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optimization/4231: a gcc-3.0.1 optimization bug

To: gcc-gnats at gcc dot gnu dot org
Subject: optimization/4231: a gcc-3.0.1 optimization bug
From: bh at techhouse dot org
Date: 4 Sep 2001 23:30:58 -0000
Reply-To: bh at techhouse dot org

>Number:         4231
>Category:       optimization
>Synopsis:       a gcc-3.0.1 optimization bug
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Sep 04 16:36:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Benoit Hudson
>Release:        3.0.1
>Organization:
>Environment:
i386-glibc21-linux  (redhat 7.2)
>Description:
gcc-3.0.1 seems to optimize out createmap.cpp:418 
(grade==maxgrade) in some circumstances.  The correct 
program should print out an "is ok" line every time
it prints out an "is best" line.  The incorrect program
aborts.

This works on sparc-sun-solaris28 / 2.95.2 ,
i386-glibc21-linux / 2.96(redhat),
i386-glibc21-linux / 3.0.1 up to -O1

It fails on i386-glibc21-linux / 3.0.1 with -O2 and above.
>How-To-Repeat:
gcc-3.0.1 -O2 createmap.ii -o createmap
createmap 10 10 10 > file
less file
# warning: when it works, file contains binary data
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="createmap.ii"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="createmap.ii"

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