74 lines
1.9 KiB
C++
74 lines
1.9 KiB
C++
/* Copyright (C) 2009, 2011 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@redhat.com>.
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This file is part of the GNU Transactional Memory Library (libitm).
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Libitm is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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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 "libitm_i.h"
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namespace GTM HIDDEN {
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uint32_t const gtm_bit_to_byte_mask[16] =
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{
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0x00000000,
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0x000000ff,
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0x0000ff00,
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0x0000ffff,
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0x00ff0000,
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0x00ff00ff,
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0x00ffff00,
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0x00ffffff,
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0xff000000,
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0xff0000ff,
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0xff00ff00,
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0xff00ffff,
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0xffff0000,
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0xffff00ff,
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0xffffff00,
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0xffffffff
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};
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#ifdef __SSE2__
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# define MEMBER m128i
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#else
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# define MEMBER w
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#endif
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void
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gtm_cacheline::copy_mask (gtm_cacheline * __restrict d,
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const gtm_cacheline * __restrict s,
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gtm_cacheline_mask m)
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{
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if (m == (gtm_cacheline_mask)-1)
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{
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*d = *s;
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return;
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}
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if (__builtin_expect (m == 0, 0))
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return;
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size_t n = sizeof(d->MEMBER[0]);
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for (size_t i = 0; i < CACHELINE_SIZE / n; ++i, m >>= n)
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store_mask (&d->MEMBER[i], s->MEMBER[i], m);
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}
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} // namespace GTM
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