[Bug c/7543] no warning for always-false "if (!a & 0x4)" bitwise and on boolean value

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

------- Comment #14 from manu at gcc dot gnu dot org  2008-10-24 10:10 -------
Subject: Bug 7543

Author: manu
Date: Fri Oct 24 10:09:06 2008
New Revision: 141340

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=141340
Log:
2008-10-24  Manuel López-Ibáñez  <manu@gcc.gnu.org>

        PR c/7543
        * value-prof.c (gimple_stringop_fixed_value): Use parentheses
        around bit operation.
        * profile.c (is_edge_inconsistent): Likewise.
        * fold-const.c (truth_value_p): Move from here...
        * tree.h (truth_value_p): ... to here.
        * c-tree.h (c_expr): Update description of original_code.
        * c-typeck.c (parser_build_unary_op): Set original_code.
        (parser_build_binary_op): Update call to warn_about_parentheses.
        * c-common.c (warn_about_parentheses): Take two additional
        arguments of the operands. Use a switch. Quote operators
        appropriately. Define macro APPEARS_TO_BE_BOOLEAN_EXPR_P.
        Add warning about !x | y and !x & y.
        * c-common.h (warn_about_parentheses): Update declaration.
cp/     
        * typeck.c (build_x_binary_op): Update call to
        warn_about_parentheses.
        * parser.c (cp_parser_binary_expression): Add note about passing
        the correct code for unary expressions.
testsuite/
        * gcc.dg/Wparentheses-11.c: New.
        * g++.dg/warn/Wparentheses-25.C: New. XFAILED.

Added:
    trunk/gcc/testsuite/g++.dg/warn/Wparentheses-25.C
    trunk/gcc/testsuite/gcc.dg/Wparentheses-11.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-common.c
    trunk/gcc/c-common.h
    trunk/gcc/c-tree.h
    trunk/gcc/c-typeck.c
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/parser.c
    trunk/gcc/cp/typeck.c
    trunk/gcc/fold-const.c
    trunk/gcc/profile.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree.h
    trunk/gcc/value-prof.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=7543