Motorola CPU32 User Manual Page 319

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Floating Point Instructions
MOTOROLA M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL 5-17
FATAN Arc Tangent FATAN
(MC6888X, M68040FPSP)
Operation: Arc Tangent of Source FPn
Assembler FATAN. < fmt > < ea > ,FPn
Syntax: FATAN.X FPm,FPn
FATAN.X FPm,FPnz
Attributes: Format = (Byte, Word, Long, Single, Double, Extended, Packed)
Description: Converts the source operand to extended precision (if necessary) and
calculates the arc tangent of that number. Stores the result in the destination floating-
point data register. The result is in the range of [ – π/2... + π/2].
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 Cleared
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 Arc Tangent
+ 0.0 – 0.0 + π/2 – π/2
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