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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