Date: Mon, 22 Sep 2014 07:50:56 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Rui Paulo <rpaulo@me.com> Cc: freebsd-toolchain@freebsd.org, Steve Kargl <sgk@troutmask.apl.washington.edu> Subject: Re: Is this a compiler bug? Message-ID: <8B883BB9-8A59-4197-A69D-210229F8EA86@FreeBSD.org> In-Reply-To: <2EB3354D-0F65-4A79-A378-7F397911284A@me.com> References: <20140922011946.GA4317@troutmask.apl.washington.edu> <670269FD-F75F-4044-8F3C-0260F58A70E2@me.com> <20140922014853.GA4469@troutmask.apl.washington.edu> <2EB3354D-0F65-4A79-A378-7F397911284A@me.com>
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--Apple-Mail=_F81B6876-05B0-4F20-A886-279FA219CE07 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On 22 Sep 2014, at 04:20, Rui Paulo <rpaulo@me.com> wrote: > On Sep 21, 2014, at 18:48, Steve Kargl = <sgk@troutmask.apl.washington.edu> wrote: >> On Sun, Sep 21, 2014 at 06:38:48PM -0700, Rui Paulo wrote: >>> On Sep 21, 2014, at 18:19, Steve Kargl = <sgk@troutmask.apl.washington.edu> wrote: >>>>=20 >>>> #include <stdio.h> >>>> #include <stdint.h> >>>>=20 >>>> int >>>> main(void) >>>> { >>>> uint16_t i; >>>> i =3D 0x3ff0+63; printf("%x\n", i); >>>> i =3D 0x3ff1+63; printf("%x\n", i); >>>> i =3D 0x3ff2+63; printf("%x\n", i); >>>> i =3D 0x3ff3+63; printf("%x\n", i); >>>> i =3D 0x3ff4+63; printf("%x\n", i); >>>> i =3D 0x3ff4+63; printf("%x\n", i); >>>> i =3D 0x3ff6+63; printf("%x\n", i); >>>> i =3D 0x3ff7+63; printf("%x\n", i); >>>> i =3D 0x3ff8+63; printf("%x\n", i); >>>> i =3D 0x3ff9+63; printf("%x\n", i); >>>> i =3D 0x3ffa+63; printf("%x\n", i); >>>> i =3D 0x3ffb+63; printf("%x\n", i); >>>> i =3D 0x3ffc+63; printf("%x\n", i); >>>> i =3D 0x3ffd+63; printf("%x\n", i); >>>> i =3D 0x3ffe+63; printf("%x\n", i); >>>> i =3D 0x3fff+63; printf("%x\n", i); >>>> return 0; >>>> } >>>=20 >>> Looks like it. Please file a bug report with LLVM. >>>=20 >>=20 >> Unfortunately, llvm requires an account to report bugs. >=20 > I think I know what's happening: "e" is being parsed as scientific = notation. Yes, this is an unfortunate side effect of hexadecimal float notation (either in C99, or as a gcc extension [1]). -Dimitry [1] https://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html --Apple-Mail=_F81B6876-05B0-4F20-A886-279FA219CE07 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.22 (Darwin) iEYEARECAAYFAlQfuMsACgkQsF6jCi4glqOC5QCeL64bAJ76XcUVZPm3zn2GplKj rz0Anir6ua7NijYzURLGn4ooOLLrxpEJ =oDxV -----END PGP SIGNATURE----- --Apple-Mail=_F81B6876-05B0-4F20-A886-279FA219CE07--
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