GCC Bugzilla Bug 37261

With:

$ gcc --version
gcc (Debian 4.3.1-2) 4.3.1

running on x86-64, the code below produces seemingly spurious warnings about
integer overflow:

$ LANG=C gcc -c b.c
b.c: In function 'foo':
b.c:3: warning: integer overflow in expression
b.c:5: warning: integer overflow in expression

$ cat b.c
unsigned foo(int x)
{
        return ((x & 1) | 2) & 0x80000000;
        return ((x & 2) | 2) & 0x80000000;
        return ((x & 4) | 2) & 0x80000000;
}

Confirmed.

Testing a fix.

Caused by PR33691 fix btw.

Subject: Bug 37261

Author: jakub
Date: Fri Aug 29 18:59:13 2008
New Revision: 139784

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=139784
Log:
        PR c/37261
        * fold-const.c (fold_binary): In (X | C1) & C2 canonicalization
        compute new & and | in type rather than TREE_TYPE (arg0).

        * gcc.dg/pr37261.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr37261.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog

Subject: Bug 37261

Author: jakub
Date: Fri Aug 29 19:08:18 2008
New Revision: 139786

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=139786
Log:
        PR c/37261
        * fold-const.c (fold_binary): In (X | C1) & C2 canonicalization
        compute new & and | in type rather than TREE_TYPE (arg0).

        * gcc.dg/pr37261.c: New test.

Added:
    branches/gcc-4_3-branch/gcc/testsuite/gcc.dg/pr37261.c
Modified:
    branches/gcc-4_3-branch/gcc/ChangeLog
    branches/gcc-4_3-branch/gcc/fold-const.c
    branches/gcc-4_3-branch/gcc/testsuite/ChangeLog

Fixed.