參數(shù)資料
型號(hào): intel i387
廠商: Intel Corp.
英文描述: Military I387 Math Coprocessor(軍用I387數(shù)學(xué)協(xié)處理器)
中文描述: 軍事I387數(shù)學(xué)協(xié)處理器(軍用I387數(shù)學(xué)協(xié)處理器)
文件頁數(shù): 38/41頁
文件大小: 457K
代理商: INTEL I387
MILITARY i387
TM
MATH COPROCESSOR
i387
TM
NPX Extensions to the i386
TM
Processor Instruction Set
(Continued)
Encoding
Clock Count Range
Instruction
Byte
0
Byte
1
Optional
Bytes 2–6
32-Bit
Real
32-Bit
Integer
64-Bit
Real
16-Bit
Integer
CONSTANTS
(Continued)
FLDL2E
e
Load log
2
(e) into ST(0)
ESC 001
1110 1010
40
FLDLG2
e
Load log
10
(2) into ST(0)
ESC 001
1110 1100
41
FLDLN2
e
Load log
e
(2) into ST(0)
ESC 001
1110 1101
41
ARITHMETIC
FADD
e
Add
Integer/real memory with ST(0)
ESC MF 0
MOD 000 R/M
SIB/DISP
24–32
57–72
29–37
71–85
ST(i) and ST(0)
ESC d P 0
11000 ST(i)
23–31
b
FSUB
e
Subtract
Integer/real memory with ST(0)
ESC MF 0
MOD 10 R R/M
SIB/DISP
24–32
57–82
28–36
71–83
c
ST(i) and ST(0)
ESC d P 0
1110 R R/M
26–34
d
FMUL
e
Multiply
Integer/real memory with ST(0)
ESC MF 0
MOD 001 R/M
SIB/DISP
27–35
61–82
32–57
76–87
ST(i) and ST(0)
ESC d P 0
1100 1 R/M
29–57
e
FDIV
e
Divide
Integer/real memory with ST(0)
ESC MF 0
MOD 11 R R/M
SIB/DISP
89
120–127
f
94
136–140
g
ST(i) and ST(0)
ESC d P 0
1111 R R/M
88
h
FSQRT
i
e
Square root
ESC 001
1111 1010
122–129
FSCALE
e
Scale ST(0) by ST(1)
ESC 001
1111 1101
67–86
FPREM
e
Partial remainder
ESC 001
1111 1000
74–155
FPREM1
e
Partial remainder
(IEEE)
ESC 001
1111 0101
95–185
FRNDINT
e
Round ST(0)
to integer
ESC 001
1111 1100
66–80
FXTRACT
e
Extract components
of ST(0)
ESC 001
1111 0100
70–76
FABS
e
Absolute value of ST(0)
ESC 001
1110 0001
22
FCHS
e
Change sign of ST(0)
ESC 001
1110 0000
24–25
Shaded areas indicate instructions not available in M8087/M80287.
NOTES:
b. Add 3 clocks to the range when d
e
1.
c. Add 1 clock to
each
range when R
e
1.
d. Add 3 clocks to the range when d
e
0.
e. typical
e
52 (When d
e
0, 46–54, typical
e
49).
f. Add 1 clock to the range when R
e
1.
g. 135–141 when R
e
1.
h. Add 3 clocks to the range when d
e
1.
i.
b
0
s
ST(0)
s
a
%
.
38
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