Mercurial > public > hwos_code
diff src/math.asm @ 628:cd58f7fc86db
3.05 stable work
| author | heinrichsweikamp |
|---|---|
| date | Thu, 19 Sep 2019 12:01:29 +0200 |
| parents | c40025d8e750 |
| children | 4050675965ea |
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--- a/src/math.asm Sun Jun 30 23:22:32 2019 +0200 +++ b/src/math.asm Thu Sep 19 12:01:29 2019 +0200 @@ -1,6 +1,6 @@ ;============================================================================= ; -; File math.asm combined next generation V3.03.2 +; File math.asm combined next generation V3.04.3 ; ; Math subroutines ; @@ -54,6 +54,18 @@ return ; YES - done + global addU16 ; ; sub_c:2 = sub_a:2 + sub_b:2 with USIGNED values + ; trashes WREG +addU16: + movf sub_a+0,W ; get 1st summand (low byte) to WREG + addwf sub_b+0,W ; add 2nd summand (low byte) and store result in WREG + movwf sub_c+0 ; copy result (low byte) to sub_c + movf sub_a+1,W ; get 1st summand (high byte) to WREG + addwfc sub_b+1,W ; add 2nd summand (high byte) and store result in WREG + movwf sub_c+1 ; copy result (high byte) to sub_c + return ; done + + global sub16 ; sub_c:2 = sub_a:2 - sub_b:2 with SIGNED values ; sets neg_flag if result is < 0 ; trashes WREG