Steven Bosscher wrote:
Are predicate checks free, or should there be some post-pass to clean up this kind of useless predication?
On IA-64, predicate checks are free in terms of run-time. There is the problem that unnecessary predicate checks might increase register lifetimes, causing extra register pressure. However, this would matter only if you are going to do some register allocation after eliminating the now unnecessary predicate checks, and that doesn't seem to be an issue here.
-- Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com
