> As far as I can tell from the MIPS documentation, only a MIPS64 > processor would have 64-bit wide FP registers.
However, these 64-bit > specific instructions that only work on such a processor are part of > the MIPS32 revision 2 ISA for some strange reason--they just have > "unpredictable" affects if ever run on a MIPS32 processor. Since it's unpredictable effects then simply warning and/or failing on that instruction would be OK. If you are so inclined, you can handle this through the instruction formats (arch/mips/isa/...) as I may have mentioned earlier. Basically all of those 64-bit instructions need to check the appropriate control register that specifies if a 64-bit FPU is available and if so proceed, but if not warn/fail. -- - Korey
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