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Problem with tree-ssa-loop-ivopts.c:get_computation-cost
- From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
- To: gcc at gcc dot gnu dot org
- Date: Thu, 30 Jun 05 18:18:36 EDT
- Subject: Problem with tree-ssa-loop-ivopts.c:get_computation-cost
This function generates RTL from an expression to see how many RTL insns
it is. But this causes a problem compiling the Ada ACATS test cxa4006.
The problem is when part of the expression has a location. In that
case, record_block_change is called and that relies on
cfun->ib_boundaries_block being set. But it isn't because we aren't
expanding stuff "for real". A kludge would be to test that field, but
what's the proper way?
Also, seq_cost really should be looking at next_real_insn, not NEXT_INSN,
since any notes shouldn't be counted.