1. to Pete or anyone with asm knowledge
I have this problem with some assembly code that I wrote.
This works:
PUSHA
CLD
(some calculations...)
MOV ESI,sprite_pointer
MOV EDI,screen_pointer
MOV ECX,x_dim
horizontal_loop:
LODSB
CMP AL,0
JE no_pixel
STOSB
JMP no_edi_inc
no_pixel:
INC EDI
no_edi_inc:
LOOP horizontal_loop
However, this does not work:
PUSHA
CLD
(some calculations...)
MOV ESI,sprite_pointer
MOV EDI,screen_pointer
MOV ECX,floor(x_dim/2)
horizontal_loop:
LODSW
CMP AL,0
JE low_no_pixel
STOSB
JMP low_no_edi_inc
low_no_pixel:
INC EDI
low_no_edi_inc:
MOV AL,AH
CMP AL,0
JE high_no_pixel
STOSB
JMP high_no_edi_inc
high_no_pixel:
INC EDI
high_no_edi_inc:
LOOP horizontal_loop
Note that I didn't write "floor(x_dim/2)" in the assembly code, the
values are poked into the routine from a procedure using the get_param()
data-system in asm.e. It didn't matter if I used the first code, as
soon as I tried to poke floor(x_dim/2) into the x_dim variable the
routine caused a CauseWay error. My question is, why ?
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