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Fixing performance degrading problem

This commit is contained in:
Sergio Martin 2024-01-20 17:00:24 +01:00
parent 0afe500701
commit e376b69d84
1 changed files with 24 additions and 23 deletions
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47
source/quickerNES/cpu.cpp
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@ -121,10 +121,11 @@ imm##op: \
#define BRANCH( cond ) \ #define BRANCH( cond ) \
{ \ { \
pc++; \ pc++; \
if ( (cond) == false ) [[likely]] {clock_count--; goto loop; } \ int offset = (int8_t) data; \
int32_t offset = (int8_t) data; \ int extra_clock = (pc & 0xFF) + offset; \
int32_t extra_clock = (pc & 0xFF) + offset; \ if ( !(cond) ) {clock_count--; goto loop; } \
pc += offset; \ pc += offset; \
pc = uint16_t( pc ); \
clock_count += (extra_clock >> 8) & 1; \ clock_count += (extra_clock >> 8) & 1; \
goto loop; \ goto loop; \
} }
@ -201,7 +202,26 @@ inline void Cpu::write( nes_addr_t addr, int value )
} }
// status flags // status flags
extern uint8_t clock_table [256]; uint8_t clock_table [256] = {
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
7,6,2,8,3,3,5,5,3,2,2,2,4,4,6,6,// 0
3,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,// 1
6,6,2,8,3,3,5,5,4,2,2,2,4,4,6,6,// 2
3,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,// 3
6,6,2,8,3,3,5,5,3,2,2,2,3,4,6,6,// 4
3,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,// 5
6,6,2,8,3,3,5,5,4,2,2,2,5,4,6,6,// 6
3,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,// 7
2,6,2,6,3,3,3,3,2,2,2,2,4,4,4,4,// 8
3,6,2,6,4,4,4,4,2,5,2,5,5,5,5,5,// 9
2,6,2,6,3,3,3,3,2,2,2,2,4,4,4,4,// A
3,5,2,5,4,4,4,4,2,4,2,4,4,4,4,4,// B
2,6,2,8,3,3,5,5,2,2,2,2,4,4,6,6,// C
3,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,// D
2,6,2,8,3,3,5,5,2,2,2,2,4,4,6,6,// E
3,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7 // F
};
__attribute__((optimize("align-functions=" _PAGE_SIZE))) __attribute__((optimize("align-functions=" _PAGE_SIZE)))
Cpu::result_t Cpu::run ( nes_time_t end ) Cpu::result_t Cpu::run ( nes_time_t end )
@ -1148,24 +1168,5 @@ end:
return result; return result;
} }
uint8_t clock_table [256] = {
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
7,6,2,8,3,3,5,5,3,2,2,2,4,4,6,6,// 0
3,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,// 1
6,6,2,8,3,3,5,5,4,2,2,2,4,4,6,6,// 2
3,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,// 3
6,6,2,8,3,3,5,5,3,2,2,2,3,4,6,6,// 4
3,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,// 5
6,6,2,8,3,3,5,5,4,2,2,2,5,4,6,6,// 6
3,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,// 7
2,6,2,6,3,3,3,3,2,2,2,2,4,4,4,4,// 8
3,6,2,6,4,4,4,4,2,5,2,5,5,5,5,5,// 9
2,6,2,6,3,3,3,3,2,2,2,2,4,4,4,4,// A
3,5,2,5,4,4,4,4,2,4,2,4,4,4,4,4,// B
2,6,2,8,3,3,5,5,2,2,2,2,4,4,6,6,// C
3,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,// D
2,6,2,8,3,3,5,5,2,2,2,2,4,4,6,6,// E
3,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7 // F
};
} // namespace quickNES } // namespace quickNES