1/*
2 * Copyright (C) 2016 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "ArrayConventions.h"
28
29#include "JSCInlines.h"
30
31namespace JSC {
32
33#if USE(JSVALUE64)
34void clearArrayMemset(WriteBarrier<Unknown>* base, unsigned count)
35{
36 gcSafeZeroMemory(base, count * sizeof(WriteBarrier<Unknown>));
37}
38
39void clearArrayMemset(double* base, unsigned count)
40{
41#if CPU(X86_64) && COMPILER(GCC_COMPATIBLE)
42 uint64_t pnan = bitwise_cast<uint64_t>(PNaN);
43 asm volatile (
44 "rep stosq\n\t"
45 : "+D"(base), "+c"(count)
46 : "a"(pnan)
47 : "memory"
48 );
49#else // not CPU(X86_64)
50 // Oh no, we can't actually do any better than this!
51 for (unsigned i = count; i--;)
52 base[i] = PNaN;
53#endif // generic CPU
54}
55#endif // USE(JSVALUE64)
56
57} // namespace JSC
58
59