FAMEC idle loops, PSP port sync, minor adjustments

[picodrive.git] / cpu / fame / famec_opcodes.h

diff --git a/cpu/fame/famec_opcodes.h b/cpu/fame/famec_opcodes.h
index 03a64de..e1e1e45 100644 (file)
--- a/cpu/fame/famec_opcodes.h
+++ b/cpu/fame/famec_opcodes.h
@@ -39961,3 +39961,101 @@ OPCODE(0xE7E7)
 RET(14)
 }
 
+#ifdef PICODRIVE_HACK
+// BRA
+OPCODE(0x6001_idle)
+{
+#ifdef FAMEC_CHECK_BRANCHES
+       u32 newPC = (u32)(PC) - BasePC;
+       s8 offs=Opcode;
+       newPC += offs;
+       SET_PC(newPC);
+       CHECK_BRANCH_EXCEPTION(offs)
+#else
+       PC += ((s8)(Opcode & 0xFE)) >> 1;
+#endif
+       {
+               extern int idle_hit_counter;
+               idle_hit_counter++;
+       }
+       m68kcontext.io_cycle_counter = 10;
+RET(10)
+}
+
+// BCC
+OPCODE(0x6601_idle)
+{
+       if (flag_NotZ)
+       {
+               extern int idle_hit_counter;
+               idle_hit_counter++;
+               PC += ((s8)(Opcode & 0xFE)) >> 1;
+               m68kcontext.io_cycle_counter = 8;
+       }
+RET(8)
+}
+
+OPCODE(0x6701_idle)
+{
+       if (!flag_NotZ)
+       {
+               extern int idle_hit_counter;
+               idle_hit_counter++;
+               PC += ((s8)(Opcode & 0xFE)) >> 1;
+               m68kcontext.io_cycle_counter = 8;
+       }
+RET(8)
+}
+
+
+extern int SekIsIdleCode(unsigned short *dst, int bytes);
+extern int SekRegisterIdlePatch(unsigned int pc, int oldop, int newop);
+
+OPCODE(idle_detector_bcc8)
+{
+       extern int idledet_start_frame;
+       extern char Pico[];
+       int frame_count, cond_true, bytes, ret, newop;
+       u16 *dest_pc;
+
+       dest_pc = PC + (((s8)(Opcode & 0xFE)) >> 1);
+
+       frame_count = *(int *)(Pico+0x22208+0x1c); // Pico.m.frame_count
+       if (frame_count < idledet_start_frame)
+               goto end;
+
+       bytes = 0 - (s8)(Opcode & 0xFE) - 2;
+       ret = SekIsIdleCode(dest_pc, bytes);
+       newop = (Opcode & 0xfe) | 0x7100;
+       if (!ret) newop |= 0x200;
+       if (Opcode & 0x0100) newop |= 0x400; // beq
+
+       ret = SekRegisterIdlePatch(GET_PC - 2, Opcode, newop);
+       switch (ret)
+       {
+               case 0: PC[-1] = newop; break;
+               case 1: break;
+               case 2: JumpTable[Opcode] = (Opcode & 0x0100) ? CAST_OP(0x6701) : CAST_OP(0x6601); break;
+       }
+
+end:
+       cond_true = (Opcode & 0x0100) ? !flag_NotZ : flag_NotZ; // beq?
+       if (cond_true)
+       {
+               PC = dest_pc;
+               m68kcontext.io_cycle_counter -= 2;
+       }
+RET(8)
+}
+
+OPCODE(idle_detector_dead)
+{
+       // patch without further questions
+       int newop = 0x7d00 | (Opcode & 0xff);
+       PC[-1] = newop;
+       SekRegisterIdlePatch(GET_PC - 2, Opcode, newop);
+
+       PC += ((s8)(Opcode & 0xFE)) >> 1;
+RET(10)
+}
+#endif // PICODRIVE_HACK