[Bug rtl-optimization/32283] [4.3/4.4 regression] Missed induction variable optimization

[rakdver at gcc dot gnu dot org]

------- Comment #23 from rakdver at gcc dot gnu dot org  2008-11-20 08:06 -------
Subject: Bug 32283

Author: rakdver
Date: Thu Nov 20 08:05:12 2008
New Revision: 142035

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=142035
Log:
        PR rtl-optimization/32283
        * tree-ssa-loop-niter.c (scev_probably_wraps_p): Use type of the base
        of the induction variable to decide whether it may wrap.
        * tree-ssa-loop-ivopts.c (rewrite_use_compare): Emit the initialization
        of the bound before the loop.
        * simplify-rtx.c (simplify_binary_operation_1): Add two simplifications
        regarding AND.
        (simplify_plus_minus): Only fail if no simplification is possible.
        * loop-iv.c (simple_rhs_p): Consider reg + reg and reg << cst simple.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/loop-iv.c
    trunk/gcc/simplify-rtx.c
    trunk/gcc/tree-ssa-loop-ivopts.c
    trunk/gcc/tree-ssa-loop-niter.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32283