1 files changed, 50 insertions, 0 deletions
diff --git a/Source/WTF/wtf/win/WTFDLL.cpp b/Source/WTF/wtf/win/WTFDLL.cpp
new file mode 100644
index 000000000..779e1b862
--- /dev/null
+++ b/Source/WTF/wtf/win/WTFDLL.cpp
@@ -0,0 +1,50 @@
+/*
+* Copyright (C) 2015 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 <Windows.h>
+#include <math.h>
+
+BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
+{
+    switch (fdwReason) {
+    case DLL_PROCESS_ATTACH:
+#if defined(_M_X64) || defined(__x86_64__)
+        // The VS2013 runtime has a bug where it mis-detects AVX-capable processors
+        // if the feature has been disabled in firmware. This causes us to crash
+        // in some of the math functions. For now, we disable those optimizations
+        // because Microsoft is not going to fix the problem in VS2013.
+        // FIXME: http://webkit.org/b/141449: Remove this workaround when we switch to VS2015+.
+        _set_FMA3_enable(0);
+#endif
+        break;
+
+    case DLL_PROCESS_DETACH:
+    case DLL_THREAD_ATTACH:
+    case DLL_THREAD_DETACH:
+        break;
+    }
+
+    return TRUE;
+}