------- Comment #22 from dberlin at gcc dot gnu dot org 2006-10-24 14:23 ------- (In reply to comment #19) > So it is indeed chicken and egg ;) load-PRE does not PRE the loads if the > loop > is not in do-while form, and we won't hoist the loop header copies until the > loads are PREd. As to comment #13, if we are able to "clean" the two > innermost > loops > of a nest that is already a good improvement. Though from all the experiments > it looks like it is advisable to write do-while loops with hoisted loop header > copies manually rather than for loops. >
So the PRE fixes i've got should help here, i think. Maybe not. :) -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23855
