Hardware Model confusion

Sat May 14 11:24:00 GMT 2005

What are the major differences between object codes generated by GCC with 
parameters, "-march=r4000" and "-march=mips32"? Does the program compiled 
with parameter, "-march=mips32", only consist of instructions which belongs 
to the smallest subset defined in MIPS32 ISA Manual? For example, a program 
without FPU instructions, a program without instructions for a particular 
coprocessor and etc. In other words, are all optional features in MIPS32 
ISA neglected?
                                  CCH

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