Re: [Linux-ia64] gettimeoffset for 2.5.67

From: David Mosberger <davidm_at_napali.hpl.hp.com>
Date: 2003-05-13 16:44:37
>>>>> On 12 May 2003 22:05:02 -0400, Jes Sorensen <jes@wildopensource.com> said:

  Jes> As for the instruction bundling, yes of course I checked that, how can
  Jes> you ask ;-) The patch results in a total of three nops before the
  Jes> branch, however no matter how I move it around, getting rid of those
  Jes> doesn't seem to be possible (feel free to challenge me on that one).

This:

+	and r2=IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT,r2
 	;;
+	cmp.ne p8, p0=0, r2
+(p8)	br.spnt.many fsys_fallback_syscall


can be shortened to:

	tbit.nz p8, p0=IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT_BIT, r2
(p8)	br.spnt.many fsys_fallback_syscall

Might make it a bit easier to schedule things around (just add foo_BIT
numbers for all the SAL_PLATFORM_FEATURE bits and then define the
masks in terms of these bit numbers).

Sorry I didn't catch this previously.

	--david
Received on Mon May 12 23:46:15 2003

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