Motorola CPU32 User Manual download pdf (Page 31)

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Introduction

1-20 M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL MOTOROLA

SNAN can be used as an escape mechanism for a user-deﬁned, non-IEEE data type. The

FPU never creates an SNAN resulting from an operation.

The IEEE speciﬁcation deﬁnes NAN processing used as an input to an operation. A

nonsignaling NAN must be returned when using an SNAN as an input and there is a

disabled SNAN trap. The FPU does this by using the source SNAN, setting the MSB of the

mantissa, and storing the resulting nonsignaling NAN in the destination. Because of the

IEEE formats for NANs, the result of setting an SNAN MSB is always a nonsignaling NAN.

When the FPU creates a NAN, the NAN always contains the same bit pattern in the

mantissa. All bits of the mantissa are ones for any precision. When the user creates a NAN,

any nonzero bit pattern can be stored in the mantissa.

1.6.6 Data Format and Type Summary

Tables 1-4 through 1-6 summarize the data type speciﬁcations for single-, double-, and

extended-precision data formats. Packed decimal real formats support all data types except

denormalized numbers. Table 1-7 summarizes the data types for the packed decimal real

format.

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Motorola CPU32 User Manual Page 31

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