[Bug optimization/13875] [tree-ssa] missed jump thread optimization on the tree-level

[law at gcc dot gnu dot org]

------- Additional Comments From law at gcc dot gnu dot org  2004-03-01 03:43 -------
The fundamental problem is the two conditionals have different types for their
arguments.  If I twiddle the C++ front-end to generate code with the proper types,
then we properly eliminate the second conditional (at least in the small simple
testcase provided).

I haven't looked, but I strongly suspect the fact that the C++ FE mucking up the
types is likely the cause of of missing many optimization opportunities.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13875