2008-07-31 Geert Bosch <bosch@adacore.com>

	* arit64.c:
	New file implementing __gnat_mulv64 signed integer multiplication with
	overflow checking

	* fe.h (Backend_Overflow_Checks_On_Target): Define for use by Gigi

	* gcc-interface/gigi.h:
	(standard_types): Add ADT_mulv64_decl
	(mulv64_decl): Define subprogram declaration for __gnat_mulv64

	* gcc-interface/utils.c:
	(init_gigi_decls): Add initialization of mulv64_decl

	* gcc-interface/trans.c:
	(build_unary_op_trapv): New function
	(build_binary_op_trapv): New function
	(gnat_to_gnu): Use the above functions instead of
	build_{unary,binary}_op

	* gcc-interface/Makefile.in
	(LIBGNAT_SRCS): Add arit64.c
	(LIBGNAT_OBJS): Add arit64.o



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@138384 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 58 insertions, 0 deletions

diff --git a/gcc/ada/arit64.c b/gcc/ada/arit64.c
new file mode 100644
index 00000000000..c21f67c9418
--- /dev/null
+++ b/gcc/ada/arit64.c
@@ -0,0 +1,58 @@
+/****************************************************************************
+ *                                                                          *
+ *                         GNAT COMPILER COMPONENTS                         *
+ *                                                                          *
+ *                             A R I T 6 4 . C                              *
+ *                                                                          *
+ *                          C Implementation File                           *
+ *                                                                          *
+ *         Copyright (C) 2008, Free Software Foundation, Inc.               *
+ *                                                                          *
+ * GNAT is free software;  you can  redistribute it  and/or modify it under *
+ * terms of the  GNU General Public License as published  by the Free Soft- *
+ * ware  Foundation;  either version 2,  or (at your option) any later ver- *
+ * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
+ * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License *
+ * for  more details.  You should have  received  a copy of the GNU General *
+ * Public License  distributed with GNAT;  see file COPYING.  If not, write *
+ * to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, *
+ * Boston, MA 02110-1301, USA.                                              *
+ *                                                                          *
+ * As a  special  exception,  if you  link  this file  with other  files to *
+ * produce an executable,  this file does not by itself cause the resulting *
+ * executable to be covered by the GNU General Public License. This except- *
+ * ion does not  however invalidate  any other reasons  why the  executable *
+ * file might be covered by the  GNU Public License.                        *
+ *                                                                          *
+ * GNAT was originally developed  by the GNAT team at  New York University. *
+ * Extensive contributions were provided by Ada Core Technologies Inc.      *
+ *                                                                          *
+ ****************************************************************************/
+
+extern void __gnat_rcheck_10(char *file, int line)
+  __attribute__ ((__noreturn__));
+
+long long int __gnat_mulv64 (long long int x, long long int y)
+{
+  unsigned neg = (x >= 0) ^ (y >= 0);
+  long long unsigned xa = x >= 0 ? (long long unsigned) x
+                                 : -(long long unsigned) x;
+  long long unsigned ya = y >= 0 ? (long long unsigned) y
+                                 : -(long long unsigned) y;
+  unsigned xhi = (unsigned) (xa >> 32);
+  unsigned yhi = (unsigned) (ya >> 32);
+  unsigned xlo = (unsigned) xa;
+  unsigned ylo = (unsigned) ya;
+  long long unsigned mid
+    = xhi ? (long long unsigned) xhi * (long long unsigned) ylo
+	 : (long long unsigned) yhi * (long long unsigned) xlo;
+  long long unsigned low = (long long unsigned) xlo * (long long unsigned) ylo;
+
+  if ((xhi && yhi) ||  mid + (low  >> 32) > 0x7fffffff + neg)
+    __gnat_rcheck_10 (__FILE__, __LINE__);
+
+  low += ((long long unsigned) (unsigned) mid) << 32;
+
+  return (long long int) (neg ? -low : low);
+}