Assembler äëÿ íà÷èíàþùèõ
î òîì, ÷òî íóæíî óäàëèòü
ñîïðîöåññîðà 8087, íå áåñïîêîÿñü î òîì, ÷òî íóæíî óäàëèòü èç ñòåêà
ïåðâûé îïåðàíä ïîñëå îïåðàöèè.
Microsoft (R) Macro Assembler Version 5.00 1/1/80 04:04:23
Ôèã. 7.20 Óñëîâíûé ïåðåõîä Page 1-1
PAGE ,132
TITLE Ôèã. 7.20 Óñëîâíûé ïåðåõîä
0000 CODE SEGMENT
ASSUME CS:CODE,DS:CODE
0000 WORD_INTEGER LABEL WORD
0000 ???? STATUS_WORD DW ?
;----- Ñðàâíèâàåòñÿ WORD_PTR ñî ñëîâîì íà âåðøèíå ñòåêà ñîïðîöåññîðà 8087
0002 9B DE 16 0000 R FICOM WORD_INTEGER ; Ñðàâíåíèå ñëîâà ñ ST
0007 9B DD 3E 0000 R FSTSW STATUS_WORD ; Ñîõðàíåíèå ñëîâà ñîñòîÿíèÿ 8087
000C 9B FWAIT ; Ñèíõðîíèçàöèÿ ïðîöåññîðà ñ ñîïðîöåññîðîì
000D 8A 26 0001 R MOV AH,BYTE PTR STATUS_WORD+1
0011 9E SAHF ; Çàíåñåíèå ôëàãîâ (C0=CF,C3=ZF)
0012 72 02 JB CONTINUE ; Ïðîâåðêà ôëàãà C0,ïåðåõîä åñëè 0
0014 75 00 JNE ST_GREATER ; Ïðîâåðêà ôëàãà C3
0016 ST_EQUAL: ; Ïîïàäàåì ñþäà,åñëè C3=1,C0=0 -
; ... ; çíà÷åíèÿ ðàâíû
0016 ST_GREATER: ; Ïîïàäàåì ñþäà,åñëè C3=0,C0=0 - ÷èñëî
; ... ; íà âåðøèíå ñòåêà 8087 áîëüøå WORD_PTR
0016 CONTINUE:
0016 75 00 JNE ST_LESS ; Ïðîâåðêà ôëàãà C3
0018 UNORDERED: ; Ïîïàäàåì ñþäà,åñëè C3=1,C0=1 - íåâîç-
Forekc.ru
Ðåôåðàòû, äèïëîìû, êóðñîâûå, âûïóñêíûå è êâàëèôèêàöèîííûå ðàáîòû, äèññåðòàöèè, ó÷åáíèêè, ó÷åáíûå ïîñîáèÿ, ëåêöèè, ìåòîäè÷åñêèå ïîñîáèÿ è ðåêîìåíäàöèè, ïðîãðàììû è êóðñû îáó÷åíèÿ, ïóáëèêàöèè èç ïðîôèëüíûõ èçäàíèé