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James Gregory 2013-12-31 11:38:48 +11:00
commit f658bfbb40
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09-05.md
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@ -43,38 +43,39 @@ one.
**LISTING 9.4 L9-4.ASM**
.
;--------------------------------------------------------------------------
; Sorts an array of ints. C callable (small model). 25 bytes.
; void sort( int num, int a[] );
;
; Courtesy of David Stafford.
;--------------------------------------------------------------------------
```nasm
;--------------------------------------------------------------------------
; Sorts an array of ints. C callable (small model). 25 bytes.
; void sort( int num, int a[] );
;
; Courtesy of David Stafford.
;--------------------------------------------------------------------------
.model small
.code
public _sort
.model small
.code
public _sort
top: mov dx,[bx] ;swap two adjacent integers
xchg dx,[bx+2]
xchg dx,[bx]
cmp dx,[bx] ;did we put them in the right order?
jl top ;no, swap them back
inc bx ;go to next integer
inc bx
loop top
_sort: pop dx ;get return address (entry point)
pop cx ;get count
pop bx ;get pointer
push bx ;restore pointer
dec cx ;decrement count
push cx ;save count
push dx ;restore return address
jg top ;if cx > 0
top: mov dx,[bx] ;swap two adjacent integers
xchg dx,[bx+2]
xchg dx,[bx]
cmp dx,[bx] ;did we put them in the right order?
jl top ;no, swap them back
inc bx ;go to next integer
inc bx
loop top
_sort: pop dx ;get return address (entry point)
pop cx ;get count
pop bx ;get pointer
push bx ;restore pointer
dec cx ;decrement count
push cx ;save count
push dx ;restore return address
jg top ;if cx > 0
ret
ret
end
end
```
#### Full 32-Bit Division {#Heading8}