[Bug rtl-optimization/89826] [9 Regression] wrong code at -O1

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89826

--- Comment #4 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed Mar 27 16:18:06 2019
New Revision: 269967

URL: https://gcc.gnu.org/viewcvs?rev=269967&root=gcc&view=rev
Log:
        PR rtl-optimization/87761
        PR rtl-optimization/89826
        * regcprop.c (copyprop_hardreg_forward_1): Move may_trap_p test
        slightly later.
        (pass_cprop_hardreg::execute): Call df_analyze after adding the
        note problem to get REG_DEAD/REG_UNUSED notes updated.

        PR rtl-optimization/87761
        PR rtl-optimization/89826
        * gcc.c-torture/execute/pr89826.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr89826.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/regcprop.c
    trunk/gcc/testsuite/ChangeLog