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floatunsisf_ieee754.c revision 1.1.8.2 
      1  1.1.8.2  tls /*	$NetBSD: floatunsisf_ieee754.c,v 1.1.8.2 2014/08/20 00:02:14 tls Exp $	*/
      2  1.1.8.2  tls 
      3  1.1.8.2  tls /*-
      4  1.1.8.2  tls  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  1.1.8.2  tls  * All rights reserved.
      6  1.1.8.2  tls  *
      7  1.1.8.2  tls  * This code is derived from software contributed to The NetBSD Foundation
      8  1.1.8.2  tls  * by Matt Thomas of 3am Software Foundry.
      9  1.1.8.2  tls  *
     10  1.1.8.2  tls  * Redistribution and use in source and binary forms, with or without
     11  1.1.8.2  tls  * modification, are permitted provided that the following conditions
     12  1.1.8.2  tls  * are met:
     13  1.1.8.2  tls  * 1. Redistributions of source code must retain the above copyright
     14  1.1.8.2  tls  *    notice, this list of conditions and the following disclaimer.
     15  1.1.8.2  tls  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.1.8.2  tls  *    notice, this list of conditions and the following disclaimer in the
     17  1.1.8.2  tls  *    documentation and/or other materials provided with the distribution.
     18  1.1.8.2  tls  *
     19  1.1.8.2  tls  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.1.8.2  tls  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.1.8.2  tls  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.1.8.2  tls  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.1.8.2  tls  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.1.8.2  tls  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.1.8.2  tls  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.1.8.2  tls  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.1.8.2  tls  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.1.8.2  tls  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.1.8.2  tls  * POSSIBILITY OF SUCH DAMAGE.
     30  1.1.8.2  tls  */
     31  1.1.8.2  tls 
     32  1.1.8.2  tls #include <sys/cdefs.h>
     33  1.1.8.2  tls #if defined(LIBC_SCCS) && !defined(lint)
     34  1.1.8.2  tls __RCSID("$NetBSD: floatunsisf_ieee754.c,v 1.1.8.2 2014/08/20 00:02:14 tls Exp $");
     35  1.1.8.2  tls #endif /* LIBC_SCCS and not lint */
     36  1.1.8.2  tls 
     37  1.1.8.2  tls #if defined(SOFTFLOAT) || defined(__ARM_EABI__)
     38  1.1.8.2  tls #include "softfloat/softfloat-for-gcc.h"
     39  1.1.8.2  tls #endif
     40  1.1.8.2  tls 
     41  1.1.8.2  tls #include <machine/ieee.h>
     42  1.1.8.2  tls 
     43  1.1.8.2  tls float __floatunsisf(uint32_t);
     44  1.1.8.2  tls 
     45  1.1.8.2  tls /*
     46  1.1.8.2  tls  * Convert (unsigned) int to float.
     47  1.1.8.2  tls  */
     48  1.1.8.2  tls float
     49  1.1.8.2  tls __floatunsisf(uint32_t x)
     50  1.1.8.2  tls {
     51  1.1.8.2  tls 	union ieee_single_u u;
     52  1.1.8.2  tls 
     53  1.1.8.2  tls 	if (x == 0)
     54  1.1.8.2  tls 		return 0.0;
     55  1.1.8.2  tls 	if (x == 1)
     56  1.1.8.2  tls 		return 1.0;
     57  1.1.8.2  tls 
     58  1.1.8.2  tls 	u_int l = __builtin_clz(x);
     59  1.1.8.2  tls 	x <<= (l + 1);	/* clear implicit bit */
     60  1.1.8.2  tls 
     61  1.1.8.2  tls 	u.sngu_sign = 0;
     62  1.1.8.2  tls 	u.sngu_exp = SNG_EXP_BIAS + 31 - l;
     63  1.1.8.2  tls 	u.sngu_frac = x >> (32 - SNG_FRACBITS);
     64  1.1.8.2  tls 
     65  1.1.8.2  tls 	return u.sngu_f;
     66  1.1.8.2  tls }
     67