From 2aa4a82499d4becd2284cdb482213d541b8804dd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 16:29:10 +0200 Subject: Adding upstream version 86.0.1. Signed-off-by: Daniel Baumann --- nsprpub/pr/src/misc/prlog2.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 nsprpub/pr/src/misc/prlog2.c (limited to 'nsprpub/pr/src/misc/prlog2.c') diff --git a/nsprpub/pr/src/misc/prlog2.c b/nsprpub/pr/src/misc/prlog2.c new file mode 100644 index 0000000000..2d476cd711 --- /dev/null +++ b/nsprpub/pr/src/misc/prlog2.c @@ -0,0 +1,27 @@ +/* -*- 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; +} -- cgit v1.2.3