From 2c9e80e7d44afd1daec7c7d7760ebbf3bed18cd6 Mon Sep 17 00:00:00 2001
From: Joseph Myers <joseph@codesourcery.com>
Date: Wed, 7 Sep 2016 16:43:03 +0000
Subject: Add femode_t functions: arm.

This patch adds ARM versions of fegetmode and fesetmode.

	* sysdeps/arm/fegetmode.c: New file.
	* sysdeps/arm/fesetmode.c: Likewise.
---
 sysdeps/arm/fesetmode.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 sysdeps/arm/fesetmode.c

(limited to 'sysdeps/arm/fesetmode.c')

diff --git a/sysdeps/arm/fesetmode.c b/sysdeps/arm/fesetmode.c
new file mode 100644
index 0000000000..e96c845841
--- /dev/null
+++ b/sysdeps/arm/fesetmode.c
@@ -0,0 +1,45 @@
+/* Install given floating-point control modes.  ARM 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.h>
+#include <fpu_control.h>
+#include <arm-features.h>
+
+/* NZCV flags, QC bit, IDC bit and bits for IEEE exception status.  */
+#define FPU_STATUS_BITS 0xf800009f
+
+int
+fesetmode (const femode_t *modep)
+{
+  fpu_control_t fpscr, new_fpscr;
+
+  if (!ARM_HAVE_VFP)
+    /* Nothing to do.  */
+    return 0;
+
+  _FPU_GETCW (fpscr);
+  if (modep == FE_DFL_MODE)
+    new_fpscr = (fpscr & (_FPU_RESERVED | FPU_STATUS_BITS)) | _FPU_DEFAULT;
+  else
+    new_fpscr = (fpscr & FPU_STATUS_BITS) | (*modep & ~FPU_STATUS_BITS);
+
+  if (((new_fpscr ^ fpscr) & ~_FPU_MASK_NZCV) != 0)
+    _FPU_SETCW (new_fpscr);
+
+  return 0;
+}
-- 
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