http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59968
--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to H.J. Lu from comment #0) > There are some BT patterns in i386 guarded with > TARGET_USE_BT. But there are no testcases to show > if they are used at all. testsuite/gcc.target/i386/bt-*.c > Also BT instructions supports memory destination. > But BT patterns only allow register destination. bt with a memory operand is slow. The bitpos argument is not limited to operand size, and is primarily used for locked memory access. BTW: $ objdump -d cc1 | grep "bt " | wc -l 1228
