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Use the full register in PredictorSub13_SSE2

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No more than 15 registers are used at a time

Change-Id: I40f77d9df8500e5e0d52ff6b206d765e8be62ae1
This commit is contained in:
Vincent Rabaud 2025-03-25 11:07:15 +01:00
parent 613be8fc61
commit 9dd5ae819b
1 changed files with 37 additions and 19 deletions
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56
src/dsp/lossless_enc_sse2.c
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@ -645,25 +645,43 @@ static void PredictorSub13_SSE2(const uint32_t* in, const uint32_t* upper,
int num_pixels, uint32_t* WEBP_RESTRICT out) {
int i;
const __m128i zero = _mm_setzero_si128();
for (i = 0; i + 2 <= num_pixels; i += 2) {
// we can only process two pixels at a time
const __m128i L = _mm_loadl_epi64((const __m128i*)&in[i - 1]);
const __m128i src = _mm_loadl_epi64((const __m128i*)&in[i]);
const __m128i T = _mm_loadl_epi64((const __m128i*)&upper[i]);
const __m128i TL = _mm_loadl_epi64((const __m128i*)&upper[i - 1]);
const __m128i L_lo = _mm_unpacklo_epi8(L, zero);
const __m128i T_lo = _mm_unpacklo_epi8(T, zero);
const __m128i TL_lo = _mm_unpacklo_epi8(TL, zero);
const __m128i sum = _mm_add_epi16(T_lo, L_lo);
const __m128i avg = _mm_srli_epi16(sum, 1);
const __m128i A1 = _mm_sub_epi16(avg, TL_lo);
const __m128i bit_fix = _mm_cmpgt_epi16(TL_lo, avg);
const __m128i A2 = _mm_sub_epi16(A1, bit_fix);
const __m128i A3 = _mm_srai_epi16(A2, 1);
const __m128i A4 = _mm_add_epi16(avg, A3);
const __m128i pred = _mm_packus_epi16(A4, A4);
const __m128i res = _mm_sub_epi8(src, pred);
_mm_storel_epi64((__m128i*)&out[i], res);
for (i = 0; i + 4 <= num_pixels; i += 4) {
const __m128i L = _mm_loadu_si128((const __m128i*)&in[i - 1]);
const __m128i src = _mm_loadu_si128((const __m128i*)&in[i]);
const __m128i T = _mm_loadu_si128((const __m128i*)&upper[i]);
const __m128i TL = _mm_loadu_si128((const __m128i*)&upper[i - 1]);
__m128i A4_lo, A4_hi;
// lo.
{
const __m128i L_lo = _mm_unpacklo_epi8(L, zero);
const __m128i T_lo = _mm_unpacklo_epi8(T, zero);
const __m128i TL_lo = _mm_unpacklo_epi8(TL, zero);
const __m128i sum_lo = _mm_add_epi16(T_lo, L_lo);
const __m128i avg_lo = _mm_srli_epi16(sum_lo, 1);
const __m128i A1_lo = _mm_sub_epi16(avg_lo, TL_lo);
const __m128i bit_fix_lo = _mm_cmpgt_epi16(TL_lo, avg_lo);
const __m128i A2_lo = _mm_sub_epi16(A1_lo, bit_fix_lo);
const __m128i A3_lo = _mm_srai_epi16(A2_lo, 1);
A4_lo = _mm_add_epi16(avg_lo, A3_lo);
}
// hi.
{
const __m128i L_hi = _mm_unpackhi_epi8(L, zero);
const __m128i T_hi = _mm_unpackhi_epi8(T, zero);
const __m128i TL_hi = _mm_unpackhi_epi8(TL, zero);
const __m128i sum_hi = _mm_add_epi16(T_hi, L_hi);
const __m128i avg_hi = _mm_srli_epi16(sum_hi, 1);
const __m128i A1_hi = _mm_sub_epi16(avg_hi, TL_hi);
const __m128i bit_fix_hi = _mm_cmpgt_epi16(TL_hi, avg_hi);
const __m128i A2_hi = _mm_sub_epi16(A1_hi, bit_fix_hi);
const __m128i A3_hi = _mm_srai_epi16(A2_hi, 1);
A4_hi = _mm_add_epi16(avg_hi, A3_hi);
}
{
const __m128i pred = _mm_packus_epi16(A4_lo, A4_hi);
const __m128i res = _mm_sub_epi8(src, pred);
_mm_storeu_si128((__m128i*)&out[i], res);
}
}
if (i != num_pixels) {
VP8LPredictorsSub_C[13](in + i, upper + i, num_pixels - i, out + i);