Adding upstream version 4:24.2.0.upstream/4%24.2.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 109 insertions, 0 deletions

diff --git a/include/tools/cpuid.hxx b/include/tools/cpuid.hxx
new file mode 100644
index 0000000000..4f309ff11e
--- /dev/null
+++ b/include/tools/cpuid.hxx
@@ -0,0 +1,109 @@
+/* -*- 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/.
+ *
+ */
+
+#pragma once
+
+#include <sal/config.h>
+#include <tools/toolsdllapi.h>
+#include <o3tl/typed_flags_set.hxx>
+#include <rtl/ustring.hxx>
+
+/*
+
+Do NOT include this header in source files compiled with CPU-specific code.
+TODO: For the header to be safe that way, it should be free of any templates
+or inline functions, otherwise their possibly emitted copies compiled
+with the CPU-specific instructions might be chosen by the linker as the copy
+to keep.
+
+Also see the note at the top of simdsupport.hxx .
+
+*/
+
+namespace cpuid {
+
+enum class InstructionSetFlags
+{
+    NONE  = 0x00,
+    HYPER = 0x01,
+    SSE2  = 0x02,
+    SSSE3 = 0x04,
+    SSE41 = 0x08,
+    SSE42 = 0x10,
+    AVX   = 0x20,
+    AVX2  = 0x40,
+    AVX512F = 0x80
+};
+
+} // end cpuid
+
+namespace o3tl {
+    template<> struct typed_flags<cpuid::InstructionSetFlags> : is_typed_flags<cpuid::InstructionSetFlags, 0x0ff> {};
+}
+
+namespace cpuid {
+
+/** Get supported instruction set flags determined at runtime by probing the CPU.
+ */
+TOOLS_DLLPUBLIC InstructionSetFlags getCpuInstructionSetFlags();
+
+/** Check if a certain instruction set is supported by the CPU at runtime.
+ */
+TOOLS_DLLPUBLIC bool isCpuInstructionSetSupported(InstructionSetFlags eInstructions);
+
+/** Returns a string of supported instructions.
+ */
+TOOLS_DLLPUBLIC OUString instructionSetSupportedString();
+
+/** Check if SSE2 is supported by the CPU
+ */
+inline bool hasSSE2()
+{
+    return isCpuInstructionSetSupported(InstructionSetFlags::SSE2);
+}
+
+/** Check if SSSE3 is supported by the CPU
+ */
+inline bool hasSSSE3()
+{
+    return isCpuInstructionSetSupported(InstructionSetFlags::SSSE3);
+}
+
+/** Check if AVX is supported by the CPU
+ */
+inline bool hasAVX()
+{
+    return isCpuInstructionSetSupported(InstructionSetFlags::AVX);
+}
+
+/** Check if AVX2 is supported by the CPU
+ */
+inline bool hasAVX2()
+{
+    return isCpuInstructionSetSupported(InstructionSetFlags::AVX2);
+}
+
+/** Check if AVX512F is supported by the CPU
+ */
+inline bool hasAVX512F()
+{
+    return isCpuInstructionSetSupported(InstructionSetFlags::AVX512F);
+}
+
+/** Check if Hyper Threading is supported
+ */
+inline bool hasHyperThreading()
+{
+    return isCpuInstructionSetSupported(InstructionSetFlags::HYPER);
+}
+
+} // end cpuid
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */