[Bug c++/23807] New: Mixed-type arithmetic error

["igodard at pacbell dot net" <gcc-bugzilla@gcc.gnu.org>]

#include    <iostream>

int main () {
    unsigned short us = ~0;
    unsigned int ui = 1;
    unsigned int res = ui + us;
    std::cerr << "res: " << res << ", ui: " << ui << ", us: 0x"
        << std::hex << us << "\n";
    res = 1;
    res = res + us;
    std::cerr << "res: " << res << ", ui: " << ui << ", us: 0x"
        << std::hex << us << "\n";
    return 0;
    }


gets you:

~/ootbc/members/src$ g++ foo.cc
~/ootbc/members/src$ a.out
res: 65536, ui: 1, us: 0xffff
res: 10000, ui: 1, us: 0xffff


Compiler:
~/ootbc/members/src$ gcc -v
Reading specs from /mnt/export/local/bin/../lib/gcc/i686-pc-linux-gnu/3.4.0/specs
Configured with: ../gcc/configure --prefix=/site
Thread model: posix
gcc version 3.4.0

Appears to be an optimization error, and non-update (first) version gives
correct result.

-- 
           Summary: Mixed-type arithmetic error
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: igodard at pacbell dot net
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23807