[Bug debug/46171] [4.6 Regression] ICE: in gen_rtx_SUBREG, at emit-rtl.c:774 with -fno-tree-dce -g

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46171

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-11-09 
19:04:48 UTC ---
Author: jakub
Date: Tue Nov  9 19:04:44 2010
New Revision: 166504

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=166504
Log:
    PR debug/46171
    * df-problems.c (struct dead_debug_use, struct dead_debug): Move
    earlier.
    (df_set_unused_notes_for_mw, df_create_unused_note): Add DEBUG
    argument, call dead_debug_reset when adding REG_UNUSED note.
    (dead_debug_reset): New function.
    (df_note_bb_compute): Adjust df_set_unused_notes_for_mw and
    df_create_unused_note callers.

    * gcc.dg/pr46171.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr46171.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/df-problems.c
    trunk/gcc/testsuite/ChangeLog