Motorola M68000 Instrukcja Użytkownika Pobierz pdf (Strona 19)

Floating Point Instructions

5-8

M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL

MOTOROLA

FACOS

Arc Cosine

FACOS

(MC6888X, M68040FPSP)

Operation:

Arc Cosine of Source

→

FPn

Assembler

FACOS. < fmt > < ea > ,FPn

Syntax:

FACOS.X FPm,FPn

FACOS.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 cosine of that 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 [0...

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.

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 Set if the source is infinity, > + 1 or < – 1;

cleared otherwise.

OVFL Cleared

UNFL Cleared

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 Cosine +

/2 NAN

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 356 357

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