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avcodec/vc1dsp: Avoid negating unnecessarily

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Due to the earlier "if (a1 < a0 || a2 < a0)" check
it is guaranteed that min(a1,a2) is < a0, allowing
simplifications.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2026-07-22 11:34:40 +02:00
parent b5483446d3
commit 933b195bcb
1 changed files with 3 additions and 9 deletions
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12
libavcodec/vc1dsp.c
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@@ -166,17 +166,11 @@ static av_always_inline int vc1_filter_line(uint8_t *src, ptrdiff_t stride, int
clip = ((clip ^ clip_sign) - clip_sign) >> 1;
if (clip) {
int a3 = FFMIN(a1, a2);
int d = 5 * (a3 - a0);
int d_sign = (d >> 31);
int d = (5 * (a0 - a3)) >> 3;
d = ((d ^ d_sign) - d_sign) >> 3;
d_sign ^= a0_sign;
if (d_sign ^ clip_sign)
d = 0;
else {
if (a0_sign ^ clip_sign) {
d = FFMIN(d, clip);
d = (d ^ d_sign) - d_sign; /* Restore sign */
d = (d ^ clip_sign) - clip_sign; /* Restore sign */
src[-1 * stride] = av_clip_uint8(src[-1 * stride] - d);
src[ 0 * stride] = av_clip_uint8(src[ 0 * stride] + d);
}