libretro/ppsspp
1
0
Fork 0
mirror of https://github.com/libretro/ppsspp.git synced 2025-02-16 06:57:46 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Add a non-SSE implementation of the QuickTexHash.

Browse Source 
This way we can use it as a stable value for texture replacements.
This commit is contained in:
Unknown W. Brackets 2014-10-26 20:55:29 -07:00
parent 1fe2af3421
commit 3977f5a8ec
2 changed files with 53 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
GPU/Common/TextureDecoder.cpp
View File

@ -39,7 +39,7 @@ u32 QuickTexHashSSE2(const void *checkp, u32 size) {
const __m128i *p = (const __m128i *)checkp;
for (u32 i = 0; i < size / 16; i += 4) {
__m128i chunk = _mm_mullo_epi16(_mm_load_si128(&p[i]), cursor2);
cursor = _mm_add_epi32(cursor, chunk);
cursor = _mm_add_epi16(cursor, chunk);
cursor = _mm_xor_si128(cursor, _mm_load_si128(&p[i + 1]));
cursor = _mm_add_epi32(cursor, _mm_load_si128(&p[i + 2]));
chunk = _mm_mullo_epi16(_mm_load_si128(&p[i + 3]), cursor2);
@ -63,6 +63,57 @@ u32 QuickTexHashSSE2(const void *checkp, u32 size) {
}
#endif
u32 QuickTexHashNonSSE(const void *checkp, u32 size) {
u32 check = 0;
if (((intptr_t)checkp & 0xf) == 0 && (size & 0x3f) == 0) {
static const u16 cursor2_initial[8] = {0xc00bU, 0x9bd9U, 0x4b73U, 0xb651U, 0x4d9bU, 0x4309U, 0x0083U, 0x0001U};
union u32x4_u16x8 {
u32 x32[4];
u16 x16[8];
};
u32x4_u16x8 cursor = {0, 0, 0, 0};
u32x4_u16x8 cursor2;
static const u16 update[8] = {0x2455U, 0x2455U, 0x2455U, 0x2455U, 0x2455U, 0x2455U, 0x2455U, 0x2455U};
for (u32 j = 0; j < 8; ++j) {
cursor2.x16[j] = cursor2_initial[j];
}
const u32x4_u16x8 *p = (const u32x4_u16x8 *)checkp;
for (u32 i = 0; i < size / 16; i += 4) {
for (u32 j = 0; j < 8; ++j) {
const u16 temp = p[i + 0].x16[j] * cursor2.x16[j];
cursor.x16[j] += temp;
}
for (u32 j = 0; j < 4; ++j) {
cursor.x32[j] ^= p[i + 1].x32[j];
cursor.x32[j] += p[i + 2].x32[j];
}
for (u32 j = 0; j < 8; ++j) {
const u16 temp = p[i + 3].x16[j] * cursor2.x16[j];
cursor.x16[j] ^= temp;
}
for (u32 j = 0; j < 8; ++j) {
cursor2.x16[j] += update[j];
}
}
for (u32 j = 0; j < 4; ++j) {
cursor.x32[j] += cursor2.x32[j];
}
check = cursor.x32[0] + cursor.x32[1] + cursor.x32[2] + cursor.x32[3];
} else {
const u32 *p = (const u32 *)checkp;
for (u32 i = 0; i < size / 8; ++i) {
check += *p++;
check ^= *p++;
}
}
return check;
}
static u32 QuickTexHashBasic(const void *checkp, u32 size) {
#if defined(ARM) && defined(__GNUC__)
__builtin_prefetch(checkp, 0, 0);

2
GPU/Common/TextureDecoderNEON.cpp
View File

@ -22,7 +22,7 @@
#error Should not be compiled on non-ARM.
#endif
static const u16 MEMORY_ALIGNED16(QuickTexHashInitial[8]) = {0x0001U, 0x0083U, 0x4309U, 0x4d9bU, 0xb651U, 0x4b73U, 0x9bd9U, 0xc00bU};
static const u16 MEMORY_ALIGNED16(QuickTexHashInitial[8]) = {0xc00bU, 0x9bd9U, 0x4b73U, 0xb651U, 0x4d9bU, 0x4309U, 0x0083U, 0x0001U};
u32 QuickTexHashNEON(const void *checkp, u32 size) {
u32 check = 0;