/*      $OpenBSD: e_sqrtf.c,v 1.3 2016/09/12 19:47:02 guenther Exp $    */

/*
 * Written by Martynas Venckus.  Public domain
 */

#include <sys/types.h>
#include <math.h>

#define FPSCR_PR        (1 << 19)

float
sqrtf(float f)
{
        register_t fpscr, nfpscr;

        __asm__ volatile ("sts fpscr, %0" : "=r" (fpscr));

        /* Set floating-point mode to single-precision. */
        nfpscr = fpscr & ~FPSCR_PR;

        __asm__ volatile ("lds %0, fpscr" : : "r" (nfpscr));
        __asm__ volatile ("fsqrt %0" : "+f" (f));

        /* Restore fp status/control register. */
        __asm__ volatile ("lds %0, fpscr" : : "r" (fpscr));

        return (f);
}
DEF_STD(sqrtf);