RE: [gentoo-user] Valid CFLAG?

[Aurelien Reynaud]

> Is this a valid CFLAG for pentium 3?
>
> CFLAGS="-march=pentium3 -mcpu=pentium3 -O3 -pipe"


Yes, this is valid, but redundant since -march=pentium3
implies -mcpu=pentium3
-mcpu uses only the i386 instruction set, but in a fashion adapted to the p3
architecture wrt cache size, cpu cycles cost, etc...
-march uses p3-specific instructions

Therefore -march is more optimized than -mcpu, but loses compatibility with
older cpus




Aurelien


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