[Bug c/43406] __builtin_popcountll fails with -O0 and -mpopcnt

[rbarreira at gmail dot com]

------- Comment #1 from rbarreira at gmail dot com  2010-03-17 16:35 -------
Note that if you use scanf ("%llx", &a) and input "ffffffffffff" instead of
having a hardcoded value for a, the bug happens both with -O3 and -O0.

To sum up it seems that when the popcnt instruction is actually issued, it's
using a 32-bit instruction instead of 64-bit.


-- 

rbarreira at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|__builtin_popcountll fails  |__builtin_popcountll fails
                   |with -O0 and -mpopcnt       |with -O0 and -mpopcnt


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43406