From: Piotr Kubaj <pkubaj@anongoth.pl>
To: "Kewen.Lin" <linkw@linux.ibm.com>
Cc: Segher Boessenkool <segher@kernel.crashing.org>,
gcc-patches@gcc.gnu.org, fortran@gcc.gnu.org
Subject: Re: [PATCH V2] powerpc: properly check for feenableexcept() on FreeBSD
Date: Fri, 13 May 2022 12:34:05 +0200 [thread overview]
Message-ID: <Yn40HQyWk5+Vr2jz@KGPE-D16> (raw)
In-Reply-To: <56585bab-71b3-1713-d8ed-bed80cfe5ec4@linux.ibm.com>
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On 22-05-13 10:59:59, Kewen.Lin wrote:
> on 2022/5/13 04:16, Segher Boessenkool wrote:
> > Hi Piotr,
> >
> > On Tue, May 03, 2022 at 12:21:12PM +0200, pkubaj@FreeBSD.org wrote:
> >> FreeBSD/powerpc* has feenableexcept() defined in fenv.h header.
> >
> > Declared, not defined. These are required to be real functions (on all
> > platforms that have these functions), not macros or inlines or whatever.
> >
>
> Piotr's reply "FreeBSD doesn't have this function in libm, it's
> implemented in /usr/include/fenv.h." from [1] made me feel like
> it's a definition instead of declaration. So I thought the check
> should use AC_LINK_IFELSE instead, since one fenv.h which doesn't
> have the definition can still pass the proposed AC_COMPILE_IFELSE
> check.
>
> I just did a further search, the powerpc fenv.h [2] does include
> the definition of feenableexcept. By comparison, the x86 fenv.h [3]
> doesn't. But I'm not sure if it's the same as what Piotr's
> environments have. Hope it's similar. :-)
>
> [1] https://gcc.gnu.org/pipermail/gcc-patches/2022-April/593193.html
> [2] https://github.com/freebsd/freebsd-src/blob/main/lib/msun/powerpc/fenv.h
> [3] https://github.com/freebsd/freebsd-src/blob/main/lib/msun/x86/fenv.h
Yes, it's a definition and thanks for confirming that. As for why it's not in libm, I asked a developer about that:
03:04 <@adalava> It shouldn't be difficulted but I moved to other thing after months looking at FPE in kernel, bugs in context switch and msun test cases failing :-P
As far as I know, there are currently no plans to move it to libm on powerpc. riscv, arm and arm64 are in the same boat.
I will follow with a next patch that will check for feenableexcept() in fenv.h if libm check is unsuccessful.
Thanks,
Piotr Kubaj.
>
> BR,
> Kewen
>
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next prev parent reply other threads:[~2022-05-13 10:34 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-03 10:21 pkubaj
2022-05-03 10:33 ` Piotr Kubaj
2022-05-10 23:32 ` Piotr Kubaj
2022-05-12 7:20 ` Kewen.Lin
2022-05-12 20:16 ` Segher Boessenkool
2022-05-13 2:59 ` Kewen.Lin
2022-05-13 10:34 ` Piotr Kubaj [this message]
2022-05-13 12:53 ` Segher Boessenkool
2022-05-14 5:46 ` Piotr Kubaj
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