Neal Becker wrote:
We are trying to track down a numerical problem with unuran that occurs on
gcc-4.3. I know that gcc now has a very extensive test suite, and bugs are
not common. I'm just wondering, are others finding similar problems with
gcc-4.3?
We are working on preparing a bug report. The symptoms are:
1) Problem disappears if -O0
2) Problem disappears if a printf is added
3) valgrind is silent
I'm seeing something vaguely similar, but more pointer oriented.
qhull has a routine for adding elements to a list (qh_setappend). At
the end it does:
*(++endp)= ((void *)0);
to set the last element to null to signify the end of the list.
With -O2 I see:
endp(8d0f5c0) = 0
after qh_setappend
&((*simplex)->e[4].p) = 8d0f5c4
((vertexT*)((*simplex)->e[4].p)) = 4
Without I get:
endp(95755c4) = 0
after qh_setappend
&((*simplex)->e[4].p) = 95755c4
((vertexT*)((*simplex)->e[4].p)) = 0
So, with -O2, the pointer apparently isn't incremented (8d0f5c0 !=
8d0f5c4), but without it is (95755c4 == 95755c4).
Thoughts?
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Orion Poplawski
Technical Manager 303-415-9701 x222
NWRA/CoRA Division FAX: 303-415-9702
3380 Mitchell Lane orion@xxxxxxxxxxxxx
Boulder, CO 80301 http://www.cora.nwra.com
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