Refactor float_t, double_t information into bits/flt-eval-method.h.
At present, definitions of float_t and double_t are split among many bits/mathdef.h headers. For all but three architectures, these types are float and double. Furthermore, if you assume __FLT_EVAL_METHOD__ to be defined, that provides a more generic way of determining the correct values of these typedefs. Defining these typedefs more generally based on __FLT_EVAL_METHOD__ was previously proposed by Paul Eggert in <https://sourceware.org/ml/libc-alpha/2012-02/msg00002.html>. This patch refactors things in the way I proposed in <https://sourceware.org/ml/libc-alpha/2016-11/msg00745.html>. A new header bits/flt-eval-method.h defines a single macro, __GLIBC_FLT_EVAL_METHOD, which is then used by math.h to define float_t and double_t. The default is based on __FLT_EVAL_METHOD__ (although actually a default to 0 would have the same effect for current ports, because ports where values other than 0 or 16 are possible all have their own headers). To avoid changing the existing semantics in any case, including for compilers not defining __FLT_EVAL_METHOD__, architecture-specific files are then added for m68k, s390, x86 which replicate the existing semantics. At least with __FLT_EVAL_METHOD__ values possible with GCC, there should be no change to the choices of float_t and double_t for any supported configuration. Architecture maintainer notes: * m68k: sysdeps/m68k/m680x0/bits/flt-eval-method.h always defines __GLIBC_FLT_EVAL_METHOD to 2 to replicate the existing logic. But actually GCC defines __FLT_EVAL_METHOD__ to 0 if TARGET_68040. It might make sense to make the header prefer to base things on __FLT_EVAL_METHOD__ if defined, like the x86 version, and so make the choices of these types more accurate (with a NEWS entry as for the other changes to these types on particular architectures). * s390: sysdeps/s390/bits/flt-eval-method.h always defines __GLIBC_FLT_EVAL_METHOD to 1 to replicate the existing logic. As previously discussed, it might make sense in coordination with GCC to eliminate the historic mistake, avoid excess precision in the -fexcess-precision=standard case and make the typedefs match (with a NEWS entry, again). Tested for x86-64 and x86. Also did compilation-only testing with build-many-glibcs.py. * bits/flt-eval-method.h: New file. * sysdeps/m68k/m680x0/bits/flt-eval-method.h: Likewise. * sysdeps/s390/bits/flt-eval-method.h: Likewise. * sysdeps/x86/bits/flt-eval-method.h: Likewise. * math/Makefile (headers): Add bits/flt-eval-method.h. * math/math.h: Include <bits/flt-eval-method.h>. [__USE_ISOC99] (float_t): Define based on __GLIBC_FLT_EVAL_METHOD. [__USE_ISOC99] (double_t): Likewise. * bits/mathdef.h (float_t): Remove. (double_t): Likewise. * sysdeps/aarch64/bits/mathdef.h (float_t): Likewise. (double_t): Likewise. * sysdeps/alpha/bits/mathdef.h (float_t): Likewise. (double_t): Likewise. * sysdeps/arm/bits/mathdef.h (float_t): Likewise. (double_t): Likewise. * sysdeps/hppa/fpu/bits/mathdef.h (float_t): Likewise. (double_t): Likewise. * sysdeps/ia64/bits/mathdef.h (float_t): Likewise. (double_t): Likewise. * sysdeps/m68k/m680x0/bits/mathdef.h (float_t): Likewise. (double_t): Likewise. * sysdeps/mips/bits/mathdef.h (float_t): Likewise. (double_t): Likewise. * sysdeps/powerpc/bits/mathdef.h (float_t): Likewise. (double_t): Likewise. * sysdeps/s390/bits/mathdef.h (float_t): Likewise. (double_t): Likewise. * sysdeps/sh/sh4/bits/mathdef.h (float_t): Likewise. (double_t): Likewise. * sysdeps/sparc/bits/mathdef.h (float_t): Likewise. (double_t): Likewise. * sysdeps/tile/bits/mathdef.h (float_t): Likewise. (double_t): Likewise. * sysdeps/x86/bits/mathdef.h (float_t): Likewise. (double_t): Likewise.
This commit is contained in:
Joseph Myers
parent
380ec16d62
commit
93eb85ceb2
39
ChangeLog
39
ChangeLog
|
|
@ -1,3 +1,42 @@
|
|||
2016-11-24 Joseph Myers <joseph@codesourcery.com>
|
||||
|
||||
* bits/flt-eval-method.h: New file.
|
||||
* sysdeps/m68k/m680x0/bits/flt-eval-method.h: Likewise.
|
||||
* sysdeps/s390/bits/flt-eval-method.h: Likewise.
|
||||
* sysdeps/x86/bits/flt-eval-method.h: Likewise.
|
||||
* math/Makefile (headers): Add bits/flt-eval-method.h.
|
||||
* math/math.h: Include <bits/flt-eval-method.h>.
|
||||
[__USE_ISOC99] (float_t): Define based on __GLIBC_FLT_EVAL_METHOD.
|
||||
[__USE_ISOC99] (double_t): Likewise.
|
||||
* bits/mathdef.h (float_t): Remove.
|
||||
(double_t): Likewise.
|
||||
* sysdeps/aarch64/bits/mathdef.h (float_t): Likewise.
|
||||
(double_t): Likewise.
|
||||
* sysdeps/alpha/bits/mathdef.h (float_t): Likewise.
|
||||
(double_t): Likewise.
|
||||
* sysdeps/arm/bits/mathdef.h (float_t): Likewise.
|
||||
(double_t): Likewise.
|
||||
* sysdeps/hppa/fpu/bits/mathdef.h (float_t): Likewise.
|
||||
(double_t): Likewise.
|
||||
* sysdeps/ia64/bits/mathdef.h (float_t): Likewise.
|
||||
(double_t): Likewise.
|
||||
* sysdeps/m68k/m680x0/bits/mathdef.h (float_t): Likewise.
|
||||
(double_t): Likewise.
|
||||
* sysdeps/mips/bits/mathdef.h (float_t): Likewise.
|
||||
(double_t): Likewise.
|
||||
* sysdeps/powerpc/bits/mathdef.h (float_t): Likewise.
|
||||
(double_t): Likewise.
|
||||
* sysdeps/s390/bits/mathdef.h (float_t): Likewise.
|
||||
(double_t): Likewise.
|
||||
* sysdeps/sh/sh4/bits/mathdef.h (float_t): Likewise.
|
||||
(double_t): Likewise.
|
||||
* sysdeps/sparc/bits/mathdef.h (float_t): Likewise.
|
||||
(double_t): Likewise.
|
||||
* sysdeps/tile/bits/mathdef.h (float_t): Likewise.
|
||||
(double_t): Likewise.
|
||||
* sysdeps/x86/bits/mathdef.h (float_t): Likewise.
|
||||
(double_t): Likewise.
|
||||
|
||||
2016-11-24 Aurelien Jarno <aurelien@aurel32.net>
|
||||
|
||||
* sysdeps/x86_64/memcpy_chk.S (__memcpy_chk): Check for SHARED
|
||||
|
|
|
|||
|
|
@ -0,0 +1,42 @@
|
|||
/* Define __GLIBC_FLT_EVAL_METHOD.
|
||||
Copyright (C) 2016 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/flt-eval-method.h> directly; include <math.h> instead."
|
||||
#endif
|
||||
|
||||
/* __GLIBC_FLT_EVAL_METHOD is the value of FLT_EVAL_METHOD used to
|
||||
determine the evaluation method typedefs such as float_t and
|
||||
double_t. It must be a value from C11 or TS 18661-3:2015, and not
|
||||
-1. */
|
||||
|
||||
/* In the default version of this header, follow __FLT_EVAL_METHOD__.
|
||||
-1 is mapped to 2 (considering evaluation as long double to be a
|
||||
conservatively safe assumption), and if __FLT_EVAL_METHOD__ is not
|
||||
defined then assume there is no excess precision and use the value
|
||||
0. */
|
||||
|
||||
#ifdef __FLT_EVAL_METHOD__
|
||||
# if __FLT_EVAL_METHOD__ == -1
|
||||
# define __GLIBC_FLT_EVAL_METHOD 2
|
||||
# else
|
||||
# define __GLIBC_FLT_EVAL_METHOD __FLT_EVAL_METHOD__
|
||||
# endif
|
||||
#else
|
||||
# define __GLIBC_FLT_EVAL_METHOD 0
|
||||
#endif
|
||||
|
|
@ -22,13 +22,6 @@
|
|||
#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
|
||||
# define _MATH_H_MATHDEF 1
|
||||
|
||||
/* Expressions are evaluated with the range and precision of their
|
||||
type. */
|
||||
typedef float float_t; /* `float' expressions are evaluated as
|
||||
`float'. */
|
||||
typedef double double_t; /* `double' expressions are evaluated as
|
||||
`double'. */
|
||||
|
||||
/* The values returned by `ilogb' for 0 and NaN respectively. */
|
||||
# define FP_ILOGB0 (-2147483647)
|
||||
# define FP_ILOGBNAN 2147483647
|
||||
|
|
|
|||
|
|
@ -27,7 +27,8 @@ headers := math.h bits/mathcalls.h bits/mathinline.h bits/huge_val.h \
|
|||
fpu_control.h complex.h bits/cmathcalls.h fenv.h \
|
||||
bits/fenv.h bits/fenvinline.h bits/mathdef.h tgmath.h \
|
||||
bits/math-finite.h bits/math-vector.h \
|
||||
bits/libm-simd-decl-stubs.h bits/iscanonical.h
|
||||
bits/libm-simd-decl-stubs.h bits/iscanonical.h \
|
||||
bits/flt-eval-method.h
|
||||
|
||||
# FPU support code.
|
||||
aux := setfpucw fpu_control
|
||||
|
|
|
|||
42
math/math.h
42
math/math.h
|
|
@ -54,13 +54,51 @@ __BEGIN_DECLS
|
|||
# endif
|
||||
#endif
|
||||
|
||||
/* Get the architecture specific values describing the floating-point
|
||||
evaluation. The following symbols will get defined:
|
||||
/* Get __GLIBC_FLT_EVAL_METHOD. */
|
||||
#include <bits/flt-eval-method.h>
|
||||
|
||||
#ifdef __USE_ISOC99
|
||||
/* Define the following typedefs.
|
||||
|
||||
float_t floating-point type at least as wide as `float' used
|
||||
to evaluate `float' expressions
|
||||
double_t floating-point type at least as wide as `double' used
|
||||
to evaluate `double' expressions
|
||||
*/
|
||||
# if __GLIBC_FLT_EVAL_METHOD == 0 || __GLIBC_FLT_EVAL_METHOD == 16
|
||||
typedef float float_t;
|
||||
typedef double double_t;
|
||||
# elif __GLIBC_FLT_EVAL_METHOD == 1
|
||||
typedef double float_t;
|
||||
typedef double double_t;
|
||||
# elif __GLIBC_FLT_EVAL_METHOD == 2
|
||||
typedef long double float_t;
|
||||
typedef long double double_t;
|
||||
# elif __GLIBC_FLT_EVAL_METHOD == 32
|
||||
typedef _Float32 float_t;
|
||||
typedef double double_t;
|
||||
# elif __GLIBC_FLT_EVAL_METHOD == 33
|
||||
typedef _Float32x float_t;
|
||||
typedef _Float32x double_t;
|
||||
# elif __GLIBC_FLT_EVAL_METHOD == 64
|
||||
typedef _Float64 float_t;
|
||||
typedef _Float64 double_t;
|
||||
# elif __GLIBC_FLT_EVAL_METHOD == 65
|
||||
typedef _Float64x float_t;
|
||||
typedef _Float64x double_t;
|
||||
# elif __GLIBC_FLT_EVAL_METHOD == 128
|
||||
typedef _Float128 float_t;
|
||||
typedef _Float128 double_t;
|
||||
# elif __GLIBC_FLT_EVAL_METHOD == 129
|
||||
typedef _Float128x float_t;
|
||||
typedef _Float128x double_t;
|
||||
# else
|
||||
# error "Unknown __GLIBC_FLT_EVAL_METHOD"
|
||||
# endif
|
||||
#endif
|
||||
|
||||
/* Get the architecture specific values describing the floating-point
|
||||
evaluation. The following symbols will get defined:
|
||||
|
||||
FP_FAST_FMA
|
||||
FP_FAST_FMAF
|
||||
|
|
|
|||
|
|
@ -23,12 +23,6 @@
|
|||
#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
|
||||
# define _MATH_H_MATHDEF 1
|
||||
|
||||
/* GCC does not promote `float' values to `double'. */
|
||||
typedef float float_t; /* `float' expressions are evaluated as
|
||||
`float'. */
|
||||
typedef double double_t; /* `double' expressions are evaluated as
|
||||
`double'. */
|
||||
|
||||
/* The values returned by `ilogb' for 0 and NaN respectively. */
|
||||
# define FP_ILOGB0 (-2147483647)
|
||||
# define FP_ILOGBNAN (2147483647)
|
||||
|
|
|
|||
|
|
@ -25,10 +25,6 @@
|
|||
#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
|
||||
# define _MATH_H_MATHDEF 1
|
||||
|
||||
/* Alpha has "float" and "double" operations. */
|
||||
typedef float float_t; /* float expressions are evaluated as float. */
|
||||
typedef double double_t; /* double expressions are evaluated as double. */
|
||||
|
||||
/* The values returned by `ilogb' for 0 and NaN respectively. */
|
||||
# define FP_ILOGB0 (-2147483647)
|
||||
# define FP_ILOGBNAN (2147483647)
|
||||
|
|
|
|||
|
|
@ -22,12 +22,6 @@
|
|||
#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
|
||||
# define _MATH_H_MATHDEF 1
|
||||
|
||||
/* GCC does not promote `float' values to `double'. */
|
||||
typedef float float_t; /* `float' expressions are evaluated as
|
||||
`float'. */
|
||||
typedef double double_t; /* `double' expressions are evaluated as
|
||||
`double'. */
|
||||
|
||||
/* The values returned by `ilogb' for 0 and NaN respectively. */
|
||||
# define FP_ILOGB0 (-2147483647)
|
||||
# define FP_ILOGBNAN (2147483647)
|
||||
|
|
|
|||
|
|
@ -22,12 +22,6 @@
|
|||
#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
|
||||
# define _MATH_H_MATHDEF 1
|
||||
|
||||
/* GCC does not promote `float' values to `double'. */
|
||||
typedef float float_t; /* `float' expressions are evaluated as
|
||||
`float'. */
|
||||
typedef double double_t; /* `double' expressions are evaluated as
|
||||
`double'. */
|
||||
|
||||
/* The values returned by `ilogb' for 0 and NaN respectively. */
|
||||
# define FP_ILOGB0 (-2147483647)
|
||||
# define FP_ILOGBNAN (2147483647)
|
||||
|
|
|
|||
|
|
@ -22,13 +22,6 @@
|
|||
#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
|
||||
# define _MATH_H_MATHDEF 1
|
||||
|
||||
/* The IA-64 architecture computes values with the precision of the
|
||||
used type. */
|
||||
typedef float float_t; /* `float' expressions are evaluated as
|
||||
`float'. */
|
||||
typedef double double_t; /* `double' expressions are evaluated as
|
||||
`double'. */
|
||||
|
||||
/* The values returned by `ilogb' for 0 and NaN respectively. */
|
||||
# define FP_ILOGB0 (-2147483647 - 1)
|
||||
# define FP_ILOGBNAN 2147483647
|
||||
|
|
|
|||
|
|
@ -0,0 +1,25 @@
|
|||
/* Define __GLIBC_FLT_EVAL_METHOD. M68K version.
|
||||
Copyright (C) 2016 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/flt-eval-method.h> directly; include <math.h> instead."
|
||||
#endif
|
||||
|
||||
/* The m68k FPUs evaluate all values in the 96-bit floating-point
|
||||
format which is also available for the user as 'long double'. */
|
||||
#define __GLIBC_FLT_EVAL_METHOD 2
|
||||
|
|
@ -22,14 +22,6 @@
|
|||
#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
|
||||
# define _MATH_H_MATHDEF 1
|
||||
|
||||
/* The m68k FPUs evaluate all values in the 96 bit floating-point format
|
||||
which is also available for the user as `long double'. Therefore we
|
||||
define: */
|
||||
typedef long double float_t; /* `float' expressions are evaluated as
|
||||
`long double'. */
|
||||
typedef long double double_t; /* `double' expressions are evaluated as
|
||||
`long double'. */
|
||||
|
||||
/* The values returned by `ilogb' for 0 and NaN respectively. */
|
||||
# define FP_ILOGB0 (-2147483647 - 1)
|
||||
# define FP_ILOGBNAN (2147483647)
|
||||
|
|
|
|||
|
|
@ -24,12 +24,6 @@
|
|||
#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
|
||||
# define _MATH_H_MATHDEF 1
|
||||
|
||||
/* MIPS has `float' and `double' operations. */
|
||||
typedef float float_t; /* `float' expressions are evaluated as
|
||||
`float'. */
|
||||
typedef double double_t; /* `double' expressions are evaluated as
|
||||
`double'. */
|
||||
|
||||
/* The values returned by `ilogb' for 0 and NaN respectively. */
|
||||
# define FP_ILOGB0 (-2147483647)
|
||||
# define FP_ILOGBNAN 2147483647
|
||||
|
|
|
|||
|
|
@ -29,10 +29,6 @@
|
|||
#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
|
||||
# define _MATH_H_MATHDEF 1
|
||||
|
||||
/* PowerPC has both `float' and `double' arithmetic. */
|
||||
typedef float float_t;
|
||||
typedef double double_t;
|
||||
|
||||
/* The values returned by `ilogb' for 0 and NaN respectively. */
|
||||
# define FP_ILOGB0 (-2147483647)
|
||||
# define FP_ILOGBNAN (2147483647)
|
||||
|
|
|
|||
|
|
@ -0,0 +1,24 @@
|
|||
/* Define __GLIBC_FLT_EVAL_METHOD. S/390 version.
|
||||
Copyright (C) 2016 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/flt-eval-method.h> directly; include <math.h> instead."
|
||||
#endif
|
||||
|
||||
/* This value is used because of a historical mistake. */
|
||||
#define __GLIBC_FLT_EVAL_METHOD 1
|
||||
|
|
@ -22,13 +22,6 @@
|
|||
#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
|
||||
# define _MATH_H_MATHDEF 1
|
||||
|
||||
/* Normally, there is no long double type and the `float' and `double'
|
||||
expressions are evaluated as `double'. */
|
||||
typedef double float_t; /* `float' expressions are evaluated as
|
||||
`double'. */
|
||||
typedef double double_t; /* `double' expressions are evaluated as
|
||||
`double'. */
|
||||
|
||||
/* The values returned by `ilogb' for 0 and NaN respectively. */
|
||||
# define FP_ILOGB0 (-2147483647)
|
||||
# define FP_ILOGBNAN 2147483647
|
||||
|
|
|
|||
|
|
@ -29,10 +29,6 @@
|
|||
#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
|
||||
# define _MATH_H_MATHDEF 1
|
||||
|
||||
/* SH has both `float' and `double' arithmetic. */
|
||||
typedef float float_t;
|
||||
typedef double double_t;
|
||||
|
||||
/* The values returned by `ilogb' for 0 and NaN respectively. */
|
||||
# define FP_ILOGB0 (-0x7fffffff)
|
||||
# define FP_ILOGBNAN 0x7fffffff
|
||||
|
|
|
|||
|
|
@ -27,10 +27,6 @@
|
|||
#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
|
||||
# define _MATH_H_MATHDEF 1
|
||||
|
||||
/* SPARC has both `float' and `double' arithmetic. */
|
||||
typedef float float_t;
|
||||
typedef double double_t;
|
||||
|
||||
/* The values returned by `ilogb' for 0 and NaN respectively. */
|
||||
# define FP_ILOGB0 (-2147483647)
|
||||
# define FP_ILOGBNAN (2147483647)
|
||||
|
|
|
|||
|
|
@ -23,10 +23,6 @@
|
|||
#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
|
||||
# define _MATH_H_MATHDEF 1
|
||||
|
||||
/* "float" and "double" expressions evaluated as "float" and "double". */
|
||||
typedef float float_t;
|
||||
typedef double double_t;
|
||||
|
||||
/* The values returned by `ilogb' for 0 and NaN respectively. */
|
||||
# define FP_ILOGB0 (-2147483647)
|
||||
# define FP_ILOGBNAN (2147483647)
|
||||
|
|
|
|||
|
|
@ -0,0 +1,33 @@
|
|||
/* Define __GLIBC_FLT_EVAL_METHOD. x86 version.
|
||||
Copyright (C) 2016 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/flt-eval-method.h> directly; include <math.h> instead."
|
||||
#endif
|
||||
|
||||
#ifdef __FLT_EVAL_METHOD__
|
||||
# if __FLT_EVAL_METHOD__ == -1
|
||||
# define __GLIBC_FLT_EVAL_METHOD 2
|
||||
# else
|
||||
# define __GLIBC_FLT_EVAL_METHOD __FLT_EVAL_METHOD__
|
||||
# endif
|
||||
#elif defined __x86_64__
|
||||
# define __GLIBC_FLT_EVAL_METHOD 0
|
||||
#else
|
||||
# define __GLIBC_FLT_EVAL_METHOD 2
|
||||
#endif
|
||||
|
|
@ -22,23 +22,6 @@
|
|||
#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
|
||||
# define _MATH_H_MATHDEF 1
|
||||
|
||||
# if ((defined __x86_64__ && !defined __FLT_EVAL_METHOD__) \
|
||||
|| (defined __FLT_EVAL_METHOD__ && __FLT_EVAL_METHOD__ == 0))
|
||||
/* The x86-64 architecture computes values with the precission of the
|
||||
used type. Similarly for -m32 -mfpmath=sse. */
|
||||
typedef float float_t; /* `float' expressions are evaluated as `float'. */
|
||||
typedef double double_t; /* `double' expressions are evaluated
|
||||
as `double'. */
|
||||
# else
|
||||
/* The ix87 FPUs evaluate all values in the 80 bit floating-point format
|
||||
which is also available for the user as `long double'. Therefore we
|
||||
define: */
|
||||
typedef long double float_t; /* `float' expressions are evaluated as
|
||||
`long double'. */
|
||||
typedef long double double_t; /* `double' expressions are evaluated as
|
||||
`long double'. */
|
||||
# endif
|
||||
|
||||
/* The values returned by `ilogb' for 0 and NaN respectively. */
|
||||
# define FP_ILOGB0 (-2147483647 - 1)
|
||||
# define FP_ILOGBNAN (-2147483647 - 1)
|
||||
|
|
|
|||
Loading…
Reference in New Issue