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