svn commit: r210902 - in stable/7/sys: amd64/include i386/include
John Baldwin
jhb at FreeBSD.org
Thu Aug 5 22:04:08 UTC 2010
Author: jhb
Date: Thu Aug 5 22:04:07 2010
New Revision: 210902
URL: http://svn.freebsd.org/changeset/base/210902
Log:
MFC 210623:
Mark the __curthread() functions as __pure2 and remove the volatile keyword
from the inline assembly. This allows the compiler to cache invocations of
curthread since it's value does not change within a thread context.
Modified:
stable/7/sys/amd64/include/pcpu.h
stable/7/sys/i386/include/pcpu.h
Directory Properties:
stable/7/sys/ (props changed)
stable/7/sys/cddl/contrib/opensolaris/ (props changed)
stable/7/sys/contrib/dev/acpica/ (props changed)
stable/7/sys/contrib/pf/ (props changed)
Modified: stable/7/sys/amd64/include/pcpu.h
==============================================================================
--- stable/7/sys/amd64/include/pcpu.h Thu Aug 5 22:01:14 2010 (r210901)
+++ stable/7/sys/amd64/include/pcpu.h Thu Aug 5 22:04:07 2010 (r210902)
@@ -188,12 +188,12 @@ extern struct pcpu *pcpup;
#define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
#define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
-static __inline struct thread *
+static __inline __pure2 struct thread *
__curthread(void)
{
struct thread *td;
- __asm __volatile("movq %%gs:0,%0" : "=r" (td));
+ __asm("movq %%gs:0,%0" : "=r" (td));
return (td);
}
#define curthread (__curthread())
Modified: stable/7/sys/i386/include/pcpu.h
==============================================================================
--- stable/7/sys/i386/include/pcpu.h Thu Aug 5 22:01:14 2010 (r210901)
+++ stable/7/sys/i386/include/pcpu.h Thu Aug 5 22:04:07 2010 (r210902)
@@ -189,12 +189,12 @@ extern struct pcpu *pcpup;
#define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
#define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
-static __inline struct thread *
+static __inline __pure2 struct thread *
__curthread(void)
{
struct thread *td;
- __asm __volatile("movl %%fs:0,%0" : "=r" (td));
+ __asm("movl %%fs:0,%0" : "=r" (td));
return (td);
}
#define curthread (__curthread())
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