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New SSSE3 implementation for I4 texture decode. 14% speedup over the previous SSE4 implementation (so it was scrapped). 

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6783 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
xsacha 2011-01-08 08:07:45 +00:00
parent aac34f037f
commit 394534814b
1 changed files with 65 additions and 69 deletions
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76
Source/Core/VideoCommon/Src/TextureDecoder.cpp
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@ -967,81 +967,77 @@ PC_TexFormat TexDecoder_Decode_RGBA(u32 * dst, const u8 * src, int width, int he
for (int iy = 0; iy < 8; iy += 2, src += 8)
{
// Expand [BA] to [BB][BB][BB][BB] [AA][AA][AA][AA], where [BA] is a single byte and A and B are 4-bit values.
// Load 64 bits from `src` into an __m128i with upper 64 bits zeroed: (0000 0000 hgfe dcba)
// Load 64 bits with upper 64 bits zeroed: (0000 0000 hgfe dcba)
// dcba is row #0 and hgfe is row #1. We process two rows at once with each loop iteration, hence iy += 2.
const __m128i r0 = _mm_loadl_epi64((const __m128i *)src);
__m128i o1, o2, o3, o4;
#if _M_SSE >= 0x301
if (cpu_info.bSSSE3) {
const __m128i mask9180 = _mm_set_epi8(9,9,9,9,1,1,1,1,8,8,8,8,0,0,0,0);
const __m128i maskB3A2 = _mm_set_epi8(11,11,11,11,3,3,3,3,10,10,10,10,2,2,2,2);
const __m128i maskD5C4 = _mm_set_epi8(13,13,13,13,5,5,5,5,12,12,12,12,4,4,4,4);
const __m128i maskF7E6 = _mm_set_epi8(15,15,15,15,7,7,7,7,14,14,14,14,6,6,6,6);
// We want the hi 4 bits of each 8-bit word replicated to 32-bit words:
// (00000000 00000000 HhGgFfEe DdCcBbAa) -> (00000000 00000000 HHGGFFEE DDCCBBAA)
const __m128i i1 = _mm_and_si128(r0, kMask_xf0);
const __m128i i11 = _mm_or_si128(i1, _mm_srli_epi16(i1, 4));
// Now we do same as above for the second half of the byte
const __m128i i2 = _mm_and_si128(r0, kMask_x0f);
const __m128i i22 = _mm_or_si128(i2, _mm_slli_epi16(i2,4));
// Combine both sides
const __m128i base = _mm_unpacklo_epi64(i11,i22);
// Achieve the pattern visible in the masks.
const __m128i o1 = _mm_shuffle_epi8(base, mask9180);
const __m128i o2 = _mm_shuffle_epi8(base, maskB3A2);
const __m128i o3 = _mm_shuffle_epi8(base, maskD5C4);
const __m128i o4 = _mm_shuffle_epi8(base, maskF7E6);
} else
#endif
{
// Shuffle low 64-bits with itself to expand from (0000 0000 hgfe dcba) to (hhgg ffee ddcc bbaa)
const __m128i r1 = _mm_unpacklo_epi8(r0, r0);
// We want the hi 4 bits of each 8-bit word replicated to 32-bit words:
// (HhHhGgGg FfFfEeEe DdDdCcCc BbBbAaAa) >> 4 [16] -> (0HhH0GgG 0FfF0EeE 0DdD0CcC 0BbB0AaA)
const __m128i i1 = _mm_srli_epi16(r1, 4);
// (0HhH0GgG 0FfF0EeE 0DdD0CcC 0BbB0AaA) & kMask_x0f -> (0H0H0G0G 0F0F0E0E 0D0D0C0C 0B0B0A0A)
const __m128i i12 = _mm_and_si128(i1, kMask_x0f);
// (HhHhGgGg FfFfEeEe DdDdCcCc BbBbAaAa) & kMask_xf0 -> (H0H0G0G0 F0F0E0E0 D0D0C0C0 B0B0A0A0)
const __m128i i13 = _mm_and_si128(r1, kMask_xf0);
// (0H0H0G0G 0F0F0E0E 0D0D0C0C 0B0B0A0A) | (H0H0G0G0 F0F0E0E0 D0D0C0C0 B0B0A0A0) -> (HHHHGGGG FFFFEEEE DDDDCCCC BBBBAAAA)
const __m128i i14 = _mm_or_si128(i12, i13);
const __m128i i1 = _mm_and_si128(r1, kMask_xf0);
// -> (HHHHGGGG FFFFEEEE DDDDCCCC BBBBAAAA)
const __m128i i11 = _mm_or_si128(i1, _mm_srli_epi16(i1, 4));
// Shuffle low 64-bits with itself to expand from (HHHHGGGG FFFFEEEE DDDDCCCC BBBBAAAA) to (DDDDDDDD CCCCCCCC BBBBBBBB AAAAAAAA)
const __m128i i15 = _mm_unpacklo_epi8(i14, i14);
const __m128i i15 = _mm_unpacklo_epi8(i11, i11);
// (DDDDDDDD CCCCCCCC BBBBBBBB AAAAAAAA) -> (BBBBBBBB BBBBBBBB AAAAAAAA AAAAAAAA)
const __m128i i151 = _mm_unpacklo_epi8(i15, i15);
// (DDDDDDDD CCCCCCCC BBBBBBBB AAAAAAAA) -> (DDDDDDDD DDDDDDDD CCCCCCCC CCCCCCCC)
const __m128i i152 = _mm_unpackhi_epi8(i15, i15);
// Shuffle hi 64-bits with itself to expand from (HHHHGGGG FFFFEEEE DDDDCCCC BBBBAAAA) to (HHHHHHHH GGGGGGGG FFFFFFFF EEEEEEEE)
const __m128i i16 = _mm_unpackhi_epi8(i14, i14);
const __m128i i16 = _mm_unpackhi_epi8(i11, i11);
// (HHHHHHHH GGGGGGGG FFFFFFFF EEEEEEEE) -> (FFFFFFFF FFFFFFFF EEEEEEEE EEEEEEEE)
const __m128i i161 = _mm_unpacklo_epi8(i16, i16);
// (HHHHHHHH GGGGGGGG FFFFFFFF EEEEEEEE) -> (HHHHHHHH HHHHHHHH GGGGGGGG GGGGGGGG)
const __m128i i162 = _mm_unpackhi_epi8(i16, i16);
// Now find the lo 4 bits of each input 8-bit word:
// (HhHhGgGg FfFfEeEe DdDdCcCc BbBbAaAa) & kMask_x0f -> (0h0h0g0g 0f0f0e0e 0d0d0c0c 0b0b0a0a)
const __m128i i2 = _mm_and_si128(r1, kMask_x0f);
// (HhHhGgGg FfFfEeEe DdDdCcCc BbBbAaAa) << 4 [16] -> (hHh0gGg0 fFf0eEe0 dDd0cCc0 bBb0aAa0)
const __m128i i21 = _mm_slli_epi16(r1, 4);
// (hHh0gGg0 fFf0eEe0 dDd0cCc0 bBb0aAa0) & kMask_xf0 -> (h0h0g0g0 f0f0e0e0 d0d0c0c0 b0b0a0a0)
const __m128i i22 = _mm_and_si128(i21, kMask_xf0);
const __m128i i22 = _mm_or_si128(i2, _mm_slli_epi16(i2,4));
// (0h0h0g0g 0f0f0e0e 0d0d0c0c 0b0b0a0a) | (h0h0g0g0 f0f0e0e0 d0d0c0c0 b0b0a0a0) -> (hhhhgggg ffffeeee ddddcccc bbbbaaaa)
const __m128i i23 = _mm_or_si128(i2, i22);
// Shuffle low 64-bits with itself to expand from (hhhhgggg ffffeeee ddddcccc bbbbaaaa) to (dddddddd cccccccc bbbbbbbb aaaaaaaa)
const __m128i i25 = _mm_unpacklo_epi8(i23, i23);
// (dddddddd cccccccc bbbbbbbb aaaaaaaa) -> (bbbbbbbb bbbbbbbb aaaaaaaa aaaaaaaa)
const __m128i i25 = _mm_unpacklo_epi8(i22, i22);
const __m128i i251 = _mm_unpacklo_epi8(i25, i25);
// (dddddddd cccccccc bbbbbbbb aaaaaaaa) -> (dddddddd dddddddd cccccccc cccccccc)
const __m128i i252 = _mm_unpackhi_epi8(i25, i25);
// Shuffle hi 64-bits with itself to expand from (hhhhgggg ffffeeee ddddcccc bbbbaaaa) to (hhhhhhhh gggggggg ffffffff eeeeeeee)
const __m128i i26 = _mm_unpackhi_epi8(i23, i23);
// (hhhhhhhh gggggggg ffffffff eeeeeeee) -> (ffffffff ffffffff eeeeeeee eeeeeeee)
const __m128i i26 = _mm_unpackhi_epi8(i22, i22);
const __m128i i261 = _mm_unpacklo_epi8(i26, i26);
// (hhhhhhhh gggggggg ffffffff eeeeeeee) -> (hhhhhhhh hhhhhhhh gggggggg gggggggg)
const __m128i i262 = _mm_unpackhi_epi8(i26, i26);
// Now create the final output m128is to write to memory:
// _mm_and_si128(i151, kMask_x00000000ffffffff) takes i151 and masks off 1st and 3rd 32-bit words
// (BBBBBBBB BBBBBBBB AAAAAAAA AAAAAAAA) -> (00000000 BBBBBBBB 00000000 AAAAAAAA)
// _mm_and_si128(i251, kMask_xffffffff00000000) takes i251 and masks off 2nd and 4th 32-bit words
// (bbbbbbbb bbbbbbbb aaaaaaaa aaaaaaaa) -> (bbbbbbbb 00000000 aaaaaaaa 00000000)
// And last but not least, _mm_or_si128 ORs those two together, giving us the interleaving we desire:
// (00000000 BBBBBBBB 00000000 AAAAAAAA) | (bbbbbbbb 00000000 aaaaaaaa 00000000) -> (bbbbbbbb BBBBBBBB aaaaaaaa AAAAAAAA)
__m128i o1, o2, o3, o4;
#if _M_SSE >= 0x401
// SSE4 gives 5-10% improvement in I4 texture decode when this runs:
if (cpu_info.bSSE4_1) {
o1 = _mm_blend_epi16(i251, i151, 0x33); // 0x33 = 00110011
o2 = _mm_blend_epi16(i252, i152, 0x33);
o3 = _mm_blend_epi16(i261, i161, 0x33);
o4 = _mm_blend_epi16(i262, i162, 0x33);
} else
#endif
{
const __m128i kMask_x00000000ffffffff = _mm_set_epi32(0x00000000L, 0xffffffffL, 0x00000000L, 0xffffffffL);
const __m128i kMask_xffffffff00000000 = _mm_set_epi32(0xffffffffL, 0x00000000L, 0xffffffffL, 0x00000000L);
o1 = _mm_or_si128(_mm_and_si128(i151, kMask_x00000000ffffffff), _mm_and_si128(i251, kMask_xffffffff00000000));