1 /* $NetBSD: fpsetround.c,v 1.6 2012/03/21 00:38:35 christos Exp $ */ 2 3 /* 4 * Written by J.T. Conklin, Apr 10, 1995 5 * Public domain. 6 */ 7 8 #include <sys/cdefs.h> 9 #if defined(LIBC_SCCS) && !defined(lint) 10 __RCSID("$NetBSD: fpsetround.c,v 1.6 2012/03/21 00:38:35 christos Exp $"); 11 #endif /* LIBC_SCCS and not lint */ 12 13 #include "namespace.h" 14 15 #include <ieeefp.h> 16 17 #ifdef __weak_alias __weak_alias(fpsetround,_fpsetround)18__weak_alias(fpsetround,_fpsetround) 19 #endif 20 21 fp_rnd 22 fpsetround(fp_rnd rnd_dir) 23 { 24 fp_rnd old; 25 fp_rnd new; 26 27 __asm("st %%fsr,%0" : "=m" (*&old)); 28 29 new = old; 30 new &= ~(0x03 << 30); 31 new |= ((rnd_dir & 0x03) << 30); 32 33 __asm("ld %0,%%fsr" : : "m" (*&new)); 34 35 return ((unsigned int)old >> 30) & 0x03; 36 } 37