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[PATCH] PR libstdc++/90634 reduce allocations in filesystem::path construction

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Tue, 28 May 2019 17:10:57 +0100
Subject: [PATCH] PR libstdc++/90634 reduce allocations in filesystem::path construction

	PR libstdc++/90634
	* src/filesystem/path.cc (path::_M_split_cmpts()): Fix check for "/".
	* testsuite/27_io/filesystem/path/construct/90634.cc: New test.
	* testsuite/experimental/filesystem/path/construct/90634.cc: New test.

	PR libstdc++/90634
	* include/bits/fs_path.h (path::path(path&&)): Only call
	_M_split_cmpts() for a path with multiple components.
	(path::_S_is_dir_sep()): Add missing 'static' keyword to function.
	* include/experimental/bits/fs_path.h: Likewise.
	* src/filesystem/path.cc (path::_M_split_cmpts()): Count number of
	components and reserve space in vector. Return early when there is
	only one component.
	* src/filesystem/std-path.cc (path::_M_split_cmpts()): Likewise.

Tested x86_64-linux, committed to gcc-8-branch.

Attachment: patch-gcc8.txt
Description: Text document

Follow-Ups:
- Re: [PATCH] PR libstdc++/90634 reduce allocations in filesystem::path construction
  - From: Jonathan Wakely

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