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Date: Tue, 8 Nov 2011 22:09:05 +0100
From: Roman Divacky <rdivacky@freebsd.org>
To: Alexander Best <arundel@freebsd.org>
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Cc: freebsd-toolchain@freebsd.org, Dimitry Andric <dim@FreeBSD.org>
Subject: Re: CPUTYPE=native handling
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clang will use "core2" for family=6 and model=15

check llvm/lib/Support/Host.cpp

what is the problem? The fact that our gcc from the middle-ages
does not recognize that?

On Tue, Nov 08, 2011 at 09:04:20PM +0000, Alexander Best wrote:
> On Tue Nov  8 11, Roman Divacky wrote:
> > On Tue, Nov 08, 2011 at 08:55:39AM +0100, Dimitry Andric wrote:
> > > On 2011-11-08 01:25, Alexander Best wrote:
> > > > i've seen dozens of issues, where people set CPUTYPE=native. although this
> > > > works in a lot of cases, it doesn't in others. why don't we simply add
> > > > something like
> > > > 
> > > > . if ${CPUTYPE} == "native"
> > > > .  error "bla"
> > > > . endif
> > > > 
> > > > in share/mk/bsd.cpu.mk for now? or at least for the archs, where "native" is
> > > > known to cause problems.
> > > 
> > > What does this solve?  Don't you think it is better to try to fix the
> > > actual problems?  Some people like being able to optimize for their
> > 
> > Yes, we definitely should aim for fixing the problems instead of working
> > around them.
> > 
> > This way both clang and freebsd benefits.
> 
> for me -march=native reports:
> 
> otaku% gcc -march=native -E -v - </dev/null
> Using built-in specs.
> Target: amd64-undermydesk-freebsd
> Configured with: FreeBSD/amd64 system compiler
> Thread model: posix
> gcc version 4.2.2 20070831 prerelease [FreeBSD]
>  /usr/libexec/cc1 -E -quiet -v -D_LONGLONG - -march=nocona -mtune=generic
> #include "..." search starts here:
> #include <...> search starts here:
>  /usr/include/gcc/4.2
>  /usr/include
> End of search list.
> # 1 "<stdin>"
> # 1 "<built-in>"
> # 1 "<command-line>"
> # 1 "<stdin>"
> 
> where instead of nocona, core2 would have been the better choice:
> 
> [1.000000] CPU: Intel(R) Pentium(R) Dual  CPU  E2160  @ 1.80GHz (1800.00-MHz K8-class CPU)
> [1.000000]   Origin = "GenuineIntel"  Id = 0x6fd  Family = 6  Model = f  Stepping = 13
> [1.000000]   Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
> [1.000000]   Features2=0xe39d<SSE3,DTES64,MON,DS_CPL,EST,TM2,SSSE3,CX16,xTPR,PDCM>
> [1.000000]   AMD Features=0x20100800<SYSCALL,NX,LM>
> [1.000000]   AMD Features2=0x1<LAHF>
> [1.000000]   TSC: P-state invariant, performance statistics
> 
> cheers.
> alex
> 
> > 
> > roman