75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
/* Copyright 2015 The TensorFlow Authors. All Rights Reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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#ifndef TENSORFLOW_STREAM_EXECUTOR_LIB_HUMAN_READABLE_H_
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#define TENSORFLOW_STREAM_EXECUTOR_LIB_HUMAN_READABLE_H_
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#include <assert.h>
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#include <limits>
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#include "absl/strings/str_format.h"
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#include "tensorflow/stream_executor/platform/port.h"
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namespace stream_executor {
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namespace port {
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class HumanReadableNumBytes {
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public:
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static std::string ToString(int64 num_bytes) {
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if (num_bytes == std::numeric_limits<int64>::min()) {
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// Special case for number with not representable nagation.
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return "-8E";
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}
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const char* neg_str = GetNegStr(&num_bytes);
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// Special case for bytes.
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if (num_bytes < 1024LL) {
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// No fractions for bytes.
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return absl::StrFormat("%s%dB", neg_str, num_bytes);
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}
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static const char units[] = "KMGTPE"; // int64 only goes up to E.
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const char* unit = units;
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while (num_bytes >= (1024LL) * (1024LL)) {
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num_bytes /= (1024LL);
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++unit;
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assert(unit < units + sizeof(units));
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}
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if (*unit == 'K') {
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return absl::StrFormat("%s%.1f%c", neg_str, num_bytes / 1024.0, *unit);
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}
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return absl::StrFormat("%s%.2f%c", neg_str, num_bytes / 1024.0, *unit);
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}
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private:
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template <typename T>
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static const char* GetNegStr(T* value) {
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if (*value < 0) {
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*value = -(*value);
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return "-";
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} else {
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return "";
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}
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}
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};
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} // namespace port
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} // namespace stream_executor
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#endif // TENSORFLOW_STREAM_EXECUTOR_LIB_HUMAN_READABLE_H_
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