Atan2

Function Atan2

The Atan2 function computes a four-quadrant inverse tangent of vector elements of two real vectors.

Performance:

		Intel(R) Xeon(R) processor 5100 Series	45nm Intel(R) Core(TM)2 Duo Processor	Intel(R) Itanium(R) 2 processor
single	HA	36.29	33.43	12.95
	LA	14.37	14.05	12.33
	EP	11.02	11.65	12.33
double	HA	74.75	72.60	17.86
	LA	74.75	67.00	17.64
	EP	74.75	66.90	17.64

Notes:
1) Units - CPE (Clocks per Element)
2) Performance was measured on "working" interval (double precision: [-10000.0, +10000.0] for both arguments;
single precision: [-10000, +10000] for both arguments)
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	2.33	2.33	0.50
	EP	3.63E+03	3.63E+03	0.50
double	HA	0.73	0.73	0.50
	LA	0.73	0.73	0.50
	EP	0.73	0.73	0.50

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

Performance Graphs:

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