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cpu: Sprinkle a few cycles here and there

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Probably still missing the odd cycles

Signed-off-by: Michel Pollet <buserror@gmail.com>
This commit is contained in:
Michel Pollet 2023-10-28 16:57:30 +01:00
parent cdca612df2
commit f9f5cbbd0e
1 changed files with 8 additions and 7 deletions
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15
src/mii_65c02.c
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@ -233,10 +233,10 @@ next_instruction:
{ // BCC, BCS, BEQ, BMI, BNE, BPL, BVC, BVS
if (d.s_bit_value == cpu->P.P[d.s_bit]) {
cpu->_P = cpu->PC + (int8_t)cpu->_P;
cpu->cycle++;
if ((cpu->_P & 0xff00) != (cpu->PC & 0xff00))
cpu->cycle++;
cpu->PC = cpu->_P;
cpu->cycle++;
}
} break;
case 0x80:
@ -361,6 +361,7 @@ next_instruction:
} break;
case 0xEA:
{ // NOP
cpu->cycle++;
} break;
case 0x09: case 0x05: case 0x15: case 0x0D: case 0x1D:
case 0x19: case 0x01: case 0x11: case 0x12:
@ -521,31 +522,31 @@ next_instruction:
} break;
case 0xAA:
{ // TAX
cpu->X = cpu->A;
cpu->X = cpu->A;cpu->cycle++;
_NZ(cpu->X);
} break;
case 0xA8:
{ // TAY
cpu->Y = cpu->A;
cpu->Y = cpu->A;cpu->cycle++;
_NZ(cpu->Y);
} break;
case 0xBA:
{ // TSX
cpu->X = cpu->S;
cpu->X = cpu->S;cpu->cycle++;
_NZ(cpu->X);
} break;
case 0x8A:
{ // TXA
cpu->A = cpu->X;
cpu->A = cpu->X;cpu->cycle++;
_NZ(cpu->A);
} break;
case 0x9A:
{ // TXS
cpu->S = cpu->X;
cpu->S = cpu->X;cpu->cycle++;
} break;
case 0x98:
{ // TYA
cpu->A = cpu->Y;
cpu->A = cpu->Y;cpu->cycle++;
_NZ(cpu->A);
} break;
case 0x07: case 0x17: case 0x27: case 0x37: case 0x47: