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|
/************************************************************************/
/* This file contains the BCC compiler helper functions */
/* Support for long arithmetic on big-endian (words-swapped) longs
* __laddb.o __landb.o __lcmpb.o __lcomb.o __ldecb.o __ldivb.o __ldivub.o
* __leorb.o __lincb.o __lmodb.o __lmodub.o __lmulb.o __lnegb.o __lorb.o
* __lslb.o __lsrb.o __lsrub.o __lsubb.o __ltstb.o
*/
#ifdef __AS386_16__
#asm
.text ! This is common to all.
.even
#endasm
/************************************************************************/
/* Function laddb */
#ifdef L___laddb
#asm
| laddb.s
.globl laddb
.globl laddub
laddb:
laddub:
add bx,2(di)
adc ax,(di)
ret
#endasm
#endif
/************************************************************************/
/* Function landb */
#ifdef L___landb
#asm
| landb.s
.globl landb
.globl landub
landb:
landub:
and ax,(di)
and bx,2(di)
ret
#endasm
#endif
/************************************************************************/
/* Function lcmpb */
#ifdef L___lcmpb
#asm
| lcmpb.s
| lcmpb, lcmpub don`t preserve ax
.globl lcmpb
.globl lcmpub
lcmpb:
lcmpub:
sub ax,(di) | don`t need to preserve ax
je LCMP_NOT_SURE
ret
.even
LCMP_NOT_SURE:
cmp bx,2(di)
jb LCMP_B_AND_LT | b (below) becomes lt (less than) as well
jge LCMP_EXIT | ge and already ae
| else make gt as well as a (above)
inc ax | clear ov and mi, set ne for greater than
LCMP_EXIT:
ret
.even
LCMP_B_AND_LT:
dec ax | clear ov, set mi and ne for less than
ret
#endasm
#endif
/************************************************************************/
/* Function lcomb */
#ifdef L___lcomb
#asm
| lcomb.s
.globl lcomb
.globl lcomub
lcomb:
lcomub:
not ax
not bx
ret
#endasm
#endif
/************************************************************************/
/* Function ldecb */
#ifdef L___ldecb
#asm
| ldecb.s
.globl ldecb
.globl ldecub
ldecb:
ldecub:
cmp 2(bx),*0
je LDEC_BOTH
dec 2(bx)
ret
.even
LDEC_BOTH:
dec 2(bx)
dec (bx)
ret
#endasm
#endif
/************************************************************************/
/* Function ldivb */
#ifdef L___ldivb
#asm
| ldivb.s
| ax:bx / (di):2(di), quotient ax:bx, remainder cx:di, dx not preserved
.globl ldivb
.extern ldivmod
ldivb:
xchg ax,bx
mov cx,2(di)
mov di,(di)
call ldivmod | bx:ax / di:cx, quot di:cx, rem bx:ax
xchg ax,di
xchg bx,cx
ret
#endasm
#endif
/************************************************************************/
/* Function ldivub */
#ifdef L___ldivub
#asm
| ldivub.s
| unsigned ax:bx / (di):2(di), quotient ax:bx,remainder cx:di, dx not preserved
.globl ldivub
.extern ludivmod
ldivub:
xchg ax,bx
mov cx,2(di)
mov di,(di)
call ludivmod | unsigned bx:ax / di:cx, quot di:cx, rem bx:ax
xchg ax,di
xchg bx,cx
ret
#endasm
#endif
/************************************************************************/
/* Function leorb */
#ifdef L___leorb
#asm
| leorb.s
.globl leorb
.globl leorub
leorb:
leorub:
xor ax,(di)
xor bx,2(di)
ret
#endasm
#endif
/************************************************************************/
/* Function lincb */
#ifdef L___lincb
#asm
| lincb.s
.globl lincb
.globl lincub
lincb:
lincub:
inc 2(bx)
je LINC_HIGH_WORD
ret
.even
LINC_HIGH_WORD:
inc (bx)
ret
#endasm
#endif
/************************************************************************/
/* Function lmodb */
#ifdef L___lmodb
#asm
| lmodb.s
| ax:bx % (di):2(di), remainder ax:bx, quotient cx:di, dx not preserved
.globl lmodb
.extern ldivmod
lmodb:
xchg ax,bx
mov cx,2(di)
mov di,(di)
call ldivmod | bx:ax / di:cx, quot di:cx, rem bx:ax
xchg ax,bx
xchg cx,di
ret
#endasm
#endif
/************************************************************************/
/* Function lmodub */
#ifdef L___lmodub
#asm
| lmodub.s
| unsigned ax:bx / (di):2(di), remainder ax:bx,quotient cx:di, dx not preserved
.globl lmodub
.extern ludivmod
lmodub:
xchg ax,bx
mov cx,2(di)
mov di,(di)
call ludivmod | unsigned bx:ax / di:cx, quot di:cx, rem bx:ax
xchg ax,bx
xchg cx,di
ret
#endasm
#endif
/************************************************************************/
/* Function lmulb */
#ifdef L___lmulb
#asm
| lmulb.s
| lmulb, lmulub don`t preserve cx, dx
.globl lmulb
.globl lmulub
lmulb:
lmulub:
mul 2(di)
xchg ax,bx
mov cx,ax
mul (di)
add bx,ax
mov ax,2(di)
mul cx
add bx,dx
xchg ax,bx
ret
#endasm
#endif
/************************************************************************/
/* Function lnegb */
#ifdef L___lnegb
#asm
| lnegb.s
.globl lnegb
.globl lnegub
lnegb:
lnegub:
neg ax
neg bx
sbb ax,*0
ret
#endasm
#endif
/************************************************************************/
/* Function lorb */
#ifdef L___lorb
#asm
| lorb.s
.globl lorb
.globl lorub
lorb:
lorub:
or ax,(di)
or bx,2(di)
ret
#endasm
#endif
/************************************************************************/
/* Function lslb */
#ifdef L___lslb
#asm
| lslb.s
| lslb, lslub don`t preserve cx
.globl lslb
.globl lslub
lslb:
lslub:
mov cx,di
jcxz LSL_EXIT
cmp cx,*32
jae LSL_ZERO
LSL_LOOP:
shl bx,*1
rcl ax,*1
loop LSL_LOOP
LSL_EXIT:
ret
.even
LSL_ZERO:
xor ax,ax
mov bx,ax
ret
#endasm
#endif
/************************************************************************/
/* Function lsrb */
#ifdef L___lsrb
#asm
| lsrb.s
| lsrb doesn`t preserve cx
.globl lsrb
lsrb:
mov cx,di
jcxz LSR_EXIT
cmp cx,*32
jae LSR_SIGNBIT
LSR_LOOP:
sar ax,*1
rcr bx,*1
loop LSR_LOOP
LSR_EXIT:
ret
.even
LSR_SIGNBIT:
mov cx,*32 | equivalent to +infinity in this context
j LSR_LOOP
#endasm
#endif
/************************************************************************/
/* Function lsrub */
#ifdef L___lsrub
#asm
| lsrub.s
| lsrub doesn`t preserve cx
.globl lsrub
lsrub:
mov cx,di
jcxz LSRU_EXIT
cmp cx,*32
jae LSRU_ZERO
LSRU_LOOP:
shr ax,*1
rcr bx,*1
loop LSRU_LOOP
LSRU_EXIT:
ret
.even
LSRU_ZERO:
xor ax,ax
mov bx,ax
ret
#endasm
#endif
/************************************************************************/
/* Function lsubb */
#ifdef L___lsubb
#asm
| lsubb.s
.globl lsubb
.globl lsubub
lsubb:
lsubub:
sub bx,2(di)
sbb ax,(di)
ret
#endasm
#endif
/************************************************************************/
/* Function ltstb */
#ifdef L___ltstb
#asm
| ltstb.s
| ltstb, ltstub don`t preserve ax
.globl ltstb
.globl ltstub
ltstb:
ltstub:
test ax,ax
je LTST_NOT_SURE
ret
.even
LTST_NOT_SURE:
test bx,bx
js LTST_FIX_SIGN
ret
.even
LTST_FIX_SIGN:
inc ax | clear ov and mi, set ne for greater than
ret
#endasm
#endif
#endif
|