1 files changed, 54 insertions, 0 deletions
diff --git a/hurd/bits/ia32/math.h b/hurd/bits/ia32/math.h
new file mode 100644
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+++ b/hurd/bits/ia32/math.h
@@ -0,0 +1,54 @@
+/* hurd/math.h - Public interface to Hurd mathematical support functions.
+   Copyright (C) 2003, 2004, 2007, 2008 Free Software Foundation, Inc.
+   Written by Marcus Brinkmann <marcus@gnu.org>.
+
+   This file is part of the GNU Hurd.
+ 
+   The GNU Hurd 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 Hurd 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 L4 library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.  */
+
+#ifndef _HURD_BITS_MATH_H
+#define _HURD_BITS_MATH_H
+
+#include <stdint.h>
+
+/* Calculate the MSB set in DATA.  DATA is not 0.  */
+static inline uintptr_t
+__VG_msb (uintptr_t data)
+{
+  uintptr_t msb;
+
+  __asm__ ("bsr %[data], %[msb]"
+	   : [msb] "=r" (msb)
+	   : [data] "rm" (data));
+
+  return msb + 1;
+}
+
+
+/* Calculate the LSB set in DATA.  DATA is not 0.  */
+static inline uintptr_t
+__VG_lsb (uintptr_t data)
+{
+  uintptr_t lsb;
+
+  __asm__ ("bsf %[data], %[lsb]"
+	   : [lsb] "=r" (lsb)
+	   : [data] "rm" (data));
+
+  return lsb + 1;
+}
+
+#endif