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[PATCH] Avoid redundant calls to filesystem::status_known

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: Thu, 4 Jan 2018 13:47:49 +0000
Subject: [PATCH] Avoid redundant calls to filesystem::status_known
Authentication-results: sourceware.org; auth=none

Useing exists(file_status) inside exists(const path&, error_code&)
means we call status_known twice, because exists(file_status) calls it
internally. By inlining the exists(file_status) logic into the outer
function we avoid the redundant call.

	* include/bits/fs_ops.h (exists(const path&, error_code&))): Only
	check status_known once.
	* include/experimental/bits/fs_ops.h: Likewise.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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