mirror of https://github.com/acidanthera/audk.git
75 lines
2.7 KiB
C
75 lines
2.7 KiB
C
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/**
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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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#include "int_lib.h"
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/* Returns: convert a to a unsigned int, rounding toward zero.
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* Negative values all become zero.
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*/
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/* Assumption: double is a IEEE 64 bit floating point type
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* su_int is a 32 bit integral type
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* value in double is representable in su_int or is negative
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* (no range checking performed)
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*/
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/* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */
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ARM_EABI_FNALIAS(d2uiz, fixunsdfsi)
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COMPILER_RT_ABI su_int
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__fixunsdfsi(double a)
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{
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double_bits fb;
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fb.f = a;
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int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023;
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if (e < 0 || (fb.u.s.high & 0x80000000))
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return 0;
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return (
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0x80000000u |
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((fb.u.s.high & 0x000FFFFF) << 11) |
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(fb.u.s.low >> 21)
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) >> (31 - e);
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}
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