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[Bug middle-end/19721] [meta-bug] optimizations that CSE still catches
- From: "bonzini at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 26 Apr 2005 17:35:13 -0000
- Subject: [Bug middle-end/19721] [meta-bug] optimizations that CSE still catches
- References: <20050131123257.19721.steven@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From bonzini at gcc dot gnu dot org 2005-04-26 17:35 -------
Another thing that CSE does is promoting paradoxical subregs to regs. On
PowerPC at least, recursive calls of fold_rtx are almost ineffective except for
this. Such promotion helps because equiv_constant does not look into subregs.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19721