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Small speedup in FTransform.

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It removes two _mm_unpacklo_epi32 and two _mm_sub_epi16.

Change-Id: Icdf86259f796ba855d1cda5e9c0e99cb396cb351
This commit is contained in:
Vincent Rabaud 2016-02-17 21:26:36 +01:00
parent 9dbd4aad77
commit 6e36b51188
1 changed files with 24 additions and 24 deletions
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48
src/dsp/enc_sse2.c
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@ -292,42 +292,42 @@ static void FTransformPass2(const __m128i* const v01, const __m128i* const v32,
static void FTransform(const uint8_t* src, const uint8_t* ref, int16_t* out) {
const __m128i zero = _mm_setzero_si128();
// Load src and convert to 16b.
// Load src.
const __m128i src0 = _mm_loadl_epi64((const __m128i*)&src[0 * BPS]);
const __m128i src1 = _mm_loadl_epi64((const __m128i*)&src[1 * BPS]);
const __m128i src2 = _mm_loadl_epi64((const __m128i*)&src[2 * BPS]);
const __m128i src3 = _mm_loadl_epi64((const __m128i*)&src[3 * BPS]);
const __m128i src_0 = _mm_unpacklo_epi8(src0, zero);
const __m128i src_1 = _mm_unpacklo_epi8(src1, zero);
const __m128i src_2 = _mm_unpacklo_epi8(src2, zero);
const __m128i src_3 = _mm_unpacklo_epi8(src3, zero);
// Load ref and convert to 16b.
// 00 01 02 03 *
// 10 11 12 13 *
// 20 21 22 23 *
// 30 31 32 33 *
// Shuffle.
const __m128i src_0 = _mm_unpacklo_epi16(src0, src1);
const __m128i src_1 = _mm_unpacklo_epi16(src2, src3);
// 00 01 10 11 02 03 12 13 * * ...
// 20 21 30 31 22 22 32 33 * * ...
// Load ref.
const __m128i ref0 = _mm_loadl_epi64((const __m128i*)&ref[0 * BPS]);
const __m128i ref1 = _mm_loadl_epi64((const __m128i*)&ref[1 * BPS]);
const __m128i ref2 = _mm_loadl_epi64((const __m128i*)&ref[2 * BPS]);
const __m128i ref3 = _mm_loadl_epi64((const __m128i*)&ref[3 * BPS]);
const __m128i ref_0 = _mm_unpacklo_epi8(ref0, zero);
const __m128i ref_1 = _mm_unpacklo_epi8(ref1, zero);
const __m128i ref_2 = _mm_unpacklo_epi8(ref2, zero);
const __m128i ref_3 = _mm_unpacklo_epi8(ref3, zero);
// Compute difference. -> 00 01 02 03 00 00 00 00
const __m128i diff0 = _mm_sub_epi16(src_0, ref_0);
const __m128i diff1 = _mm_sub_epi16(src_1, ref_1);
const __m128i diff2 = _mm_sub_epi16(src_2, ref_2);
const __m128i diff3 = _mm_sub_epi16(src_3, ref_3);
const __m128i ref_0 = _mm_unpacklo_epi16(ref0, ref1);
const __m128i ref_1 = _mm_unpacklo_epi16(ref2, ref3);
// Unpack and shuffle
// 00 01 02 03 0 0 0 0
// 10 11 12 13 0 0 0 0
// 20 21 22 23 0 0 0 0
// 30 31 32 33 0 0 0 0
const __m128i shuf01 = _mm_unpacklo_epi32(diff0, diff1);
const __m128i shuf23 = _mm_unpacklo_epi32(diff2, diff3);
// Convert both to 16 bit.
const __m128i src_0_16b = _mm_unpacklo_epi8(src_0, zero);
const __m128i src_1_16b = _mm_unpacklo_epi8(src_1, zero);
const __m128i ref_0_16b = _mm_unpacklo_epi8(ref_0, zero);
const __m128i ref_1_16b = _mm_unpacklo_epi8(ref_1, zero);
// Compute the difference.
const __m128i row01 = _mm_sub_epi16(src_0_16b, ref_0_16b);
const __m128i row23 = _mm_sub_epi16(src_1_16b, ref_1_16b);
__m128i v01, v32;
// First pass
FTransformPass1(&shuf01, &shuf23, &v01, &v32);
FTransformPass1(&row01, &row23, &v01, &v32);
// Second pass
FTransformPass2(&v01, &v32, out);