[Bug debug/49522] Divide by zero in validate_subreg in emit-rtl.c:695

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49522

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-07-07 16:06:01 UTC ---
Author: jakub
Date: Thu Jul  7 16:05:55 2011
New Revision: 175987

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=175987
Log:
    PR debug/49522
    * df-problems.c (dead_debug_reset): Remove dead_debug_uses
    referencing debug insns that have been reset.
    (dead_debug_insert_before): Don't assert reg is non-NULL,
    instead return immediately if it is NULL.

    * gcc.dg/debug/pr49522.c: New test.


M    gcc/ChangeLog
A    gcc/testsuite/gcc.dg/debug/pr49522.c
M    gcc/testsuite/ChangeLog
M    gcc/df-problems.c

Added:
    trunk/gcc/testsuite/gcc.dg/debug/pr49522.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/df-problems.c
    trunk/gcc/testsuite/ChangeLog