[Bug tree-optimization/71815] SLSR misses several PHI candidate cases

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71815

--- Comment #11 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Author: wschmidt
Date: Mon Jun 26 14:19:33 2017
New Revision: 249649

URL: https://gcc.gnu.org/viewcvs?rev=249649&root=gcc&view=rev
Log:
[gcc]

2016-06-26  Bill Schmidt  <wschm...@linux.vnet.ibm.com>

        PR tree-optimization/71815
        * gimple-ssa-strength-reduction.c (uses_consumed_by_stmt): New
        function.
        (find_basis_for_candidate): Call uses_consumed_by_stmt rather than
        has_single_use.
        (slsr_process_phi): Likewise.
        (replace_uncond_cands_and_profitable_phis): Don't replace a
        multiply candidate with a stride of 1 (copy or cast).
        (phi_incr_cost): Call uses_consumed_by_stmt rather than
        has_single_use.
        (lowest_cost_path): Likewise.
        (total_savings): Likewise.

[gcc/testsuite]

2016-06-26  Bill Schmidt  <wschm...@linux.vnet.ibm.com>

        PR tree-optimization/71815
        * gcc.dg/tree-ssa/slsr-35.c: Remove -fno-code-hoisting workaround.
        * gcc.dg/tree-ssa/slsr-36.c: Likewise.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog