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
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