參數資料
型號: intel i387
廠商: Intel Corp.
英文描述: Military I387 Math Coprocessor(軍用I387數學協(xié)處理器)
中文描述: 軍事I387數學協(xié)處理器(軍用I387數學協(xié)處理器)
文件頁數: 37/41頁
文件大小: 457K
代理商: INTEL I387
MILITARY i387
TM
MATH COPROCESSOR
i387
TM
NPX Extensions to the i386 Processor Instruction Set
Encoding
Byte
1
Clock Count Range
32-Bit
Integer
Instruction
Byte
0
Optional
Bytes 2–6
32-Bit
Real
64-Bit
Real
16-Bit
Integer
DATA TRANSFER
FLD
e
Load
a
Integer/real memory to ST(0)
ESC MF 1
MOD 000 R/M
SIB/DISP
20
45–52
25
61–65
Long integer memory to ST(0)
ESC 111
MOD 101 R/M
SIB/DISP
56–67
Extended real memory to ST(0)
ESC 011
MOD 101 R/M
SIB/DISP
44
BCD memory to ST(0)
ESC 111
MOD 100 R/M
SIB/DISP
266–275
ST(i) to ST(0)
ESC 001
11000 ST(i)
14
FST
e
Store
ST(0) to integer/real memory
ESC MF 1
MOD 010 R/M
SIB/DISP
44
79–93
45
82–95
ST(0) to ST(i)
ESC 101
11010 ST(i)
11
FSTP
e
Store and Pop
ST(0) to integer/real memory
ESC MF 1
MOD 011 R/M
SIB/DISP
44
79–93
45
82–95
ST(0) to long integer memory
ESC 111
MOD 111 R/M
SIB/DISP
80–97
ST(0) to extended real
ESC 011
MOD 111 R/M
SIB/DISP
53
ST(0) to BCD memory
ESC 111
MOD 110 R/M
SIB/DISP
512–534
ST(0) to ST(i)
ESC 101
11001 ST (i)
12
FXCH
e
Exchange
ST(i) and ST(0)
ESC 001
11001 ST(i)
18
COMPARISON
FCOM
e
Compare
Integer/real memory to ST(0)
ESC MF 0
MOD 010 R/M
SIB/DISP
26
56–63
31
71–75
ST(i) to ST(0)
ESC 000
11010 ST(i)
24
FCOMP
e
Compare and pop
Integer/real memory to ST
ESC MF 0
MOD 011 R/M
SIB/DISP
26
56–63
31
71–75
ST(i) to ST(0)
ESC 000
11011 ST(i)
26
FCOMPP
e
Compare and pop twice
ST(1) to ST(0)
ESC 110
1101 1001
26
FTST
e
Test ST(0)
ESC 001
1110 0100
28
FUCOM
e
Unordered compare
ESC 101
11100 ST(i)
24
FUCOMP
e
Unordered compare
and pop
ESC 101
11101 ST(i)
26
FUCOMPP
e
Unordered compare
and pop twice
ESC 010
1110 1001
26
FXAM
e
Examine ST(0)
ESC 001
11100101
30-38
CONSTANTS
FLDZ
e
Load
a
0.0 into ST(0)
ESC 001
1110 1110
20
FLD1
e
Load
a
1.0 into ST(0)
ESC 001
1110 1000
24
FLDPI
e
Load pi into ST(0)
ESC 001
1110 1011
40
FLDL2T
e
Load log
2
(10) into ST(0)
ESC 001
1110 1001
40
Shaded areas indicate instructions not available in M8087/M80287.
NOTE:
a. When loading single- or double-precision zero from memory, add 5 clocks.
37
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