Re: [PATCH] stdlib: reorganize stdlib Makefile routines by functionality

[Florian Weimer <fweimer@redhat.com>]

* abush wang:

> This is test:
> ```
> uint64_t getnsecs() {
>     uint32_t lo, hi; 
>     __asm__ __volatile__ (
>         "rdtsc" : "=a"(lo), "=d"(hi)
>     );  
>     return ((uint64_t)hi << 32) | lo;
> }
>
> int main() {
>     const int num_iterations = 1;
>     uint64_t start, end, total_time = 0;
>
>     start = getnsecs();
>     for (int i = 0; i < num_iterations; i++) {
>         (void) lrand48();
>     }
>     end = getnsecs();
>     total_time += (end - start);
>
>     printf("Average time for lrand48: %lu cycles\n", total_time / num_iterations);
>     return 0;
> }
> ```
> before:
> Average time for lrand48: 21418 cycles
>
> after:
> Average time for lrand48: 9892 cycles

Do you see this on x86-64?  So this isn't a displacement range issue?

It could be that this is a random performance change due to code
alignment, and not actually caused by the direct call distance.

Thanks,
Florian