1 files changed, 68 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/runtime/ArrayConventions.cpp b/Source/JavaScriptCore/runtime/ArrayConventions.cpp
new file mode 100644
index 000000000..69a478902
--- /dev/null
+++ b/Source/JavaScriptCore/runtime/ArrayConventions.cpp
@@ -0,0 +1,68 @@
+/*
+ * 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_OR_CLANG)
+    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_OR_CLANG)
+    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
+