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Fixed the comments to say where the actual Left-Hand Side and Right-Hand Side are put.

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A description of positions [left, right] is appropriate more for C code than for Assembly code.  (A description of timing [first argument, second argument] is more appropriate for the way that Assembly code is written.)
This commit is contained in:
Greg King
2014-05-11 10:43:06 -04:00
parent 228b9d1718
commit f82a43b98d
5 changed files with 20 additions and 24 deletions
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14
libsrc/runtime/umul8x8r16.s
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@@ -1,7 +1,7 @@
;
; Ullrich von Bassewitz, 2010-11-02
;
; CC65 runtime: 8x8 => 16 multiplication
; CC65 runtime: 8x8 => 16 unsigned multiplication
;
.export umul8x8r16, umul8x8r16m
@@ -9,11 +9,11 @@
;---------------------------------------------------------------------------
; 8x8 => 16 multiplication routine.
; 8x8 => 16 unsigned multiplication routine.
;
; lhs rhs result result also in
; LHS RHS result result in also
; -------------------------------------------------------------
; ptr1-lo ptr3-lo ax ptr1
; .A (ptr3-low) ptr1-low .XA ptr1
;
umul8x8r16:
@@ -21,7 +21,7 @@ umul8x8r16:
umul8x8r16m:
lda #0 ; Clear byte 1
ldy #8 ; Number of bits
lsr ptr1 ; Get first bit of lhs into carry
lsr ptr1 ; Get first bit of RHS into carry
@L0: bcc @L1
clc
adc ptr3
@@ -30,8 +30,6 @@ umul8x8r16m:
dey
bne @L0
tax
stx ptr1+1 ; Result in a/x and ptr1
stx ptr1+1 ; Result in .XA and ptr1
lda ptr1 ; Load the result
rts ; Done