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+/****************************************************************************
+ * *
+ * GNAT COMPILER COMPONENTS *
+ * *
+ * A R I T 6 4 . C *
+ * *
+ * C Implementation File *
+ * *
+ * Copyright (C) 2009, 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 3, 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. *
+ * *
+ * As a special exception 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. *
+ * *
+ * 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/>. *
+ * *
+ * 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);
+}