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authorJoseph Myers <joseph@codesourcery.com>2017-08-31 16:39:25 +0000
committerJoseph Myers <joseph@codesourcery.com>2017-08-31 16:39:25 +0000
commitc0c49d60cfeff3b2aa801d6598143a073989654a (patch)
tree248bd1a808a8f2e27396ddfd1c04e5362d7e5da2 /sysdeps/mips
parent5ef1b2138d4236bb3616e612c5bc4dc328a9ffb2 (diff)
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Simplify NAN definitions.
Similar to my patches for HUGE_VAL and INFINITY. this patch eliminates the bits/nan.h headers. __builtin_nanf ("") is used to define NAN for GCC 3.3 and later; the fallback is (0.0f / 0.0f), which is a constant expression for a quiet NaN of type float, but raises a spurious "invalid" exception outside static initializers, which seems the best that can be done purely in standard C. Again, if anyone actually uses a compiler with its own incompatible extension for producing a constant quiet NaN, we can add compiler conditionals. Tested for x86_64. * math/math.h [__USE_ISOC99] (NAN): Define directly here. Do not include <bits/nan.h>. * math/Makefile (headers): Remove bits/nan.h. * bits/nan.h: Remove. * sysdeps/ieee754/bits/nan.h: Likewise. * sysdeps/mips/bits/nan.h: Likewise.
Diffstat (limited to 'sysdeps/mips')
-rw-r--r--sysdeps/mips/bits/nan.h67
1 files changed, 0 insertions, 67 deletions
diff --git a/sysdeps/mips/bits/nan.h b/sysdeps/mips/bits/nan.h
deleted file mode 100644
index a4a1ef9..0000000
--- a/sysdeps/mips/bits/nan.h
+++ /dev/null
@@ -1,67 +0,0 @@
-/* `NAN' constant for IEEE 754 machines. MIPS version.
- Copyright (C) 1992-2017 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-#ifndef _MATH_H
-# error "Never use <bits/nan.h> directly; include <math.h> instead."
-#endif
-
-
-/* IEEE Not A Number. */
-/* In legacy-NaN mode MIPS has the qNaN and sNaN patterns reversed
- compared to most other architectures. IEEE 754-1985 left the
- definition of this open to implementations, and for MIPS the top bit
- of the mantissa must be SET to indicate a sNaN. In 2008-NaN mode
- MIPS aligned to IEEE 754-2008. */
-
-#if __GNUC_PREREQ(3,3)
-
-# define NAN (__builtin_nanf (""))
-
-#elif defined __GNUC__
-
-/* No 2008-NaN mode support in any GCC version before 4.9. */
-
-# define NAN \
- (__extension__ \
- ((union { unsigned __l __attribute__ ((__mode__ (__SI__))); float __d; }) \
- { __l: 0x7fbfffffUL }).__d)
-
-#else
-
-# include <endian.h>
-
-# if __BYTE_ORDER == __BIG_ENDIAN
-# ifdef __mips_nan2008
-# define __qnan_bytes { 0x7f, 0xc0, 0, 0 }
-# else
-# define __qnan_bytes { 0x7f, 0xbf, 0xff, 0xff }
-# endif
-# endif
-# if __BYTE_ORDER == __LITTLE_ENDIAN
-# ifdef __mips_nan2008
-# define __qnan_bytes { 0, 0, 0xc0, 0x7f }
-# else
-# define __qnan_bytes { 0xff, 0xff, 0xbf, 0x7f }
-# endif
-# endif
-
-static union { unsigned char __c[4]; float __d; } __qnan_union
- __attribute__ ((__unused__)) = { __qnan_bytes };
-# define NAN (__qnan_union.__d)
-
-#endif /* GCC. */