BFFFO undocumented behavior.

diff --git a/gencpu.cpp b/gencpu.cpp
index e8a2aa6c66d36baee0ce0a6e5cf4cb289f98f814..e52660e3cbbcc247c7d6ae60232a7e1ac1f001c3 100644 (file)
--- a/gencpu.cpp
+++ b/gencpu.cpp
@@ -5007,14 +5007,17 @@ bccl_not68020:
        case i_BKPT:            /* only needed for hardware emulators */
                sync_m68k_pc ();
                printf ("\top_illg (opcode);\n");
+               did_prefetch = -1;
                break;
        case i_CALLM:           /* not present in 68030 */
                sync_m68k_pc ();
                printf ("\top_illg (opcode);\n");
+               did_prefetch = -1;
                break;
        case i_RTM:             /* not present in 68030 */
                sync_m68k_pc ();
                printf ("\top_illg (opcode);\n");
+               did_prefetch = -1;
                break;
        case i_TRAPcc:
                if (curi->smode != am_unknown && curi->smode != am_illg)
@@ -5065,6 +5068,8 @@ bccl_not68020:
                        printf ("\tuae_u32 bdata[2];\n");
                        printf ("\tuae_s32 offset = extra & 0x800 ? m68k_dreg(regs, (extra >> 6) & 7) : (extra >> 6) & 0x1f;\n");
                        printf ("\tint width = (((extra & 0x20 ? m68k_dreg(regs, extra & 7) : extra) -1) & 0x1f) +1;\n");
+                       if (curi->mnemo == i_BFFFO)
+                               printf("\tuae_u32 offset2 = offset;\n");
                        if (curi->dmode == Dreg) {
                                printf ("\tuae_u32 tmp = m68k_dreg(regs, dstreg);\n");
                                printf ("\toffset &= 0x1f;\n");
@@ -5096,8 +5101,8 @@ bccl_not68020:
                                break;
                        case i_BFFFO:
                                printf ("\t{ uae_u32 mask = 1 << (width - 1);\n");
-                               printf ("\twhile (mask) { if (tmp & mask) break; mask >>= 1; offset++; }}\n");
-                               printf ("\tm68k_dreg (regs, (extra >> 12) & 7) = offset;\n");
+                               printf ("\twhile (mask) { if (tmp & mask) break; mask >>= 1; offset2++; }}\n");
+                               printf ("\tm68k_dreg (regs, (extra >> 12) & 7) = offset2;\n");
                                break;
                        case i_BFSET:
                                printf ("\ttmp = 0xffffffffu >> (32 - width);\n");