1 /** 2 University of Illinois/NCSA 3 Open Source License 4 5 Copyright (c) 2009-2014 by the contributors listed in CREDITS.TXT 6 7 All rights reserved. 8 9 Developed by: 10 11 LLVM Team 12 13 University of Illinois at Urbana-Champaign 14 15 http://llvm.org 16 17 Permission is hereby granted, free of charge, to any person obtaining a copy of 18 this software and associated documentation files (the "Software"), to deal with 19 the Software without restriction, including without limitation the rights to 20 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 21 of the Software, and to permit persons to whom the Software is furnished to do 22 so, 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 36 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 37 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS 38 FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 39 CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 40 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 41 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE 42 SOFTWARE. 43 **/ 44 45 #define DOUBLE_PRECISION 46 #include "fp_lib.h" 47 48 #include "int_lib.h" 49 50 ARM_EABI_FNALIAS(ui2d, floatunsidf) 51 52 COMPILER_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
