Hi Linaro Toolchain Group,

I am comparing execution time (run time) of sin() trigonometric function between following glibc (including libm) libraries for aarch64 (juno cortex a57) :

Linaro glibc 2.19, Linaro eglibc 2.19, eglibc 2.19 (from http://www.eglibc.org/) and Linaro glibc 2.21.

My observation for execution time of sin():

with Linaro glibc 2.19 and eglibc 2.19 = 1m24.703s (approx)

whereas,

with  Linaro eglibc 2.19 & Linaro glibc 2.21 = 0m25.243s (approx)

Has Linaro optimized the libm functions for aarch64 in Linaro eglibc 2.19 ?

If yes, please point me to relevant reference from where I can find more information on them.

Since the eglibc development from version 2.19 has stopped, will Linaro maintain its own development version of glibc ?

I am using below snippet code and linux 'time' command to calculate the time.

void sin_func(void)

{

        double incr = 0.732;

        double result, count = 0.0;

        printf("%s\n", __func__);

        while (count < 105414350.0) {

                result = sin(count);

                count += incr;

        }

}

Thanks.