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Intel 80286 Computer Accessories User Manual

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PROGRAMMING NUMERIC

APPLICATIONS

Table

2-14.

Instruction

Set

Reference

Data

(Cont'd.)

FXCH

FXCH

//destination

Exceptions:

I

Exchange registers

Execution Clocks

Operands

Operand Word

Code

Coding Example

Typical

Range

Transfers Bytes

I/ST(i)

12

10-15

0

2 FXCH ST(2)

FXTRACT

FXTRACT (no operands)

Exceptions:

I

Extract exponent and significant

Execution Clocks

Operands

Operand Word

Code

Coding Example

Typical

Range

Transfers Bytes

(no operands) 50 27-55

0

2 FXTRACT

FYL2X

FYL2X (no operands)

Exceptions: P (operands

not checked)

y.

Log

2

X

Execution Clocks

Operands

Operand Word

Code

Coding Example

Typical

Range

Transfers Bytes

(no operands) 950 900-1100

0

2 FYL2X

FYL2XP1

FYL2XP1 (no operands)

Exceptions: P (operands not checked)

Y

.log

2

(X

+

1)

Execution Clocks

Operands

Operand Word

Code

Coding Example

Typical Range

Transfers Bytes

(no operands)

850

700-1000

0 2 FYL2XP1

F2XM1

F2XM1 (no operands)

Exceptions:

U,

P (operands not checked)

2x-1

Execution Clocks

Operands

Operand Word

Code

Coding Example

Typical Range

Transfers Bytes

(no operands)

500

310-630

0 2

F2XM1

2-37

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