參數(shù)資料
型號(hào): INTEL387DX
英文描述: Intel387 DX - MATH COPROCESSOR
中文描述: Intel387霉素-數(shù)學(xué)協(xié)處理器
文件頁數(shù): 37/41頁
文件大?。?/td> 435K
代理商: INTEL387DX
Intel387
TM
DX MATH COPROCESSOR
Intel387
TM
DX MCP Extensions to the Intel386
TM
DX CPU 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
9–18
26–42
16–23
42–53
Long integer memory to ST(0)
ESC 111
MOD 101 R/M
SIB/DISP
26–54
Extended real memory to ST(0)
ESC 011
MOD 101 R/M
SIB/DISP
12–43
BCD memory to ST(0)
ESC 111
MOD 100 R/M
SIB/DISP
45–97
ST(i) to ST(0)
ESC 001
11000 ST(i)
7–12
FST
e
Store
ST(0) to integer/real memory
ESC MF 1
MOD 010 R/M
SIB/DISP
25–43
57–76
32–44
58–76
ST(0) to ST(i)
ESC 101
11010 ST(i)
7–11
FSTP
e
Store and Pop
ST(0) to integer/real memory
ESC MF 1
MOD 011 R/M
SIB/DISP
25–43
57–76
32–44
58–76
ST(0) to long integer memory
ESC 111
MOD 111 R/M
SIB/DISP
60–82
ST(0) to extended real
ESC 011
MOD 111 R/M
SIB/DISP
46–52
ST(0) to BCD memory
ESC 111
MOD 110 R/M
SIB/DISP
112–190
ST(0) to ST(i)
ESC 101
11011 ST (i)
7–11
FXCH
e
Exchange
ST(i) and ST(0)
ESC 001
11001 ST(i)
10–17
COMPARISON
FCOM
e
Compare
Integer/real memory to ST(0)
ESC MF 0
MOD 010 R/M
SIB/DISP
13–25
34–52
14–27
39–62
ST(i) to ST(0)
ESC 000
11010 ST(i)
13–21
FCOMP
e
Compare and pop
Integer/real memory to ST
ESC MF 0
MOD 011 R/M
SIB/DISP
13–25
34–52
14–27
39–62
ST(i) to ST(0)
ESC 000
11011 ST(i)
13–21
FCOMPP
e
Compare and pop twice
ST(1) to ST(0)
ESC 110
1101 1001
13–21
FTST
e
Test ST(0)
ESC 001
1110 0100
17–25
FUCOM
e
Unordered compare
ESC 101
11100 ST(i)
13–21
FUCOMP
e
Unordered compare
and pop
ESC 101
11101 ST(i)
13–21
FUCOMPP
e
Unordered compare
and pop twice
ESC 010
1110 1001
13–21
FXAM
e
Examine ST(0)
ESC 001
11100101
24–37
CONSTANTS
FLDZ
e
Load
a
0.0 into ST(0)
ESC 001
1110 1110
10–17
FLD1
e
Load
a
1.0 into ST(0)
ESC 001
1110 1000
15–22
FLDPI
e
Load pi into ST(0)
ESC 001
1110 1011
26–36
FLDL2T
e
Load log
2
(10) into ST(0)
ESC 001
1110 1001
26–36
Shaded areas indicate instructions not available in 8087/80287.
NOTE:
a. When loading single- or double-precision zero from memory, add 5 clocks.
37
37
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