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| author | Rangi <remy.oukaour+rangi42@gmail.com> | 2020-08-26 12:17:38 -0400 |
|---|---|---|
| committer | Rangi <remy.oukaour+rangi42@gmail.com> | 2020-08-26 12:17:38 -0400 |
| commit | 0d81816cab9d4210bd4f55211ed6026c3f6a786e (patch) | |
| tree | 698e19d59301f96ce46eef2130a092cfae2f0165 /Optimizing-assembly-code.md | |
| parent | d5c6ded4bf89ffa44805d58f373b946488a64f25 (diff) | |
carry
Diffstat (limited to 'Optimizing-assembly-code.md')
| -rw-r--r-- | Optimizing-assembly-code.md | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Optimizing-assembly-code.md b/Optimizing-assembly-code.md index 93fa03a..8346020 100644 --- a/Optimizing-assembly-code.md +++ b/Optimizing-assembly-code.md @@ -277,7 +277,7 @@ If `CVAL` is $FF (i.e. set `a` to $FF if carry), then do: ```asm ; 3 bytes, 3 cycles sbc a ; if carry, then $ff, else 0 - or NCVAL ; $ff stays $ff, $00 becomes NCVAL + or NCVAL ; $ff stays $ff, $00 becomes NCVAL; omit this if NCVAL is 0 ``` If `NCVAL` is $FF (i.e. set `a` to $FF if not carry), invert carry and do the same: @@ -286,7 +286,7 @@ If `NCVAL` is $FF (i.e. set `a` to $FF if not carry), invert carry and do the sa ; 4 bytes, 4 cycles ccf ; invert carry flag sbc a ; if originally carry, then 0, else $ff - or CVAL ; $00 becomes CVAL, $ff stays $ff + or CVAL ; $00 becomes CVAL, $ff stays $ff; omit this if CVAL is 0 ``` If `CVAL` equals `NCVAL - 1`, then do: |