ ## name(SwsContext *c, const unsigned char **in, \
vector signed short R1, G1, B1; \
vector unsigned char R, G, B; \
\
const vector unsigned char *y1ivP, *y2ivP, *uivP, *vivP; \
vector unsigned char align_perm; \
\
vector signed short lCY = c->CY; \
vector signed short lOY = c->OY; \
vector signed short lCRV = c->CRV; \
@ -338,26 +335,13 @@ static int altivec_ ## name(SwsContext *c, const unsigned char **in, \
vec_dstst(oute, (0x02000002 | (((w * 3 + 32) / 32) << 16)), 1); \
\
for (j = 0; j < w / 16; j++) { \
y1ivP = (const vector unsigned char *) y1i; \
y2ivP = (const vector unsigned char *) y2i; \
uivP = (const vector unsigned char *) ui; \
vivP = (const vector unsigned char *) vi; \
y0 = vec_xl(0, y1i); \
\
align_perm = vec_lvsl(0, y1i); \
y0 = (vector unsigned char) \
vec_perm(y1ivP[0], y1ivP[1], align_perm); \
y1 = vec_xl(0, y2i); \
\
align_perm = vec_lvsl(0, y2i); \
y1 = (vector unsigned char) \
vec_perm(y2ivP[0], y2ivP[1], align_perm); \
u = (vector signed char) vec_xl(0, ui); \
\
align_perm = vec_lvsl(0, ui); \
u = (vector signed char) \
vec_perm(uivP[0], uivP[1], align_perm); \
\
align_perm = vec_lvsl(0, vi); \
v = (vector signed char) \
vec_perm(vivP[0], vivP[1], align_perm); \
v = (vector signed char) vec_xl(0, vi); \
\
u = (vector signed char) \
vec_sub(u, \