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From: Valera.Veryazov@teokem.lu.se
To: gcc-gnats@gcc.gnu.org
Subject: fortran/5837: bug in loop unrolling
Date: Tue, 05 Mar 2002 05:46:00 -0000	[thread overview]
Message-ID: <20020305133903.19118.qmail@sources.redhat.com> (raw)


>Number:         5837
>Category:       fortran
>Synopsis:       bug in loop unrolling
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Mar 05 05:46:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Valera.Veryazov@teokem.lu.se
>Release:        3.0.4
>Organization:
>Environment:
Linux Mandrake 8.1. GCC/G77 compiled from the source code.
>Description:
The code (see attachment) produces a Segnematation fault,
if flags " -O  -funroll-loops" are used.

Change of parameter to 12, 16 gives a correct result.
Also, a change of declaration Character *64 to, say,
Character*45 produces a funny number instead 0.

Removing -unroll-loops flag or using unrolling by hands
also 'fix' the problem.

>How-To-Repeat:
just compile the code with -O  -funroll-loops flags.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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             reply	other threads:[~2002-03-05 13:46 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-03-05  5:46 Valera.Veryazov [this message]
2002-04-13  7:23 toon

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