Freescale Semiconductor MC68881 - Page 76

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FABS Absolute Value FABS
Operation: Absolute Value of Source 0 FPn
Assembler FABS.<fmt> <ea>,FPn
Syntax: FABS.X FPm,FPn
FABS.X FPn
Attributes: Format= (Byte, Word, Long, Single, Double, Extended, Packed)
Description: Converts the source operand to extended precision (if necessary) and stores
the absolute value of that number in the destination floating-point data register.
Operation Table:
Source In Range
Destination
~ +
Resu t Absolute Value
Zero
+
Absotute Value
Infinity
L
+ - I
Absolute
Value
NOTE: If the source operand is a NAN, refer to 4.5.4 NANs for more information.
Status Register:
Condition Codes:
Quotient Byte:
Exception Byte:
Affected as described in 4.5.5.1 SETTING FLOATING-POINT
CONDITION
CODES.
Not affected
BSUN Cleared
SNAN Refer to 4.5.4
NANs
OPERR Cleared
OVFL Cleared
UNFL If the source is an extended precision denor-
realized number, refer to 6.1.5 Underflow;
cleared otherwise.
DZ Cleared
INEX2 Cleared
INEX1 If <fret> is Packed, refer to 6.1.8 Inexact
Result
on Decimal Input; cleared otherwise.
Accrued Exception Byte: Affected as described in 6.1.10 IEEE Exception and Trap Com-
patibility.
Instruction Format:
~5 ]4 ~3 12 11 lO 9 8 7
1 1 ] 1, 10 ] 0 0
SOURCE DESTINATION
0 RIM 0 SPECIFIER REGISTER
6 5 4 3 2 1 O
EFFECTIV~ ADDRESS
0 MODE l REGISTER
0 0 I I I I 0 t 0 t C
FREESCALE
4-18
MC68881/MC68882 USER'S MANUAL