fpsetmask.c revision 1.2 
1/*	$OpenBSD: fpsetmask.c,v 1.2 2002/05/22 20:05:01 miod Exp $	*/
2
3/*
4 * Written by Miodrag Vallat.  Public domain
5 */
6
7#include <sys/types.h>
8#include <ieeefp.h>
9
10fp_except
11fpsetmask(mask)
12	fp_except mask;
13{
14	u_int32_t fpsr;
15	fp_rnd old;
16
17	__asm__ __volatile__("fstw %%fr0,0(%1)" : "=m"(fpsr) : "r"(&fpsr));
18	old = fpsr & 0x1f;
19	fpsr = (fpsr & 0xffffffe0) | (mask & 0x1f);
20	__asm__ __volatile__("fldw 0(%0),%%fr0" : : "r"(&fpsr));
21	return (old);
22}
23