[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 #5 from Alexandre Oliva <aoliva at gcc dot gnu.org> 2012-02-25 
12:09:33 UTC ---
Author: aoliva
Date: Sat Feb 25 12:09:27 2012
New Revision: 184571

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=184571
Log:
PR debug/52001
* cselib.c (preserve_only_constants): Rename to...
(preserve_constants_and_equivs): ... this.  Split out...
(invariant_or_equiv_p): ... this.  Preserve plus expressions
of other preserved expressions too.
(cselib_reset_table): Adjust.
* var-tracking.c (reverse_op): Use canonical value to build
reverse operation.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cselib.c
    trunk/gcc/var-tracking.c