Add femode_t functions: alpha.

This patch adds Alpha versions of fegetmode and fesetmode.  Untested.

	* sysdeps/alpha/fpu/fegetmode.c: New file.
	* sysdeps/alpha/fpu/fesetmode.c: Likewise.

3 files changed, 80 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 0261fbd..26b324b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2016-09-07  Joseph Myers  <joseph@codesourcery.com>
 
+	* sysdeps/alpha/fpu/fegetmode.c: New file.
+	* sysdeps/alpha/fpu/fesetmode.c: Likewise.
+
 	* sysdeps/aarch64/fpu/fegetmode.c: New file.
 	* sysdeps/aarch64/fpu/fesetmode.c: Likewise.
 
diff --git a/sysdeps/alpha/fpu/fegetmode.c b/sysdeps/alpha/fpu/fegetmode.c
new file mode 100644
index 0000000..f3a6ede
--- /dev/null
+++ b/sysdeps/alpha/fpu/fegetmode.c
@@ -0,0 +1,33 @@
+/* Store current floating-point control modes.  Alpha version.
+   Copyright (C) 2016 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/>.  */
+
+#include <fenv_libc.h>
+
+int
+fegetmode (femode_t *modep)
+{
+  unsigned long int fpcr;
+  unsigned long int swcr;
+
+  /* As in fegetenv.  */
+  swcr = __ieee_get_fp_control ();
+  __asm__ __volatile__ ("mf_fpcr %0" : "=f" (fpcr));
+  *modep = ((fpcr & FPCR_ROUND_MASK) | (swcr & SWCR_ALL_MASK));
+
+  return 0;
+}
diff --git a/sysdeps/alpha/fpu/fesetmode.c b/sysdeps/alpha/fpu/fesetmode.c
new file mode 100644
index 0000000..d4662e1
--- /dev/null
+++ b/sysdeps/alpha/fpu/fesetmode.c
@@ -0,0 +1,44 @@
+/* Install given floating-point control modes.  Alpha version.
+   Copyright (C) 2016 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/>.  */
+
+#include <fenv_libc.h>
+
+int
+fesetmode (const femode_t *modep)
+{
+  unsigned long int fpcr;
+  unsigned long int swcr;
+  femode_t mode;
+
+  /* As in fesetenv.  */
+  if ((long int) modep >= 0)
+    mode = *modep;
+  else
+    mode = (unsigned long int) modep;
+
+  __asm__ __volatile__ ("excb; mf_fpcr %0" : "=f" (fpcr));
+  fpcr = (fpcr & ~FPCR_ROUND_MASK) | (mode & FPCR_ROUND_MASK);
+  __asm__ __volatile__ ("mt_fpcr %0" : : "f" (fpcr));
+
+  swcr = __ieee_get_fp_control ();
+  swcr = ((mode & SWCR_ALL_MASK & ~SWCR_STATUS_MASK)
+	  | (swcr & SWCR_STATUS_MASK));
+  __ieee_set_fp_control (swcr);
+
+  return 0;
+}