mirror of
https://github.com/android/ndk-samples
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347273726c
PREBUILD_STATIC_LIBRARY PREBUILD_SHARED_LIBRARY LOCAL_STATIC_LIBRARIES LOCAL_SHARED_LIBRARIES
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/*
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* Copyright (C) 2016 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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*/
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#include <android/log.h>
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#include "gmath.h"
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#if defined(__GNUC__) && __GNUC__ >= 4
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#define GMATH_EXPORT __attribute__((visibility("default")))
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#elif defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)
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#define GMATH_EXPORT __attribute__((visibility("default")))
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#else
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#define GMATH_EXPORT
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#endif
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#define LOGE(...) \
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((void)__android_log_print(ANDROID_LOG_ERROR, "gmath::", __VA_ARGS__))
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/*
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* return 2 ^ n with multiplication implementation
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*/
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GMATH_EXPORT unsigned gpower(unsigned n) {
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if (n == 0)
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return 1;
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if (n > 31) {
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LOGE("error from power(%d): integer overflow", n);
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return 0;
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}
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unsigned val = gpower(n>>1) * gpower (n>>1);
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if (n & 1)
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val *= 2;
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return val;
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}
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