[Bug tree-optimization/85712] [8/9 Regression] ICE in all_phi_incrs_profitable_1 at gcc/gimple-ssa-strength-reduction.c:3479

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85712

--- Comment #10 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Author: wschmidt
Date: Fri Jun  1 13:00:57 2018
New Revision: 261067

URL: https://gcc.gnu.org/viewcvs?rev=261067&root=gcc&view=rev
Log:
2018-06-01  Bill Schmidt  <wschm...@linux.ibm.com>

        PR tree-optimization/85712
        Backport from mainline:
        2018-05-23  Bill Schmidt  <wschm...@linux.ibm.com>

        PR tree-optimization/85712
        * gimple-ssa-strength-reduction.c (struct slsr_cand_d): Add
        first_interp field.
        (alloc_cand_and_find_basis): Initialize first_interp field.
        (slsr_process_mul): Modify first_interp field.
        (slsr_process_add): Likewise.
        (slsr_process_cast): Modify first_interp field for each new
        interpretation.
        (slsr_process_copy): Likewise.
        (dump_candidate): Dump first_interp field.
        (replace_mult_candidate): Process all interpretations, not just
        subsequent ones.
        (replace_rhs_if_not_dup): Likewise.
        (replace_one_candidate): Likewise.

        Backport from mainline:
        2018-05-25  Bill Schmidt  <wschm...@linux.ibm.com>

        PR tree-optimization/85712
        * gimple-ssa-strength-reduction.c (replace_one_candidate): Skip if
        this candidate has already been replaced in-situ by a copy.


Modified:
    branches/gcc-6-branch/gcc/ChangeLog
    branches/gcc-6-branch/gcc/gimple-ssa-strength-reduction.c