139 lines
2.4 KiB
C
139 lines
2.4 KiB
C
/* Implementation of the bit intrinsics not implemented as GCC builtins.
|
|
Copyright (C) 2009-2015 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU Fortran runtime library (libgfortran).
|
|
|
|
Libgfortran is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 3 of the License, or (at your option) any later version.
|
|
|
|
Libgfortran is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include "libgfortran.h"
|
|
|
|
|
|
#ifdef HAVE_GFC_INTEGER_16
|
|
extern int clz128 (GFC_INTEGER_16);
|
|
export_proto(clz128);
|
|
|
|
int
|
|
clz128 (GFC_INTEGER_16 x)
|
|
{
|
|
int res = 127;
|
|
|
|
// We can't write 0xFFFFFFFFFFFFFFFF0000000000000000, so we work around it
|
|
if (x & ((__uint128_t) 0xFFFFFFFFFFFFFFFF << 64))
|
|
{
|
|
res -= 64;
|
|
x >>= 64;
|
|
}
|
|
|
|
if (x & 0xFFFFFFFF00000000)
|
|
{
|
|
res -= 32;
|
|
x >>= 32;
|
|
}
|
|
|
|
if (x & 0xFFFF0000)
|
|
{
|
|
res -= 16;
|
|
x >>= 16;
|
|
}
|
|
|
|
if (x & 0xFF00)
|
|
{
|
|
res -= 8;
|
|
x >>= 8;
|
|
}
|
|
|
|
if (x & 0xF0)
|
|
{
|
|
res -= 4;
|
|
x >>= 4;
|
|
}
|
|
|
|
if (x & 0xC)
|
|
{
|
|
res -= 2;
|
|
x >>= 2;
|
|
}
|
|
|
|
if (x & 0x2)
|
|
{
|
|
res -= 1;
|
|
x >>= 1;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef HAVE_GFC_INTEGER_16
|
|
extern int ctz128 (GFC_INTEGER_16);
|
|
export_proto(ctz128);
|
|
|
|
int
|
|
ctz128 (GFC_INTEGER_16 x)
|
|
{
|
|
int res = 0;
|
|
|
|
if ((x & 0xFFFFFFFFFFFFFFFF) == 0)
|
|
{
|
|
res += 64;
|
|
x >>= 64;
|
|
}
|
|
|
|
if ((x & 0xFFFFFFFF) == 0)
|
|
{
|
|
res += 32;
|
|
x >>= 32;
|
|
}
|
|
|
|
if ((x & 0xFFFF) == 0)
|
|
{
|
|
res += 16;
|
|
x >>= 16;
|
|
}
|
|
|
|
if ((x & 0xFF) == 0)
|
|
{
|
|
res += 8;
|
|
x >>= 8;
|
|
}
|
|
|
|
if ((x & 0xF) == 0)
|
|
{
|
|
res += 4;
|
|
x >>= 4;
|
|
}
|
|
|
|
if ((x & 0x3) == 0)
|
|
{
|
|
res += 2;
|
|
x >>= 2;
|
|
}
|
|
|
|
if ((x & 0x1) == 0)
|
|
{
|
|
res += 1;
|
|
x >>= 1;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
#endif
|