github.com/captain-amygdala.pistorm
1
0
Fork 0
mirror of https://github.com/captain-amygdala/pistorm.git synced 2026-01-28 12:39:10 +00:00
Code Issues Projects Releases Wiki Activity

pull the PC masking into the code translation cache, so that we only need to mask the PC on our slow path. Gives us another 5-10% speedup.

Browse Source
This commit is contained in:
Rune Holm
2021-06-11 19:34:03 +01:00
parent 3203ac8590
commit fe3b4bb032
2 changed files with 10 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
m68kcpu.c
View File

@@ -1254,12 +1254,14 @@ inline unsigned int m68k_read_pcrelative_32(unsigned int address) {
#endif
uint m68ki_read_imm6_addr_slowpath(uint32_t address, address_translation_cache *cache)
uint m68ki_read_imm6_addr_slowpath(uint32_t pc, address_translation_cache *cache)
{
uint32_t address = ADDRESS_68K(pc);
uint32_t pc_address_diff = pc - address;
for (int i = 0; i < read_ranges; i++) {
if(address >= read_addr[i] && address < read_upper[i]) {
cache->lower = read_addr[i];
cache->upper = read_upper[i];
cache->lower = read_addr[i] + pc_address_diff;
cache->upper = read_upper[i] + pc_address_diff;
cache->data = read_data[i];
REG_PC += 2;
return be16toh(((unsigned short *)(read_data[i] + (address - read_addr[i])))[0]);

10
m68kcpu.h
View File

@@ -1161,21 +1161,21 @@ static inline uint32 m68ki_ic_readimm16(uint32 address)
/* Handles all immediate reads, does address error check, function code setting,
* and prefetching if they are enabled in m68kconf.h
*/
uint m68ki_read_imm6_addr_slowpath(uint32_t address, address_translation_cache *cache);
uint m68ki_read_imm6_addr_slowpath(uint32_t pc, address_translation_cache *cache);
static inline uint m68ki_read_imm_16(void)
{
uint32_t address = ADDRESS_68K(REG_PC);
uint32_t pc = REG_PC;
address_translation_cache *cache = &code_translation_cache;
if(address >= cache->lower && address < cache->upper)
if(pc >= cache->lower && pc < cache->upper)
{
REG_PC += 2;
return be16toh(((unsigned short *)(cache->data + (address - cache->lower)))[0]);
return be16toh(((unsigned short *)(cache->data + (pc - cache->lower)))[0]);
}
return m68ki_read_imm6_addr_slowpath(address, cache);
return m68ki_read_imm6_addr_slowpath(pc, cache);
}