Author: jhb
Date: Thu Jul 29 18:44:10 2010
New Revision: 210623
URL: http://svn.freebsd.org/changeset/base/210623
Log:
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.
Submitted by: zec (i386)
MFC after: 1 week
Modified:
head/sys/amd64/include/pcpu.h
head/sys/i386/include/pcpu.h
head/sys/ia64/include/pcpu.h
Modified: head/sys/amd64/include/pcpu.h
==============================================================================
--- head/sys/amd64/include/pcpu.h Thu Jul 29 18:02:57 2010
(r210622)
+++ head/sys/amd64/include/pcpu.h Thu Jul 29 18:44:10 2010
(r210623)
@@ -216,12 +216,12 @@ 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: head/sys/i386/include/pcpu.h
==============================================================================
--- head/sys/i386/include/pcpu.h Thu Jul 29 18:02:57 2010
(r210622)
+++ head/sys/i386/include/pcpu.h Thu Jul 29 18:44:10 2010
(r210623)
@@ -223,12 +223,12 @@ 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())
Modified: head/sys/ia64/include/pcpu.h
==============================================================================
--- head/sys/ia64/include/pcpu.h Thu Jul 29 18:02:57 2010
(r210622)
+++ head/sys/ia64/include/pcpu.h Thu Jul 29 18:44:10 2010
(r210623)
@@ -70,12 +70,12 @@ struct pcpu;
register struct pcpu *pcpup __asm__("r13");
-static __inline struct thread *
+static __inline __pure2 struct thread *
__curthread(void)
{
struct thread *td;
- __asm __volatile("ld8.acq %0=[r13]" : "=r"(td));
+ __asm("ld8.acq %0=[r13]" : "=r"(td));
return (td);
}
#define curthread (__curthread())
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