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PROGRAMMING NUMERIC APPLICATIONS
Table
2-14.
Instruction
Set
Reference Data
(Cont'd.)
FSUBR
FSUBR
/ /source/destination, source
Exceptions:
I,
D,
0,
U,
P
Subtract real reversed
Execution Clocks
Operands
Operand
Word Code
Coding Example
Typical Range
Transfers Bytes
/
/ST,ST(i)/ST(i),ST
87
70-100 0 2 FSUBR ST,ST(1)
short-real
105
90-120 2 2-4
FSUBR VECTOR[SI]
long-real 110 95-125 4 2-4 FSUBR [BX].INDEX
FSUBRP
FSUBRP
destination, source
Exceptions:
I,
D,
0,
U,
P
Subtract real reversed and pop
Execution Clocks
Operands
Operand
Word
Code
Coding Example
Typical Range
Transfers
Bytes
ST(i),ST
90
75-105 0 2
FSUBRP
ST(1),ST
FTST
FTST (no operands)
Exceptions:
I,
D
Test stack top against
+0.0
Execution Clocks
Operands
Operand
Word
Code
Coding Example
Typical Range
Transfers Bytes
(no operands)
42
38-48
0 2
FTST
FWAIT
FWAIT (no operands)
Exceptions: None
(CPU
instruction)
(CPU) Wait while 80287
is
busy
Execution Clocks
Operands
Operand Word
Coda
Coding Example
Typical
Range
Transfers
Bytes
(no operands)
3+5n*
3+5n
4
0 1 FWAIT
FXAM
FXAM
(no operands)
Exceptions: None
Examine stack top
Execution Clocks
Operands
Operand
Word Code
Coding Example
Typical Range
Transfers Bytes
(no operands)
17
12-23
0
2 FXAM
2-36