Floating Point Instructions
MOTOROLA M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL 5-43
FETOXM1 e
x
– 1 FETOXM1
(MC6888X, M68040FPSP)
Operation: e
Source
– 1 → FPn
Assembler FETOXM1. < fmt > < ea > ,FPn
Syntax: FETOXM1.X FPm,FPn
FETOXM1.X FPn
Attributes: Format = (Byte, Word, Long, Single, Double, Extended, Packed)
Description: Converts the source operand to extended precision (if necessary) and
calculates e to the power of that number. Subtracts one from the value and stores the
result in the destination floating-point data register.
Operation Table:
NOTE: If the source operand is a NAN, refer to 1.6.5 Not-A-Numbers for more information.
Floating-Point Status Register:
Condition Codes: Affected as described in 3.6.2 Conditional Testing.
Quotient Byte: Not affected.
Exception Byte: BSUN Cleared
SNAN Refer to 1.6.5 Not-A-Numbers.
OPERR Cleared
OVFL Refer to overflow in the appropriate user’s
manual.
UNFL Refer to underflow in the appropriate user’s
manual.
DZ Cleared
INEX2 Refer to inexact result in the appropriate
user’s manual.
INEX1 If < fmt > is packed, refer to inexact result on
decimal input in the appropriate user’s
manual; cleared otherwise.
Accrued Exception Byte: Affected as described in IEEE exception and trap compati-
bility in the appropriate user’s manual.
DESTINATION
SOURCE
+ In Range – + Zero – + Infinity –
Result e
x
– 1
+ 0.0 – 0.0 + inf – 1.0
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