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[Bug target/26290] [4.1 Regression]: code pessimization wrt. GCC 4.0 probably due to TARGET_MEM_REF
- From: "rakdver at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 24 Feb 2006 15:20:29 -0000
- Subject: [Bug target/26290] [4.1 Regression]: code pessimization wrt. GCC 4.0 probably due to TARGET_MEM_REF
- References: <bug-26290-5637@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #14 from rakdver at gcc dot gnu dot org 2006-02-24 15:20 -------
Ivopts fail to use the complex addressing mode, thus forcing one more biv into
inner loop. Since this makes it impossible to allocate registers for the loop,
we get another penalty for spilling.
Changing the initial value makes us notice that we may perform IV elimination,
thus getting rid of the extra register.
--
rakdver at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |rakdver at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
Last reconfirmed|2006-02-19 09:13:57 |2006-02-24 15:20:29
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26290