[Bug tree-optimization/77824] unreachable code in SLSR GIMPLE pass

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77824

--- Comment #7 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Author: wschmidt
Date: Mon Oct 10 18:39:41 2016
New Revision: 240945

URL: https://gcc.gnu.org/viewcvs?rev=240945&root=gcc&view=rev
Log:
2016-10-10  Bill Schmidt  <wschm...@linux.vnet.ibm.com>

        PR tree-optimization/77824
        * gimple-ssa-strength-reduction.c (stmt_cost): Explicitly return
        zero cost for copies.
        (find_candidates_dom_walker::before_dom_children): Replace
        MODIFY_EXPR with SSA_NAME.
        (replace_mult_candidate): Likewise.
        (replace_profitable_candidates): Likewise.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-ssa-strength-reduction.c