[Bug rtl-optimization/26244] [4.2 Regression] FAIL: gcc.c-torture/execute/builtin-bitops-1.c execution, -O3 -fomit-frame-pointer -funroll-loops

["danglin at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #33 from danglin at gcc dot gnu dot org  2006-08-04 14:15 -------
Subject: Bug 26244

Author: danglin
Date: Fri Aug  4 14:15:37 2006
New Revision: 115924

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=115924
Log:
        PR rtl-optimization/26244
        * cse.c (fold_rtx): Correctly associate shifts when const_arg1 and/or
        inner_const are negative or greater than or equal to the bitsize of
        MODE.  If SHIFT_COUNT_TRUNCATED is false, the values aren't associated.
        Otherwise, the values are masked using GET_MODE_BITSIZE (mode) - 1.
        Simplify complicated if statement.  For ASHIFT and LSHIFTRT, return
        CONST0_RTX (mode) when the new shift count is greater than or equal to
        to the bitsize of the object being shifted and XEXP (y, 0) has no side
        effects.


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


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26244