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c++/1562: g++ 2.96 x86 Code Generation bug for 64-bit integers

To: gcc-gnats at gcc dot gnu dot org
Subject: c++/1562: g++ 2.96 x86 Code Generation bug for 64-bit integers
From: colohan+gcc at cs dot cmu dot edu
Date: 5 Jan 2001 17:21:51 -0000
Reply-To: colohan+gcc at cs dot cmu dot edu

>Number:         1562
>Category:       c++
>Synopsis:       g++ 2.96 x86 Code Generation bug for 64-bit integers
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jan 05 09:26:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Chris Colohan
>Release:        gcc version 2.96 20000731 (Red Hat Linux 7.0)
>Organization:
>Environment:
Red Hat Linux 7.0 system running on an Intel machine.  Updated to newest gcc RPM (gcc-2.96-69) -- ie, this includes Red Hat's patches.
>Description:
Under certain conditions g++ seems to be producing invalid code for subtracting 64-bit unsigned integers.  With the attached test case, if compiled with -O0 or -O1 correct execution results.  With -O2 or -O3, garbage is left in the upper 32 bits of the result of the threadTimer2.current_time() call.  The lower 32 bits are correct.

If you run the attached test case compiled with -O0, the output is:

TEST PASSED!

If you run the attached test case compiled with -O2, the output is:

=== TEST FAILED! ===
threadTimer2.current_time() = 17868988680824959108
process2->nfetch = 1132270
threadTimer2.time_base = 333418
Abort
>How-To-Repeat:
Compile and run the attached test case with an optimization level of -O2 or higher.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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