tree 41504d1ba4f94282d109224936ae6829109c3e6d
parent 3c79c8b1d92a9ae3edf3cbcd2c43c553ee0f1d83
author David Mosberger-Tang <davidm@hpl.hp.com> 1114661767 -0700
committer Tony Luck <tony.luck@intel.com> 1114661767 -0700

[IA64] On return from syscall, hint b7 with __kernel_syscall_via_epc().

Why is this a good idea?  Clearing b7 to 0 is guaranteed to do us no
good and writing it with __kernel_syscall_via_epc() yields a 6 cycle
improvement _if_ the application performs another EPC-based system-
call without overwriting b7, which is not all that uncommon.  Well
worth the minimal cost of 1 bundle of code.

Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>