1 /* $OpenBSD: fixsfdi.c,v 1.1 2022/09/03 08:26:05 mbuhl Exp $ */ 2 /* $NetBSD: fixsfdi_ieee754.c,v 1.1 2013/08/24 00:51:48 matt Exp $ */ 3 4 /*- 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This software was developed by the Computer Systems Engineering group 9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 10 * contributed to Berkeley. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 #if defined(LIBC_SCCS) && !defined(lint) 39 __RCSID("$NetBSD: fixsfdi_ieee754.c,v 1.1 2013/08/24 00:51:48 matt Exp $"); 40 #endif /* LIBC_SCCS and not lint */ 41 42 #if defined(SOFTFLOAT) || defined(__ARM_EABI__) 43 #include "softfloat/softfloat-for-gcc.h" 44 #endif 45 46 #include "../../../quad/quad.h" 47 #include <limits.h> 48 #include <stdbool.h> 49 #include <machine/ieee.h> 50 51 /* 52 * Convert float to signed quad. 53 */ 54 quad_t 55 __fixsfdi(float x) 56 { 57 struct ieee_single ux = *(struct ieee_single *)&x; 58 signed int exp = ux.sng_exp - SNG_EXP_BIAS; 59 const bool neg = ux.sng_sign; 60 quad_t r; 61 62 if (exp < 0) 63 return 0; 64 if (exp > 62) 65 return neg ? QUAD_MIN : QUAD_MAX; 66 67 r = 1 << SNG_FRACBITS; /* implicit bit */ 68 r |= ux.sng_frac; 69 exp -= SNG_FRACBITS; 70 if (exp < 0) { 71 r >>= -exp; 72 } else if (exp > 0) { 73 r <<= exp; 74 } 75 return neg ? -r : r; 76 } 77