64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
// OpenSTA, Static Timing Analyzer
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// Copyright (c) 2024, Parallax Software, Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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#pragma once
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#include <cstdint>
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#include <cstddef>
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namespace sta {
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using std::size_t;
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const size_t hash_init_value = 5381;
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// Dan Bernstein, comp.lang.c.
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inline size_t
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hashSum(size_t hash,
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size_t add)
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{
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// hash * 31 ^ add.
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return ((hash << 5) + hash) ^ add;
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}
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inline void
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hashIncr(size_t &hash,
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size_t add)
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{
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// hash * 31 ^ add.
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hash = ((hash << 5) + hash) ^ add;
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}
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inline size_t
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nextMersenne(size_t n)
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{
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return (n + 1) * 2 - 1;
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}
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// Sadly necessary until c++ std::hash works for char *.
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size_t
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hashString(const char *str);
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// Pointer hashing is strongly discouraged because it causes results to change
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// from run to run. Use Network::id functions instead.
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#if __WORDSIZE == 64
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#define hashPtr(ptr) (reinterpret_cast<intptr_t>(ptr) >> 3)
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#else
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#define hashPtr(ptr) (reinterpret_cast<intptr_t>(ptr) >> 2)
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#endif
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} // namespace
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