1/* $NetBSD: fpsetround.c,v 1.8 2024/04/02 20:42:12 rillig 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 1.8 2024/04/02 20:42:12 rillig 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(fpsetround,_fpsetround) 19#endif 20 21fp_rnd 22fpsetround(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 &= ~(0x03U << 30); 31 new |= ((rnd_dir & 0x03U) << 30); 32 33 __asm("ld %0,%%fsr" : : "m" (*&new)); 34 35 return ((unsigned int)old >> 30) & 0x03; 36} 37