Date: Wed, 24 Oct 2012 13:34:16 +0300 From: Volodymyr Kostyrko <c.kworr@gmail.com> To: Dimitry Andric <dim@FreeBSD.org> Cc: freebsd-stable@freebsd.org Subject: Re: wine, gcc and clang with CPUTYPE Message-ID: <5087C428.2020908@gmail.com> In-Reply-To: <5087BD71.9090002@FreeBSD.org> References: <50879F62.2010004@gmail.com> <5087BD71.9090002@FreeBSD.org>
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24.10.2012 13:05, Dimitry Andric wrote: >> I just have taken some time to inspect CPUTYPE support for clang. It >> seems to me that clang generates incorrect code in some cases. >> >> The first failure point I discovered was inability to build gcc from >> sources or compile something with gcc. Code produced by gcc seem to fail >> whether this was gcc compiled from bootstrap or anything else: >> >> http://lists.freebsd.org/pipermail/freebsd-multimedia/2012-October/013469.html > > Can you attempt to figure out what the illegal instruction was, in that > case? How can I do that? I'm not very familiar with gdb. >> I started testing by commenting out CPUTYPE in make.conf. After first >> rebuild I also updated the ports and installed new version of >> wine-devel. And to my surprise it works like a charm. Rolling back to >> the world built with CPUTYPE=native makes wine break again. >> >> To my surprise CPUTYPE was not the cause of wine failure per se. Wine >> continues to work for k6, k6-3, athlon and athlon-tbird. But it >> completely fails when the world was built with athlon-4 and athlon-xp. >> >> Trying to recompile gcc I also found that everything works and yet again >> up to the athlon-tbird. >> >> My conclusion is: clang incorrectly produces code within one of core >> libraries (I haven't tested which one yet, but I suspect libgcc_s.so) >> when optimizing for athlon-4 or athlon-xp. > > On the problematic athlons, can you please post the exact CPUIDs from > dmesg? If you have WITH_CLANG_EXTRAS enabled, please also post the > output of "opt -version". Oct 24 01:47:20 limbo kernel: CPU: AMD Athlon(tm) XP 2500+ (1833.95-MHz 686-class CPU) Oct 24 01:47:20 limbo kernel: Origin = "AuthenticAMD" Id = 0x6a0 Family = 0x6 Model = 0xa Stepping = 0 Oct 24 01:47:20 limbo kernel: Features=0x383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE> Oct 24 01:47:20 limbo kernel: AMD Features=0xc0400800<SYSCALL,MMX+,3DNow!+,3DNow!> I will rebuild WITH_CLANG_EXTRAS. -- Sphinx of black quartz, judge my vow.
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