- add C99 floating point environment, rounding and exception handling functions

  for i386. UCLIBC_HAS_FENV

1 files changed, 40 insertions, 0 deletions

diff --git a/libm/i386/ftestexcept.c b/libm/i386/ftestexcept.c
new file mode 100644
index 000000000..ad6bf8954
--- /dev/null
+++ b/libm/i386/ftestexcept.c
@@ -0,0 +1,40 @@
+/* Test exception in current environment.
+   Copyright (C) 1997, 2003, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <fenv.h>
+#include <unistd.h>
+
+int
+fetestexcept (int excepts)
+{
+  int temp;
+  int xtemp = 0;
+
+  /* Get current exceptions.  */
+  __asm__ ("fnstsw %0" : "=a" (temp));
+
+#if 0
+  /* If the CPU supports SSE we test the MXCSR as well.  */
+  if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
+    __asm__ ("stmxcsr %0" : "=m" (*&xtemp));
+#endif
+
+  return (temp | xtemp) & excepts & FE_ALL_EXCEPT;
+}