flt_rounds.c revision 230191
1144513Simp/*- 2144513Simp * Copyright (c) 2012 Ian Lepore <freebsd@damnhippie.dyndns.org> 3144513Simp * All rights reserved. 4144513Simp * 5144513Simp * Redistribution and use in source and binary forms, with or without 6217157Stijl * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/lib/libc/arm/gen/flt_rounds.c 230191 2012-01-16 04:08:29Z das $"); 29 30#include <fenv.h> 31#include <float.h> 32 33#include "softfloat.h" 34 35int 36__flt_rounds(void) 37{ 38 39#ifndef ARM_HARD_FLOAT 40 /* 41 * Translate our rounding modes to the unnamed 42 * manifest constants required by C99 et. al. 43 */ 44 switch (__softfloat_float_rounding_mode) { 45 case FE_TOWARDZERO: 46 return (0); 47 case FE_TONEAREST: 48 return (1); 49 case FE_UPWARD: 50 return (2); 51 case FE_DOWNWARD: 52 return (3); 53 } 54 return (-1); 55#else /* ARM_HARD_FLOAT */ 56 /* 57 * Apparently, the rounding mode is specified as part of the 58 * instruction format on ARM, so the dynamic rounding mode is 59 * indeterminate. Some FPUs may differ. 60 */ 61 return (-1); 62#endif /* ARM_HARD_FLOAT */ 63} 64