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optimization/8284: GCC 3.2 mistakenly assumes unaliased buffers with -O3

From: davmac at ozonline dot com dot au
To: gcc-gnats at gcc dot gnu dot org
Date: 19 Oct 2002 14:26:37 -0000
Subject: optimization/8284: GCC 3.2 mistakenly assumes unaliased buffers with -O3
Reply-to: davmac at ozonline dot com dot au
>Number:         8284
>Category:       optimization
>Synopsis:       GCC 3.2 mistakenly assumes unaliased buffers with -O3
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Sat Oct 19 07:36:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Davin McCall
>Release:        3.2
>Organization:
>Environment:
Custom linux distribution, Pentium3, kernel version 2.4.18. Binutils 2.13. Gcc version 3.2
>Description:
When compiling glibc 2.3.1 I noticed problems with the readdir function for programs which were statically linked. On further investigation this turns out to be a bug in gcc. Some values are transferred from a buffer to some local variables, then the buffer is modified through a seperate pointer, and finally the values taken from the original buffer are compared to some values in the new buffer. However GCC (with -O3 option) doesn't seem to recognize that the old buffer is no longer available; it seems to assume that the two buffer pointers do not alias.

The function in question is __getdents from glibc, I have attached preprocessed source.

I have the generated assembly (with comments showing exactly where the problem occurs) as well, but can't seem to attach more than one file using this bug-reporting interface.
>How-To-Repeat:
gcc -S -O3 -fomit-frame-pointer getdents.i
>Fix:

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

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