SCIENTIFIC-LINUX-USERS Archives

May 2012

SCIENTIFIC-LINUX-USERS@LISTSERV.FNAL.GOV
Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
ran into gcc 4.1.2 optimisation problem (SL5 x86_64)
From:
David Smith <[log in to unmask]>
Reply To:
David Smith <[log in to unmask]>
Date:
Tue, 8 May 2012 14:29:09 +0000
Content-Type:
multipart/signed
Parts/Attachments:
text/plain (943 bytes) , smime.p7s (4 kB) 
Hello,

I wanted to report running into an apparent gcc 4.1.2 bug; see the test case at https://svnweb.cern.ch/trac/lcgdm/attachment/ticket/514/tx.c (compare optimised/ non-optimised result)

This showed up on SL5 x86_64 (gcc 4.1.2). I haven't reported it to gcc as the the gcc 4.1 branch is closed and I can't reproduce the problem on a plain gcc from a current branch. I think it is most likely closely related to these old bugs:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32327
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39604

Our current proposal is to continue with SL5 builds with the optimiser on, but  with "-fno-tree-sink"

Yours,
David

--
-------------------------------------------------------------------------
David Smith       e-mail: [log in to unmask]        tel: +41 22 76 70394
Address: D. Smith, CERN G06600, Bat 28 R-003, 1211 Geneva 23, Switzerland
-------------------------------------------------------------------------

ATOM RSS1 RSS2