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b58ddff026
* merged mpfr 3.0.0 and gmp 5.0.1 in buildtools trunk git-svn-id: file:///srv/svn/repos/haiku/buildtools/trunk@37378 a95241bf-73f2-0310-859d-f6bbb57e9c96
77 lines
2.9 KiB
C
77 lines
2.9 KiB
C
/* auxiliary data to generate special IEEE floats (NaN, +Inf, -Inf)
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Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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Contributed by the Arenaire and Cacao projects, INRIA.
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This file is part of the GNU MPFR Library.
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The GNU MPFR Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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The GNU MPFR Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
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http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
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51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* "double" NaN and infinities are written as explicit bytes to be sure of
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getting what we want, and to be sure of not depending on libm.
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Could use 4-byte "float" values and let the code convert them, but it
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seems more direct to give exactly what we want. Certainly for gcc 3.0.2
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on alphaev56-unknown-freebsd4.3 the NaN must be 8-bytes, since that
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compiler+system was seen incorrectly converting from a "float" NaN. */
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#if _GMP_IEEE_FLOATS
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/* The "d" field guarantees alignment to a suitable boundary for a double.
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Could use a union instead, if we checked the compiler supports union
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initializers. */
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struct dbl_bytes {
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unsigned char b[8];
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double d;
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};
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#define MPFR_DBL_INFP (* (const double *) dbl_infp.b)
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#define MPFR_DBL_INFM (* (const double *) dbl_infm.b)
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#define MPFR_DBL_NAN (* (const double *) dbl_nan.b)
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#if HAVE_DOUBLE_IEEE_LITTLE_ENDIAN
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static const struct dbl_bytes dbl_infp =
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{ { 0, 0, 0, 0, 0, 0, 0xF0, 0x7F }, 0.0 };
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static const struct dbl_bytes dbl_infm =
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{ { 0, 0, 0, 0, 0, 0, 0xF0, 0xFF }, 0.0 };
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static const struct dbl_bytes dbl_nan =
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{ { 0, 0, 0, 0, 0, 0, 0xF8, 0x7F }, 0.0 };
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#endif
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#if HAVE_DOUBLE_IEEE_LITTLE_SWAPPED
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static const struct dbl_bytes dbl_infp =
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{ { 0, 0, 0xF0, 0x7F, 0, 0, 0, 0 }, 0.0 };
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static const struct dbl_bytes dbl_infm =
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{ { 0, 0, 0xF0, 0xFF, 0, 0, 0, 0 }, 0.0 };
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static const struct dbl_bytes dbl_nan =
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{ { 0, 0, 0xF8, 0x7F, 0, 0, 0, 0 }, 0.0 };
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#endif
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#if HAVE_DOUBLE_IEEE_BIG_ENDIAN
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static const struct dbl_bytes dbl_infp =
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{ { 0x7F, 0xF0, 0, 0, 0, 0, 0, 0 }, 0.0 };
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static const struct dbl_bytes dbl_infm =
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{ { 0xFF, 0xF0, 0, 0, 0, 0, 0, 0 }, 0.0 };
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static const struct dbl_bytes dbl_nan =
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{ { 0x7F, 0xF8, 0, 0, 0, 0, 0, 0 }, 0.0 };
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#endif
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#else /* _GMP_IEEE_FLOATS */
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#define MPFR_DBL_INFP DBL_POS_INF
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#define MPFR_DBL_INFM DBL_NEG_INF
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#define MPFR_DBL_NAN DBL_NAN
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#endif /* _GMP_IEEE_FLOATS */
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