github.com/afumu/libc@v0.0.6/musl/src/math/aarch64/llround.c (about)

     1  #include <math.h>
     2  
     3  long long llround(double x)
     4  {
     5  	long long n;
     6  	__asm__ ("fcvtas %x0, %d1" : "=r"(n) : "w"(x));
     7  	return n;
     8  }