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some optimizations gcc should have done (10% faster loop filter)

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Originally committed as revision 4263 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-05-17 20:50:47 +00:00
parent ee408eadba
commit 6f7aa5891d
1 changed files with 10 additions and 13 deletions
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23
libavcodec/vp3.c
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@ -2248,15 +2248,13 @@ av_log(s->avctx, AV_LOG_ERROR, " help! got beefy vector! (%X, %X)\n", motion_x,
static void horizontal_filter(unsigned char *first_pixel, int stride,
int *bounding_values)
{
int i;
unsigned char *end;
int filter_value;
for (i = 0; i < 8; i++, first_pixel += stride) {
for (end= first_pixel + 8*stride; first_pixel < end; first_pixel += stride) {
filter_value =
(first_pixel[-2] * 1) -
(first_pixel[-1] * 3) +
(first_pixel[ 0] * 3) -
(first_pixel[ 1] * 1);
(first_pixel[-2] - first_pixel[ 1])
+3*(first_pixel[ 0] - first_pixel[-1]);
filter_value = bounding_values[(filter_value + 4) >> 3];
first_pixel[-1] = clip_uint8(first_pixel[-1] + filter_value);
first_pixel[ 0] = clip_uint8(first_pixel[ 0] - filter_value);
@ -2266,17 +2264,16 @@ static void horizontal_filter(unsigned char *first_pixel, int stride,
static void vertical_filter(unsigned char *first_pixel, int stride,
int *bounding_values)
{
int i;
unsigned char *end;
int filter_value;
const int nstride= -stride;
for (i = 0; i < 8; i++, first_pixel++) {
for (end= first_pixel + 8; first_pixel < end; first_pixel++) {
filter_value =
(first_pixel[-(2 * stride)] * 1) -
(first_pixel[-(1 * stride)] * 3) +
(first_pixel[ (0 )] * 3) -
(first_pixel[ (1 * stride)] * 1);
(first_pixel[2 * nstride] - first_pixel[ stride])
+3*(first_pixel[0 ] - first_pixel[nstride]);
filter_value = bounding_values[(filter_value + 4) >> 3];
first_pixel[-(1 * stride)] = clip_uint8(first_pixel[-(1 * stride)] + filter_value);
first_pixel[nstride] = clip_uint8(first_pixel[nstride] + filter_value);
first_pixel[0] = clip_uint8(first_pixel[0] - filter_value);
}
}