Vc package added (version 0.6.79-dev)

[u/mrichter/AliRoot.git] / Vc / src / support.cpp

diff --git a/Vc/src/support.cpp b/Vc/src/support.cpp
new file mode 100644 (file)
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--- /dev/null
+++ b/Vc/src/support.cpp
@@ -0,0 +1,76 @@
+/*  This file is part of the Vc library.
+
+    Copyright (C) 2010-2012 Matthias Kretz <kretz@kde.org>
+
+    Vc is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as
+    published by the Free Software Foundation, either version 3 of
+    the License, or (at your option) any later version.
+
+    Vc is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with Vc.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include <Vc/global.h>
+#include <Vc/cpuid.h>
+#include "common/support.h"
+
+#ifdef VC_MSVC
+#include <intrin.h>
+#endif
+
+namespace Vc
+{
+
+#ifdef VC_GCC
+    __attribute__((target("no-sse2,no-avx")))
+#endif
+bool isImplementationSupported(Implementation impl)
+{
+    CpuId::init();
+    // for AVX we need to check for OSXSAVE and AVX
+
+    switch (impl) {
+    case ScalarImpl:
+        return true;
+    case SSE2Impl:
+        return CpuId::hasSse2();
+    case SSE3Impl:
+        return CpuId::hasSse3();
+    case SSSE3Impl:
+        return CpuId::hasSsse3();
+    case SSE41Impl:
+        return CpuId::hasSse41();
+    case SSE42Impl:
+        return CpuId::hasSse42();
+    case SSE4aImpl:
+        return CpuId::hasSse4a();
+    case XopImpl:
+        return CpuId::hasXop();
+    case Fma4Impl:
+        return CpuId::hasFma4();
+    case AVXImpl:
+#if defined(VC_MSVC) && VC_MSVC >= 160040219 // MSVC 2010 SP1 introduced _xgetbv
+        unsigned long long xcrFeatureMask = _xgetbv(_XCR_XFEATURE_ENABLED_MASK);
+        return (xcrFeatureMask & 0x6) != 0;
+#elif !defined(VC_NO_XGETBV)
+        if (CpuId::hasOsxsave() && CpuId::hasAvx()) {
+            unsigned int eax;
+            asm("xgetbv" : "=a"(eax) : "c"(0) : "edx");
+            return (eax & 0x06) == 0x06;
+        }
+#endif
+        return false;
+    }
+    return false;
+}
+
+} // namespace Vc
+
+// vim: sw=4 sts=4 et tw=100