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An extra 5-10% speedup for I4 texture decoding with SSE4.1 intrinsics. 

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6772 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
xsacha 2011-01-07 16:00:39 +00:00
parent 418357190b
commit 9cb3340754
1 changed files with 24 additions and 13 deletions
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37
Source/Core/VideoCommon/Src/TextureDecoder.cpp
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@ -961,8 +961,6 @@ PC_TexFormat TexDecoder_Decode_RGBA(u32 * dst, const u8 * src, int width, int he
// Produces a ~76% speed increase over reference C implementation.
const __m128i kMask_x0f = _mm_set_epi32(0x0f0f0f0fL, 0x0f0f0f0fL, 0x0f0f0f0fL, 0x0f0f0f0fL);
const __m128i kMask_xf0 = _mm_set_epi32(0xf0f0f0f0L, 0xf0f0f0f0L, 0xf0f0f0f0L, 0xf0f0f0f0L);
const __m128i kMask_x00000000ffffffff = _mm_set_epi32(0x00000000L, 0xffffffffL, 0x00000000L, 0xffffffffL);
const __m128i kMask_xffffffff00000000 = _mm_set_epi32(0xffffffffL, 0x00000000L, 0xffffffffL, 0x00000000L);
for (int y = 0; y < height; y += 8)
for (int x = 0; x < width; x += 8)
@ -1033,19 +1031,32 @@ PC_TexFormat TexDecoder_Decode_RGBA(u32 * dst, const u8 * src, int width, int he
// (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)
const __m128i o1 = _mm_or_si128(_mm_and_si128(i151, kMask_x00000000ffffffff), _mm_and_si128(i251, kMask_xffffffff00000000));
const __m128i o2 = _mm_or_si128(_mm_and_si128(i152, kMask_x00000000ffffffff), _mm_and_si128(i252, kMask_xffffffff00000000));
#if _M_SSE >= 0x401
// SSE4 gives 5-10% improvement in I4 texture decode when this runs:
if (cpu_info.bSSE4_1) {
const __m128i o1 = _mm_blend_epi16(i251, i151, 0x33); // 0x33 = 00110011
const __m128i o2 = _mm_blend_epi16(i252, i152, 0x33);
const __m128i o3 = _mm_blend_epi16(i261, i161, 0x33);
const __m128i 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);
const __m128i o1 = _mm_or_si128(_mm_and_si128(i151, kMask_x00000000ffffffff), _mm_and_si128(i251, kMask_xffffffff00000000));
const __m128i o2 = _mm_or_si128(_mm_and_si128(i152, kMask_x00000000ffffffff), _mm_and_si128(i252, kMask_xffffffff00000000));
// These two are for the next row; same pattern as above. We batched up two rows because our input was 64 bits.
const __m128i o3 = _mm_or_si128(_mm_and_si128(i161, kMask_x00000000ffffffff), _mm_and_si128(i261, kMask_xffffffff00000000));
const __m128i o4 = _mm_or_si128(_mm_and_si128(i162, kMask_x00000000ffffffff), _mm_and_si128(i262, kMask_xffffffff00000000));
// These two are for the next row; same pattern as above. We batched up two rows because our input was 64 bits.
const __m128i o3 = _mm_or_si128(_mm_and_si128(i161, kMask_x00000000ffffffff), _mm_and_si128(i261, kMask_xffffffff00000000));
const __m128i o4 = _mm_or_si128(_mm_and_si128(i162, kMask_x00000000ffffffff), _mm_and_si128(i262, kMask_xffffffff00000000));
// Write row 0:
_mm_storeu_si128( (__m128i*)( dst+(y + iy) * width + x ), o1 );
_mm_storeu_si128( (__m128i*)( dst+(y + iy) * width + x + 4 ), o2 );
// Write row 1:
_mm_storeu_si128( (__m128i*)( dst+(y + iy+1) * width + x ), o3 );
_mm_storeu_si128( (__m128i*)( dst+(y + iy+1) * width + x + 4 ), o4 );
// Write row 0:
_mm_storeu_si128( (__m128i*)( dst+(y + iy) * width + x ), o1 );
_mm_storeu_si128( (__m128i*)( dst+(y + iy) * width + x + 4 ), o2 );
// Write row 1:
_mm_storeu_si128( (__m128i*)( dst+(y + iy+1) * width + x ), o3 );
_mm_storeu_si128( (__m128i*)( dst+(y + iy+1) * width + x + 4 ), o4 );
}
}
#if 0
// Reference C implementation: