PERFORCE change 76008 for review
David Xu
davidxu at FreeBSD.org
Tue Apr 26 07:29:01 PDT 2005
http://perforce.freebsd.org/chv.cgi?CH=76008
Change 76008 by davidxu at davidxu_tiger on 2005/04/26 14:28:17
Eliminate a branch.
Affected files ...
.. //depot/projects/davidxu_thread/src/sys/i386/i386/sysenter.s#2 edit
Differences ...
==== //depot/projects/davidxu_thread/src/sys/i386/i386/sysenter.s#2 (text+ko) ====
@@ -28,7 +28,7 @@
MEXITCOUNT
movl PCPU(CURPCB),%eax
testl $PCB_FULLCTX,PCB_FLAGS(%eax)
- jnz 2f
+ jnz 1f
/*
* Check for ASTs atomically with returning. Disabling CPU
* interrupts provides sufficient locking even in the SMP case,
@@ -37,10 +37,7 @@
cli
movl PCPU(CURTHREAD),%eax
testl $TDF_ASTPENDING | TDF_NEEDRESCHED,TD_FLAGS(%eax)
- jz 1f
- sti
- jmp 2f
-1:
+ jnz 1f
.globl sysenter_popl_fs
sysenter_popl_fs:
popl %fs
@@ -68,6 +65,8 @@
#endif
sysexit
-2: /* Requested full context restore, use doreti for that */
+1:
+ /* Requested full context restore, use doreti for that */
+ sti
andq $~PCB_FULLCTX,PCB_FLAGS(%rax)
jmp doreti
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