Developer Reference
Visible to Intel only — GUID: GUID-3B9198EA-8942-4A69-AE96-64BB03270C8E
Logb
Computes the exponents of the elements of input vector a.
Performance:
Intel® Xeon® Processor E5-2680 | Intel® Xeon® Processor E5-2699 v3 | Intel® Xeon® Processor E5-2699 v4 | Intel® Xeon® Gold 6148 Processor | ||
---|---|---|---|---|---|
single | HA | 0.89 | 0.53 | 0.41 | 0.38 |
LA | 0.89 | 0.53 | 0.40 | 0.38 | |
EP | 0.89 | 0.53 | 0.40 | 0.38 | |
double | HA | 3.89 | 1.03 | 0.80 | 0.71 |
LA | 1.34 | 1.03 | 0.80 | 0.71 | |
EP | 1.34 | 1.03 | 0.80 | 0.71 |
Notes:
- Units - CPE (Clocks per Element)
Performance was measured on "working" interval (double precision: [ -10000.0, 10000.0 ]; single precision: [ -10000.0, 10000.0 ])
Data - vectors of 1000 elements with random generated numbers.
All data was collected with 64-bit libraries.
Accuracy:
Intel® Xeon® Processor E5-2680 | Intel® Xeon® Processor E5-2699 v3 | Intel® Xeon® Processor E5-2699 v4 | Intel® Xeon® Gold 6148 Processor | ||
---|---|---|---|---|---|
single | HA | 0.00 | 0.00 | 0.00 | 0.00 |
LA | 0.00 | 0.00 | 0.00 | 0.00 | |
EP | 0.00 | 0.00 | 0.00 | 0.00 | |
double | HA | 0.00 | 0.00 | 0.00 | 0.00 |
LA | 0.00 | 0.00 | 0.00 | 0.00 | |
EP | 0.00 | 0.00 | 0.00 | 0.00 |
NOTE:
Units - ULP (Units in the Last Place).
Performance Graphs:
Parent topic: Logarithmic