alpha: Add get-rounding-mode.h

diff --git a/ports/ChangeLog.alpha b/ports/ChangeLog.alpha
index 9589dd3..fbe42ac 100644 (file)
--- a/ports/ChangeLog.alpha
+++ b/ports/ChangeLog.alpha
@@ -1,3 +1,7 @@
+2012-12-13  Richard Henderson  <rth@redhat.com>
+
+       * sysdeps/alpha/fpu/get-rounding-mode.h: New file.
+
 2012-08-30  Richard Henderson  <rth@redhat.com>
 
        * sysdeps/alpha/fpu/s_isnan.c: Define all aliases in terms of

diff --git a/ports/sysdeps/alpha/fpu/get-rounding-mode.h b/ports/sysdeps/alpha/fpu/get-rounding-mode.h
new file mode 100644 (file)
index 0000000..9d5b724
--- /dev/null
+++ b/ports/sysdeps/alpha/fpu/get-rounding-mode.h
@@ -0,0 +1,35 @@
+/* Determine floating-point rounding mode within libc.  Alpha version.
+   Copyright (C) 2012 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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/>.  */
+
+#ifndef ALPHA_GET_ROUNDING_MODE_H
+#define ALPHA_GET_ROUNDING_MODE_H      1
+
+#include <fenv.h>
+#include <fenv_libc.h>
+
+/* Return the floating-point rounding mode.  */
+
+static inline int
+get_rounding_mode (void)
+{
+  unsigned long fpcr;
+  __asm__ __volatile__("excb; mf_fpcr %0" : "=f"(fpcr));
+  return (fpcr >> FPCR_ROUND_SHIFT) & 3;
+}
+
+#endif /* get-rounding-mode.h */