[Bug fortran/30420] IBCLR() fails to properly handle clearing the sign bit.

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

------- Comment #1 from brooks at gcc dot gnu dot org  2007-01-10 05:46 -------
Subject: Bug 30420

Author: brooks
Date: Wed Jan 10 05:46:13 2007
New Revision: 120634

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=120634
Log:
PR 30381
PR 30420
* fortran/simplify.c (convert_mpz_to_unsigned): New function.
        (convert_mpz_to_signed): New function, largely based on
        twos_complement().
        (twos_complement): Removed.
        (gfc_simplify_ibclr): Add conversions to and from an
        unsigned representation before bit-twiddling.
        (gfc_simplify_ibset): Same.
        (gfc_simplify_ishftc): Add checks for overly large
        constant arguments, only check the third argument if
        it's present, carry over high bits into the result as
        appropriate, and perform the final conversion back to
        a signed representation using the correct sign bit.
        (gfc_simplify_not): Removed unnecessary masking.
* testsuite/gfortran.dg/
        * chkbits.f90: Added IBCLR tests; test calls for
        different integer kinds.
        * ishft.f90: Renamed to ishft_1.f90...
        * ishft_1.f90: ...Renamed from ishft.f90.
        * ishft_2.f90: New test.
        * ishft_3.f90: New test.


Added:
    trunk/gcc/testsuite/gfortran.dg/ishft_1.f90
      - copied unchanged from r120594,
trunk/gcc/testsuite/gfortran.dg/ishft.f90
    trunk/gcc/testsuite/gfortran.dg/ishft_2.f90
    trunk/gcc/testsuite/gfortran.dg/ishft_3.f90
Removed:
    trunk/gcc/testsuite/gfortran.dg/ishft.f90
Modified:
    trunk/gcc/fortran/ChangeLog
    trunk/gcc/fortran/simplify.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gfortran.dg/chkbits.f90


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30420