diff options
Diffstat (limited to 'gnu/lib/libg++/g++-include/hash.cc')
| -rw-r--r-- | gnu/lib/libg++/g++-include/hash.cc | 56 |
1 files changed, 0 insertions, 56 deletions
diff --git a/gnu/lib/libg++/g++-include/hash.cc b/gnu/lib/libg++/g++-include/hash.cc deleted file mode 100644 index 4f16f975989..00000000000 --- a/gnu/lib/libg++/g++-include/hash.cc +++ /dev/null @@ -1,56 +0,0 @@ -/* -Copyright (C) 1990 Free Software Foundation - written by Doug Lea (dl@rocky.oswego.edu) - -This file is part of the GNU C++ Library. This library is free -software; you can redistribute it and/or modify it under the terms of -the GNU Library General Public License as published by the Free -Software Foundation; either version 2 of the License, or (at your -option) any later version. This library 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 Library General Public License for more details. -You should have received a copy of the GNU Library General Public -License along with this library; if not, write to the Free Software -Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. -*/ - -#ifdef __GNUG__ -#pragma implementation -#endif -#include <builtin.h> - -/* - some useful hash functions -*/ - -unsigned int hashpjw(const char* x) // From Dragon book, p436 -{ - unsigned int h = 0; - unsigned int g; - - while (*x != 0) - { - h = (h << 4) + *x++; - if ((g = h & 0xf0000000) != 0) - h = (h ^ (g >> 24)) ^ g; - } - return h; -} - -unsigned int multiplicativehash(int x) -{ - // uses a const close to golden ratio * pow(2,32) - return ((unsigned)x) * 2654435767; -} - - -unsigned int foldhash(double x) -{ - union { unsigned int i[2]; double d; } u; - u.d = x; - unsigned int u0 = u.i[0]; - unsigned int u1 = u.i[1]; - return u0 ^ u1; -} - |