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Fix MultiplyNumbers macro #3

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Fix MultiplyNumbers macro #3

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11 changes: 6 additions & 5 deletions gbasmdev.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -376,10 +376,11 @@ \section{Loops}
push bc ; lets us use B register
; without messing up existing data,
; as it is restored before we return
ld c, a

ld b, 11 ; the number of times we loop
ld b, 10 ; the number of times we loop
.loop:
add a ; add A onto itself
add c ; add the original value (in C) onto A
dec b ; decrease loop counter
jr nz, .loop ; if didn't reach zero, go back
; If we got here, the loop is finished
Expand Down Expand Up @@ -507,10 +508,10 @@ \section{Compile time operations}

\begin{code}
MultiplyNumbers: MACRO
ld a, \1
ld b, \2
ld bc, (\2) << 8 | (\1)
xor a
.loop\@:
add a
add c
dec b
jr nz, .loop\@
\end{code}
Expand Down