What would be the -march setting for an AMD Athlon "Thunderbird" CPU? Thanks for any help, Steven On Thursday 23 August 2001 06:54 am, dids wrote:

Thanks I shall have a go with that later !!

dids

...

1. Yes 2. No 3. gcc -march=i686 ... or gcc -mcpu=i686

If you are compiling code with a configure script then use something like

CFLAGS="-O2 -march=i686" ./configure ... for C code, and CXXFLAGS="-O2 -march=i686" ./configure ... for C++ code

The difference between -mcpu and -march is that -mcpu optimises for the cputype given but runs on other cpus, -march optimises but doesn't guarantee to run on other cpus.

JDL

dids wrote:

...

[1] I'm just wondering if when you compile a program, GCC can optimise the code for use with your processor. [2] And if so, is it set to do this automatically ?

[3] If not, how and what would you put for a Pentium III ?

dids

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