Module Name:	syssrc
Committed By:	thorpej
Date:		Fri Dec  3 07:29:59 UTC 1999

Modified Files:
	syssrc/sys/arch/alpha/alpha: machdep.c

Log Message:
New delay(), more carefully coded:
- Use explicit assembly; don't want the compiler optimizing things too
  much here.
- Subtract 2 for each iteration of the loop, rather than 3.  The loop
  consists of only 2 instructions (even the C version compiled to a
  loop of 2 instructions).

The latter change has squashed a fairly annoying timing bug in the
mii_bitbang module as used by the `ex' driver on my AlphaStation 500.

XXX delay() should maybe be rewritten again, to use the rpcc instruction.


To generate a diff of this commit:
cvs rdiff -r1.185 -r1.186 syssrc/sys/arch/alpha/alpha/machdep.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.