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jeremybenn |
/****************************************************************************
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* *
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* GNAT COMPILER COMPONENTS *
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* *
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* A R I T 6 4 . C *
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* *
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* C Implementation File *
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* *
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* Copyright (C) 2009, Free Software Foundation, Inc. *
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* *
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* GNAT is free software; you can redistribute it and/or modify it under *
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* terms of the GNU General Public License as published by the Free Soft- *
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* ware Foundation; either version 3, or (at your option) any later ver- *
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* sion. GNAT is distributed in the hope that it will be useful, but WITH- *
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* OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
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* or FITNESS FOR A PARTICULAR PURPOSE. *
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* *
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* As a special exception under Section 7 of GPL version 3, you are granted *
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* additional permissions described in the GCC Runtime Library Exception, *
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* version 3.1, as published by the Free Software Foundation. *
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* *
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* You should have received a copy of the GNU General Public License and *
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* a copy of the GCC Runtime Library Exception along with this program; *
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* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see *
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* <http://www.gnu.org/licenses/>. *
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* *
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* GNAT was originally developed by the GNAT team at New York University. *
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* Extensive contributions were provided by Ada Core Technologies Inc. *
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* *
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****************************************************************************/
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extern void __gnat_rcheck_10(char *file, int line)
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__attribute__ ((__noreturn__));
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long long int __gnat_mulv64 (long long int x, long long int y)
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{
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unsigned neg = (x >= 0) ^ (y >= 0);
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long long unsigned xa = x >= 0 ? (long long unsigned) x
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: -(long long unsigned) x;
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long long unsigned ya = y >= 0 ? (long long unsigned) y
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: -(long long unsigned) y;
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unsigned xhi = (unsigned) (xa >> 32);
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unsigned yhi = (unsigned) (ya >> 32);
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unsigned xlo = (unsigned) xa;
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unsigned ylo = (unsigned) ya;
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long long unsigned mid
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= xhi ? (long long unsigned) xhi * (long long unsigned) ylo
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: (long long unsigned) yhi * (long long unsigned) xlo;
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long long unsigned low = (long long unsigned) xlo * (long long unsigned) ylo;
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if ((xhi && yhi) || mid + (low >> 32) > 0x7fffffff + neg)
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__gnat_rcheck_10 (__FILE__, __LINE__);
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low += ((long long unsigned) (unsigned) mid) << 32;
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return (long long int) (neg ? -low : low);
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}
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