[Bug rtl-optimization/79450] [5/6/7 Regression] wrong code with loop at -O1

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79450

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Feb 13 15:39:59 2017
New Revision: 245390

URL: https://gcc.gnu.org/viewcvs?rev=245390&root=gcc&view=rev
Log:
        PR rtl-optimization/79388
        PR rtl-optimization/79450
        * combine.c (distribute_notes): When removing TEM_INSN for which
        corresponding dest has last value recorded, invalidate that last
        value.

        * gcc.c-torture/execute/pr79388.c: New test.
        * gcc.c-torture/execute/pr79450.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr79388.c
    trunk/gcc/testsuite/gcc.c-torture/execute/pr79450.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/combine.c
    trunk/gcc/testsuite/ChangeLog