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47  *	log(x)
50  *			     log(x)
51  *		log10(x) = ---------  or  [1/log(10)]*log(x)
52  *			    log(10)
55  *	  [log(10)]   rounded to 56 bits has error  .0895  ulps,
56  *	  [1/log(10)] rounded to 53 bits has error  .198   ulps;
58  *	  log(x) by log(10), but in IEEE Double format, we multiply
59  *	  log(x) by [1/log(10)].
99 	return(log(x)/ln10hi);
101 	return(ivln10*log(x));
112 	return(ivln10*log(x));