Mercurial > repos > blastem
diff runtime.S @ 612:5a6ff0d76032
Removed bcd_add and bcd_sub from runtime.S and generated the logic inline with the rest of abcd and sbcd translation. Fixed some edge cases and undefined flag behavior in the process
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Sun, 28 Dec 2014 17:25:36 -0800 |
| parents | 3090d016c9e9 |
| children | 7ed1dbb48f61 |
line wrap: on
line diff
--- a/runtime.S Sat Dec 27 15:49:15 2014 -0800 +++ b/runtime.S Sun Dec 28 17:25:36 2014 -0800 @@ -12,63 +12,5 @@ mov $1, %rdi call exit - .global bcd_add -bcd_add: - xchg %rax, %rdi - - mov %cl, %ch - mov %al, %ah - and $0xF, %ch - and $0xF, %ah - and $0xF0, %cl - and $0xF0, %al - add %ah, %ch - cmp $10, %ch - jb no_adjust - add $6, %ch -no_adjust: - add %ch, %al - add %al, %cl - mov $0, %ch - jc def_adjust - cmp $0xA0, %cl - jb no_adjust_h -def_adjust: - add $0x60, %cl - mov $1, %ch -no_adjust_h: - - mov %rdi, %rax - ret - - .global bcd_sub -bcd_sub: - xchg %rax, %rdi - - mov %cl, %ch - mov %al, %ah - and $0xF, %ch - and $0xF, %ah - and $0xF0, %cl - and $0xF0, %al - sub %ah, %ch - cmp $10, %ch - jb no_adjusts - sub $6, %ch -no_adjusts: - add %ch, %cl - sub %al, %cl - mov $0, %ch - jc def_adjusts - cmp $0xA0, %cl - jb no_adjust_hs -def_adjusts: - sub $0x60, %cl - mov $1, %ch -no_adjust_hs: - - mov %rdi, %rax - ret -