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

[jakub at gcc dot gnu.org]

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

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-07-07 
19:10:05 UTC ---
Author: jakub
Date: Thu Jul  7 19:10:01 2011
New Revision: 176003

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=176003
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.

Added:
    branches/gcc-4_6-branch/gcc/testsuite/gcc.dg/debug/pr49522.c
Modified:
    branches/gcc-4_6-branch/gcc/ChangeLog
    branches/gcc-4_6-branch/gcc/df-problems.c
    branches/gcc-4_6-branch/gcc/testsuite/ChangeLog