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dec_sse2/GetNotHEV: micro optimization

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trade 2 subtractions + logical or for 1 max + 1 subtraction

Change-Id: I7d1f25f7cda2a89bc8247f3d3d5417f6b0e3d96c
This commit is contained in:
James Zern 2015-03-27 20:29:37 -07:00
parent 422ec9fb62
commit ef314a5d6c
1 changed files with 2 additions and 3 deletions
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src/dsp/dec_sse2.c
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@ -330,10 +330,9 @@ static WEBP_INLINE void GetNotHEV(const __m128i* const p1,
const __m128i t_2 = MM_ABS(*q1, *q0);
const __m128i h = _mm_set1_epi8(hev_thresh);
const __m128i t_3 = _mm_subs_epu8(t_1, h); // abs(p1 - p0) - hev_tresh
const __m128i t_4 = _mm_subs_epu8(t_2, h); // abs(q1 - q0) - hev_tresh
const __m128i t_max = _mm_max_epu8(t_1, t_2);
*not_hev = _mm_or_si128(t_3, t_4);
*not_hev = _mm_subs_epu8(t_max, h);
*not_hev = _mm_cmpeq_epi8(*not_hev, zero); // not_hev <= t1 && not_hev <= t2
}