| /* Copyright (C) 1997-2014 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 _FENV_H |
| # error "Never use <bits/fenv.h> directly; include <fenv.h> instead." |
| #endif |
| |
| /* Define bits representing the exception. We use the bit positions |
| of the appropriate bits in the FPU control word. */ |
| enum |
| { |
| FE_INVALID = |
| #define FE_INVALID 0x01 |
| FE_INVALID, |
| __FE_DENORM = 0x02, |
| FE_DIVBYZERO = |
| #define FE_DIVBYZERO 0x04 |
| FE_DIVBYZERO, |
| FE_OVERFLOW = |
| #define FE_OVERFLOW 0x08 |
| FE_OVERFLOW, |
| FE_UNDERFLOW = |
| #define FE_UNDERFLOW 0x10 |
| FE_UNDERFLOW, |
| FE_INEXACT = |
| #define FE_INEXACT 0x20 |
| FE_INEXACT |
| }; |
| |
| #define FE_ALL_EXCEPT \ |
| (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) |
| |
| /* The ix87 FPU supports all of the four defined rounding modes. We |
| use again the bit positions in the FPU control word as the values |
| for the appropriate macros. */ |
| enum |
| { |
| FE_TONEAREST = |
| #define FE_TONEAREST 0 |
| FE_TONEAREST, |
| FE_DOWNWARD = |
| #define FE_DOWNWARD 0x400 |
| FE_DOWNWARD, |
| FE_UPWARD = |
| #define FE_UPWARD 0x800 |
| FE_UPWARD, |
| FE_TOWARDZERO = |
| #define FE_TOWARDZERO 0xc00 |
| FE_TOWARDZERO |
| }; |
| |
| |
| /* Type representing exception flags. */ |
| typedef unsigned short int fexcept_t; |
| |
| |
| /* Type representing floating-point environment. This structure |
| corresponds to the layout of the block written by the `fstenv' |
| instruction and has additional fields for the contents of the MXCSR |
| register as written by the `stmxcsr' instruction. */ |
| typedef struct |
| { |
| unsigned short int __control_word; |
| unsigned short int __glibc_reserved1; |
| unsigned short int __status_word; |
| unsigned short int __glibc_reserved2; |
| unsigned short int __tags; |
| unsigned short int __glibc_reserved3; |
| unsigned int __eip; |
| unsigned short int __cs_selector; |
| unsigned int __opcode:11; |
| unsigned int __glibc_reserved4:5; |
| unsigned int __data_offset; |
| unsigned short int __data_selector; |
| unsigned short int __glibc_reserved5; |
| #ifdef __x86_64__ |
| unsigned int __mxcsr; |
| #endif |
| } |
| fenv_t; |
| |
| /* If the default argument is used we use this value. */ |
| #define FE_DFL_ENV ((const fenv_t *) -1) |
| |
| #ifdef __USE_GNU |
| /* Floating-point environment where none of the exception is masked. */ |
| # define FE_NOMASK_ENV ((const fenv_t *) -2) |
| #endif |
| |
| |
| #ifdef __USE_EXTERN_INLINES |
| __BEGIN_DECLS |
| |
| /* Optimized versions. */ |
| extern int __REDIRECT_NTH (__feraiseexcept_renamed, (int), feraiseexcept); |
| __extern_inline int |
| __NTH (feraiseexcept (int __excepts)) |
| { |
| if (__builtin_constant_p (__excepts) |
| && (__excepts & ~(FE_INVALID | FE_DIVBYZERO)) == 0) |
| { |
| if ((FE_INVALID & __excepts) != 0) |
| { |
| /* One example of an invalid operation is 0.0 / 0.0. */ |
| float __f = 0.0; |
| |
| # ifdef __SSE_MATH__ |
| __asm__ __volatile__ ("divss %0, %0 " : : "x" (__f)); |
| # else |
| __asm__ __volatile__ ("fdiv %%st, %%st(0); fwait" |
| : "=t" (__f) : "0" (__f)); |
| # endif |
| (void) &__f; |
| } |
| if ((FE_DIVBYZERO & __excepts) != 0) |
| { |
| float __f = 1.0; |
| float __g = 0.0; |
| |
| # ifdef __SSE_MATH__ |
| __asm__ __volatile__ ("divss %1, %0" : : "x" (__f), "x" (__g)); |
| # else |
| __asm__ __volatile__ ("fdivp %%st, %%st(1); fwait" |
| : "=t" (__f) : "0" (__f), "u" (__g) : "st(1)"); |
| # endif |
| (void) &__f; |
| } |
| |
| return 0; |
| } |
| |
| return __feraiseexcept_renamed (__excepts); |
| } |
| |
| __END_DECLS |
| #endif |