From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Arnd Bergmann To: cbe-oss-dev@ozlabs.org Subject: Re: [Cbe-oss-dev] [RFC, PATCH] selection of CPU optimization Date: Thu, 12 Apr 2007 19:26:03 +0200 References: <20070410111508.GA2969@localhost.localdomain> <200704121501.34311.arnd@arndb.de> <981B07C8-D35B-4581-8FC7-DCA58430A081@kernel.crashing.org> In-Reply-To: <981B07C8-D35B-4581-8FC7-DCA58430A081@kernel.crashing.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Message-Id: <200704121926.03723.arnd@arndb.de> Cc: linuxppc-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thursday 12 April 2007, Kumar Gala wrote: > > +config PPC_CPU_ANY32 > > + bool "Generic 32 bit PowerPC" > > + depends on PPC_6xx || PPC_8xx || 4xx || E200 || E500 > > + select PPC_ENABLE_ALTIVEC > > What is PPC_ENABLE_ALTIVEC used for? The idea was that PPC_ENABLE_ALTIVEC is selected when PPC_ALTIVEC _can_ be enabled, while PPC_ALTIVEC is selected by some CPUs directly. I now remember that I had not done this part right in the patch I posted. The correct behavior should be something like choice prompt "Processor level" config PPC_CPU_740 bool "G3 or higher" select PPC_ENABLE_ALTIVEC # altivec is possible config PPC_CPU_86xx bool "86xx" select PPC_ALTIVEC # altivec is required config PPC_CPU_4xx bool "4xx" # altivec is not possible endchoice config PPC_ENABLE_ALTIVEC bool config PPC_ALTIVEC bool "Enable the use of Altivec" depends on PPC_ENABLE_ALTIVEC I'll fix this up in the next version, which should also be split into simpler patches. > > +config PPC_CPU_FLAG > > + string > > + default "" if PPC_CPU_UNSPECIFIED > > + default "-mcpu=powerpc64" if PPC_CPU_ANY64 > > + default "-mcpu=rs64" if PPC_CPU_RS64 > > + default "-mcpu=power3" if PPC_CPU_POWER3 > > + default "-mcpu=power4" if PPC_CPU_POWER4 > > + default "-mcpu=power5" if PPC_CPU_POWER5 > > + default "-mcpu=power5+" if PPC_CPU_POWER5PLUS > > + default "-mcpu=power6" if PPC_CPU_POWER6 > > + default "-mcpu=970" if PPC_CPU_970 > > + default "" if PPC_CPU_CELLBE > > + default "" if PPC_CPU_PA6T > > + default "-mcpu=powerpc" if PPC_CPU_ANY32 > > + default "-mcpu=601" if PPC_CPU_601 > > + default "-mcpu=603" if PPC_CPU_603 > > + default "-mcpu=604" if PPC_CPU_604 > > + default "-mcpu=750" if PPC_CPU_750 > > + default "-mcpu=7400" if PPC_CPU_7400 > > + default "-mcpu=7450" if PPC_CPU_7450 > > + default "-mcpu=801" if PPC_CPU_801 > > + default "-mcpu=821" if PPC_CPU_821 > > + default "-mcpu=823" if PPC_CPU_823 > > + default "-mcpu=860" if PPC_CPU_860 > > + default "-mcpu=403" if PPC_CPU_403 > > + default "-mcpu=405" if PPC_CPU_405 > > + default "-mcpu=440" if PPC_CPU_440 > > + default "" if PPC_CPU_E200 > > + default "" if PPC_CPU_E500 > > I think -mcpu=8540 will work for e500 (same for tune) Interestingly, -mcpu=8540 is known to gcc, according to gcc-4.0.3 -dumpspecs, but is not listed in the documentation. There is also -me500, while -me200 seems to be known only to gas but not gcc. What would be the right options to pass on e200 and on pa6t? > > +config PPC_OF_PLATFORM_PCI > > + bool > > + depends on PPC64 # not supported on 32 bits yet > > + default n > > Should this really be in here? I don't see how OF PCI has anything to > do with CPU/core. Right. Arnd <><