[Bug tree-optimization/53991] _mm_popcnt_u64 fails with -O3 -fgnu-tm

["andysem at mail dot ru" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53991

--- Comment #8 from andysem at mail dot ru ---
We have a similar problem in Boost.Atomic:

https://svn.boost.org/trac/boost/ticket/10204

There we mark all boost::atomic<> functions as always_inline to make sure the
compiler sees the memory order arguments as constants as opposed to runtime
values (otherwise the compiler just ignores memory order arguments and acts as
if seq_cst was specified).

As I understand, atomic intrinsics are transaction_unsafe, so should be
Boost.Atomic functions as well, yet we still want them always_inline. Given
this I don't quite understand the reason why a transaction_unsafe function
can't be inlined into the caller; the caller is unsafe anyway, isn't it?

Is there a solution for this problem on the source code level, except removing
always_inline?