bilbo/advent-of-sh
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

parse_base10: add digit count

Browse Source
This commit is contained in:
Zack Buhman 2024-04-09 09:47:53 +08:00
parent 8fbaa207c5
commit 98746b4fb4
1 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
common/parse_base10.s
View File

@ -3,7 +3,10 @@
.global _parse_base10 .global _parse_base10
_parse_base10: _parse_base10:
/* r8 = pointer to text ; r1 = number */ /* r8 = pointer to text ; r1 = number */
/* return r0 = number of digits */
mov #0,r1 /* r1: accumulated number */ mov #0,r1 /* r1: accumulated number */
mov r8,r0 /* r0: number of digits */
add #1,r0
parse_base10_loop: parse_base10_loop:
mov.b @r8+,r2 mov.b @r8+,r2
add #-48,r2 /* ascii '0' */ add #-48,r2 /* ascii '0' */
@ -18,5 +21,6 @@ parse_base10_loop:
bra parse_base10_loop bra parse_base10_loop
add r2,r1 add r2,r1
parse_base10_rts: parse_base10_rts:
sub r8,r0
rts rts
nop neg r0,r0