optimization/2391: Exponential compilation time explosion in combine

[Craig Rodrigues]

The following reply was made to PR optimization/2391; it has been noted by GNATS.

From: Craig Rodrigues <rodrigc@mediaone.net>
To: rearnsha@arm.com, gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org,
   bjh21@netbsd.org, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org
Cc:  
Subject: Re: optimization/2391: Exponential compilation time explosion in combine
Date: Sat, 12 Jan 2002 15:13:04 -0500

 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=2391
 
 PR 5333 was marked as a duplicate of this bug.  Attachment from PR 5333
 added
 to this PR, with the following instructions:
 
 ===============================================================
 
 When compiling the attached code with -O, GCC (configured as above)
 seems to
 run forever, eating CPU but not leaking memory.  The command line (run
 from
 within the GCC source tree) was:
 
 ./xgcc -da -B. -O -v ~/mhz.i
 
 The -da produces dumps up to mhz.i.30.mach.  A workaround is to compile
 without -O.  This bug has been present since at least egcs 1.1.2.