------- Comment #16 from steven at gcc dot gnu dot org 2005-12-27 00:58 ------- Created an attachment (id=10557) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10557&action=view) Make hash_rtx and exp_equiv_p take MEM_ATTRS into accoutn
The test cases don't fail with GCC 4.2 anymore, but with GCC 4.1 they both still fail. I think the right thing to do is to make the expressions not look the same to the dataflow equations -- after all they _are_ not the same. But with this patch I'm unsure what will happen with e.g. loads from different fields of a union for which the MEM address looks the same. The MEM_ATTRS will be different, so with my patch we won't see them as equivalent loads, I think. But I haven't actually tested that. I haven't even tested the patch yet really, but it does make the wrong-code problem go away for me. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25130
