[Bug tree-optimization/29680] [4.3 Regression] Misscompilation of spec2006 gcc

["hjl at lucon dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #23 from hjl at lucon dot org  2006-11-09 15:47 -------
(In reply to comment #20)
>  > I am playing with some ideas how to fix this, unless I come up with
> something
> > soon, I will revert the patch (except for the testcase that I would like to
> > remain in the testsuite).
> 
> The best I was able to do is the following patch.  Virtual operand prunning
> removes all the symbols that the SMTs have in common, which causes this PR. 
> The patch adds artificial "conflict" symbols to all pairs of aliasing SMTs, to
> avoid this.  Just looking at the dump of the testcase for this PR, it appears
> quite expensive (there are a lot of new virtual operands); I will check what
> the memory behavior is on larger testcases.
> 

It failed during bootstrap:

/net/gnu-13/export/gnu/src/gcc/gcc/gcc/tree-dfa.c: In function
âfind_referenced_varsâ:
/net/gnu-13/export/gnu/src/gcc/gcc/gcc/tree-dfa.c:99: internal compiler error:
in mark_operand_necessary, at tree-ssa-dce.c:261
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
make[5]: *** [tree-dfa.o] Error 1


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29680