Visible to Intel only — GUID: mwh1416946924386
Ixiasoft
Visible to Intel only — GUID: mwh1416946924386
Ixiasoft
8.5.4.1.1. When to Use the Unimplemented Instruction Handler
You might need the unimplemented instruction handler under the following circumstances:
- You are running a Nios II program on an implementation of the Nios II processor other than the one you compiled for. The best solution is to build your program for the correct Nios II processor implementation. Resort to the unimplemented instruction handler only if it is not possible to determine the processor implementation at compile time.
- You have assembly language code that uses an implementation-dependent instruction.
If unimplemented instruction emulation is disabled, but the processor encounters an unimplemented instruction, the software exception funnel treats the exception as a miscellaneous exception.
For more information about miscellaneous exceptions, refer to the “Miscellaneous Exceptions” chapter.
Otherwise, if instruction emulation is not enabled, this logic is omitted.