4
FATAN H Hyperbolic Arc Tangent FATAN H
Operation:
Hyperbolic Arc Tangent of Source j FPn
Assembler
FATANH.<fmt> <ea>,FPn
Syntax:
FATAN H.X FPm,FP n
FATANH.X FPn
Attributes:
Format= (Byte, Word, Long, Single, Double, Extended, Packed)
Description:
Converts the source operand to extended precision (if necessary) and cal-
culates the hyperbolic arc tangent of that value. Stores the result in the destination
floating-point data register, This function is not defined for source operands outside
of the range ( - 1 i.. + 1); and the result is equal to - infinity or + infinity if the source
is equal to + 1 or - 1, respectively. If the source is outside of the range [- 1... + 1],
a NAN is returned as the result and the OPERR bit is set in the FPSR.
Operation Table:
Source
Destination
In
Range
Result Hyperbolic
Arc Tangent
Zero
4-
+0,0 -0.0
Infinity
+
NAN 1
NOTE:
1. Sets
the OPERR bit in the FPSR exception byte.
2, If the source operand" is a NAN, refer to 4.5.4 NANs for more information.
Status Register:
Condition Codes:
Quotient Byte:
Exception Byte:
Accrued Exception Byte:
Affected as described in 4.5.5,1 SETTING FLOATING-POINT
CONDITION
CODES
Not affected
BSUN
SNAN
OPERR
Cleared
Refer to 4.5.4
NANs.
Set if the source is > +1 or < -1; cleared
otherwise
OVFL Cleared
UNFL Refer to 6.1.5 Underflow.
DZ Set if the source is equal to + 1 or - 1 ; cleared
otherwise
INEX2 Refer to 6.1.7 Inexact Result.
INEX1 If <fmt> is Packed, refer to 6.1.8 Inexact Result
on Decimal
Input; cleared otherwise.
Affected as described in 6.1.10 IEEE
Exception and
Trap Com-
patibility
FREESCALE
4-28
MC68881/MC68882 USER'S MANUAL
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