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[Bug middle-end/51233] [ipa-iterations] running multiple passes of early IPA on zlib produces more optimal code
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 14 Aug 2012 08:23:16 +0000
- Subject: [Bug middle-end/51233] [ipa-iterations] running multiple passes of early IPA on zlib produces more optimal code
- Auto-submitted: auto-generated
- References: <bug-51233-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51233
--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-08-14 08:23:16 UTC ---
Multiple iterations may still paper over missed-optimization bugs in passes.
Using LTO to drive the iteration makes more sense (well, if iterating makes
any sense ...), as it will consider the whole program when iterating, not just
a single translation unit.