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[Bug rtl-optimization/39871] [4.3/4.4/4.5 regression] Code size increase on ARM due to poor register allocation
- 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: 10 Feb 2010 17:23:41 -0000
- Subject: [Bug rtl-optimization/39871] [4.3/4.4/4.5 regression] Code size increase on ARM due to poor register allocation
- References: <bug-39871-17592@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #13 from steven at gcc dot gnu dot org 2010-02-10 17:23 -------
As comment #12 shows, CSE can't do much about this -- there is no common
subexpression before register allocation.
Vlad, this is another one that you probably should have a look at, please.
I will have a look at the difference between the pre-regalloc RTL in 118474 and
118475. Perhaps there is something that can be recovered. But fundamentally
this is something the register allocator should be able to handle.
--
steven at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |steven at gcc dot gnu dot
|dot org |org
Status|REOPENED |ASSIGNED
Last reconfirmed|2010-02-10 16:27:56 |2010-02-10 17:23:41
date| |
Summary|[4.3/4.4/4.5 regression] |[4.3/4.4/4.5 regression]
|Code size increase on ARM |Code size increase on ARM
|due to inferior CSE |due to poor register
| |allocation
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39871