[Bug c++/89698] [7/8 Regression] Run-time error due to optimization of field access after cast at -Os/-O2 and higher

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89698

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri May  3 07:07:28 2019
New Revision: 270833

URL: https://gcc.gnu.org/viewcvs?rev=270833&root=gcc&view=rev
Log:
2019-05-03  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/89698
        * gimple-fold.c (canonicalize_constructor_val): Early out
        for constants, handle unfolded INTEGER_CSTs as they appear in
        C++ virtual table ctors.

        * g++.dg/tree-ssa/pr89698.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/tree-ssa/pr89698.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-fold.c
    trunk/gcc/testsuite/ChangeLog