From edce88cfef2f2a62647c2ab9536ca29694fab292 Mon Sep 17 00:00:00 2001 From: Waldemar Brodkorb Date: Sun, 3 Dec 2017 21:12:34 +0100 Subject: x86_64: add fenv support from glibc --- libm/x86_64/feholdexcpt.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 libm/x86_64/feholdexcpt.c (limited to 'libm/x86_64/feholdexcpt.c') diff --git a/libm/x86_64/feholdexcpt.c b/libm/x86_64/feholdexcpt.c new file mode 100644 index 000000000..917e5f84b --- /dev/null +++ b/libm/x86_64/feholdexcpt.c @@ -0,0 +1,37 @@ +/* Store current floating-point environment and clear exceptions. + Copyright (C) 2001-2017 Free Software Foundation, Inc. + + 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 + . */ + +#include + +int +feholdexcept (fenv_t *envp) +{ + unsigned int mxcsr; + + /* Store the environment. Recall that fnstenv has a side effect of + masking all exceptions. Then clear all exceptions. */ + __asm__ ("fnstenv %0\n\t" + "stmxcsr %1\n\t" + "fnclex" + : "=m" (*envp), "=m" (envp->__mxcsr)); + + /* Set the SSE MXCSR register. */ + mxcsr = (envp->__mxcsr | 0x1f80) & ~0x3f; + __asm__ ("ldmxcsr %0" : : "m" (*&mxcsr)); + + return 0; +} -- cgit v1.2.3