MMX convert text to byte value.

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Roman

Joined: 21 Apr 2012
Posts: 2129

Roman 08 Sep 2026, 16:38

I write code but its big code. I want three or 4 asm commands.

Code:

txtV db '16' ; i have many numbers
intV db 0

tt2 db 48,48,48,48
tt3 db 10,0,0,0 

;do some mmx operations and get intV=16

movd mm0,dword [txtV]
psubb mm0,qword [tt2]
movd ecx,mm0
pmullw mm0,qword[tt3]
movd eax,mm0
add al,ch 
mov [intV],al ;intV=16

08 Sep 2026, 16:38

Roman

Joined: 21 Apr 2012
Posts: 2129

Roman 08 Sep 2026, 18:12

Code:

ttt db '16'
intV db 0

        sub word [ttt],0x3030
        movzx eax,byte [ttt]
        imul eax,10
        add al,[ttt+1]
        mov [intV],al

08 Sep 2026, 18:12

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 21091
Location: In your JS exploiting you and your system

revolution 08 Sep 2026, 18:30

Dor the limited set of two digit bcd inputs.

Code:

mov ax,word[bcd]
sub ax,'00'
imul ax,0x10a
mov [result],ah

bcd db '16'
result db ?

There ia also aad designed exactly for this task.

08 Sep 2026, 18:30

Roman

Joined: 21 Apr 2012
Posts: 2129

Roman 08 Sep 2026, 18:50

Quote:

mov ax,word[bcd]
sub ax,'00'
imul ax,0x10a
mov [result],ah

Wrong result.

08 Sep 2026, 18:50

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 21091
Location: In your JS exploiting you and your system

revolution 08 Sep 2026, 18:53

Wrong multiplier.

Code:

mov ax,word[bcd]
sub ax,'00'
imul ax,0xa01
mov [result],ah

bcd db '16'
result db ?

08 Sep 2026, 18:53

Roman

Joined: 21 Apr 2012
Posts: 2129

Roman 08 Sep 2026, 19:12

Intel was supposed to do it this way AAD

Code:

aad al,ah,0x30  ;= sub al,0x30 and sub ah,0x30 and p1*10+p2.  p1=al and p2=ah

08 Sep 2026, 19:12

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