[Bug tree-optimization/32044] [4.3/4.4 Regression] final value replacement too aggressive for e.g. targets with no native div/mod insns

[rakdver at gcc dot gnu dot org]

------- Comment #65 from rakdver at gcc dot gnu dot org  2008-12-12 20:34 -------
Subject: Bug 32044

Author: rakdver
Date: Fri Dec 12 20:32:47 2008
New Revision: 142719

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=142719
Log:
        PR tree-optimization/32044
        * tree-scalar-evolution.h (expression_expensive_p): Declare.
        * tree-scalar-evolution.c (expression_expensive_p): New function.
        (scev_const_prop): Avoid introducing expensive expressions.
        * tree-ssa-loop-ivopts.c (may_eliminate_iv): Ditto.

        * gcc.dg/pr34027-1.c: Change outcome.
        * gcc.dg/tree-ssa/pr32044.c: New test.


Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr32044.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/pr34027-1.c
    trunk/gcc/tree-scalar-evolution.c
    trunk/gcc/tree-scalar-evolution.h
    trunk/gcc/tree-ssa-loop-ivopts.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32044