On Wed, 2005-08-24 at 18:19 -0400, Andrew Pinski wrote: > I am writing a "quick and dirty" DCE pass which is faster the > current DCE and does not do anything with stores/loads. FWIW, I've always been a fan of a very very simple DCE pass which can be scheduled often, possibly after every pass that might expose significant amounts of dead code -- leaving the heavier weight DCE pass to run just once or twice to pick up the rest of the crud.
> It passes over all the live SSA_NAMEs by looping over ssa_name. Which is not currently safe. > But I am running into places where SSA_NAMEs not released when they > become dead. Which is why it's not really safe. We have never required SSA_NAMEs to be released, we have only encouraged it to reduce memory consumption. Currently any code must not assume that unused SSA_NAMEs have been released. Jeff
