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Re: [PATCH] PR tree-optimization/16808: verify_ssa failed: Missingdefinition for SSA_NAME

Hi Jeff,


This seems like the wrong way to approach this problem and rather
heavy-weight.  We're really trying to get away from calling back
into the SSA renamer as often as we currently do.


I know it is rather heavy-weight. I thought about simply replacing all the uses of the results of the being deleted v_may_defs with their operands. But I could not find a clear way to achieve this. So I just delete the v_may_defs and do rename.


I suggest waiting until Andrew's immediate uses work is done -- it
may fix this problem as a side effect.  At the least it will make
updating the SSA graph trivial for this kind of thing.

Do you mean Andrew MacLeod? Where can I find the information of his immediate uses work? Is this <http://gcc.gnu.org/ml/gcc/2004-06/msg00902.html> the best place? Thanks.


cheers
--
Jie

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