[PATCH]: Add small amount of documentation on TODO_update_smt_usage

Daniel Berlin dberlin@dberlin.org
Tue Apr 4 01:29:00 GMT 2006

This adds a small section on preserving virtual SSA form to
doc/tree-ssa.texi, including info on when TODO_update_smt_usage should
be used.

Unfortunately, that hack is currently tied to what the pruning code is
going to do, so the reasons when the flag is required are extracted from
how the pruning code currently works, and should be updated when it

This all goes away if we go with mem-ssa, of course.

Better wording, etc, is of course appreciated.

Okay for mainline?

2006-04-03  Daniel Berlin  <dberlin@dberlin.org>

  * doc/tree-ssa.texi (Preserving virtual SSA form): New subsection.

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