[Bug tree-optimization/81556] [7/8 Regression] Wrong code at -O2

[aldyh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81556

--- Comment #10 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Author: aldyh
Date: Wed Sep 13 15:50:53 2017
New Revision: 252110

URL: https://gcc.gnu.org/viewcvs?rev=252110&root=gcc&view=rev
Log:
        PR tree-optimization/81555
        PR tree-optimization/81556
        * tree-ssa-reassoc.c (rewrite_expr_tree): Add NEXT_CHANGED argument,
        if true, force CHANGED for the recursive invocation.
        (reassociate_bb): Remember original length of ops array, pass
        len != orig_len as NEXT_CHANGED in rewrite_expr_tree call.

        * gcc.c-torture/execute/pr81555.c: New test.
        * gcc.c-torture/execute/pr81556.c: New test.

Added:
    branches/range-gen2/gcc/testsuite/gcc.c-torture/execute/pr81555.c
    branches/range-gen2/gcc/testsuite/gcc.c-torture/execute/pr81556.c
Modified:
    branches/range-gen2/gcc/ChangeLog
    branches/range-gen2/gcc/testsuite/ChangeLog
    branches/range-gen2/gcc/tree-ssa-reassoc.c