Hi, I heard this gnasty rumor attached below that says that GCC can't optimize any differently between any of the P6 or later processors, so that -march=pentiumpro and -march=pentium2 for example will always compile the same. I have not been able to find anything in the GCC documentation, buglist, or limitations list that suggests that this is the case. Is what this developer telling me true? Thanks, William ---- Original message ---- >Date: 21 Jul 2003 07:39:16 +0100 >From: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> >Subject: Re: [Fwd: Re: Kernel 2.4 CPU Arch issues] >To: "William M. Quarles" <quarlewm@xxxxxxx> >Cc: Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx> > >On Llu, 2003-07-21 at 01:25, William M. Quarles wrote: >> Well, wouldn't changing the gcc -march option and/or adding -mcpu >> options for the various processors in the Makefile make a difference, as >> the patchfile suggests? > >Currently - no. gcc knows a lot more processor names that require individual >unique optimisation > -- William M. Quarles quarlewm@xxxxxxx walrus@xxxxxxxxxxxxx
