/*      $OpenBSD: fpsetmask.c,v 1.6 2023/01/27 11:25:16 miod Exp $      */

/*
 * Written by Miodrag Vallat.  Public domain
 */

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

fp_except
fpsetmask(mask)
        fp_except mask;
{
        u_int64_t fpsr;
        fp_except old;

        __asm__ volatile("fstd %%fr0,0(%1)" : "=m"(fpsr) : "r"(&fpsr));
        old = (fpsr >> 32) & 0x1f;
        fpsr = (fpsr & 0xffffffe000000000LL) | ((u_int64_t)(mask & 0x1f) << 32);
        __asm__ volatile("fldd 0(%0),%%fr0" : : "r"(&fpsr), "m"(fpsr));
        return (old);
}