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33 lines
1.0 KiB
33 lines
1.0 KiB
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <audio_utils/roundup.h>
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unsigned roundup(unsigned v)
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{
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// __builtin_clz is undefined for zero input
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if (v == 0) {
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v = 1;
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}
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int lz = __builtin_clz((int) v);
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unsigned rounded = ((unsigned) 0x80000000) >> lz;
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// 0x800000001 and higher are actually rounded _down_ to prevent overflow
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if (v > rounded && lz > 0) {
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rounded <<= 1;
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}
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return rounded;
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}
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