[Bug tree-optimization/86858] [9 Regression] GCC ICE at -O3 in as_a, at is-a.h:197

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86858

--- Comment #3 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Author: rsandifo
Date: Thu Aug  9 14:45:02 2018
New Revision: 263448

URL: https://gcc.gnu.org/viewcvs?rev=263448&root=gcc&view=rev
Log:
Restore flow_bb_inside_loop_p tests (PR 86858)

The series to remove vinfo_for_stmt also removed tests of
flow_bb_inside_loop_p if the call was simply testing whether the
statement was in the vectorisation region.  I'd tried to keep calls
that were testing whether the statement was in a particular loop
(inner or outer), but messed up in vect_is_simple_reduction and
removed calls that were actually needed.  This patch restores them.

I double-checked the other removed calls and I think these are
the only ones affected.

2018-08-08  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
        PR tree-optimization/86858
        * tree-vect-loop.c (vect_is_simple_reduction): Restore
        flow_bb_inside_loop_p calls.

gcc/testsuite/
        PR tree-optimization/86858
        * gcc.dg/vect/pr86858.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/vect/pr86858.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-loop.c