------- Comment #11 from dberlin at gcc dot gnu dot org 2007-11-04 19:24 ------- Subject: Re: [4.0/4.1/4.2/4.3 Regression] Not elimintating the PHIs which have the same arguments
On 4 Nov 2007 15:45:59 -0000, rguenth at gcc dot gnu dot org <[EMAIL PROTECTED]> wrote: > > > ------- Comment #10 from rguenth at gcc dot gnu dot org 2007-11-04 15:45 > ------- > FRE doesn't replace a SSA_NAME with another SSA_NAME Also true. It will only replace non-ssa names with ssa-names. This is to avoid lengthening the range of variables. Replacing ssa names with other ssa names willy-nilly is not always a win. We eventually ended up with heuristics to not change loop depths of ssa names, etc. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28868
