/* Branch Instructions *********************************************************************** */
#ifndef SA1_OPCODES
#define BranchCheck0()\
- if( CPU.BranchSkip)\
+ if (CPU.BranchSkip)\
{\
- CPU.BranchSkip = FALSE;\
- if (!Settings.SoundSkipMethod)\
- if( CPU.PC - CPU.PCBase > OpAddress)\
- return;\
+ CPU.BranchSkip = FALSE;\
+ if (!Settings.SoundSkipMethod)\
+ if( CPU.PC - CPU.PCBase > OpAddress)\
+ return;\
}
#define BranchCheck1()\
- if( CPU.BranchSkip)\
+ if (CPU.BranchSkip)\
{\
- CPU.BranchSkip = FALSE;\
- if (!Settings.SoundSkipMethod) {\
- if( CPU.PC - CPU.PCBase > OpAddress)\
- return;\
- } else \
- if (Settings.SoundSkipMethod == 1)\
- return;\
- if (Settings.SoundSkipMethod == 3)\
- if( CPU.PC - CPU.PCBase > OpAddress)\
- return;\
- else\
- CPU.PC = CPU.PCBase + OpAddress;\
- }
+ CPU.BranchSkip = FALSE;\
+ if (!Settings.SoundSkipMethod) {\
+ if( CPU.PC - CPU.PCBase > OpAddress)\
+ return;\
+ } else if (Settings.SoundSkipMethod == 1) {\
+ return;\
+ } else if (Settings.SoundSkipMethod == 3) {\
+ if( CPU.PC - CPU.PCBase > OpAddress)\
+ return;\
+ else\
+ CPU.PC = CPU.PCBase + OpAddress;\
+ }\
+ }
#define BranchCheck2()\
- if( CPU.BranchSkip)\
+ if (CPU.BranchSkip)\
{\
- CPU.BranchSkip = FALSE;\
- if (!Settings.SoundSkipMethod) {\
- if( CPU.PC - CPU.PCBase > OpAddress)\
- return;\
- } else \
- if (Settings.SoundSkipMethod == 1)\
- CPU.PC = CPU.PCBase + OpAddress;\
- if (Settings.SoundSkipMethod == 3)\
- if (CPU.PC - CPU.PCBase > OpAddress)\
- return;\
- else\
- CPU.PC = CPU.PCBase + OpAddress;\
+ CPU.BranchSkip = FALSE;\
+ if (!Settings.SoundSkipMethod) {\
+ if( CPU.PC - CPU.PCBase > OpAddress)\
+ return;\
+ } else if (Settings.SoundSkipMethod == 1) {\
+ CPU.PC = CPU.PCBase + OpAddress;\
+ } else if (Settings.SoundSkipMethod == 3) {\
+ if (CPU.PC - CPU.PCBase > OpAddress)\
+ return;\
+ else\
+ CPU.PC = CPU.PCBase + OpAddress;\
+ }\
}
+
#else
#define BranchCheck0()
#define BranchCheck1()
// Reserved S9xOpcode
static void Op42 ()
{
-#if defined(CPU_SHUTDOWN) && !defined(SA1_OPCODES)\r
-\r
- CPU.WaitAddress = NULL;\r
- if (Settings.SA1) S9xSA1ExecuteDuringSleep ();\r
-\r
- ApuSync();\r\r#ifdef VAR_CYCLES\r
- CPU.Cycles += CPU.MemSpeed;\r
+#if defined(CPU_SHUTDOWN) && !defined(SA1_OPCODES)
+
+ CPU.WaitAddress = NULL;
+ if (Settings.SA1) S9xSA1ExecuteDuringSleep ();
+
+ ApuSync();\r\r#ifdef VAR_CYCLES
+ CPU.Cycles += CPU.MemSpeed;
#endif
//relative
int8 b = *CPU.PC;
CPU.PC++;
- int8 BranchOffset = ((b & 0xF) | 0xF0);\r
- uint16 OpAddress = (int)(CPU.PC - CPU.PCBase) + BranchOffset;\r
+ int8 BranchOffset = ((b & 0xF) | 0xF0);
+ uint16 OpAddress = (int)(CPU.PC - CPU.PCBase) + BranchOffset;
// Assume we're going to branch
-#ifdef VAR_CYCLES\r
- CPU.Cycles += ONE_CYCLE;\r
+#ifdef VAR_CYCLES
+ CPU.Cycles += ONE_CYCLE;
#else
- CPU.Cycles++;\r
+ CPU.Cycles++;
#endif
-\r
- switch (b >> 4) {\r
- case 0x1: //BPL\r
- BranchCheck1 ();\r
- if (!CheckNegative ()) {\r
+
+ switch (b >> 4) {
+ case 0x1: //BPL
+ BranchCheck1 ();
+ if (!CheckNegative ()) {
CPU.PC = CPU.PCBase + OpAddress;
-# ifdef VAR_CYCLES\r
- CPU.Cycles += ONE_CYCLE;\r
+# ifdef VAR_CYCLES
+ CPU.Cycles += ONE_CYCLE;
# else
- CPU.Cycles++;\r
-# endif\r
- CPUShutdown ();\r
- }\r
- return;\r
- case 0x3: //BMI\r
- BranchCheck1 ();\r
- if (CheckNegative ()) {\r
- CPU.PC = CPU.PCBase + OpAddress;\r
-# ifdef VAR_CYCLES\r
- CPU.Cycles += ONE_CYCLE;\r
+ CPU.Cycles++;
+# endif
+ CPUShutdown ();
+ }
+ return;
+ case 0x3: //BMI
+ BranchCheck1 ();
+ if (CheckNegative ()) {
+ CPU.PC = CPU.PCBase + OpAddress;
+# ifdef VAR_CYCLES
+ CPU.Cycles += ONE_CYCLE;
# else
- CPU.Cycles++;\r
-# endif\r
- CPUShutdown ();\r
- }\r
- return;\r
- case 0x5: //BVC\r
- BranchCheck0 ();\r
- if (!CheckOverflow ()) {\r
- CPU.PC = CPU.PCBase + OpAddress;\r
-# ifdef VAR_CYCLES\r
- CPU.Cycles += ONE_CYCLE;\r
+ CPU.Cycles++;
+# endif
+ CPUShutdown ();
+ }
+ return;
+ case 0x5: //BVC
+ BranchCheck0 ();
+ if (!CheckOverflow ()) {
+ CPU.PC = CPU.PCBase + OpAddress;
+# ifdef VAR_CYCLES
+ CPU.Cycles += ONE_CYCLE;
# else
- CPU.Cycles++;\r
-# endif\r
- CPUShutdown ();\r
- }\r
- return;\r
- case 0x7: //BVS\r
- BranchCheck0 ();\r
- if (CheckOverflow ()) {\r
- CPU.PC = CPU.PCBase + OpAddress;\r
-# ifdef VAR_CYCLES\r
- CPU.Cycles += ONE_CYCLE;\r
+ CPU.Cycles++;
+# endif
+ CPUShutdown ();
+ }
+ return;
+ case 0x7: //BVS
+ BranchCheck0 ();
+ if (CheckOverflow ()) {
+ CPU.PC = CPU.PCBase + OpAddress;
+# ifdef VAR_CYCLES
+ CPU.Cycles += ONE_CYCLE;
# else
- CPU.Cycles++;\r
-# endif\r
- CPUShutdown ();\r
- }\r
- return;\r
- case 0x8: //BRA\r
- CPU.PC = CPU.PCBase + OpAddress;\r
-# ifdef VAR_CYCLES\r
- CPU.Cycles += ONE_CYCLE;\r
+ CPU.Cycles++;
+# endif
+ CPUShutdown ();
+ }
+ return;
+ case 0x8: //BRA
+ CPU.PC = CPU.PCBase + OpAddress;
+# ifdef VAR_CYCLES
+ CPU.Cycles += ONE_CYCLE;
# else
- CPU.Cycles++;\r
-# endif\r
- CPUShutdown ();\r
- return;\r
- case 0x9: //BCC\r
- BranchCheck0 ();\r
- if (!CheckCarry ()) {\r
- CPU.PC = CPU.PCBase + OpAddress;\r
-# ifdef VAR_CYCLES\r
- CPU.Cycles += ONE_CYCLE;\r
+ CPU.Cycles++;
+# endif
+ CPUShutdown ();
+ return;
+ case 0x9: //BCC
+ BranchCheck0 ();
+ if (!CheckCarry ()) {
+ CPU.PC = CPU.PCBase + OpAddress;
+# ifdef VAR_CYCLES
+ CPU.Cycles += ONE_CYCLE;
# else
- CPU.Cycles++;\r
-# endif\r
- CPUShutdown ();\r
- }\r
- return;\r
- case 0xB: //BCS\r
- BranchCheck0 ();\r
- if (CheckCarry ()) {\r
- CPU.PC = CPU.PCBase + OpAddress;\r
-# ifdef VAR_CYCLES\r
- CPU.Cycles += ONE_CYCLE;\r
+ CPU.Cycles++;
+# endif
+ CPUShutdown ();
+ }
+ return;
+ case 0xB: //BCS
+ BranchCheck0 ();
+ if (CheckCarry ()) {
+ CPU.PC = CPU.PCBase + OpAddress;
+# ifdef VAR_CYCLES
+ CPU.Cycles += ONE_CYCLE;
# else
- CPU.Cycles++;\r
-# endif\r
- CPUShutdown ();\r
- }\r
- return;\r
- case 0xD: //BNE\r
- BranchCheck1 ();\r
- if (!CheckZero ()) {\r
- CPU.PC = CPU.PCBase + OpAddress;\r
-# ifdef VAR_CYCLES\r
- CPU.Cycles += ONE_CYCLE;\r
+ CPU.Cycles++;
+# endif
+ CPUShutdown ();
+ }
+ return;
+ case 0xD: //BNE
+ BranchCheck1 ();
+ if (!CheckZero ()) {
+ CPU.PC = CPU.PCBase + OpAddress;
+# ifdef VAR_CYCLES
+ CPU.Cycles += ONE_CYCLE;
# else
- CPU.Cycles++;\r
-# endif\r
- CPUShutdown ();\r
- }\r
- return;\r
- case 0xF: //BEQ\r
- BranchCheck2 ();\r
- if (CheckZero ()) {\r
- CPU.PC = CPU.PCBase + OpAddress;\r
-# ifdef VAR_CYCLES\r
- CPU.Cycles += ONE_CYCLE;\r
+ CPU.Cycles++;
+# endif
+ CPUShutdown ();
+ }
+ return;
+ case 0xF: //BEQ
+ BranchCheck2 ();
+ if (CheckZero ()) {
+ CPU.PC = CPU.PCBase + OpAddress;
+# ifdef VAR_CYCLES
+ CPU.Cycles += ONE_CYCLE;
# else
- CPU.Cycles++;\r
-# endif\r
- CPUShutdown ();\r
- }\r
+ CPU.Cycles++;
+# endif
+ CPUShutdown ();
+ }
return;
#ifdef DEBUG
default:
printf("Invalid Op42 branch type %hx\n", b >> 4);
return;
-#endif\r
- }\r
+#endif
+ }
#endif
}
projects / drnoksnes / blobdiff