1/**
2University of Illinois/NCSA
3Open Source License
4
5Copyright (c) 2009-2014 by the contributors listed in CREDITS.TXT
6
7All rights reserved.
8
9Developed by:
10
11    LLVM Team
12
13    University of Illinois at Urbana-Champaign
14
15    http://llvm.org
16
17Permission is hereby granted, free of charge, to any person obtaining a copy of
18this software and associated documentation files (the "Software"), to deal with
19the Software without restriction, including without limitation the rights to
20use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
21of the Software, and to permit persons to whom the Software is furnished to do
22so, subject to the following conditions:
23
24    * Redistributions of source code must retain the above copyright notice,
25      this list of conditions and the following disclaimers.
26
27    * Redistributions in binary form must reproduce the above copyright notice,
28      this list of conditions and the following disclaimers in the
29      documentation and/or other materials provided with the distribution.
30
31    * Neither the names of the LLVM Team, University of Illinois at
32      Urbana-Champaign, nor the names of its contributors may be used to
33      endorse or promote products derived from this Software without specific
34      prior written permission.
35
36THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
37IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
38FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
39CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
40LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
41OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
42SOFTWARE.
43**/
44
45#define DOUBLE_PRECISION
46#include "fp_lib.h"
47
48#include "int_lib.h"
49
50ARM_EABI_FNALIAS(ui2d, floatunsidf)
51
52COMPILER_RT_ABI fp_t
53__floatunsidf(unsigned int a) {
54
55    const int aWidth = sizeof a * CHAR_BIT;
56
57    // Handle zero as a special case to protect clz
58    if (a == 0) return fromRep(0);
59
60    // Exponent of (fp_t)a is the width of abs(a).
61    const int exponent = (aWidth - 1) - __builtin_clz(a);
62    rep_t result;
63
64    // Shift a into the significand field and clear the implicit bit.
65    const int shift = significandBits - exponent;
66    result = (rep_t)a << shift ^ implicitBit;
67
68    // Insert the exponent
69    result += (rep_t)(exponent + exponentBias) << significandBits;
70    return fromRep(result);
71}
72