SMS parameters

[Nathan Sidwell]

The following sms parameters exist.

max-sms-loop-number
sms-max-ii-factor
sms-dfa-history
sms-loop-average-count-threshold

None of these are documented in invoke.texi.

The first one is odd, as its help string says,
   "Maximum number of loops to perform swing modulo scheduling on \
	  (mainly for debugging)"
and its implementation is via a static counter that counts bbs in a *program*

   static int passes = 0;
   ...
   FOR_EACH_BB (bb)
      ...
      /* For debugging.  */
      if ((passes++ > MAX_SMS_LOOP_NUMBER) && (MAX_SMS_LOOP_NUMBER != -1))

it doesn't look like a particularly sensible thing to expose.  If
it must be exposed, it should probably be called 'sms-max-loop-number'.
Notice the fence-post error there, we'll actually schedule 1 more
than MAX_SMS_LOOP_NUMBER.

nathan
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