ARM mcpu to march mapping

[Richard Earnshaw]

> Is there a functional mapping from the mcpu switches to march?
> Specifically, what march family does the strongarm1100 fall into? Do
> both these switches specify the instruction set available?
> 

Yes.  sa1100 is an ARMv4 processor.  -march will select the instructions 
that are legal to use for the compilation.  -mtune will tell the compiler 
to tune for best performance on that processor (within the constraints of 
the instruction set specified by -march).  -mcpu will set both options at 
once; think of it as a shorthand for -march=arch-of(cpu) -mtune=cpu.

R.


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