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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