projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 6d4752d8 | 1 | /* Install given floating-point environment and raise exceptions. |
| 568035b7 | 2 | Copyright (C) 1997-2013 Free Software Foundation, Inc. |
| 6d4752d8 | 3 | This file is part of the GNU C Library. |
| 7210de33 | 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. |
| 6d4752d8 UD |
5 | |
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
| 6d4752d8 UD |
10 | |
| 11 | The GNU C Library is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 14 | Lesser General Public License for more details. |
| 6d4752d8 | 15 | |
| 41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ | |
| 6d4752d8 | 19 | |
| 7210de33 | 20 | #include <fenv_libc.h> |
| edba7a54 | 21 | #include <fpu_control.h> |
| e279e90b | 22 | #include <bp-sym.h> |
| 6d4752d8 | 23 | |
| edba7a54 UD |
24 | #define _FPU_MASK_ALL (_FPU_MASK_ZM | _FPU_MASK_OM | _FPU_MASK_UM | _FPU_MASK_XM | _FPU_MASK_IM) |
| 25 | ||
| 63ae7b63 UD |
26 | int |
| 27 | __feupdateenv (const fenv_t *envp) | |
| 6d4752d8 | 28 | { |
| 7210de33 | 29 | fenv_union_t old, new; |
| 6d4752d8 | 30 | |
| 7210de33 UD |
31 | /* Save the currently set exceptions. */ |
| 32 | new.fenv = *envp; | |
| 33 | old.fenv = fegetenv_register (); | |
| 6d4752d8 | 34 | |
| 4a59e9ad UD |
35 | /* Restore rounding mode and exception enable from *envp and merge |
| 36 | exceptions. Leave fraction rounded/inexact and FP result/CC bits | |
| 37 | unchanged. */ | |
| 38 | new.l[1] = (old.l[1] & 0x1FFFFF00) | (new.l[1] & 0x1FF80FFF); | |
| 39 | ||
| 40 | /* If the old env has no eabled exceptions and the new env has any enabled | |
| 41 | exceptions, then unmask SIGFPE in the MSR FE0/FE1 bits. This will put | |
| 42 | the hardware into "precise mode" and may cause the FPU to run slower on | |
| 43 | some hardware. */ | |
| edba7a54 | 44 | if ((old.l[1] & _FPU_MASK_ALL) == 0 && (new.l[1] & _FPU_MASK_ALL) != 0) |
| 4a59e9ad UD |
45 | (void)__fe_nomask_env (); |
| 46 | ||
| 47 | /* If the old env had any eabled exceptions and the new env has no enabled | |
| 48 | exceptions, then mask SIGFPE in the MSR FE0/FE1 bits. This may allow the | |
| 49 | FPU to run faster because it always takes the default action and can not | |
| 50 | generate SIGFPE. */ | |
| edba7a54 | 51 | if ((old.l[1] & _FPU_MASK_ALL) != 0 && (new.l[1] & _FPU_MASK_ALL) == 0) |
| 4a59e9ad | 52 | (void)__fe_mask_env (); |
| 6d4752d8 | 53 | |
| 7210de33 UD |
54 | /* Atomically enable and raise (if appropriate) exceptions set in `new'. */ |
| 55 | fesetenv_register (new.fenv); | |
| 63ae7b63 UD |
56 | |
| 57 | /* Success. */ | |
| 58 | return 0; | |
| 6d4752d8 | 59 | } |
| 4eb8a862 RM |
60 | |
| 61 | #include <shlib-compat.h> | |
| 62 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) | |
| 63ae7b63 | 63 | strong_alias (__feupdateenv, __old_feupdateenv) |
| 4eb8a862 RM |
64 | compat_symbol (libm, BP_SYM (__old_feupdateenv), BP_SYM (feupdateenv), GLIBC_2_1); |
| 65 | #endif | |
| 66 | ||
| 9ff8d36f | 67 | libm_hidden_ver (__feupdateenv, feupdateenv) |
| 4eb8a862 | 68 | versioned_symbol (libm, BP_SYM (__feupdateenv), BP_SYM (feupdateenv), GLIBC_2_2); |