54f37133b7
Mostly mechanical changes in preparation of extracting the Flang-RT "subproject" in #110217. This PR intends to only move pre-existing files to the new folder structure, with no behavioral change. Common files (headers, testing, cmake) shared by Flang-RT and Flang remain in `flang/`. Some cosmetic changes and files paths were necessary: * Relative paths to the new path for the source files and `add_subdirectory`. * Add the new location's include directory to `include_directories` * The unittest/Evaluate directory has unitests for flang-rt and Flang. A new `CMakeLists.txt` was introduced for the flang-rt tests. * Change the `#include` paths relative to the include directive * clang-format on the `#include` directives * Since the paths are part if the copyright header and include guards, a script was used to canonicalize those * `test/Runtime` and runtime tests in `test/Driver` are moved, but the lit.cfg.py mechanism to execute the will only be added in #110217.
30 lines
1.0 KiB
C++
30 lines
1.0 KiB
C++
//===-- lib/runtime/buffer.cpp ----------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "flang-rt/runtime/buffer.h"
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#include <algorithm>
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namespace Fortran::runtime::io {
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RT_OFFLOAD_API_GROUP_BEGIN
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// Here's a very old trick for shifting circular buffer data cheaply
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// without a need for a temporary array.
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void LeftShiftBufferCircularly(
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char *buffer, std::size_t bytes, std::size_t shift) {
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// Assume that we start with "efgabcd" and the left shift is 3.
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RT_DIAG_PUSH
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RT_DIAG_DISABLE_CALL_HOST_FROM_DEVICE_WARN
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std::reverse(buffer, buffer + shift); // "gfeabcd"
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std::reverse(buffer, buffer + bytes); // "dcbaefg"
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std::reverse(buffer, buffer + bytes - shift); // "abcdefg"
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RT_DIAG_POP
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}
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RT_OFFLOAD_API_GROUP_END
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} // namespace Fortran::runtime::io
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