[Bug debug/52001] [4.7 Regression] Huge compile-time regression with var-tracking

[aoliva at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52001

--- Comment #6 from Alexandre Oliva <aoliva at gcc dot gnu.org> 2012-02-25 
12:09:48 UTC ---
Author: aoliva
Date: Sat Feb 25 12:09:41 2012
New Revision: 184572

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=184572
Log:
PR debug/52001
* alias.c (refs_newer_value_cb, refs_newer_value_p): New.
(get_addr): Walk canonical value's locs.  Avoid returning VALUEs
and locs that reference values newer than the non-canonical value
at hand.  Return the canonical value as a worst case.
(memrefs_conflict_p): Walk canonical value's locs.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/alias.c