mailing list of musl libc

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 #include <math.h>

#if __riscv_flen >= 32

float roundf(float x)
{
	if (!isfinite(x)) return x;
	float tmp;
	long n;
	__asm__ ("fcvt.w.s %0, %1, rmm" : "=r"(n) : "f"(x));
	__asm__ ("fcvt.s.w %0, %1" : "=f"(tmp) : "r"(n));
	__asm__ ("fsgnj.s %0, %1, %2" : "=f"(x) : "f"(tmp), "f"(x));
	return x;
}

#else

#include "../roundf.c"

#endif