Date: Sat, 12 Aug 2017 14:45:53 -0700 From: "Ngie Cooper (yaneurabeya)" <yaneurabeya@gmail.com> To: Ryan Libby <rlibby@FreeBSD.org> Cc: Ian Lepore <ian@freebsd.org>, src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org, Bruce Evans <brde@optusnet.com.au> Subject: Re: svn commit: r322418 - head/lib/msun/src Message-ID: <5672BE7A-0640-4C8B-9B41-44AD83D7B59E@gmail.com> In-Reply-To: <CAHgpiFwAAs8=pcpuwVCx-hNdPp3OXFESVdZ6=9fJ8kPwZiqVCg@mail.gmail.com> References: <201708112241.v7BMfP5X028262@repo.freebsd.org> <1502555191.47886.30.camel@freebsd.org> <CAHgpiFx=pDQA-dHNQJwqDQ%2B2iXJDkvVNsdmyBZG2EL%2BVJQCU4g@mail.gmail.com> <CAHgpiFwAAs8=pcpuwVCx-hNdPp3OXFESVdZ6=9fJ8kPwZiqVCg@mail.gmail.com>
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> On Aug 12, 2017, at 10:55, Ryan Libby <rlibby@FreeBSD.org> wrote:
=E2=80=A6
> A few possible quick fixes:
>=20
> - Change the {arm64,riscv,sparc64}/include/float.h LDBL_MAX_EXP
> definitions from (+16384) to 16384.
>=20
> - Change HALF_LDBL_MAX from
> #define HALF_LDBL_MAX __CONCAT(__CONCAT(0x0.8p, LDBL_MAX_EXP), L)
> to
> #if LDBL_MAX_EXP !=3D 0x4000
> #error "Unsupported long double format"
> #endif
> #define HALF_LDBL_MAX 0x0.8p16384L
>=20
> - Change the HALF_LDBL_MAX constant to a variable constructed with
> LD80C(), I think with
> LD80C(0x8000000000000000, 16383, 5.9486574767861588254e+4931L)
> but this also requires #error for LDBL_MAX_EXP !=3D 0x4000, so not
> really any better than the above.
>=20
> I think I will back the patch out for now and go back to review.
The issue is an inconsistency with how LDBL_MAX_EXP is defined in the MD =
headers:
$ grep -r LDBL_MAX_EXP sys/sparc64/
sys/sparc64/include/float.h:#define LDBL_MAX_EXP (+16384)
$ grep -r LDBL_MAX_EXP sys/x86/
sys/x86/include/float.h:#define LDBL_MAX_EXP 16384
Cheers,
-Ngie
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