ShuriZma
/
melonDS
mirror of https://github.com/melonDS-emu/melonDS.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

add notes

This commit is contained in:
Jaklyy 2024-10-15 12:32:13 -04:00
parent d8d2fcd94a
commit d476593eec
1 changed files with 67 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

116
src/CP15.cpp
View File

@ -379,18 +379,21 @@ u32 ARMv5::ICacheLookup(const u32 addr)
const u32 id = ((addr >> ICACHE_LINELENGTH_LOG2) & (ICACHE_LINESPERSET-1)) << ICACHE_SETS_LOG2;
#if defined(__x86_64__)
__m128i tags; memcpy(&tags, &ICacheTags[id], 16);
__m128i mask = _mm_set1_epi32(~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK));
__m128i cmp = _mm_set1_epi32(tag | CACHE_FLAG_VALID);
tags = _mm_and_si128(tags, mask);
cmp = _mm_cmpeq_epi32(tags, cmp);
u32 set = _mm_movemask_epi8(cmp);
// we use sse here to greatly speed up checking for valid sets vs the fallback for loop
if (!set) goto miss;
else set = (__builtin_ctz(set) >> 2);
__m128i tags; memcpy(&tags, &ICacheTags[id], 16); // load the tags for all 4 sets, one for each 32 bits
__m128i mask = _mm_set1_epi32(~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK)); // load copies of the mask into each 32 bits
__m128i cmp = _mm_set1_epi32(tag | CACHE_FLAG_VALID); // load the tag we're checking for into each 32 bit
tags = _mm_and_si128(tags, mask); // mask out the bits we dont want to check for
cmp = _mm_cmpeq_epi32(tags, cmp); // compare to see if any bits match
u32 set = _mm_movemask_epi8(cmp); // move the 8 msb of each field into a single 32 bit integer
if (!set) goto miss; // check if none of them were a match
else set = (__builtin_ctz(set) >> 2); // count trailing zeros and right shift to figure out which set had a match
{
#else
// fallback for loop; slow
for (int set = 0; set < ICACHE_SETS; set++)
{
if ((ICacheTags[id+set] & ~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK)) == (tag | CACHE_FLAG_VALID))
@ -546,18 +549,21 @@ u32 ARMv5::DCacheLookup(const u32 addr)
const u32 id = ((addr >> DCACHE_LINELENGTH_LOG2) & (DCACHE_LINESPERSET-1)) << DCACHE_SETS_LOG2;
#if defined(__x86_64__)
__m128i tags; memcpy(&tags, &DCacheTags[id], 16);
__m128i mask = _mm_set1_epi32(~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK));
__m128i cmp = _mm_set1_epi32(tag | CACHE_FLAG_VALID);
tags = _mm_and_si128(tags, mask);
cmp = _mm_cmpeq_epi32(tags, cmp);
u32 set = _mm_movemask_epi8(cmp);
// we use sse here to greatly speed up checking for valid sets vs the fallback for loop
if (!set) goto miss;
else set = (__builtin_ctz(set) >> 2);
__m128i tags; memcpy(&tags, &DCacheTags[id], 16); // load the tags for all 4 sets, one for each 32 bits
__m128i mask = _mm_set1_epi32(~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK)); // load copies of the mask into each 32 bits
__m128i cmp = _mm_set1_epi32(tag | CACHE_FLAG_VALID); // load the tag we're checking for into each 32 bit
tags = _mm_and_si128(tags, mask); // mask out the bits we dont want to check for
cmp = _mm_cmpeq_epi32(tags, cmp); // compare to see if any bits match
u32 set = _mm_movemask_epi8(cmp); // move the 8 msb of each field into a single 32 bit integer
if (!set) goto miss; // check if none of them were a match
else set = (__builtin_ctz(set) >> 2); // count trailing zeros and right shift to figure out which set had a match
{
#else
// fallback for loop; slow
for (int set = 0; set < DCACHE_SETS; set++)
{
if ((DCacheTags[id+set] & ~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK)) == (tag | CACHE_FLAG_VALID))
@ -665,18 +671,21 @@ bool ARMv5::DCacheWrite32(const u32 addr, const u32 val)
//Log(LogLevel::Debug, "Cache write 32: %08lx <= %08lx\n", addr, val);
#if defined(__x86_64__)
__m128i tags; memcpy(&tags, &DCacheTags[id], 16);
__m128i mask = _mm_set1_epi32(~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK));
__m128i cmp = _mm_set1_epi32(tag);
tags = _mm_and_si128(tags, mask);
cmp = _mm_cmpeq_epi32(tags, cmp);
u32 set = _mm_movemask_epi8(cmp);
// we use sse here to greatly speed up checking for valid sets vs the fallback for loop
if (!set) return false;
else set = (__builtin_ctz(set) >> 2);
__m128i tags; memcpy(&tags, &DCacheTags[id], 16); // load the tags for all 4 sets, one for each 32 bits
__m128i mask = _mm_set1_epi32(~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK)); // load copies of the mask into each 32 bits
__m128i cmp = _mm_set1_epi32(tag); // load the tag we're checking for into each 32 bit
tags = _mm_and_si128(tags, mask); // mask out the bits we dont want to check for
cmp = _mm_cmpeq_epi32(tags, cmp); // compare to see if any bits match
u32 set = _mm_movemask_epi8(cmp); // move the 8 msb of each field into a single 32 bit integer
if (!set) return false; // check if none of them were a match
else set = (__builtin_ctz(set) >> 2); // count trailing zeros and right shift to figure out which set had a match
{
#else
// fallback for loop; slow
for (int set = 0; set < DCACHE_SETS; set++)
{
if ((DCacheTags[id+set] & ~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK)) == tag)
@ -714,18 +723,21 @@ bool ARMv5::DCacheWrite16(const u32 addr, const u16 val)
//Log(LogLevel::Debug, "Cache write 16: %08lx <= %04x\n", addr, val);
#if defined(__x86_64__)
__m128i tags; memcpy(&tags, &DCacheTags[id], 16);
__m128i mask = _mm_set1_epi32(~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK));
__m128i cmp = _mm_set1_epi32(tag);
tags = _mm_and_si128(tags, mask);
cmp = _mm_cmpeq_epi32(tags, cmp);
u32 set = _mm_movemask_epi8(cmp);
// we use sse here to greatly speed up checking for valid sets vs the fallback for loop
if (!set) return false;
else set = (__builtin_ctz(set) >> 2);
__m128i tags; memcpy(&tags, &DCacheTags[id], 16); // load the tags for all 4 sets, one for each 32 bits
__m128i mask = _mm_set1_epi32(~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK)); // load copies of the mask into each 32 bits
__m128i cmp = _mm_set1_epi32(tag); // load the tag we're checking for into each 32 bit
tags = _mm_and_si128(tags, mask); // mask out the bits we dont want to check for
cmp = _mm_cmpeq_epi32(tags, cmp); // compare to see if any bits match
u32 set = _mm_movemask_epi8(cmp); // move the 8 msb of each field into a single 32 bit integer
if (!set) return false; // check if none of them were a match
else set = (__builtin_ctz(set) >> 2); // count trailing zeros and right shift to figure out which set had a match
{
#else
// fallback for loop; slow
for (int set = 0; set < DCACHE_SETS; set++)
{
if ((DCacheTags[id+set] & ~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK)) == tag)
@ -764,18 +776,21 @@ bool ARMv5::DCacheWrite8(const u32 addr, const u8 val)
//Log(LogLevel::Debug, "Cache write 8: %08lx <= %02x\n", addr, val);
#if defined(__x86_64__)
__m128i tags; memcpy(&tags, &DCacheTags[id], 16);
__m128i mask = _mm_set1_epi32(~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK));
__m128i cmp = _mm_set1_epi32(tag);
tags = _mm_and_si128(tags, mask);
cmp = _mm_cmpeq_epi32(tags, cmp);
u32 set = _mm_movemask_epi8(cmp);
// we use sse here to greatly speed up checking for valid sets vs the fallback for loop
if (!set) return false;
else set = (__builtin_ctz(set) >> 2);
__m128i tags; memcpy(&tags, &DCacheTags[id], 16); // load the tags for all 4 sets, one for each 32 bits
__m128i mask = _mm_set1_epi32(~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK)); // load copies of the mask into each 32 bits
__m128i cmp = _mm_set1_epi32(tag); // load the tag we're checking for into each 32 bit
tags = _mm_and_si128(tags, mask); // mask out the bits we dont want to check for
cmp = _mm_cmpeq_epi32(tags, cmp); // compare to see if any bits match
u32 set = _mm_movemask_epi8(cmp); // move the 8 msb of each field into a single 32 bit integer
if (!set) return false; // check if none of them were a match
else set = (__builtin_ctz(set) >> 2); // count trailing zeros and right shift to figure out which set had a match
{
#else
// fallback for loop; slow
for (int set = 0; set < DCACHE_SETS; set++)
{
if ((DCacheTags[id+set] & ~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK)) == tag)
@ -813,18 +828,21 @@ void ARMv5::DCacheInvalidateByAddr(const u32 addr)
const u32 id = ((addr >> DCACHE_LINELENGTH_LOG2) & (DCACHE_LINESPERSET-1)) << DCACHE_SETS_LOG2;
#if defined(__x86_64__)
__m128i tags; memcpy(&tags, &DCacheTags[id], 16);
__m128i mask = _mm_set1_epi32(~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK));
__m128i cmp = _mm_set1_epi32(tag);
tags = _mm_and_si128(tags, mask);
cmp = _mm_cmpeq_epi32(tags, cmp);
u32 set = _mm_movemask_epi8(cmp);
// we use sse here to greatly speed up checking for valid sets vs the fallback for loop
if (!set) return;
else set = (__builtin_ctz(set) >> 2);
__m128i tags; memcpy(&tags, &DCacheTags[id], 16); // load the tags for all 4 sets, one for each 32 bits
__m128i mask = _mm_set1_epi32(~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK)); // load copies of the mask into each 32 bits
__m128i cmp = _mm_set1_epi32(tag); // load the tag we're checking for into each 32 bit
tags = _mm_and_si128(tags, mask); // mask out the bits we dont want to check for
cmp = _mm_cmpeq_epi32(tags, cmp); // compare to see if any bits match
u32 set = _mm_movemask_epi8(cmp); // move the 8 msb of each field into a single 32 bit integer
if (!set) return; // check if none of them were a match
else set = (__builtin_ctz(set) >> 2); // count trailing zeros and right shift to figure out which set had a match
{
#else
// fallback for loop; slow
for (int set = 0; set < DCACHE_SETS; set++)
{
if ((DCacheTags[id+set] & ~(CACHE_FLAG_DIRTY_MASK | CACHE_FLAG_SET_MASK)) == tag)
@ -911,7 +929,7 @@ void ARMv5::DCacheClearByASetAndWay(const u8 cacheSet, const u8 cacheLine)
WriteBufferWrite(ptr[3], 2, cycless, tag+0x0C);
DataCycles += 5;
}
if (DCacheTags[index] & CACHE_FLAG_DIRTY_UPPERHALF)
if (DCacheTags[index] & CACHE_FLAG_DIRTY_UPPERHALF) // todo: check how this behaves when both fields need to be written
{
if (WBDelay > NDS.ARM9Timestamp) NDS.ARM9Timestamp = WBDelay;