d799c02832
Provide missing functionality by using files from LLVM. Changes made: - Formatting changes (tabs to spaces, DOS line endings etc). - Simplified 'int_endianness.h' to work for our case. - Added LLVM licence to the individual files. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Harry Liebel <Harry.Liebel@arm.com> Reviewed-by: Olivier Martin <Olivier.Martin@arm.com> Reviewed-by: Daryl McDaniel <edk2-lists@mc2research.org> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18117 6f19259b-4bc3-4df7-8a09-765794883524
72 lines
2.5 KiB
C
72 lines
2.5 KiB
C
/**
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University of Illinois/NCSA
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Open Source License
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Copyright (c) 2009-2014 by the contributors listed in CREDITS.TXT
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All rights reserved.
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Developed by:
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LLVM Team
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University of Illinois at Urbana-Champaign
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http://llvm.org
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal with
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimers.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimers in the
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documentation and/or other materials provided with the distribution.
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* Neither the names of the LLVM Team, University of Illinois at
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Urbana-Champaign, nor the names of its contributors may be used to
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endorse or promote products derived from this Software without specific
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prior written permission.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
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SOFTWARE.
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**/
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#define DOUBLE_PRECISION
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#include "fp_lib.h"
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#include "int_lib.h"
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ARM_EABI_FNALIAS(ui2d, floatunsidf)
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COMPILER_RT_ABI fp_t
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__floatunsidf(unsigned int a) {
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const int aWidth = sizeof a * CHAR_BIT;
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// Handle zero as a special case to protect clz
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if (a == 0) return fromRep(0);
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// Exponent of (fp_t)a is the width of abs(a).
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const int exponent = (aWidth - 1) - __builtin_clz(a);
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rep_t result;
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// Shift a into the significand field and clear the implicit bit.
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const int shift = significandBits - exponent;
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result = (rep_t)a << shift ^ implicitBit;
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// Insert the exponent
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result += (rep_t)(exponent + exponentBias) << significandBits;
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return fromRep(result);
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}
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