Licensing changes to GPLv3 resp. GPLv3 with GCC Runtime Exception.

[pf3gnuchains/gcc-fork.git] / libgfortran / intrinsics / ishftc.c

diff --git a/libgfortran/intrinsics/ishftc.c b/libgfortran/intrinsics/ishftc.c
index 2677c33..054c316 100644 (file)
--- a/libgfortran/intrinsics/ishftc.c
+++ b/libgfortran/intrinsics/ishftc.c
@@ -1,37 +1,37 @@
 /* Implementation of ishftc intrinsic.
-   Copyright 2002 Free Software Foundation, Inc.
+   Copyright 2002, 2004, 2009 Free Software Foundation, Inc.
    Contributed by Paul Brook <paul@nowt.org>
 
-This file is part of the GNU Fortran 95 runtime library (libgfor).
+This file is part of the GNU Fortran 95 runtime library (libgfortran).
 
 Libgfortran is free software; you can redistribute it and/or
-modify it under the terms of the GNU Lesser General Public
+modify it under the terms of the GNU General Public
 License as published by the Free Software Foundation; either
-version 2.1 of the License, or (at your option) any later version.
+version 3 of the License, or (at your option) any later version.
 
 Libgfortran 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.
+GNU General Public License for more details.
 
-You should have received a copy of the GNU Lesser General Public
-License along with libgfor; see the file COPYING.LIB.  If not,
-write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
 
-#include "libgfortran.h"
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
 
-#define ishftc4 prefix(ishftc4)
-GFC_INTEGER_4 ishftc4 (GFC_INTEGER_4, GFC_INTEGER_4, GFC_INTEGER_4);
+#include "libgfortran.h"
 
-#define ishftc8 prefix(ishftc8)
-GFC_INTEGER_8 ishftc8 (GFC_INTEGER_8, GFC_INTEGER_8, GFC_INTEGER_8);
+extern GFC_INTEGER_4 ishftc4 (GFC_INTEGER_4, GFC_INTEGER_4, GFC_INTEGER_4);
+export_proto(ishftc4);
 
 GFC_INTEGER_4
 ishftc4 (GFC_INTEGER_4 i, GFC_INTEGER_4 shift, GFC_INTEGER_4 size)
 {
-  GFC_INTEGER_4 mask;
-  GFC_UINTEGER_4 bits;
+  GFC_UINTEGER_4 mask, bits;
 
   if (shift < 0)
     shift = shift + size;
@@ -39,17 +39,48 @@ ishftc4 (GFC_INTEGER_4 i, GFC_INTEGER_4 shift, GFC_INTEGER_4 size)
   if (shift == 0 || shift == size)
     return i;
 
-  mask = (~(GFC_INTEGER_4)0) << size;
-  bits = i & ~mask;
-  return (i & mask) | (bits >> (size - shift)) | ((i << shift) & ~mask);
+  /* In C, the result of the shift operator is undefined if the right operand
+     is greater than or equal to the number of bits in the left operand. So we
+     have to special case it for fortran.  */
+  mask = ~((size == 32) ? (GFC_UINTEGER_4)0 : (~(GFC_UINTEGER_4)0 << size));
+
+  bits = i & mask;
+  
+  return (i & ~mask) | ((bits << shift) & mask) | (bits >> (size - shift));
 }
 
+extern GFC_INTEGER_8 ishftc8 (GFC_INTEGER_8, GFC_INTEGER_4, GFC_INTEGER_4);
+export_proto(ishftc8);
 
 GFC_INTEGER_8
-ishftc8 (GFC_INTEGER_8 i, GFC_INTEGER_8 shift, GFC_INTEGER_8 size)
+ishftc8 (GFC_INTEGER_8 i, GFC_INTEGER_4 shift, GFC_INTEGER_4 size)
+{
+  GFC_UINTEGER_8 mask, bits;
+
+  if (shift < 0)
+    shift = shift + size;
+
+  if (shift == 0 || shift == size)
+    return i;
+
+  /* In C, the result of the shift operator is undefined if the right operand
+     is greater than or equal to the number of bits in the left operand. So we
+     have to special case it for fortran.  */
+  mask = ~((size == 64) ? (GFC_UINTEGER_8)0 : (~(GFC_UINTEGER_8)0 << size));
+
+  bits = i & mask;
+  
+  return (i & ~mask) | ((bits << shift) & mask) | (bits >> (size - shift));
+}
+
+#ifdef HAVE_GFC_INTEGER_16
+extern GFC_INTEGER_16 ishftc16 (GFC_INTEGER_16, GFC_INTEGER_4, GFC_INTEGER_4);
+export_proto(ishftc16);
+
+GFC_INTEGER_16
+ishftc16 (GFC_INTEGER_16 i, GFC_INTEGER_4 shift, GFC_INTEGER_4 size)
 {
-  GFC_INTEGER_8 mask;
-  GFC_UINTEGER_8 bits;
+  GFC_UINTEGER_16 mask, bits;
 
   if (shift < 0)
     shift = shift + size;
@@ -57,7 +88,13 @@ ishftc8 (GFC_INTEGER_8 i, GFC_INTEGER_8 shift, GFC_INTEGER_8 size)
   if (shift == 0 || shift == size)
     return i;
 
-  mask = (~(GFC_INTEGER_8)0) << size;
-  bits = i & ~mask;
-  return (i & mask) | (bits >> (size - shift)) | ((i << shift) & ~mask);
+  /* In C, the result of the shift operator is undefined if the right operand
+     is greater than or equal to the number of bits in the left operand. So we
+     have to special case it for fortran.  */
+  mask = ~((size == 128) ? (GFC_UINTEGER_16)0 : (~(GFC_UINTEGER_16)0 << size));
+
+  bits = i & mask;
+  
+  return (i & ~mask) | ((bits << shift) & mask) | (bits >> (size - shift));
 }
+#endif