1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2012 Ian Lepore <freebsd@damnhippie.dyndns.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <fenv.h> 30 #include <float.h> 31 32 #ifndef __ARM_PCS_VFP 33 #include "softfloat-for-gcc.h" 34 #include "milieu.h" 35 #include "softfloat.h" 36 #endif 37 38 int 39 __flt_rounds(void) 40 { 41 int mode; 42 43 #ifndef __ARM_PCS_VFP 44 /* 45 * Translate our rounding modes to the unnamed 46 * manifest constants required by C99 et. al. 47 */ 48 mode = __softfloat_float_rounding_mode; 49 #else /* __ARM_PCS_VFP */ 50 /* 51 * Read the floating-point status and control register 52 */ 53 __asm __volatile("vmrs %0, fpscr" : "=&r"(mode)); 54 mode &= _ROUND_MASK; 55 #endif /* __ARM_PCS_VFP */ 56 57 switch (mode) { 58 case FE_TOWARDZERO: 59 return (0); 60 case FE_TONEAREST: 61 return (1); 62 case FE_UPWARD: 63 return (2); 64 case FE_DOWNWARD: 65 return (3); 66 } 67 return (-1); 68 } 69