Mercurial > repos > blastem
changeset 2671:e0935d5878c3
Fix some cycle timing issues in the new 68K core
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Sat, 08 Mar 2025 19:57:23 -0800 |
| parents | 9bcfdc1b56bd |
| children | 6894a25ebfaa |
| files | m68k.cpu |
| diffstat | 1 files changed, 70 insertions(+), 0 deletions(-) [+] |
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--- a/m68k.cpu Sat Mar 08 18:56:57 2025 -0800 +++ b/m68k.cpu Sat Mar 08 19:57:23 2025 -0800 @@ -461,6 +461,25 @@ invalid M 7 R 7 invalid Z 3 m68k_fetch_src_ea M R Z + if Z = 2 + switch M + case 0 + #dreg src + cycles 4 + case 1 + #areg src + cycles 4 + case 7 + if R = 4 + #immediate + cycles 4 + else + cycles 2 + end + default + cycles 2 + end + end add src dregs.D dregs.D Z update_flags XNZVC @@ -572,6 +591,12 @@ m68k_fetch_dst_ea M R Z switch M + case 0 + if Z = 2 + cycles 4 + end + add src dst dst Z + update_flags XNZVC case 1 cycles 4 add src dst dst 2 @@ -681,6 +706,25 @@ invalid M 7 R 7 invalid Z 3 m68k_fetch_src_ea M R Z + if Z = 2 + switch M + case 0 + #dreg src + cycles 4 + case 1 + #areg src + cycles 4 + case 7 + if R = 4 + #immediate + cycles 4 + else + cycles 2 + end + default + cycles 2 + end + end and src dregs.D dregs.D Z update_flags NZV0C0 @@ -1218,6 +1262,25 @@ invalid M 7 R 7 invalid Z 3 m68k_fetch_src_ea M R Z + if Z = 2 + switch M + case 0 + #dreg src + cycles 4 + case 1 + #areg src + cycles 4 + case 7 + if R = 4 + #immediate + cycles 4 + else + cycles 2 + end + default + cycles 2 + end + end sub src dregs.D dregs.D Z update_flags XNZVC @@ -1329,7 +1392,14 @@ m68k_fetch_dst_ea M R Z switch M + case 0 + if Z = 2 + cycles 4 + end + sub src dst dst Z + update_flags XNZVC case 1 + cycles 4 sub src dst dst 2 default sub src dst dst Z