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diff --git a/libm/x86_64/ftestexcept.c b/libm/x86_64/ftestexcept.c
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+/* Test exception in current environment.
+ 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <fenv.h>
+
+int
+fetestexcept (int excepts)
+{
+ int temp;
+ unsigned int mxscr;
+
+ /* Get current exceptions. */
+ __asm__ ("fnstsw %0\n"
+ "stmxcsr %1" : "=m" (*&temp), "=m" (*&mxscr));
+
+ return (temp | mxscr) & excepts & FE_ALL_EXCEPT;
+}