/* * Copyright (C) 2016 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include "ArrayConventions.h" #include "JSCInlines.h" namespace JSC { #if USE(JSVALUE64) void clearArrayMemset(WriteBarrier<Unknown>* base, unsigned count) { #if CPU(X86_64) && COMPILER(GCC_COMPATIBLE) uint64_t zero = 0; asm volatile ( "rep stosq\n\t" : "+D"(base), "+c"(count) : "a"(zero) : "memory" ); #else // not CPU(X86_64) memset(base, 0, count * sizeof(WriteBarrier<Unknown>)); #endif // generic CPU } void clearArrayMemset(double* base, unsigned count) { #if CPU(X86_64) && COMPILER(GCC_COMPATIBLE) uint64_t pnan = bitwise_cast<uint64_t>(PNaN); asm volatile ( "rep stosq\n\t" : "+D"(base), "+c"(count) : "a"(pnan) : "memory" ); #else // not CPU(X86_64) // Oh no, we can't actually do any better than this! for (unsigned i = count; i--;) base[i] = PNaN; #endif // generic CPU } #endif // USE(JSVALUE64) } // namespace JSC