Floating Point Instructions
5-14 M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL MOTOROLA
FASIN Arc Sine FASIN
(MC6888X, M68040FPSP)
Operation: Arc Sine of the Source → FPn
Assembler FASIN. < fmt > < ea > ,FPn
Syntax: FASIN.X FPm,FPn
FASIN.X FPn
Attributes: Format = (Byte, Word, Long, Single, Double, Extended, Packed)
Description: Converts the source operand to extended precision (if necessary) and
calculates the arc sine of the number. Stores the result in the destination floating-point
data register. This function is not defined for source operands outside of the range [ –
1... + 1]; if the source is not in the correct range, a NAN is returned as the result and
the OPERR bit is set in the floating- point status register. If the source is in the correct
range, the result is in the range of [ – π/2... + π/2].
Operation Table:
NOTES:
1. If the source operand is a NAN, refer to 1.6.5 Not-A-Numbers for more information.
2. Sets the OPERR bit in the floating-point status register exception byte.
DESTINATION
SOURCE
1
+ In Range – + Zero – + Infinity –
Result Arc Sine
+ 0.0 – 0.0
NAN
2
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