Log2
Computes the base 2 logarithm of vector elements.
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
|
3.56
|
3.63
|
3.04
|
1.17
|
LA
|
2.17
|
1.50
|
1.38
|
0.63
| |
EP
|
2.17
|
1.07
|
0.96
|
0.57
| |
double
|
HA
|
6.86
|
6.44
|
5.35
|
2.58
|
LA
|
6.12
|
5.45
|
4.71
|
2.11
| |
EP
|
5.22
|
5.06
|
4.34
|
1.68
| |
Notes:
- Units - CPE (Clocks per Element)
- Performance was measured on "working" interval (double precision: [ 0.1, 10000.0 ]; single precision: [ 0.1, 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
|
0.68
|
0.68
|
0.68
|
0.53
|
LA
|
2.08
|
2.08
|
2.08
|
2.12
| |
EP
|
893.54
|
893.54
|
893.54
|
30.16
| |
double
|
HA
|
0.50
|
0.50
|
0.50
|
0.52
|
LA
|
2.02
|
2.02
|
2.02
|
1.81
| |
EP
|
1.78E+06
|
1.78E+06
|
1.78E+06
|
2.78E+06
| |
Note:
Units - ULP (Units in the Last Place).Performance Graphs:
