[Bug target/84272] [8 Regression] AddressSanitizer: heap-use-after-free ../../gcc/config/aarch64/cortex-a57-fma-steering.c:519 in fma_node::get_parity()

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84272

--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Feb 16 09:26:27 2018
New Revision: 257727

URL: https://gcc.gnu.org/viewcvs?rev=257727&root=gcc&view=rev
Log:
        PR target/84272
        * config/aarch64/cortex-a57-fma-steering.c (fma_forest::merge_forest):
        Use ++iter rather than iter++ for std::list iterators.
        (func_fma_steering::dfs): Likewise.  Don't delete nodes right away,
        defer deleting them until all nodes in the forest are processed.  Do
        free even leaf nodes.  Change to_process into auto_vec.

        * g++.dg/opt/pr84272.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/opt/pr84272.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/aarch64/cortex-a57-fma-steering.c
    trunk/gcc/testsuite/ChangeLog