[Bug middle-end/62178] [5.0 regression] [AArch64] Performance regression on matrix matrix multiply due to r211211

[amker at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62178

--- Comment #6 from amker at gcc dot gnu.org ---
Author: amker
Date: Thu Dec 18 02:53:42 2014
New Revision: 218855

URL: https://gcc.gnu.org/viewcvs?rev=218855&root=gcc&view=rev
Log:

    PR tree-optimization/62178
    * tree-ssa-loop-ivopts.c (cheaper_cost_with_cand): New function.
    (iv_ca_replace): New function.
    (try_improve_iv_set): New parameter try_replace_p.
    Break local optimal fixed-point by calling iv_ca_replace.
    (find_optimal_iv_set_1): Pass new argument to try_improve_iv_set.

    gcc/testsuite/ChangeLog
    PR tree-optimization/62178
    * gcc.target/aarch64/pr62178.c: New test.


Added:
    trunk/gcc/testsuite/gcc.target/aarch64/pr62178.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-loop-ivopts.c