CPU intrinsics detection (SSE, AVX)

Adds CPU intrinsics detection in configure pass for compile time
detection and "cpuid" runtime detection of which CPU instruction
sets are available on the user device.

Change-Id: I0ee4d0b22a7c51f72796d43e7383a31d03b437ad
Reviewed-on: https://gerrit.libreoffice.org/75175
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/include/tools/simd.hxx b/include/tools/simd.hxx
new file mode 100644
index 000000000000..bdfdb8928271
--- /dev/null
+++ b/include/tools/simd.hxx
@@ -0,0 +1,30 @@
+/* -*- 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/.
+ *
+ */
+
+#ifndef INCLUDED_TOOLS_SIMD_HXX
+#define INCLUDED_TOOLS_SIMD_HXX
+
+namespace simd
+{
+template <typename T, unsigned int N> inline bool isAligned(const T* pointer)
+{
+    return 0 == (uintptr_t(pointer) % N);
+}
+
+template <typename T> inline T roundDown(T value, unsigned int multiple)
+{
+    return value & ~(multiple - 1);
+}
+
+} // end namespace simd
+
+#endif // INCLUDED_TOOLS_SIMD_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */