Acos

Function Acos

The Acos function computes an inverse cosine of real vector elements.

Performance:

		Intel(R) Xeon(R) processor 5100 Series	45nm Intel(R) Core(TM)2 Duo Processor	Intel(R) Itanium(R) 2 processor
single	HA	15.79	16.10	10.22
	LA	8.93	7.32	10.22
	EP	6.92	6.94	10.22
double	HA	39.84	36.34	11.17
	LA	29.74	22.87	11.17
	EP	29.74	22.87	11.17

Notes:
1) Units - CPE (Clocks per Element)
2) Performance was measured on "working" interval (double precision: [ +1.001 ; +1.0e+154 ]; single precision: [ +4.0 ; +1.0e+19 ])
3) Data - vectors of 1000 elements with random generated numbers.

Accuracy:

		Intel(R) Xeon(R) processor 5100 Series	45nm Intel(R) Core(TM)2 Duo Processor	Intel(R) Itanium(R) 2 processor
single	HA	0.74	0.74	0.50
	LA	2.16	2.16	0.50
	EP	613.00	613.00	0.50
double	HA	0.70	0.70	0.50
	LA	3.11	3.11	0.50
	EP	3.11	3.11	0.50

Note: Units - ULP (Units in The Last Place).

Performance Graphs:

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