Atan

Function Atan

The Atan function computes an inverse tangent 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	15.88	14.53	9.13
	LA	7.94	7.34	9.13
	EP	5.12	4.90	9.13
double	HA	36.99	31.88	13.52
	LA	36.98	31.88	13.31
	EP	36.96	31.88	13.31

Notes:
1) Units - CPE (Clocks per Element)
2) Performance was measured on "working" interval (double precision: [ 0.005 ; 0.99999 ]; single precision: [ 0.77 ; 0.99999 ])
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	0.78	0.78	0.50
	LA	2.43	2.43	0.50
	EP	2.00E+03	2.00E+03	0.50
double	HA	0.71	0.70	0.50
	LA	0.74	0.74	0.50
	EP	0.74	0.74	0.50

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

Performance Graphs:

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