c++/4150: [MAILER-DAEMON@sourceware.cygnus.com: failure notice]

[Felix von Leitner <leitner at fefe dot de>]

>Number:         4150
>Category:       c++
>Synopsis:       catastrophic performance decrease in C++ code
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          pessimizes-code
>Submitter-Id:   net
>Arrival-Date:   Mon Aug 27 18:26:02 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Felix von Leitner
>Release:        3.0.1
>Organization:
>Environment:
System: Linux hellhound 2.4.9 #4 Wed Aug 22 00:23:39 CEST 2001 i686 unknown
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ./configure --program-transform-name=s/^/e/ --prefix=/usr --enable-threads --enable-haifa --with-local-prefix=/usr/local
>Description:
	on one of my projects, a log file analyser, gcc 3.0.1 not only
	takes twice the time to compile the program compared to gcc
	2.95.3 (both times with -O3 -funroll-loops in i686-linux), the
	resulting code takes 30 seconds as compared to 4.25 seconds for
	the exact same data.  Please find the source code and a test log
	file at ftp://foobar.math.fu-berlin.de/pub/fefe/logauswerter/
>How-To-Repeat:
	Compile the logauswerter.C found above with -O3 -funroll-loops
	and run it by piping the bunzip2'd log.bz2 in it.
>Fix:
	

----- End forwarded message -----
>Release-Note:
>Audit-Trail:
>Unformatted:
 ----- Forwarded message from MAILER-DAEMON@sourceware.cygnus.com -----
 
 Date: 27 Aug 2001 23:35:52 -0000
 From: MAILER-DAEMON@sourceware.cygnus.com
 To: leitner@fefe.de
 Subject: failure notice
 
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 Date: 27 Aug 2001 23:35:46 -0000
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 Subject: catastrophic performance decrease in C++ code
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