[Bug libstdc++/11722] [3.4 only] Unbuffered filebuf::sgetn is slow

["cvs-commit at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2004-09-19 11:26 -------
Subject: Bug 11722

CVSROOT:	/cvs/gcc
Module name:	gcc
Branch: 	gcc-3_4-branch
Changes by:	paolo@gcc.gnu.org	2004-09-19 11:26:48

Modified files:
	libstdc++-v3   : ChangeLog 
	libstdc++-v3/include/std: std_fstream.h 
	libstdc++-v3/include/bits: fstream.tcc 
Added files:
	libstdc++-v3/testsuite/performance/27_io: filebuf_sgetn_unbuf.cc 

Log message:
	2004-09-19  Paolo Carlini  <pcarlini@suse.de>
	
	* include/bits/fstream.tcc (xsgetn): Slightly tweak conditional,
	as per Nathan's original suggestion.
	
	2004-09-19  Nathan Myers  <ncm@cantrip.org>
	
	* include/bits/fstream.tcc (xsgetn): Slightly tweak the recent fix
	for 11722: copy can replace move; the common case is __avail == 0.
	
	2004-09-19  Paolo Carlini  <pcarlini@suse.de>
	
	PR libstdc++/11722
	* include/std/std_fstream.h (xsgetn): Declare only.
	* include/bits/fstream.tcc (xsgetn): Define, optimize for the
	always_noconv() case: when __n > __buflen, copy the available
	buffer and issue a direct read.
	* testsuite/performance/27_io/filebuf_sgetn_unbuf.cc: New.
	
	* include/bits/fstream.tcc (xsputn): Minor tweak, reorder a
	conditional.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libstdc++-v3/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.2224.2.174&r2=1.2224.2.175
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libstdc++-v3/include/std/std_fstream.h.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.61&r2=1.61.6.1
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libstdc++-v3/include/bits/fstream.tcc.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.116.4.6&r2=1.116.4.7
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libstdc++-v3/testsuite/performance/27_io/filebuf_sgetn_unbuf.cc.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=NONE&r2=1.1.10.1



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11722