add missing cpuid.cpp

src/cpuid.cpp

@@ -0,0 +1,91 @@
+/*
+
+Copyright (c) 2014-2015, Arvid Norberg
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * 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.
+    * Neither the name of the author nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER 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 "libtorrent/config.hpp"
+#include <cstring>
+
+#include "libtorrent/aux_/cpuid.hpp"
+
+#if defined _MSC_VER && TORRENT_HAS_SSE
+#include <intrin.h>
+#include <nmmintrin.h>
+#endif
+
+namespace libtorrent { namespace aux
+{
+	namespace {
+
+	// internal
+	void cpuid(unsigned int info[4], int type)
+	{
+#if TORRENT_HAS_SSE && defined _MSC_VER
+		__cpuid((int*)info, type);
+
+#elif TORRENT_HAS_SSE && defined __GNUC__
+		asm volatile
+			("cpuid" : "=a" (info[0]), "=b" (info[1]), "=c" (info[2]), "=d" (info[3])
+			 : "a" (type), "c" (0));
+#else
+		// for non-x86 and non-amd64, just return zeroes
+		std::memset(&info[0], 0, sizeof(unsigned int) * 4);
+#endif
+	}
+
+	bool supports_sse42()
+	{
+#if TORRENT_HAS_SSE
+		unsigned int cpui[4];
+		cpuid(cpui, 1);
+		return cpui[2] & (1 << 20);
+#else
+		return false;
+#endif
+	}
+
+	bool supports_mmx()
+	{
+#if TORRENT_HAS_SSE
+		unsigned int cpui[4];
+		cpuid(cpui, 1);
+		return cpui[2] & (1 << 23);
+#else
+		return false;
+#endif
+	}
+
+	} // anonymous namespace
+
+	bool sse42_support = supports_sse42();
+	bool mmx_support = supports_mmx();
+} }
+
+