Acos

Function Acos

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

Performance:

		Dual-Core Intel(R) Xeon(R) processor 5100 Series	45nm Intel(R) Core(TM)2 Duo processor	Intel(R) Itanium(R) 2 processor
single	HA	12.06	12.51	12.80
	LA	8.85	8.06	12.80
	EP	6.57	7.10	12.80
double	HA	21.28	18.38	11.02
	LA	12.38	17.00	11.02
	EP	12.38	17.00	11.02

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

Accuracy:

		Dual-Core Intel(R) Xeon(R) processor 5100 Series	45nm Intel(R) Core(TM)2 Duo processor	Intel(R) Itanium(R) 2 processor
single	HA	0.71	0.71	0.50
	LA	2.34	2.34	0.50
	EP	622.00	622.00	0.50
double	HA	0.71	0.71	0.50
	LA	2.87	2.87	0.50
	EP	2.87	2.87	0.50

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

Performance Graphs:

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