[Bug middle-end/48590] Alias analysis confused by builtin-stack-save/restore

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48590

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-04-14 
12:19:35 UTC ---
Author: rguenth
Date: Thu Apr 14 12:19:28 2011
New Revision: 172427

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=172427
Log:
2011-04-14  Richard Guenther  <rguent...@suse.de>

    PR tree-optimization/48590
    * tree-ssa-alias.c (ref_maybe_used_by_call_p_1): Handle
    BUILT_IN_ALLOCA, BUILT_IN_STACK_SAVE and BUILT_IN_STACK_RESTORE.
    (call_may_clobber_ref_p_1): Handle BUILT_IN_ALLOCA and
    BUILT_IN_STACK_SAVE.
    * tree-ssa-dce.c (propagate_necessity): Handle
    BUILT_IN_ALLOCA, BUILT_IN_STACK_SAVE and BUILT_IN_STACK_RESTORE.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-alias.c
    trunk/gcc/tree-ssa-dce.c