[Bug rtl-optimization/49847] [4.7/4.8/4.9 Regression] NULL deref in fold_rtx (prev_insn_cc0 == NULL)

[law at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49847

--- Comment #36 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Thu Feb 27 19:02:18 2014
New Revision: 208203

URL: http://gcc.gnu.org/viewcvs?rev=208203&root=gcc&view=rev
Log:
    PR rtl-optimization/49847
    * cse.c (fold_rtx) Handle case where cc0 setter and cc0 user
    are in different blocks.
    * doc/tm.texi (Condition Code Status): Update documention for
    relative locations of cc0-setter and cc0-user.

     PR rtl-optimization/49847
     * g++.dg/pr49847.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/pr49847.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cse.c
    trunk/gcc/doc/tm.texi
    trunk/gcc/testsuite/ChangeLog