ba237a9d91
Files correlati : Ricompilazione Demo : [ ] Commento : Aggiunti i sorgenti per Greenleaf Math Library (gfm.dll) git-svn-id: svn://10.65.10.50/trunk@10079 c028cbd2-c16b-5b4b-a496-9718f37d4682
75 lines
1.7 KiB
NASM
Executable File
75 lines
1.7 KiB
NASM
Executable File
; int _DoubleUnsArr(a,n)
|
|
;
|
|
; ARGUMENT
|
|
; unsigned *a[];
|
|
; unsigned n;
|
|
;
|
|
; DESCRIPTION
|
|
; Doubles the number a (taken as one number of 'n' 16-bit unsigned's).
|
|
;
|
|
; SIDE EFFECTS
|
|
; Overflow if sign bit goes set in high-order unsigned
|
|
;
|
|
; RETURNS
|
|
; None, athough they are set in AX for future use if needed
|
|
;
|
|
; AUTHOR
|
|
; Andy Anderson 31-JAN-1987 14:45
|
|
; Copyright (C) 1987-90 Greenleaf Software Inc. All Rights Reserved.
|
|
;
|
|
; MODIFICATIONS
|
|
;
|
|
;
|
|
;
|
|
include model.h
|
|
include prologue.h
|
|
include gm.equ
|
|
|
|
|
|
pseg gmath
|
|
;
|
|
;
|
|
; if large memory model then:
|
|
;
|
|
; parm1_ = ptr to source 1
|
|
; parm3_ = number of words to shift left (multipy by 2)
|
|
;
|
|
; for if small model then
|
|
; parm1_ = ptr to source1
|
|
; parm2_ = number of words to shift left (multipy by 2)
|
|
;
|
|
;
|
|
|
|
cproc _DoubleUnsArr,,_dmi
|
|
if _LDATA
|
|
push ds
|
|
lds si,parm1_ ; ptr to a
|
|
mov cx,parm3_ ; get number of words to shift
|
|
else
|
|
mov si,parm1_
|
|
mov cx,parm2_ ; ditto for small model
|
|
endif
|
|
|
|
xor ax,ax ; clear flags
|
|
lp:
|
|
rcl Word Ptr [si],1 ; word and multipy it by 2
|
|
inc si ; and increase the index (offset)
|
|
inc si ; without disturbing the carry
|
|
loop lp ; for next until done
|
|
|
|
jc overf ; carry-out is overflow and
|
|
|
|
test [si-2],8000h ; overflow if high-order set
|
|
jnz overf
|
|
mov ax,GM_SUCCESS ; otherwise no overflow
|
|
exit:
|
|
if _LDATA
|
|
pop ds
|
|
endif
|
|
cproce
|
|
overf:
|
|
mov ax,GM_FAILURE
|
|
jmp short exit
|
|
endps
|
|
END
|