| 1 | /* Store current floating-point environment and clear exceptions. |
|---|
| 2 | Copyright (C) 2001-2022 Free Software Foundation, Inc. |
|---|
| 3 | This file is part of the GNU C Library. |
|---|
| 4 | |
|---|
| 5 | The GNU C Library is free software; you can redistribute it and/or |
|---|
| 6 | modify it under the terms of the GNU Lesser General Public |
|---|
| 7 | License as published by the Free Software Foundation; either |
|---|
| 8 | version 2.1 of the License, or (at your option) any later version. |
|---|
| 9 | |
|---|
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
|---|
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|---|
| 13 | Lesser General Public License for more details. |
|---|
| 14 | |
|---|
| 15 | You should have received a copy of the GNU Lesser General Public |
|---|
| 16 | License along with the GNU C Library; if not, see |
|---|
| 17 | <https://www.gnu.org/licenses/>. */ |
|---|
| 18 | |
|---|
| 19 | #include <fenv.h> |
|---|
| 20 | |
|---|
| 21 | int |
|---|
| 22 | __feholdexcept (fenv_t *envp) |
|---|
| 23 | { |
|---|
| 24 | unsigned int mxcsr; |
|---|
| 25 | |
|---|
| 26 | /* Store the environment. Recall that fnstenv has a side effect of |
|---|
| 27 | masking all exceptions. Then clear all exceptions. */ |
|---|
| 28 | __asm__ ("fnstenv %0\n\t" |
|---|
| 29 | "stmxcsr %1\n\t" |
|---|
| 30 | "fnclex" |
|---|
| 31 | : "=m" (*envp), "=m" (envp->__mxcsr)); |
|---|
| 32 | |
|---|
| 33 | /* Set the SSE MXCSR register. */ |
|---|
| 34 | mxcsr = (envp->__mxcsr | 0x1f80) & ~0x3f; |
|---|
| 35 | __asm__ ("ldmxcsr %0" : : "m" (*&mxcsr)); |
|---|
| 36 | |
|---|
| 37 | return 0; |
|---|
| 38 | } |
|---|
| 39 | libm_hidden_def (__feholdexcept) |
|---|
| 40 | weak_alias (__feholdexcept, feholdexcept) |
|---|
| 41 | libm_hidden_weak (feholdexcept) |
|---|
| 42 | |
|---|
