[Bug tree-optimization/65337] [5/6 Regression] bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

Jan Hubicka <hubicka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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   Last reconfirmed|2015-03-13 00:00:00         |2015-4-30

--- Comment #5 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Still ICE during LTObootstrap on PPC64 (gcc110). I will try to at least figure
out what goes wrong with the PHI (if it is wrong control dependency due to
critical edge or something else)

I suppose we can relax the check to:

  degenerate_phi_p (phi) || SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_phi_result
(phi)

but we may need to trigger SSA rewrite on resulting code as cddce will break
dominance conditions on the PHI.