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[Bug middle-end/19721] [meta-bug] optimizations that CSE still catches
- From: "steven at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 2 Mar 2005 11:50:12 -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 steven at gcc dot gnu dot org 2005-03-02 11:50 -------
Here is a nice one:
Working on insn:
(insn 215 214 216 15 (parallel [
(set (reg:DI 176)
(ashift:DI (reg:DI 175)
(const_int 3 [0x3])))
(clobber (reg:CC 17 flags))
]) -1 (nil)
(expr_list:REG_EQUAL (mult:DI (reg:DI 174)
(const_int 8 [0x8]))
(nil)))
Trying to fold rtx:
(mult:DI (reg:DI 174)
(const_int 8 [0x8]))
Returning new rtx:
(ashift:DI (reg:DI 174)
(const_int 3 [0x3]))
Sometimes I just hate REG_EQUAL notes...
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19721