mailing list of musl libc

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 #include <math.h>

#if __riscv_flen >= 64

double round(double x)
{
	if (isnan(x)) return x;
	if (fabs(x) >= 0x1p54) return x;
	double tmp;
	long long n;
	__asm__ ("fcvt.l.d %0, %1, rmm" : "=r"(n) : "f"(x));
	__asm__ ("fcvt.d.l %0, %1" : "=f"(tmp) : "r"(n));
	__asm__ ("fsgnj.d %0, %1, %2" : "=f"(x) : "f"(tmp), "f"(x));
	return x;
}

#else

#include "../round.c"

#endif