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fortran/5837: bug in loop unrolling
- From: Valera dot Veryazov at teokem dot lu dot se
- To: gcc-gnats at gcc dot gnu dot org
- Date: 5 Mar 2002 13:39:03 -0000
- Subject: fortran/5837: bug in loop unrolling
- Reply-to: Valera dot Veryazov at teokem dot lu dot se
>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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