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/*
* University of Illinois/NCSA Open Source License
*
* Copyright (c) 2003-2012 University of Illinois at Urbana-Champaign.
* All rights reserved.
*
* Developed by:
*
* LLVM Team
*
* University of Illinois at Urbana-Champaign
*
* http://llvm.org
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* with the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimers.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimers in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the names of the LLVM Team, University of Illinois at
* Urbana-Champaign, nor the names of its contributors may be used to
* endorse or promote products derived from this Software without specific
* prior written permission.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH
* THE SOFTWARE.
*/
/*
* C compiler runtime logic for __ctzdi2() related builtins taken from LLVM.
*/
#include <sys/isa_defs.h>
#include <limits.h>
typedef union {
long long all;
struct {
#ifdef _LITTLE_ENDIAN
unsigned low;
int high;
#else
int high;
unsigned low;
#endif /* _LITTLE_ENDIAN */
} s;
} dwords;
int
__ctzdi2(unsigned long long val)
{
dwords x;
x.all = val;
const int f = -(x.s.low == 0);
return (__builtin_ctz((x.s.high & f) | (x.s.low & ~f)) +
(f & ((int)(sizeof (int) * CHAR_BIT))));
}
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