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Copy pathLB7.asm
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384 lines (325 loc) · 8.87 KB
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Copy pathLB7.asm
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384 lines (325 loc) · 8.87 KB
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model SMALL
.486
stack 100h
dataseg
diff_sign_txt db 0Ah, 0Dh, 'Sign not different!$'
enter_txt db 0Ah, 0Dh, 'Enter X: $'
eps_enter_txt db 0Ah, 0Dh, 'Enter eps: $'
result_txt db 0Ah, 0Dh, 'Result: $'
err_txt db 0Ah, 0Dh, 'Err! $'
str_max_len db 40
str_len db ?
str_buf db 40 dup(?)
s3coef dw 1
s2coef dw -7
s1coef dw -9
s0coef dw 49
two dw 2
number1 dq ?
number2 dq ?
number1R dq ?
number2R dq ?
eps dq ?
result dq ?
haveRes db ?
codeseg
startupcode
finit
jmp enter_nums
not_diff:
lea DX, [diff_sign_txt]
mov AH, 09h
int 21h
enter_nums:
mov [enter_txt + 8], 'a'
lea DX, [enter_txt]
mov AH, 09h
int 21h
lea DX, [str_max_len]
mov AH, 0AH
int 21h
push offset number1
push offset str_buf
call StrToDouble
add SP, 2
mov [enter_txt + 8], 'b'
lea DX, [enter_txt]
mov AH, 09h
int 21h
lea DX, [str_max_len]
mov AH, 0AH
int 21h
push offset number2
push offset str_buf
call StrToDouble
add SP, 2
lea DX, [eps_enter_txt]
mov AH, 09h
int 21h
lea DX, [str_max_len]
mov AH, 0AH
int 21h
push offset eps
push offset str_buf
call StrToDouble
add SP, 2
lea BX, [number1r]
call CalculateFunction PASCAL, number1
lea BX, [number2r]
call CalculateFunction PASCAL, number2
call DoubleSign PASCAL, number1r, number2r
jz not_diff
call FindRoot PASCAL, number1, number2, eps
cmp [haveRes], 0
jnz ok
lea DX, [err_txt]
mov AH, 09h
int 21h
exitcode 0
ok:
push offset str_buf
push offset result
call DoubleToStr
add sp, 2
lea DX, [result_txt]
mov AH, 09h
int 21h
lea DX, [str_buf]
mov AH, 09h
int 21h
exitcode 0
;ZF = sigh difference
DoubleSign proc PASCAL @@number1:qword, @@number2:qword
uses AX
mov AL, byte ptr [@@number1+7]
xor AL, byte ptr [@@number2+7]
test AL, 080h
ret
DoubleSign endp
FindRoot proc PASCAL
arg @@left:qword, @@right:qword, @@eps:qword
local @@deltaX:qword, @@middle:qword, @@temp1:qword, @@temp2:qword
uses AX, BX
lea BX, @@temp1
call CalculateFunction PASCAL, @@left
lea BX, @@temp2
call CalculateFunction PASCAL, @@right
call DoubleSign PASCAL, @@temp1, @@temp2
@@L0:
fld @@right
fsub @@left
fstp @@deltaX
jmp @@L2
@@L4:
;deltaX /= 2;
fld @@deltaX
fild [two]
fdivp st(1), st
fstp @@deltaX
;middle = left + deltaX;
fld @@left
fadd @@deltaX
fstp @@middle
lea BX, @@temp1
call CalculateFunction PASCAL, @@left
lea BX, @@temp2
call CalculateFunction PASCAL, @@middle
call DoubleSign PASCAL, @@temp1, @@temp2
fld @@middle
jz @@L3
fstp @@right
jmp @@L2 ;to condition
@@L3:
fstp @@left
; if right - left > eps
@@L2:
fld @@right
fsub @@left
fld @@eps
fcompp
fwait
fstsw AX
sahf
jb @@L4
@@L1:
fld @@middle
fstp result
mov [haveRes], 1
ret
@@err:
mov [haveRes], 0
ret
FindRoot endp
;return result on BX address
CalculateFunction proc PASCAL
ARG @@x:qword
fld @@x
fild s3coef
fmulp st(1), st
fmul @@x
fmul @@x
fld @@x
fild s2coef
fmulp st(1), st
fmul @@x
faddp st(1), st
fld @@x
fild s1coef
fmulp st(1), st
faddp st(1), st
fild s0coef
faddp st(1), st
fstp qword ptr [BX]
ret
CalculateFunction endp
DoubleToStr proc near
push BP
mov BP, SP
sub SP, 4 ; ¢ë¤¥«ï¥¬ 4 ¡ ©â ¢ á⥪¥
push ax bx DX cx di
pushf
fnstcw [BP-4] ; á®åà ¨¬ § 票¥ ॣ¨áâà ã¯à ¢«¥¨ï
fnstcw [BP-2]
and word ptr [BP - 2], 1111001111111111b; ¡¨âë 11?10 ã¯à ¢«¥¨¥ ®ªà㣫¥¨¥¬, 11 ? ª ã«î
or word ptr [BP - 2], 0000110000000000b
fldcw [BP - 2] ; ‡ ¯¨áì ®¢®£® § 票ï ॣ¨áâà ã¯à ¢«¥¨ï
mov bx, [BP + 4]
fld qword ptr[bx] ; § â «ª¨¢ ¥¬ ¢ á⥪ ᮯà®æ¥áá®à ç¨á«®
ftst
fstsw ax
and AH, 1
cmp AH, 1
jne @@NBE
mov bx, [BP + 6]
mov byte ptr[bx], '-'
inc word ptr[BP + 6]
@@NBE: fabs
fst st(1)
fst st(2)
frndint
fsub st(2), st(0)
mov word ptr[BP - 2], 10
fild word ptr[BP - 2]
fxch st(1)
xor cx, cx
@@BG: fprem
fist word ptr [BP - 2]
push word ptr [BP - 2]
fxch st(2)
fdiv st(0), st(1)
frndint
fst st(2)
inc cx
ftst ; áà ¢¨âì st(0) c 0
fstsw ax ; SR -> AX
sAHf ; AH ¢ä« £¨
jnz @@BG ; ¥á«¨ 14 ¡¨â SR == 0 (6 ¡¨â AH) (¥á«¨ zf == 0 ¯à릮ª)
mov ax, cx
mov bx, [BP + 6]
@@BFG: pop DX
add DX, '0'
mov byte ptr[bx], dl
inc bx
loop @@BFG
fxch st(3)
fst st(2)
ftst
fstsw ax
sAHf
jz @@CNE
mov byte ptr[bx], '.'
mov cx, 16
@@BFR: fmul st(0), st(1)
fst st(2)
frndint
fsub st(2), st(0)
fist word ptr [BP - 2]
fxch st(2)
mov ax, [BP - 2]
add ax, '0'
inc bx
mov byte ptr[bx], al
loop @@BFR
@@NIL: cmp byte ptr[bx], '0'
jne @@CNR
dec bx
jmp @@NIL
@@CNR: inc bx
@@CNE: mov byte ptr[bx], '$'
fstp st(0)
fstp st(0)
fstp st(0)
fstp st(0)
fldcw [BP - 4] ; ¢®ááâ ®¢¨¬ áâனª¨ ᮯà®æ¥áá®à
popf
pop di cx DX bx ax
add SP, 4
pop BP
ret
DoubleToStr endp
StrToDouble proc near
push BP
mov BP, SP
sub SP, 2 ; ¢ë¤¥«ï¥¬ 2 ¡ ©â ¢ á⥪¥
push ax bx DX cx di
pushf
mov word ptr[BP - 2], 10 ; ¯®¬¥é ¥¬ ¢ ¢ë¤¥«¥ë¥ 2 ¡ ©â 10
fild word ptr[BP - 2] ; § â «ª¨¢ ¥¬ ¢ á⥪ ᮯà®æ¥áá®à 10
fldz ; § â «ª¨¢ ¥¬ ¢ á⥪ ᮯà®æ¥áá®à 0
mov di, 0
mov bx, [BP + 4] ; ¯®¬¥é ¥¬ ¢ bx ¤à¥á ¨§ á⥪
cmp byte ptr[bx], '-'
jne @@BPN
inc bx
mov di, 1
@@BPN: movsx ax, byte ptr [bx]
cmp ax, '.'
je @@PNT1
cmp ax, 0dh
jne @@CNT
fxch st(1)
fstp st(0)
jmp @@REN
@@CNT: sub ax, '0'
mov word ptr[BP - 2], ax
fmul st(0), st(1) ; 㬮¦ ¥¬ ç¨á«® ¢¥à訥 á⥪ 10
fiadd word ptr[BP - 2] ; ¤®¡ ¢«ï¥¬ ª ç¨á«ã ¢¥à訥 á⥪ â® çâ® ¡ë«® ¢ ax
inc bx
jmp @@BPN
@@PNT1:
xor cx, cx
@@BEG: inc bx
movsx ax, byte ptr [bx]
cmp ax, 0dh
je @@END
loop @@BEG
@@END: dec bx
fxch st(1)
fldz
@@APN: movsx ax, [bx]
cmp ax, '.'
je @@PNT2
sub ax, '0'
mov word ptr[BP - 2], ax
fiadd word ptr[BP - 2]
fdiv st(0), st(1)
dec bx
jmp @@APN
@@PNT2:
;
fxch st(1) ; ¬¥ï¥¬ ç¨á«® 10 ¨ ®áâ ⮪ ¬¥áâ ¬¨
fstp st(0) ; ¢ëâ «ª¨¢ ¥¬ 10
faddp st(1) ; ᪫ ¤ë¢ ¥¬ 楫ãî ¨ ¤à®¡ãî ç áâ¨
@@REN:
cmp di, 1
jne @@CYK
fchs
@@CYK: mov bx, [BP + 6] ; ¯®¬¥é ¥¬ ¢ bx ¤à¥á ¨§ á⥪
fstp qword ptr [bx] ; ¯®¬¥é ¥¬ ¯® ¤à¥áã ¨§ á⥪ ç¨á«®
popf
pop di cx DX bx ax
add SP, 2
pop BP
ret
StrToDouble endp
end