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Message-Id: <200712072258.19331.arnd@arndb.de> Date: Fri, 7 Dec 2007 22:58:17 +0100 From: Arnd Bergmann <arnd@...db.de> To: linuxppc-dev@...abs.org, balbir@...ux.vnet.ibm.com Cc: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] Fake NUMA emulation for PowerPC On Friday 07 December 2007, Balbir Singh wrote: > Balbir Singh wrote: > > Geert Uytterhoeven wrote: > >> On Sat, 8 Dec 2007, Balbir Singh wrote: > >>> + if (strstr(p, "fake=")) > >>> + cmdline = p + 5; /* 5 is faster than strlen("fake=") */ > >> Really? My gcc is smart enough to replace the `strlen("fake=")' by 5, even > >> without -O. > >> > > > > Thanks for pointing that out, but I am surprised that a compiler would > > interpret library routines like strlen. > > > > I just tested it and it turns out that you are right. I'll go hunt to > see where gcc gets its magic powers from. > Even if it wasn't: Why the heck would you want to optimize this? The function is run _once_ at boot time and the object code gets thrown away afterwards! Arnd <>< -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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