fpsetmask.c revision 1.6 
1/*	$NetBSD: fpsetmask.c,v 1.6 2012/03/19 22:23:10 matt Exp $	*/
2
3/*
4 * Written by J.T. Conklin, Apr 11, 1995
5 * Public domain.
6 */
7
8#include <sys/cdefs.h>
9#if defined(LIBC_SCCS) && !defined(lint)
10__RCSID("$NetBSD: fpsetmask.c,v 1.6 2012/03/19 22:23:10 matt Exp $");
11#endif /* LIBC_SCCS and not lint */
12
13#include "namespace.h"
14
15#include <ieeefp.h>
16
17#ifdef __weak_alias
18__weak_alias(fpsetmask,_fpsetmask)
19#endif
20
21fp_except
22fpsetmask(fp_except mask)
23{
24	fp_except old;
25	fp_except new;
26
27	__asm("cfc1 %0,$31" : "=r" (old));
28
29	new = old & ~(0x1f << 7);
30	new |= ((mask & 0x1f) << 7);
31
32	__asm("ctc1 %0,$31" : : "r" (new));
33
34	return (old >> 7) & 0x1f;
35}
36