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Quelle prlog2.c Sprache: C |
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #include "prbit.h" /* ** Compute the log of the least power of 2 greater than or equal to n */ PR_IMPLEMENT(PRIntn) PR_CeilingLog2(PRUint32 n) { PRIntn log2; PR_CEILING_LOG2(log2, n); return log2; } /* ** Compute the log of the greatest power of 2 less than or equal to n. ** This really just finds the highest set bit in the word. */ PR_IMPLEMENT(PRIntn) PR_FloorLog2(PRUint32 n) { PRIntn log2; PR_FLOOR_LOG2(log2, n); return log2; }
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2026-04-02