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45 lines
1.2 KiB
45 lines
1.2 KiB
6 years ago
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// Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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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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#pragma once
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#include <algorithm>
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#include <cstdint> // for int64_t
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#include <numeric>
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#include "paddle/fluid/platform/hostdevice.h"
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namespace paddle {
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namespace operators {
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namespace math {
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template <typename T>
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HOSTDEVICE inline int64_t BinarySearch(const T *x, int64_t num, const T &val) {
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int64_t beg = 0, end = num - 1;
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while (beg <= end) {
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auto mid = ((beg + end) >> 1);
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if (x[mid] == val)
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return mid;
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else if (x[mid] < val)
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beg = mid + 1;
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else
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end = mid - 1;
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}
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return -1;
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}
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} // namespace math
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} // namespace operators
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} // namespace paddle
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