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Simplify HUGE_VAL definitions.
There are various bits/huge_val*.h headers to define HUGE_VAL and related macros. All of them use __builtin_huge_val etc. for GCC 3.3 and later. Then there are various fallbacks, such as using a large hex float constant for GCC 2.96 and later, or using unions (with or without compound literals) to construct the bytes of an infinity, with this last being the reason for having architecture-specific files. Supporting TS 18661-3 _FloatN / _FloatNx types that have the same format as other supported types will mean adding more such macros; needing to add more headers for them doesn't seem very desirable. The fallbacks based on bytes of the representation of an infinity do not meet the standard requirements for a constant expression. At least one of them is also wrong: sysdeps/sh/bits/huge_val.h is producing a mixed-endian representation which does not match what GCC does. This patch eliminates all those headers, defining the macros directly in math.h. For GCC 3.3 and later, the built-in functions are used as now. For other compilers, a large constant 1e10000 (with appropriate suffix) is used. This is like the fallback for GCC 2.96 and later, but without using hex floats (which have no apparent advantage here). It is unambiguously valid standard C for all floating-point formats with infinities, which covers all formats supported by glibc or likely to be supported by glibc in future (C90 DR#025 said that if a floating-point format represents infinities, all real values lie within the range of representable values, so the constraints for constant expressions are not violated), but may generate compiler warnings and wouldn't handle the TS 18661-1 FENV_ROUND pragma correctly. If someone is actually using a compiler with glibc that does not claim to be GCC 3.3 or later, but which has a better way to define the HUGE_VAL macros, we can always add compiler conditionals in with alternative definitions. I intend to make similar changes for INF and NAN. The SNAN macros already just use __builtin_nans etc. with no fallback for compilers not claiming to be GCC 3.3 or later. Tested for x86_64. * math/math.h: Do not include bits/huge_val.h, bits/huge_valf.h, bits/huge_vall.h or bits/huge_val_flt128.h. (HUGE_VAL): Define directly here. [__USE_ISOC99] (HUGE_VALF): Likewise. [__USE_ISOC99] (HUGE_VALL): Likewise. [__HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)] (HUGE_VAL_F128): Likewise. * math/Makefile (headers): Remove bits/huge_val.h, bits/huge_valf.h, bits/huge_vall.h and bits/huge_val_flt128.h. * bits/huge_val.h: Remove. * bits/huge_val_flt128.h: Likewise. * bits/huge_valf.h: Likewise. * bits/huge_vall.h: Likewise. * sysdeps/ia64/bits/huge_vall.h: Likewise. * sysdeps/ieee754/bits/huge_val.h: Likewise. * sysdeps/ieee754/bits/huge_valf.h: Likewise. * sysdeps/m68k/m680x0/bits/huge_vall.h: Likewise. * sysdeps/sh/bits/huge_val.h: Likewise. * sysdeps/sparc/bits/huge_vall.h: Likewise. * sysdeps/x86/bits/huge_vall.h: Likewise.
This commit is contained in:
Joseph Myers
parent
17e00cc69e
commit
a60eca2e55
23
ChangeLog
23
ChangeLog
@ -1,3 +1,26 @@
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2017-08-31 Joseph Myers <joseph@codesourcery.com>
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* math/math.h: Do not include bits/huge_val.h, bits/huge_valf.h,
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bits/huge_vall.h or bits/huge_val_flt128.h.
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(HUGE_VAL): Define directly here.
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[__USE_ISOC99] (HUGE_VALF): Likewise.
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[__USE_ISOC99] (HUGE_VALL): Likewise.
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[__HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)]
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(HUGE_VAL_F128): Likewise.
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* math/Makefile (headers): Remove bits/huge_val.h,
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bits/huge_valf.h, bits/huge_vall.h and bits/huge_val_flt128.h.
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* bits/huge_val.h: Remove.
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* bits/huge_val_flt128.h: Likewise.
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* bits/huge_valf.h: Likewise.
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* bits/huge_vall.h: Likewise.
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* sysdeps/ia64/bits/huge_vall.h: Likewise.
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* sysdeps/ieee754/bits/huge_val.h: Likewise.
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* sysdeps/ieee754/bits/huge_valf.h: Likewise.
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* sysdeps/m68k/m680x0/bits/huge_vall.h: Likewise.
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* sysdeps/sh/bits/huge_val.h: Likewise.
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* sysdeps/sparc/bits/huge_vall.h: Likewise.
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* sysdeps/x86/bits/huge_vall.h: Likewise.
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2017-08-31 Florian Weimer <fweimer@redhat.com>
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* elf/dl-addr-obj.c (_dl_addr_inside_object): Remove
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@ -1,28 +0,0 @@
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/* Stub `HUGE_VAL' constant.
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Used by <stdlib.h> and <math.h> functions for overflow.
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Copyright (C) 1992-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _MATH_H
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# error "Never use <bits/huge_val.h> directly; include <math.h> instead."
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#endif
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#if __GNUC_PREREQ(3,3)
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# define HUGE_VAL (__builtin_huge_val())
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#else
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# define HUGE_VAL 1e37
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#endif
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@ -1,23 +0,0 @@
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/* Default `HUGE_VAL_F128' constant.
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Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _MATH_H
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# error "Never use <bits/huge_val_flt128.h> directly; include <math.h> instead."
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#endif
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#define HUGE_VAL_F128 (__builtin_huge_valf128 ())
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@ -1,28 +0,0 @@
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/* Stub `HUGE_VALF' constant.
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Used by <stdlib.h> and <math.h> functions for overflow.
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Copyright (C) 1992-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _MATH_H
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# error "Never use <bits/huge_valf.h> directly; include <math.h> instead."
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#endif
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#if __GNUC_PREREQ(3,3)
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# define HUGE_VALF (__builtin_huge_valf())
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#else
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# define HUGE_VALF 1e37f
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#endif
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@ -1,28 +0,0 @@
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/* Default `HUGE_VALL' constant.
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Used by <stdlib.h> and <math.h> functions for overflow.
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Copyright (C) 1992-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _MATH_H
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# error "Never use <bits/huge_vall.h> directly; include <math.h> instead."
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#endif
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#if __GNUC_PREREQ(3,3)
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# define HUGE_VALL (__builtin_huge_vall())
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#else
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# define HUGE_VALL ((long double) HUGE_VAL)
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#endif
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@ -22,15 +22,15 @@ subdir := math
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include ../Makeconfig
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# Installed header files.
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headers := math.h bits/mathcalls.h bits/mathinline.h bits/huge_val.h \
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bits/huge_valf.h bits/huge_vall.h bits/inf.h bits/nan.h \
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headers := math.h bits/mathcalls.h bits/mathinline.h \
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bits/inf.h bits/nan.h \
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fpu_control.h complex.h bits/cmathcalls.h fenv.h \
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bits/fenv.h bits/fenvinline.h bits/mathdef.h tgmath.h \
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bits/math-finite.h bits/math-vector.h \
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bits/libm-simd-decl-stubs.h bits/iscanonical.h \
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bits/flt-eval-method.h bits/fp-fast.h bits/fp-logb.h \
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bits/long-double.h bits/mathcalls-helper-functions.h \
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bits/floatn.h bits/huge_val_flt128.h
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bits/floatn.h
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# FPU support code.
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aux := setfpucw fpu_control
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25
math/math.h
25
math/math.h
@ -37,18 +37,27 @@ __BEGIN_DECLS
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/* Gather machine dependent type support. */
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#include <bits/floatn.h>
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/* Get machine-dependent HUGE_VAL value (returned on overflow).
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On all IEEE754 machines, this is +Infinity. */
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#include <bits/huge_val.h>
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/* Value returned on overflow. On all IEEE754 machines, this is
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+Infinity. */
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#if __GNUC_PREREQ (3, 3)
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# define HUGE_VAL (__builtin_huge_val ())
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#else
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# define HUGE_VAL 1e10000
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#endif
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#ifdef __USE_ISOC99
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# if __GNUC_PREREQ (3, 3)
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# define HUGE_VALF (__builtin_huge_valf ())
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# define HUGE_VALL (__builtin_huge_vall ())
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# else
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# define HUGE_VALF 1e10000f
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# define HUGE_VALL 1e10000L
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# endif
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#endif
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#if __HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)
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# include <bits/huge_val_flt128.h>
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# define HUGE_VAL_F128 (__builtin_huge_valf128 ())
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#endif
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#ifdef __USE_ISOC99
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# include <bits/huge_valf.h>
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# include <bits/huge_vall.h>
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/* Get machine-dependent INFINITY value. */
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# include <bits/inf.h>
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@ -1,41 +0,0 @@
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/* `HUGE_VALL' constant for ia64 (where it is infinity).
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Used by <stdlib.h> and <math.h> functions for overflow.
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Copyright (C) 2000-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _MATH_H
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# error "Never use <bits/huge_vall.h> directly; include <math.h> instead."
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#endif
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#if __GNUC_PREREQ(3,3)
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# define HUGE_VALL (__builtin_huge_vall())
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#elif __GNUC_PREREQ(2,96)
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# define HUGE_VALL (__extension__ 0x1.0p32767L)
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#else
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# define __HUGE_VALL_bytes { 0,0,0,0,0,0,0, 0x80, 0xff, 0x7f, 0,0,0,0,0,0}
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# define __huge_vall_t union { unsigned char __c[16]; long double __ld; }
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# ifdef __GNUC__
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# define HUGE_VALL (__extension__ \
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((__huge_vall_t) { __c: __HUGE_VALL_bytes }).__ld)
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# else /* Not GCC. */
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static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes };
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# define HUGE_VALL (__huge_vall.__ld)
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# endif /* GCC. */
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#endif /* GCC 2.95 */
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@ -1,53 +0,0 @@
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/* `HUGE_VAL' constant for IEEE 754 machines (where it is infinity).
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Used by <stdlib.h> and <math.h> functions for overflow.
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Copyright (C) 1992-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
|
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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|
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _MATH_H
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# error "Never use <bits/huge_val.h> directly; include <math.h> instead."
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#endif
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/* IEEE positive infinity (-HUGE_VAL is negative infinity). */
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#if __GNUC_PREREQ(3,3)
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# define HUGE_VAL (__builtin_huge_val())
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#elif __GNUC_PREREQ(2,96)
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# define HUGE_VAL (__extension__ 0x1.0p2047)
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#elif defined __GNUC__
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# define HUGE_VAL \
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(__extension__ \
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((union { unsigned __l __attribute__((__mode__(__DI__))); double __d; }) \
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{ __l: 0x7ff0000000000000ULL }).__d)
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#else /* not GCC */
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# include <endian.h>
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typedef union { unsigned char __c[8]; double __d; } __huge_val_t;
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# if __BYTE_ORDER == __BIG_ENDIAN
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# define __HUGE_VAL_bytes { 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 }
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# endif
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# if __BYTE_ORDER == __LITTLE_ENDIAN
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# define __HUGE_VAL_bytes { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f }
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# endif
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static __huge_val_t __huge_val = { __HUGE_VAL_bytes };
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# define HUGE_VAL (__huge_val.__d)
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#endif /* GCC. */
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@ -1,51 +0,0 @@
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/* `HUGE_VALF' constant for IEEE 754 machines (where it is infinity).
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Used by <stdlib.h> and <math.h> functions for overflow.
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Copyright (C) 1992-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
|
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|
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The GNU C Library is free software; you can redistribute it and/or
|
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modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
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version 2.1 of the License, or (at your option) any later version.
|
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|
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The GNU C Library is distributed in the hope that it will be useful,
|
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but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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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
|
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<http://www.gnu.org/licenses/>. */
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#ifndef _MATH_H
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# error "Never use <bits/huge_valf.h> directly; include <math.h> instead."
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#endif
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/* IEEE positive infinity (-HUGE_VAL is negative infinity). */
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#if __GNUC_PREREQ(3,3)
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# define HUGE_VALF (__builtin_huge_valf())
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#elif __GNUC_PREREQ(2,96)
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# define HUGE_VALF (__extension__ 0x1.0p255f)
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#elif defined __GNUC__
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# define HUGE_VALF \
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(__extension__ \
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((union { unsigned __l __attribute__((__mode__(__SI__))); float __d; }) \
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{ __l: 0x7f800000UL }).__d)
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#else /* not GCC */
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typedef union { unsigned char __c[4]; float __f; } __huge_valf_t;
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# if __BYTE_ORDER == __BIG_ENDIAN
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# define __HUGE_VALF_bytes { 0x7f, 0x80, 0, 0 }
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# endif
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# if __BYTE_ORDER == __LITTLE_ENDIAN
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# define __HUGE_VALF_bytes { 0, 0, 0x80, 0x7f }
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# endif
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static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes };
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# define HUGE_VALF (__huge_valf.__f)
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#endif /* GCC. */
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@ -1,41 +0,0 @@
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/* `HUGE_VALL' constant for m68k (where it is infinity).
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Used by <stdlib.h> and <math.h> functions for overflow.
|
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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/>. */
|
||||
|
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#ifndef _MATH_H
|
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# error "Never use <bits/huge_val.h> directly; include <math.h> instead."
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#endif
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#if __GNUC_PREREQ(3,3)
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# define HUGE_VALL (__builtin_huge_vall ())
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#elif __GNUC_PREREQ(2,96)
|
||||
# define HUGE_VALL (__extension__ 0x1.0p32767L)
|
||||
#elif defined __GNUC__
|
||||
|
||||
# define HUGE_VALL \
|
||||
(__extension__ \
|
||||
((union { unsigned long __l[3]; long double __ld; }) \
|
||||
{ __l: { 0x7fff0000UL, 0x80000000UL, 0UL } }).__ld)
|
||||
|
||||
#else /* not GCC */
|
||||
|
||||
static union { unsigned char __c[12]; long double __ld; } __huge_vall =
|
||||
{ { 0x7f, 0xff, 0, 0, 0x80, 0, 0, 0, 0, 0, 0, 0 } };
|
||||
# define HUGE_VALL (__huge_vall.__ld)
|
||||
|
||||
#endif /* GCC 2.95. */
|
||||
@ -1,54 +0,0 @@
|
||||
/* `HUGE_VAL' constants for IEEE 754 machines (where it is infinity).
|
||||
Used by <stdlib.h> and <math.h> functions for overflow.
|
||||
SH 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/huge_val.h> directly; include <math.h> instead."
|
||||
#endif
|
||||
|
||||
/* IEEE positive infinity (-HUGE_VAL is negative infinity). */
|
||||
|
||||
#if __GNUC_PREREQ(3,3)
|
||||
# define HUGE_VAL (__builtin_huge_val())
|
||||
#elif __GNUC_PREREQ(2,96)
|
||||
# define HUGE_VAL (__extension__ 0x1.0p2047)
|
||||
#elif defined __GNUC__
|
||||
|
||||
# define HUGE_VAL \
|
||||
(__extension__ \
|
||||
((union { unsigned __l __attribute__((__mode__(__DI__))); double __d; }) \
|
||||
{ __l: 0x000000007ff00000ULL }).__d)
|
||||
|
||||
#else /* not GCC */
|
||||
|
||||
# include <endian.h>
|
||||
|
||||
typedef union { unsigned char __c[8]; double __d; } __huge_val_t;
|
||||
|
||||
# if __BYTE_ORDER == __BIG_ENDIAN
|
||||
# define __HUGE_VAL_bytes { 0, 0, 0, 0, 0x7f, 0xf0, 0, 0 }
|
||||
# endif
|
||||
# if __BYTE_ORDER == __LITTLE_ENDIAN
|
||||
# define __HUGE_VAL_bytes { 0, 0, 0xf0, 0x7f, 0, 0, 0, 0 }
|
||||
# endif
|
||||
|
||||
static __huge_val_t __huge_val = { __HUGE_VAL_bytes };
|
||||
# define HUGE_VAL (__huge_val.__d)
|
||||
|
||||
#endif /* GCC. */
|
||||
@ -1,47 +0,0 @@
|
||||
/* `HUGE_VALL' constant for IEEE 754 machines (where it is infinity).
|
||||
Used by <stdlib.h> and <math.h> functions for overflow.
|
||||
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/huge_vall.h> directly; include <math.h> instead."
|
||||
#endif
|
||||
|
||||
#if __GNUC_PREREQ(3,3)
|
||||
# define HUGE_VALL (__builtin_huge_vall())
|
||||
#else
|
||||
# include <bits/wordsize.h>
|
||||
# if __WORDSIZE == 32
|
||||
# define HUGE_VALL ((long double) HUGE_VAL)
|
||||
# elif __GNUC_PREREQ(2,96)
|
||||
# define HUGE_VALL (__extension__ 0x1.0p32767L)
|
||||
# elif defined __GNUC__
|
||||
|
||||
# define HUGE_VALL \
|
||||
(__extension__ \
|
||||
((union { struct { unsigned long __h, __l; } __i; long double __d; }) \
|
||||
{ __i: { __h: 0x7fff000000000000UL, __l: 0 } }).__d)
|
||||
|
||||
# else /* not GCC */
|
||||
|
||||
typedef union { unsigned char __c[16]; long double __d; } __huge_vall_t;
|
||||
# define __HUGE_VALL_bytes { 0x7f, 0xff, 0,0,0,0,0,0,0,0,0,0,0,0,0,0 }
|
||||
static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes };
|
||||
# define HUGE_VALL (__huge_vall.__d)
|
||||
|
||||
# endif /* GCC. */
|
||||
#endif /* GCC 3.3. */
|
||||
@ -1,41 +0,0 @@
|
||||
/* `HUGE_VALL' constant for ix86 (where it is infinity).
|
||||
Used by <stdlib.h> and <math.h> functions for overflow.
|
||||
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/huge_vall.h> directly; include <math.h> instead."
|
||||
#endif
|
||||
|
||||
#if __GNUC_PREREQ(3,3)
|
||||
# define HUGE_VALL (__builtin_huge_vall())
|
||||
#elif __GNUC_PREREQ(2,96)
|
||||
# define HUGE_VALL (__extension__ 0x1.0p32767L)
|
||||
#else
|
||||
|
||||
# define __HUGE_VALL_bytes { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0x7f, 0, 0 }
|
||||
|
||||
# define __huge_vall_t union { unsigned char __c[12]; long double __ld; }
|
||||
# ifdef __GNUC__
|
||||
# define HUGE_VALL (__extension__ \
|
||||
((__huge_vall_t) { __c: __HUGE_VALL_bytes }).__ld)
|
||||
# else /* Not GCC. */
|
||||
static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes };
|
||||
# define HUGE_VALL (__huge_vall.__ld)
|
||||
# endif /* GCC. */
|
||||
|
||||
#endif /* GCC 2.95 */
|
||||
Loading…
Reference in New Issue
Block a user