1 files changed, 72 insertions, 0 deletions
diff --git a/include/tools/simdsupport.hxx b/include/tools/simdsupport.hxx
new file mode 100644
index 000000000..4ef7a6980
--- /dev/null
+++ b/include/tools/simdsupport.hxx
@@ -0,0 +1,72 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+// Determine the compiler support for SIMD compiler intrinsics.
+// This changes from one compiled unit to the other, depending if
+// the support has been detected and if the compiled unit contains
+// code using intrinsics or not. So we have to (re)set them again
+// every time this file has been included.
+
+#undef LO_SSE2_AVAILABLE
+#undef LO_SSSE3_AVAILABLE
+#undef LO_AVX_AVAILABLE
+#undef LO_AVX2_AVAILABLE
+
+#if defined(_MSC_VER) // VISUAL STUDIO COMPILER
+
+// SSE2 is required for X64
+#if (defined(_M_X64) || defined(_M_IX86_FP) && _M_IX86_FP >= 2)
+#define LO_SSE2_AVAILABLE
+#endif // end SSE2
+
+// compiled with /arch:AVX
+#if defined(__AVX__)
+#ifndef LO_SSE2_AVAILABLE
+#define LO_SSE2_AVAILABLE
+#endif
+#define LO_SSSE3_AVAILABLE
+#define LO_AVX_AVAILABLE
+#endif // defined(__AVX__)
+
+// compiled with /arch:AVX2
+#if defined(__AVX2__)
+#define LO_AVX2_AVAILABLE
+#endif // defined(__AVX2__)
+
+#else // compiler Clang and GCC
+
+#if defined(__SSE2__) || defined(__x86_64__) // SSE2 is required for X64
+#define LO_SSE2_AVAILABLE
+#endif // defined(__SSE2__)
+
+#if defined(__SSSE3__)
+#define LO_SSSE3_AVAILABLE
+#endif // defined(__SSSE3__)
+
+#if defined(__AVX__)
+#define LO_AVX_AVAILABLE
+#endif // defined(__AVX__)
+
+#if defined(__AVX2__)
+#define LO_AVX2_AVAILABLE
+#endif // defined(__AVX2__)
+
+#endif // end compiler Clang and GCC
+
+// If we detect any SIMD intrinsics, include the headers automatically
+#if defined(LO_SSE2_AVAILABLE)
+#include <emmintrin.h>
+#elif defined(LO_SSSE3_AVAILABLE)
+#include <tmmintrin.h>
+#elif defined(LO_AVX_AVAILABLE) || defined(LO_AVX2_AVAILABLE)
+#include <immintrin.h>
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */