Date: Thu, 8 Sep 2016 12:37:53 -0700 From: Mark Millard <markmi@dsl-only.net> To: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Re: From llvm: Fwd: [Bug 26519] Clang 3.8.0's "Target: powerpc-unknown-freebsd11.0" code generation is violating the SVR4 ABI (SEGV can result) [fixed in llvm -r280705] Message-ID: <EB82D9DC-4868-4075-B02E-BEC3A241C9A9@dsl-only.net>
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Krzysztof Parzyszek kristof at swissmail.org on Thu Sep 8 13:01:44 UTC 2016 wrote: > Thanks, this helps. The kernel may not need this, but in general > soft-float needs to generate library calls for floating-point > operations. Is there a library for those for powerpc64? The compiler > will need to know at least the names and parameters of these functions. > > -Krzysztof http://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20160523/159625.html for the recent enabling of adding soft-float for sparc says: > The user should ensure a library (such as the builtins from Compiler-RT) that includes the software floating point routines is provided. As I read this it appears that the library has to match the compiler, instead of the compiler being made to match the library --and at least sometimes compiler-rt has that matching material. Since TARGET_ARCH=powerpc has the soft-float support I looked in: https://svnweb.freebsd.org/base/stable/11/contrib/compiler-rt/lib/builtins/ppc/ and see that it has: DD.h divtc3.c fixrfdi.c floatunstfdi.c floatditf.c floatunditf.c gcc_qadd.c gcc_qdiv.c gcc_qmul.c gcc_qsub.c multc3.c restFP.S saveFP.S Note that FreeBSD is not the originator of compiler-rt. Instead FreeBSD takes compiler-rt in from outside: the above is from some variant/version of what is for truck visible at: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/builtins/ppc/ I do not know what would need to be different for TARGET_ARCH=powerpc64 . By contrast https://svnweb.freebsd.org/base/stable/11/contrib/compiler-rt/lib/builtins/sparc64/ has: divmod.m4 divsi3.S generate.sh modsi3.S udivsi3.S umodsi3.S But there seems to be no match on llvm.org for these for sparc64. So sometimes FreeBSD does have unique material in compiler-rt. As for more generic material common across architectures: https://svnweb.freebsd.org/base/stable/11/contrib/compiler-rt/lib/builtins/ and (showing trunk again) http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/builtins/ have more generic material, including more floating-point material. (I'll not list it all.) Side note: Attempting to CC you on an earlier message got a non-delivery notice that said, in part: Connected to mail3.swissmail.org:212.25.22.133 but recipient was rejected. STARTTLS proto=TLSv1; cipher=DHE-RSA-AES256-SHA. Remote host said: 450 4.2.0 <kristof at swissmail.org>: Recipient address rejected: Greylisted, see http://postgrey.schweikert.ch/help/swissmail.org.html (There is a " at " replacement in the above that was not in the original.) === Mark Millard markmi at dsl-only.nethelp
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