1/* $NetBSD: flt_rounds.c,v 1.5 2012/03/17 21:35:06 martin 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: flt_rounds.c,v 1.5 2012/03/17 21:35:06 martin Exp $"); 11#endif /* LIBC_SCCS and not lint */ 12 13#include <sys/types.h> 14#include <machine/float.h> 15 16static const int map[] = { 17 1, /* round to nearest */ 18 0, /* round to zero */ 19 2, /* round to positive infinity */ 20 3 /* round to negative infinity */ 21}; 22 23int 24__flt_rounds(void) 25{ 26 uint32_t x; 27 28 __asm("st %%fsr,%0" : "=m" (*&x)); 29 return map[(x >> 30) & 0x03]; 30} 31