[Bug tree-optimization/42027] [4.5 Regression] Performance regression in convolution loop optimization

[nbenoit at tuxfamily 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