Atan

Function Atan

The Atan function computes an inverse tangent 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	11.03	12.86	12.73
	LA	7.53	8.08	12.24
	EP	5.94	5.11	12.18
double	HA	14.10	18.73	14.33
	LA	14.10	18.73	14.11
	EP	14.10	14.08	14.07

Notes:
1) Units - CPE (Clocks per Element)
2) Performance was measured on "working" interval (double precision: [ -5, 5 ]; single precision: [ -5, 5 ])
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	2.35	2.35	0.50
	EP	2.42E+03	2.42E+03	0.50
double	HA	0.71	0.71	0.50
	LA	0.71	0.71	0.50
	EP	9.65E+06	9.65E+06	0.50

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

Performance Graphs:

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