1 /* $OpenBSD: flt_rounds.c,v 1.2 2006/11/14 09:51:25 otto Exp $ */ 2 /* 3 * Copyright (c) 2006 Miodrag Vallat. 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice, this permission notice, and the disclaimer below 8 * appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 #include <machine/float.h> 21 #include <machine/ieeefp.h> 22 23 static const int rndmap[] = { 24 1, /* round to nearest */ 25 0, /* round to zero */ 26 2, /* round to positive infinity */ 27 3 /* round to negative infinity */ 28 }; 29 30 int 31 __flt_rounds() 32 { 33 #if !defined(SOFTFLOAT) 34 register_t fpscr; 35 36 __asm__ __volatile__ ("sts fpscr, %0" : "=r" (fpscr)); 37 return rndmap[fpscr & 0x03]; 38 #else 39 return rndmap[fpgetround()]; 40 #endif 41 } 42