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simplify Load8x4() a bit

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Change-Id: I68cf09c432f48e34bbe1d47dd091417cfd40cf4e
This commit is contained in:
Pascal Massimino 2015-06-06 15:10:26 -07:00 committed by James Zern
parent 8df238ec8a
commit 422ec9fb62
1 changed files with 30 additions and 45 deletions
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59
src/dsp/dec_sse2.c
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@ -520,47 +520,31 @@ static WEBP_INLINE void DoFilter6(__m128i* const p2, __m128i* const p1,
}
// reads 8 rows across a vertical edge.
//
// TODO(somnath): Investigate _mm_shuffle* also see if it can be broken into
// two Load4x4() to avoid code duplication.
static WEBP_INLINE void Load8x4(const uint8_t* const b, int stride,
__m128i* const p, __m128i* const q) {
__m128i t1, t2;
// A0 = 63 62 61 60 23 22 21 20 43 42 41 40 03 02 01 00
// A1 = 73 72 71 70 33 32 31 30 53 52 51 50 13 12 11 10
const __m128i A0 = _mm_set_epi32(
*(const int*)&b[6 * stride], *(const int*)&b[2 * stride],
*(const int*)&b[4 * stride], *(const int*)&b[0 * stride]);
const __m128i A1 = _mm_set_epi32(
*(const int*)&b[7 * stride], *(const int*)&b[3 * stride],
*(const int*)&b[5 * stride], *(const int*)&b[1 * stride]);
// Load 0th, 1st, 4th and 5th rows
__m128i r0 = _mm_cvtsi32_si128(*(const int*)&b[0 * stride]); // 03 02 01 00
__m128i r1 = _mm_cvtsi32_si128(*(const int*)&b[1 * stride]); // 13 12 11 10
__m128i r4 = _mm_cvtsi32_si128(*(const int*)&b[4 * stride]); // 43 42 41 40
__m128i r5 = _mm_cvtsi32_si128(*(const int*)&b[5 * stride]); // 53 52 51 50
// B0 = 53 43 52 42 51 41 50 40 13 03 12 02 11 01 10 00
// B1 = 73 63 72 62 71 61 70 60 33 23 32 22 31 21 30 20
const __m128i B0 = _mm_unpacklo_epi8(A0, A1);
const __m128i B1 = _mm_unpackhi_epi8(A0, A1);
r0 = _mm_unpacklo_epi32(r0, r4); // 43 42 41 40 03 02 01 00
r1 = _mm_unpacklo_epi32(r1, r5); // 53 52 51 50 13 12 11 10
// t1 = 53 43 52 42 51 41 50 40 13 03 12 02 11 01 10 00
t1 = _mm_unpacklo_epi8(r0, r1);
// Load 2nd, 3rd, 6th and 7th rows
r0 = _mm_cvtsi32_si128(*(const int*)&b[2 * stride]); // 23 22 21 22
r1 = _mm_cvtsi32_si128(*(const int*)&b[3 * stride]); // 33 32 31 30
r4 = _mm_cvtsi32_si128(*(const int*)&b[6 * stride]); // 63 62 61 60
r5 = _mm_cvtsi32_si128(*(const int*)&b[7 * stride]); // 73 72 71 70
r0 = _mm_unpacklo_epi32(r0, r4); // 63 62 61 60 23 22 21 20
r1 = _mm_unpacklo_epi32(r1, r5); // 73 72 71 70 33 32 31 30
// t2 = 73 63 72 62 71 61 70 60 33 23 32 22 31 21 30 20
t2 = _mm_unpacklo_epi8(r0, r1);
// t1 = 33 23 13 03 32 22 12 02 31 21 11 01 30 20 10 00
// t2 = 73 63 53 43 72 62 52 42 71 61 51 41 70 60 50 40
r0 = t1;
t1 = _mm_unpacklo_epi16(t1, t2);
t2 = _mm_unpackhi_epi16(r0, t2);
// C0 = 33 23 13 03 32 22 12 02 31 21 11 01 30 20 10 00
// C1 = 73 63 53 43 72 62 52 42 71 61 51 41 70 60 50 40
const __m128i C0 = _mm_unpacklo_epi16(B0, B1);
const __m128i C1 = _mm_unpackhi_epi16(B0, B1);
// *p = 71 61 51 41 31 21 11 01 70 60 50 40 30 20 10 00
// *q = 73 63 53 43 33 23 13 03 72 62 52 42 32 22 12 02
*p = _mm_unpacklo_epi32(t1, t2);
*q = _mm_unpackhi_epi32(t1, t2);
*p = _mm_unpacklo_epi32(C0, C1);
*q = _mm_unpackhi_epi32(C0, C1);
}
static WEBP_INLINE void Load16x4(const uint8_t* const r0,
@ -568,7 +552,6 @@ static WEBP_INLINE void Load16x4(const uint8_t* const r0,
int stride,
__m128i* const p1, __m128i* const p0,
__m128i* const q0, __m128i* const q1) {
__m128i t1, t2;
// Assume the pixels around the edge (|) are numbered as follows
// 00 01 | 02 03
// 10 11 | 12 13
@ -587,16 +570,18 @@ static WEBP_INLINE void Load16x4(const uint8_t* const r0,
Load8x4(r0, stride, p1, q0);
Load8x4(r8, stride, p0, q1);
t1 = *p1;
t2 = *q0;
{
// p1 = f0 e0 d0 c0 b0 a0 90 80 70 60 50 40 30 20 10 00
// p0 = f1 e1 d1 c1 b1 a1 91 81 71 61 51 41 31 21 11 01
// q0 = f2 e2 d2 c2 b2 a2 92 82 72 62 52 42 32 22 12 02
// q1 = f3 e3 d3 c3 b3 a3 93 83 73 63 53 43 33 23 13 03
const __m128i t1 = *p1;
const __m128i t2 = *q0;
*p1 = _mm_unpacklo_epi64(t1, *p0);
*p0 = _mm_unpackhi_epi64(t1, *p0);
*q0 = _mm_unpacklo_epi64(t2, *q1);
*q1 = _mm_unpackhi_epi64(t2, *q1);
}
}
static WEBP_INLINE void Store4x4(__m128i* const x, uint8_t* dst, int stride) {