[Bug tree-optimization/28632] VRP should understand bitwise OR and AND

[jakub at gcc dot gnu dot org]

------- Comment #21 from jakub at gcc dot gnu dot org  2010-07-09 19:40 -------
Subject: Bug 28632

Author: jakub
Date: Fri Jul  9 19:40:03 2010
New Revision: 162009

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162009
Log:
        PR tree-optimization/28632
        * tree-vrp.c (zero_nonzero_bits_from_vr): New function.
        (extract_range_from_binary_expr): Further optimize
        BIT_AND_EXPR and BIT_IOR_EXPR.

        * gcc.dg/tree-ssa/vrp51.c: New test.
        * gcc.dg/tree-ssa/vrp52.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/vrp51.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/vrp52.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vrp.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28632