[Bug target/59968] Unused BT patterns

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59968

--- Comment #17 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 31974
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31974&action=edit
A micro-benchmark for BTS with register

BTS with register operand is about 7-20% faster on Silvermont
an Haswell.