[Bug c/41793] [4.3/4.4/4.5 Regression] About Long long bit field

["shenrfen at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #5 from shenrfen at gmail dot com  2009-10-22 15:46 -------
Thanks very much for all your reply.
But I also have another question, Why is the 3rd output 40bits?

int main()
{
        struct s t = {1, 2, 3};
        printf("0x%llx\n",(t.a-8));
        printf("0x%llx\n",(t.b-8));
        printf("0x%llx\n",(t.c-8));
}
the output is as following
0xfffffff9     (32 bit)
0xfffffffffa   (40 bit)
0xfffffffffb   (40 bit) // but why, here is also 40 bit.

And I have do another experience.
struct s
{
        unsigned long long a:2;
        unsigned long long b:40;
        unsigned long long c:22;
};

int main()
{
        struct s t = {1, 2, 3};
        unsigned long long a = t.a - 8;
        unsigned long long b = t.b - 8;
        unsigned long long c = t.c - 8;

        printf("0x%llx\n",a);
        printf("0x%llx\n",b);
        printf("0x%llx\n",c);
}

Tht output is :
0xfffffffffffffff9
0xfffffffffa
0xfffffffffffffffb

Could you please tell me the full name of DR #120 documents.
Thanks again.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41793