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36 lines
1.4 KiB
C
36 lines
1.4 KiB
C
/* Copyright (C) 2011 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Provide a mask based on the pointer alignment that
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sets up non-zero bytes before the beginning of the string.
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The MASK expression works because shift counts are taken mod 64.
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Also, specify how to count "first" and "last" bits
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when the bits have been read as a word. */
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#ifndef __BIG_ENDIAN__
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#define MASK(x) (__insn_shl(1ULL, (x << 3)) - 1)
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#define NULMASK(x) ((2ULL << x) - 1)
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#define CFZ(x) __insn_ctz(x)
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#define REVCZ(x) __insn_clz(x)
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#else
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#define MASK(x) (__insn_shl(-2LL, ((-x << 3) - 1)))
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#define NULMASK(x) (-2LL << (63 - x))
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#define CFZ(x) __insn_clz(x)
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#define REVCZ(x) __insn_ctz(x)
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#endif
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