nanogui: Thread: How to get the smallest code size with mipsel-linux-gcc

Hi,

I am wondering how to get the smallest code size with mipsel-linux-gcc.

My current command line looks something like this:
mipsel-linux-gcc -c -ansi -pedantic -O6 -fno-strength-reduce somefile.c

Is there some other option I can use to shrink it more?

I am thinking of the way the Intel CPU line is always a super set of the
predecessor, so that in theory, a PIII can run code snippets of an old
8080.  I am hoping that the same can be done for the MIPS processor,
regardless of other performance issues like speed,

Thanks!

Rob

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On Thu, 22 Feb 2001, Robert Hartley wrote:
> mipsel-linux-gcc -c -ansi -pedantic -O6 -fno-strength-reduce somefile.c
> Is there some other option I can use to shrink it more?

-O3 (and greater) enables automatic loop unrolling, which can increase the
code size quite a bit. Try -O2 or -Os instead. I've found experimentally
that on x86 -O2 is probably the best compromise of speed and code size,
whilst -Os is slightly smaller and quite a bit slower. I would guess
the Mips GCC probably behaves similarly.

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