Test new fmod function.
| Test type (i5) | dummy (spb) | libm (spb) | new (spb) | ratio libm/new |
|---|---|---|---|---|
| main | 4.72 | 1420.81 | 499.61 | 2.86 |
| 2*pi wrap | 8.82 | 17.71 | 17.09 | 1.07 |
| fractional part | 7 | 42.68 | 27.5 | 1.74 |
| extreme | 4.93 | 10394.9 | 570.71 | 18.36 |
| Test type (PI 4) | dummy (spb) | libm (spb) | new (spb) | ratio libm/new |
|---|---|---|---|---|
| main | 11.95 | 2085.13 | 234.31 | 9.32 |
| 2*pi wrap | 18.7 | 31.5 | 27.25 | 1.50 |
| fractional part | 18.7 | 76.17 | 33.06 | 4.00 |
| extreme | 12.06 | 13150.41 | 584.27 | 22.96 |
| Test type (AMD A8) | dummy (spb) | libm (spb) | new (spb) | ratio libm/new |
|---|---|---|---|---|
| main | 10.618 | 1389.659 | 199.114 | 7.32 |
| 2 *pi wrap | 12.17 | 25.326 | 20.727 | 1.54 |
| fractional part | 12.109 | 58.972 | 28.962 | 2.78 |
| extreme | 112.199 | 8346.179 | 732.643 | 13.27 |
Performance comparison table System GNU gcc 10 from Ubuntu 20.04 64bit:
- i5: Intel(R) Core(TM) i5-6300HQ
- PI4 : Raspberry PI 4 4GB
- AMD A8 : AMD A8-5600K
Calculation functions:
- dummy: dummy function call for loop time itself
- libm: libm fmod function
- new : proposed new fmod function
Data:
- spb : second per billion iterations (fmod calls). Lower better.
- ratio : (libm-dummy)/(new-dummy). Higher better new function performance.
Cases:
- main : All range of exponential part in double, random mantissa and all range of CLZ and CTZ.
- 2*pi wrap :
fmod(x, 2 * M_PI)x = [-4pi,4pi] - fractional part :
fmod(x, 1.0)x = [-1E6,1E6] - extreme :
fmod(x, y)where x ~ 1.1e+300, y ~ 1e-320