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* optimization/4358: optimized code produces incorrect results
@ 2001-09-19 4:36 Ko.vanderSloot
0 siblings, 0 replies; 2+ messages in thread
From: Ko.vanderSloot @ 2001-09-19 4:36 UTC (permalink / raw)
To: gcc-gnats
>Number: 4358
>Category: optimization
>Synopsis: optimized code produces incorrect results
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Wed Sep 19 04:36:02 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Ko van der Sloot
>Release: Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.0/specs Configured with: ../gcc-3.0/configure Thread model: single gcc version 3
>Organization:
>Environment:
RedHat linux
>Description:
when optimized with -O1 (or higher) the program produces
different (incorrect) results compared to -O0 optimisation.
The same problem occurs with gcc2.95 on Intel-Solaris
On Sparc-Solaris -O1 produces the same results....
It is reported to me to work correct on Power PC's
>How-To-Repeat:
just compile with -O0 or -O1 to see the differences
>Fix:
printing Distance on line 10 of main (just before the if)
makes it work
>Release-Note:
>Audit-Trail:
>Unformatted:
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: optimization/4358: optimized code produces incorrect results
@ 2001-09-28 21:33 aoliva
0 siblings, 0 replies; 2+ messages in thread
From: aoliva @ 2001-09-28 21:33 UTC (permalink / raw)
To: Ko.vanderSloot, gcc-bugs, gcc-prs, nobody
Synopsis: optimized code produces incorrect results
State-Changed-From-To: open->closed
State-Changed-By: aoliva
State-Changed-When: Fri Sep 28 21:33:29 2001
State-Changed-Why:
You're falling prey of the excess precision of the x86 floating point registers. Try -ffloat-store.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=4358&database=gcc
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2001-09-28 21:33 UTC | newest]
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2001-09-19 4:36 optimization/4358: optimized code produces incorrect results Ko.vanderSloot
2001-09-28 21:33 aoliva
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