[Bug tree-optimization/64705] Bad code generation of sieve on x86-64 because of too aggressive IV optimizations

["amker at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64705

--- Comment #5 from amker at gcc dot gnu.org ---
Author: amker
Date: Fri Feb 13 05:44:46 2015
New Revision: 220676

URL: https://gcc.gnu.org/viewcvs?rev=220676&root=gcc&view=rev
Log:

    PR tree-optimization/64705
    * tree-ssa-loop-niter.h (expand_simple_operations): New parameter.
    * tree-ssa-loop-niter.c (expand_simple_operations): New parameter.
    * tree-ssa-loop-ivopts.c (extract_single_var_from_expr): New.
    (find_bivs, find_givs_in_stmt_scev): Pass new argument to
    expand_simple_operations.

    testsuite
    PR tree-optimization/64705
    * gcc.dg/tree-ssa/pr64705.c: New test.


Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr64705.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-loop-ivopts.c
    trunk/gcc/tree-ssa-loop-niter.c
    trunk/gcc/tree-ssa-loop-niter.h