mirror of
https://github.com/libretro/scummvm.git
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74 lines
1.9 KiB
C++
74 lines
1.9 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it 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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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "common/memory.h"
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#include "common/util.h"
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namespace Common {
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void memset64(uint64 *dst, uint64 val, size_t count) {
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if (!count)
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return;
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int n = (count + 7) >> 3;
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switch (count % 8) {
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default:
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case 0: do {
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*dst++ = val; // fall through
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case 7: *dst++ = val; // fall through
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case 6: *dst++ = val; // fall through
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case 5: *dst++ = val; // fall through
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case 4: *dst++ = val; // fall through
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case 3: *dst++ = val; // fall through
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case 2: *dst++ = val; // fall through
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case 1: *dst++ = val;
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} while (--n > 0);
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}
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}
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void memset32(uint32 *dst, uint32 val, size_t count) {
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if (!IS_ALIGNED(dst, 8) && count) {
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*dst++ = val;
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count -= 1;
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}
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memset64((uint64 *)dst, val | ((uint64)val << 32), count >> 1);
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if (count & 1) {
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dst[count & ~1] = val;
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}
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}
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void memset16(uint16 *dst, uint16 val, size_t count) {
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if (!IS_ALIGNED(dst, 4) && count) {
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*dst++ = val;
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count -= 1;
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}
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memset32((uint32 *)dst, val | ((uint32)val << 16), count >> 1);
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if (count & 1) {
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dst[count & ~1] = val;
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}
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}
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} // End of namespace Common
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