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VideoCommon: An experimental fix for Issue 3493. Changed _mm_load_si128 to _mm_loadu_si128. I could not test the bug because I don't have Sonic Colors.

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git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6402 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
nodchip 2010-11-14 04:29:20 +00:00
parent 9b12ad6c94
commit d888f13bb9
1 changed files with 10 additions and 48 deletions
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58
Source/Core/VideoCommon/Src/TextureDecoder.cpp
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@ -673,10 +673,6 @@ PC_TexFormat GetPC_TexFormat(int texformat, int tlutfmt)
return PC_TEX_FMT_NONE;
}
#if _M_SSE >= 0x301
static const __m128i kMaskSwap32 = _mm_set_epi32(0x0C0D0E0FL, 0x08090A0BL, 0x04050607L, 0x00010203L);
#endif
//switch endianness, unswizzle
//TODO: to save memory, don't blindly convert everything to argb8888
//also ARGB order needs to be swapped later, to accommodate modern hardware better
@ -819,46 +815,6 @@ PC_TexFormat TexDecoder_Decode_real(u8 *dst, const u8 *src, int width, int heigh
case GX_TF_RGBA8: // speed critical
{
// FIXME(nodchip): the following code is too complicated.
#if _M_SSE >= 0x401
if (cpu_info.bSSE4_1) {
for (int y = 0; y < height; y += 4) {
__m128i* p = (__m128i*)(src + y * width * 4);
for (int x = 0; x < width; x += 4) {
// Load 64-bytes at once.
const __m128i a0 = _mm_stream_load_si128(p++);
const __m128i a1 = _mm_stream_load_si128(p++);
const __m128i a2 = _mm_stream_load_si128(p++);
const __m128i a3 = _mm_stream_load_si128(p++);
// Shuffle 16-bit integeres by _mm_unpacklo_epi16()/_mm_unpackhi_epi16(),
// apply Common::swap32() by _mm_shuffle_epi8() and
// store them by _mm_stream_si128().
// See decodebytesARGB8_4() about the idea.
const __m128i b0 = _mm_unpacklo_epi16(a0, a2);
const __m128i c0 = _mm_shuffle_epi8(b0, kMaskSwap32);
_mm_stream_si128((__m128i*)((u32*)dst + (y + 0) * width + x), c0);
const __m128i b1 = _mm_unpackhi_epi16(a0, a2);
const __m128i c1 = _mm_shuffle_epi8(b1, kMaskSwap32);
_mm_stream_si128((__m128i*)((u32*)dst + (y + 1) * width + x), c1);
const __m128i b2 = _mm_unpacklo_epi16(a1, a3);
const __m128i c2 = _mm_shuffle_epi8(b2, kMaskSwap32);
_mm_stream_si128((__m128i*)((u32*)dst + (y + 2) * width + x), c2);
const __m128i b3 = _mm_unpackhi_epi16(a1, a3);
const __m128i c3 = _mm_shuffle_epi8(b3, kMaskSwap32);
_mm_stream_si128((__m128i*)((u32*)dst + (y + 3) * width + x), c3);
}
}
} else
#endif
#if _M_SSE >= 0x301
if (cpu_info.bSSSE3) {
@ -866,15 +822,21 @@ PC_TexFormat TexDecoder_Decode_real(u8 *dst, const u8 *src, int width, int heigh
__m128i* p = (__m128i*)(src + y * width * 4);
for (int x = 0; x < width; x += 4) {
const __m128i a0 = _mm_load_si128(p++);
const __m128i a1 = _mm_load_si128(p++);
const __m128i a2 = _mm_load_si128(p++);
const __m128i a3 = _mm_load_si128(p++);
// We use _mm_loadu_si128 instead of _mm_load_si128
// because "p" may not be aligned in 16-bytes alignment.
// See Issue 3493.
const __m128i a0 = _mm_loadu_si128(p++);
const __m128i a1 = _mm_loadu_si128(p++);
const __m128i a2 = _mm_loadu_si128(p++);
const __m128i a3 = _mm_loadu_si128(p++);
// Shuffle 16-bit integeres by _mm_unpacklo_epi16()/_mm_unpackhi_epi16(),
// apply Common::swap32() by _mm_shuffle_epi8() and
// store them by _mm_stream_si128().
// See decodebytesARGB8_4() about the idea.
static const __m128i kMaskSwap32 = _mm_set_epi32(0x0C0D0E0FL, 0x08090A0BL, 0x04050607L, 0x00010203L);
const __m128i b0 = _mm_unpacklo_epi16(a0, a2);
const __m128i c0 = _mm_shuffle_epi8(b0, kMaskSwap32);
_mm_stream_si128((__m128i*)((u32*)dst + (y + 0) * width + x), c0);