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disabled checks for smp_active == 0.

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this was wasting precious cycles for no apparent (to me) reason.
it is currently bracketed by BOTHER_TO_CHECK, define to restore old behaviour.
This commit is contained in:
Steve Passe 1997-05-03 19:24:16 +00:00
parent 9999694073
commit 356b97e402
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=25423
1 changed files with 10 additions and 1 deletions
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11
sys/i386/i386/mplock.s
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@ -6,7 +6,7 @@
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ---------------------------------------------------------------------------- * ----------------------------------------------------------------------------
* *
* $Id: mplock.s,v 1.16 1997/04/26 06:41:33 peter Exp $ * $Id: mplock.s,v 1.1 1997/05/03 19:00:42 smp Exp smp $
* *
* Functions for locking between CPUs in a SMP system. * Functions for locking between CPUs in a SMP system.
* *
@ -37,11 +37,16 @@
* Destroys %eax, %ecx and %edx. * Destroys %eax, %ecx and %edx.
*/ */
/* XXX FIXME: remove this code entirely once it is proven unnecessary */
#define BOTHER_TO_CHECK_NOT
NON_GPROF_ENTRY(MPgetlock) NON_GPROF_ENTRY(MPgetlock)
#if defined(BOTHER_TO_CHECK)
movl _smp_active, %eax /* !MP ? -- skip it */ movl _smp_active, %eax /* !MP ? -- skip it */
cmpl $0, %eax cmpl $0, %eax
jne 1f jne 1f
ret ret
#endif /* BOTHER_TO_CHECK */
1: movl 4(%esp), %edx /* Get the address of the lock */ 1: movl 4(%esp), %edx /* Get the address of the lock */
movl (%edx), %eax /* Try to see if we have it already */ movl (%edx), %eax /* Try to see if we have it already */
andl $0x00ffffff, %eax /* - get count */ andl $0x00ffffff, %eax /* - get count */
@ -83,11 +88,13 @@ NON_GPROF_ENTRY(MPgetlock)
*/ */
NON_GPROF_ENTRY(MPtrylock) NON_GPROF_ENTRY(MPtrylock)
#if defined(BOTHER_TO_CHECK)
movl _smp_active, %eax /* !MP ? -- skip it */ movl _smp_active, %eax /* !MP ? -- skip it */
cmpl $0, %eax cmpl $0, %eax
jne 1f jne 1f
movl $1, %eax movl $1, %eax
ret ret
#endif /* BOTHER_TO_CHECK */
1: movl 4(%esp), %edx /* Get the address of the lock */ 1: movl 4(%esp), %edx /* Get the address of the lock */
movl (%edx), %eax /* Try to see if we have it already */ movl (%edx), %eax /* Try to see if we have it already */
andl $0x00ffffff, %eax /* - get count */ andl $0x00ffffff, %eax /* - get count */
@ -122,10 +129,12 @@ NON_GPROF_ENTRY(MPtrylock)
*/ */
NON_GPROF_ENTRY(MPrellock) NON_GPROF_ENTRY(MPrellock)
#if defined(BOTHER_TO_CHECK)
movl _smp_active, %eax /* !MP ? -- skip it */ movl _smp_active, %eax /* !MP ? -- skip it */
cmpl $0, %eax cmpl $0, %eax
jne 1f jne 1f
ret ret
#endif /* BOTHER_TO_CHECK */
1: movl 4(%esp), %edx /* Get the address of the lock */ 1: movl 4(%esp), %edx /* Get the address of the lock */
movl (%edx), %eax /* - get the value */ movl (%edx), %eax /* - get the value */
movl %eax,%ecx movl %eax,%ecx