1989-11-29 09:49:35 +00:00
|
|
|
.define .adf4, .adf8, .sbf4, .sbf8, .mlf4, .mlf8, .dvf4, .dvf8
|
|
|
|
|
.define .ngf4, .ngf8, .fif4, .fif8, .fef4, .fef8
|
|
|
|
|
.define .cif4, .cif8, .cuf4, .cuf8, .cfi, .cfu, .cff4, .cff8
|
|
|
|
|
.define .cmf4, .cmf8
|
|
|
|
|
.sect .text; .sect .rom; .sect .data; .sect .bss
|
|
|
|
|
|
|
|
|
|
! $Header$
|
|
|
|
|
|
|
|
|
|
! Implement interface to floating point package for Intel 8087
|
|
|
|
|
|
|
|
|
|
.sect .rom
|
|
|
|
|
one:
|
|
|
|
|
.data2 1
|
|
|
|
|
two:
|
|
|
|
|
.data2 2
|
|
|
|
|
bigmin:
|
|
|
|
|
.data4 -2147483648
|
|
|
|
|
|
|
|
|
|
.sect .text
|
|
|
|
|
.adf4:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
flds 4(bx)
|
|
|
|
|
fadds 8(bx)
|
|
|
|
|
fstps 8(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
.adf8:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
fldd 4(bx)
|
|
|
|
|
faddd 12(bx)
|
|
|
|
|
fstpd 12(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.sbf4:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
flds 8(bx)
|
|
|
|
|
fsubs 4(bx)
|
|
|
|
|
fstps 8(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.sbf8:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
fldd 12(bx)
|
|
|
|
|
fsubd 4(bx)
|
|
|
|
|
fstpd 12(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.mlf4:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
flds 4(bx)
|
|
|
|
|
fmuls 8(bx)
|
|
|
|
|
fstps 8(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
.mlf8:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
fldd 4(bx)
|
|
|
|
|
fmuld 12(bx)
|
|
|
|
|
fstpd 12(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.dvf4:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
flds 8(bx)
|
|
|
|
|
fdivs 4(bx)
|
|
|
|
|
fstps 8(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.dvf8:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
fldd 12(bx)
|
|
|
|
|
fdivd 4(bx)
|
|
|
|
|
fstpd 12(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.ngf4:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
flds 4(bx)
|
|
|
|
|
fchs
|
|
|
|
|
fstps 4(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.ngf8:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
fldd 4(bx)
|
|
|
|
|
fchs
|
|
|
|
|
fstpd 4(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.fif4:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
flds 8(bx)
|
|
|
|
|
fmuls 12(bx) ! multiply
|
|
|
|
|
fld st ! copy result
|
|
|
|
|
ftst ! test sign; handle negative separately
|
|
|
|
|
fstsw ax
|
|
|
|
|
wait
|
|
|
|
|
sahf ! result of test in condition codes
|
|
|
|
|
jb 1f
|
|
|
|
|
frndint ! this one rounds (?)
|
|
|
|
|
fcom st(1) ! compare with original; if <=, then OK
|
|
|
|
|
fstsw ax
|
|
|
|
|
wait
|
|
|
|
|
sahf
|
|
|
|
|
jbe 2f
|
|
|
|
|
fisubs (one) ! else subtract 1
|
|
|
|
|
jmp 2f
|
|
|
|
|
1: ! here, negative case
|
|
|
|
|
frndint ! this one rounds (?)
|
|
|
|
|
fcom st(1) ! compare with original; if >=, then OK
|
|
|
|
|
fstsw ax
|
|
|
|
|
wait
|
|
|
|
|
sahf
|
|
|
|
|
jae 2f
|
|
|
|
|
fiadds (one) ! else add 1
|
|
|
|
|
2:
|
|
|
|
|
fsub st(1),st ! subtract integer part
|
|
|
|
|
mov bx,4(bx)
|
|
|
|
|
fstps (bx)
|
|
|
|
|
fstps 4(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.fif8:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
fldd 8(bx)
|
|
|
|
|
fmuld 16(bx) ! multiply
|
|
|
|
|
fld st ! and copy result
|
|
|
|
|
ftst ! test sign; handle negative separately
|
|
|
|
|
fstsw ax
|
|
|
|
|
wait
|
|
|
|
|
sahf ! result of test in condition codes
|
|
|
|
|
jb 1f
|
|
|
|
|
frndint ! this one rounds (?)
|
|
|
|
|
fcom st(1) ! compare with original; if <=, then OK
|
|
|
|
|
fstsw ax
|
|
|
|
|
wait
|
|
|
|
|
sahf
|
|
|
|
|
jbe 2f
|
|
|
|
|
fisubs (one) ! else subtract 1
|
|
|
|
|
jmp 2f
|
|
|
|
|
1: ! here, negative case
|
|
|
|
|
frndint ! this one rounds (?)
|
|
|
|
|
fcom st(1) ! compare with original; if >=, then OK
|
|
|
|
|
fstsw ax
|
|
|
|
|
wait
|
|
|
|
|
sahf
|
|
|
|
|
jae 2f
|
|
|
|
|
fiadds (one) ! else add 1
|
|
|
|
|
2:
|
|
|
|
|
fsub st(1),st ! subtract integer part
|
|
|
|
|
mov bx,4(bx)
|
|
|
|
|
fstpd (bx)
|
|
|
|
|
fstpd 8(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.fef4:
|
|
|
|
|
! this could be simpler, if only the
|
|
|
|
|
! fxtract instruction was emulated properly
|
|
|
|
|
mov bx,sp
|
|
|
|
|
mov ax,8(bx)
|
|
|
|
|
and ax,0x7f800000
|
|
|
|
|
je 1f ! zero exponent
|
|
|
|
|
shr ax,23
|
|
|
|
|
sub ax,126
|
|
|
|
|
mov cx,ax ! exponent in cx
|
|
|
|
|
mov ax,8(bx)
|
|
|
|
|
and ax,0x807fffff
|
|
|
|
|
or ax,0x3f000000 ! load -1 exponent
|
|
|
|
|
mov bx,4(bx)
|
|
|
|
|
mov 4(bx),ax
|
|
|
|
|
mov (bx),cx
|
|
|
|
|
ret
|
|
|
|
|
1: ! we get here on zero exp
|
|
|
|
|
mov ax,8(bx)
|
|
|
|
|
and ax,0x007fffff
|
|
|
|
|
jne 1f ! zero result
|
|
|
|
|
mov bx,4(bx)
|
|
|
|
|
mov (bx),ax
|
|
|
|
|
mov 4(bx),ax
|
|
|
|
|
ret
|
|
|
|
|
1: ! otherwise unnormalized number
|
|
|
|
|
mov cx,8(bx)
|
|
|
|
|
and cx,0x807fffff
|
|
|
|
|
mov dx,cx
|
|
|
|
|
and cx,0x80000000
|
|
|
|
|
mov ax,-125
|
|
|
|
|
2:
|
|
|
|
|
test dx,0x800000
|
|
|
|
|
jne 1f
|
|
|
|
|
dec ax
|
|
|
|
|
shl dx,1
|
|
|
|
|
or dx,cx
|
|
|
|
|
jmp 2b
|
|
|
|
|
1:
|
|
|
|
|
mov bx,4(bx)
|
|
|
|
|
mov (bx),ax
|
|
|
|
|
and dx,0x807fffff
|
|
|
|
|
or dx,0x3f000000 ! load -1 exponent
|
|
|
|
|
mov 4(bx),dx
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.fef8:
|
|
|
|
|
! this could be simpler, if only the
|
|
|
|
|
! fxtract instruction was emulated properly
|
|
|
|
|
mov bx,sp
|
|
|
|
|
mov ax,12(bx)
|
|
|
|
|
and ax,0x7ff00000
|
|
|
|
|
je 1f ! zero exponent
|
|
|
|
|
shr ax,20
|
|
|
|
|
sub ax,1022
|
|
|
|
|
mov cx,ax ! exponent in cx
|
|
|
|
|
mov ax,12(bx)
|
|
|
|
|
and ax,0x800fffff
|
|
|
|
|
or ax,0x3fe00000 ! load -1 exponent
|
|
|
|
|
mov dx,8(bx)
|
|
|
|
|
mov bx,4(bx)
|
|
|
|
|
mov 4(bx),dx
|
|
|
|
|
mov 8(bx),ax
|
|
|
|
|
mov (bx),cx
|
|
|
|
|
ret
|
|
|
|
|
1: ! we get here on zero exp
|
|
|
|
|
mov ax,12(bx)
|
|
|
|
|
and ax,0xfffff
|
|
|
|
|
or ax,8(bx)
|
|
|
|
|
jne 1f ! zero result
|
|
|
|
|
mov bx,4(bx)
|
|
|
|
|
mov (bx),ax
|
|
|
|
|
mov 4(bx),ax
|
|
|
|
|
mov 8(bx),ax
|
|
|
|
|
ret
|
|
|
|
|
1: ! otherwise unnormalized number
|
|
|
|
|
mov cx,12(bx)
|
|
|
|
|
and cx,0x800fffff
|
|
|
|
|
mov dx,cx
|
|
|
|
|
and cx,0x80000000
|
|
|
|
|
mov ax,-1021
|
|
|
|
|
2:
|
|
|
|
|
test dx,0x100000
|
|
|
|
|
jne 1f
|
|
|
|
|
dec ax
|
|
|
|
|
shl 8(bx),1
|
|
|
|
|
rcl dx,1
|
|
|
|
|
or dx,cx
|
|
|
|
|
jmp 2b
|
|
|
|
|
1:
|
|
|
|
|
and dx,0x800fffff
|
|
|
|
|
or dx,0x3fe00000 ! load -1 exponent
|
|
|
|
|
mov cx,8(bx)
|
|
|
|
|
mov bx,4(bx)
|
|
|
|
|
mov (bx),ax
|
|
|
|
|
mov 8(bx),dx
|
|
|
|
|
mov 4(bx),cx
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.cif4:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
fildl 8(bx)
|
|
|
|
|
fstps 8(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.cif8:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
fildl 8(bx)
|
|
|
|
|
fstpd 4(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.cuf4:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
fildl 8(bx)
|
|
|
|
|
cmp 8(bx),0
|
|
|
|
|
jge 1f
|
|
|
|
|
fisubl (bigmin)
|
|
|
|
|
fisubl (bigmin)
|
|
|
|
|
1:
|
|
|
|
|
fstps 8(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.cuf8:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
fildl 8(bx)
|
|
|
|
|
cmp 8(bx),0
|
|
|
|
|
jge 1f
|
|
|
|
|
fisubl (bigmin)
|
|
|
|
|
fisubl (bigmin)
|
|
|
|
|
1:
|
|
|
|
|
fstpd 4(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.cfi:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
fstcw 4(bx)
|
|
|
|
|
wait
|
|
|
|
|
mov dx,4(bx)
|
|
|
|
|
or 4(bx),0xc00 ! truncating mode
|
|
|
|
|
wait
|
|
|
|
|
fldcw 4(bx)
|
|
|
|
|
cmp 8(bx),4
|
|
|
|
|
jne 2f
|
|
|
|
|
! loc 4 loc ? cfi
|
|
|
|
|
flds 12(bx)
|
|
|
|
|
fistpl 12(bx)
|
|
|
|
|
1:
|
|
|
|
|
mov 4(bx),dx
|
|
|
|
|
wait
|
|
|
|
|
fldcw 4(bx)
|
|
|
|
|
ret
|
|
|
|
|
2:
|
|
|
|
|
! loc 8 loc ? cfi
|
|
|
|
|
fldd 12(bx)
|
|
|
|
|
fistpl 16(bx)
|
|
|
|
|
jmp 1b
|
|
|
|
|
|
|
|
|
|
.cfu:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
fstcw 4(bx)
|
|
|
|
|
wait
|
|
|
|
|
mov dx,4(bx)
|
1992-03-02 11:52:09 +00:00
|
|
|
and 4(bx),0xf3ff
|
|
|
|
|
or 4(bx),0x400 ! to -infinity
|
1989-11-29 09:49:35 +00:00
|
|
|
wait
|
|
|
|
|
fldcw 4(bx)
|
|
|
|
|
cmp 8(bx),4
|
|
|
|
|
jne 2f
|
|
|
|
|
! loc 4 loc ? cfu
|
|
|
|
|
flds 12(bx)
|
|
|
|
|
fabs ! ???
|
1992-03-02 11:52:09 +00:00
|
|
|
fiaddl (bigmin)
|
1989-11-29 09:49:35 +00:00
|
|
|
fistpl 12(bx)
|
|
|
|
|
wait
|
1992-03-02 11:52:09 +00:00
|
|
|
mov ax,12(bx)
|
|
|
|
|
sub ax,(bigmin)
|
|
|
|
|
mov 12(bx),ax
|
1989-11-29 09:49:35 +00:00
|
|
|
1:
|
|
|
|
|
mov 4(bx),dx
|
|
|
|
|
wait
|
|
|
|
|
fldcw 4(bx)
|
|
|
|
|
ret
|
|
|
|
|
2:
|
|
|
|
|
! loc 8 loc ? cfu
|
|
|
|
|
fldd 12(bx)
|
|
|
|
|
fabs ! ???
|
1992-03-02 11:52:09 +00:00
|
|
|
fiaddl (bigmin)
|
1989-11-29 09:49:35 +00:00
|
|
|
fistpl 16(bx)
|
1992-03-02 11:52:09 +00:00
|
|
|
wait
|
|
|
|
|
mov ax,16(bx)
|
|
|
|
|
sub ax,(bigmin)
|
|
|
|
|
mov 16(bx),ax
|
1989-11-29 09:49:35 +00:00
|
|
|
jmp 1b
|
|
|
|
|
|
|
|
|
|
.cff4:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
fldd 4(bx)
|
|
|
|
|
fstcw 4(bx)
|
|
|
|
|
wait
|
|
|
|
|
mov dx,4(bx)
|
|
|
|
|
and 4(bx),0xf3ff ! set to rounding mode
|
|
|
|
|
wait
|
|
|
|
|
fldcw 4(bx)
|
|
|
|
|
fstps 8(bx)
|
|
|
|
|
mov 4(bx),dx
|
|
|
|
|
wait
|
|
|
|
|
fldcw 4(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.cff8:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
flds 4(bx)
|
|
|
|
|
fstpd 4(bx)
|
|
|
|
|
wait
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
.cmf4:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
xor cx,cx
|
|
|
|
|
flds 8(bx)
|
|
|
|
|
flds 4(bx)
|
|
|
|
|
fcompp ! compare and pop operands
|
|
|
|
|
fstsw ax
|
|
|
|
|
wait
|
|
|
|
|
sahf
|
|
|
|
|
je 1f
|
|
|
|
|
jb 2f
|
|
|
|
|
dec cx
|
|
|
|
|
jmp 1f
|
|
|
|
|
2:
|
|
|
|
|
inc cx
|
|
|
|
|
1:
|
|
|
|
|
mov ax,cx
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
.cmf8:
|
|
|
|
|
mov bx,sp
|
|
|
|
|
xor cx,cx
|
|
|
|
|
fldd 12(bx)
|
|
|
|
|
fldd 4(bx)
|
|
|
|
|
fcompp ! compare and pop operands
|
|
|
|
|
fstsw ax
|
|
|
|
|
wait
|
|
|
|
|
sahf
|
|
|
|
|
je 1f
|
|
|
|
|
jb 2f
|
|
|
|
|
dec cx
|
|
|
|
|
jmp 1f
|
|
|
|
|
2:
|
|
|
|
|
inc cx
|
|
|
|
|
1:
|
|
|
|
|
mov ax,cx
|
|
|
|
|
ret
|
