This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug middle-end/17503] quadratic behaviour in invalid_mode_change_p
- From: "rth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 20 Sep 2004 21:41:02 -0000
- Subject: [Bug middle-end/17503] quadratic behaviour in invalid_mode_change_p
- References: <20040915165050.17503.drow@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From rth at gcc dot gnu dot org 2004-09-20 21:41 -------
"Huge"? Ok, so the thing's now at the top of the profile, but it still only uses
four (4) seconds of cpu time, so fixing it isn't going to help *that* much. I've
reduced the severity of the pr.
I suspect that you can only see this effect at -O0 with Truely Large synthetic
functions, as seen in insn-attrtab.c. So I am caring only a little at the moment.
Note that the "regression" comes not from the stack slot sharing per-se, but
actually honoring use_register_for_decl, which is true for scalar temporaries.
--
What |Removed |Added
----------------------------------------------------------------------------
Severity|critical |normal
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2004-09-20 21:41:01
date| |
Summary|[4.0 Regression] Huge |quadratic behaviour in
|performance regression in |invalid_mode_change_p
|invalid_mode_change_p |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17503