------- Comment #16 from steven at gcc dot gnu dot org 2008-11-23 13:07 ------- Created an attachment (id=16751) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16751&action=view) Proof-of-concept patch
It is not terribly complicated to add hoisting to tree-ssa-pre.c. I have attached the result of roughly half a day of hacking. It is a proof-of-concept patch that demonstrates how hoisting could be added. It's not finished, tested, or even correct ;-) but it shows the general idea. For a "production-quality" version, one would have to make sure not to hoist expressions up too far (e.g. not further up than above the first block that generates the expression). -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23286
