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/****************************************************************************
* *
* 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);
}
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