Re: c/7344: performance regression on huge case statements

[Daniel Berlin <dberlin@dberlin.org>]

The following reply was made to PR c/7344; it has been noted by GNATS.

From: Daniel Berlin <dberlin@dberlin.org>
To: Nathanael Nerode <neroden@twcny.rr.com>
Cc: gcc-gnats@gcc.gnu.org, rschiele@uni-mannheim.de,
	gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org, jh@suse.cz
Subject: Re: c/7344: performance regression on huge case statements
Date: Thu, 10 Oct 2002 22:08:47 -0400

 On Thursday, October 10, 2002, at 10:04  PM, Nathanael Nerode wrote:
 
 > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit- 
 > trail&database=gcc&pr=7344
 >
 > I'm tired of investigating this, but it seems likely that the problem
 > was introduced with the introduction of et-forest.c, since that's  
 > where the loop is.  This was introduced by Pavel Nejedly and committed  
 > to mainline by Jan Hubicka (along with most of the surrounding code).
 >
 > (So that's why I'm ccing you; it looks like you caused it, so maybe  
 > you  can figure out how to fix it. :-/)
 >
 As I mentioned, this is likely a known problem, with a known fix.
 
 Jan, if you don't have plans to make it constant time soon, i suggest  
 we cache the info using the patch that is on the tree-ssa branch.
 
 > --Nathanael
 >
 >