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MC68060 Software Package
C-12
M68060 USER’S MANUAL
MOTOROLA
The floating-point emulation package provides the following services:
1. Floating-point unimplemented instruction exception handler
2. Floating-point unimplemented data-type exception handler
3. Floating-point unimplemented effective address handler
4. Floating-point arithmetic exception handlers
5. Floating-point library
Table C-2 lists a brief comparison among the M68000 family floating-point processors.
The unimplemented floating-point instructions, effective addresses, and data types that are
handled by the M68060SP are outlined in Table C-3 and Table C-4.
Table C-2. FPU Comparison
Is the default result stored in the destination register for exception-enabled register-to-
register or memory-to-register operations?
FPU INEX DIVZ OPERR SNAN
MC68881/882 Yes No No No
MC68040 Yes No No No
MC68060 Yes* No No No
Is the default result stored for exception-enabled FMOVE OUT?
FPU INEX DIVZ OPERR SNAN
MC68881/882 Yes — Yes Yes
MC68040 Yes Yes+* Yes+*
MC68060 Yes+* Yes+* Yes+*
+ Undefined result written by processor
* Floating-point software package assistance needed to store the default result
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