Samuel Thibault
2008-Jan-17 13:29 UTC
[Xen-devel] [PATCH] [Mini-OS] Optimize IA64''s get_current()
Let gcc access r13 itself, leading to better code
Signed-off-by: Samuel Thibault <samuel.thibault@citrix.com>
diff -r a66bdc82d8fa extras/mini-os/include/ia64/arch_sched.h
--- a/extras/mini-os/include/ia64/arch_sched.h Wed Jan 16 11:44:41 2008 +0000
+++ b/extras/mini-os/include/ia64/arch_sched.h Thu Jan 17 12:29:01 2008 +0000
@@ -82,8 +82,7 @@ void arch_switch_threads(struct thread*
static inline struct thread* get_current(void)
{
- struct thread *current;
- __asm ("mov %0=r13" : "=r" (current));
+ register struct thread *current asm("r13");
return current;
}
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