This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug tree-optimization/42027] [4.5 Regression] Performance regression in convolution loop optimization
- From: "nbenoit at tuxfamily dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 1 Dec 2009 10:11:20 -0000
- Subject: [Bug tree-optimization/42027] [4.5 Regression] Performance regression in convolution loop optimization
- References: <bug-42027-18430@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #4 from nbenoit at tuxfamily dot org 2009-12-01 10:11 -------
It seems that this regression first appeared with revision 151080
* with -O1
GCC-4.4.2 7.4 s
GCC-trunk-r151078 7.4 s
GCC-trunk-r151079 7.4 s
GCC-trunk-r151080 9.4 s
GCC-trunk-r151081 9.4 s
GCC-trunk-r151082 9.4 s
Changelog for revision 151080
http://gcc.gnu.org/ml/gcc-patches/2009-08/msg01336.html
009-08-25 Michael Matz <matz@suse.de>
* expr.h (jumpifnot_1, jumpif_1, do_jump_1): Declare.
* dojump.c (do_jump_by_parts_greater): Take two operands instead of
full expression.
(do_jump_by_parts_equality, do_compare_and_jump): Ditto.
(jumpifnot_1, jumpif_1): New wrappers for do_jump_1.
(do_jump): Split out code for simple binary comparisons into ...
(do_jump_1): ... this, taking the individual operands and code.
Change callers to helper function above accordingly.
* expr.c (expand_expr_real_1): Use jumpifnot_1 for simple binary
comparisons.
--
nbenoit at tuxfamily dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |matz at suse dot de
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42027