1 files changed, 72 insertions, 0 deletions
diff --git a/src/dolphin/Intrinsics.h b/src/dolphin/Intrinsics.h
new file mode 100644
index 0000000..483f219
--- /dev/null
+++ b/src/dolphin/Intrinsics.h
@@ -0,0 +1,72 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license_dolphin.txt file included.
+
+#pragma once
+
+#if defined(_M_X86)
+
+/**
+ * It is assumed that all compilers used to build Dolphin support intrinsics up to and including
+ * SSE 4.2 on x86/x64.
+ */
+
+#if defined(__GNUC__) || defined(__clang__)
+
+/**
+ * Due to limitations in GCC, SSE intrinsics are only available when compiling with the
+ * corresponding instruction set enabled. However, using the target attribute, we can compile
+ * single functions with a different target instruction set, while still creating a generic build.
+ *
+ * Since this instruction set is enabled per-function, any callers should verify that the
+ * instruction set is supported at runtime before calling it, and provide a fallback implementation
+ * when not supported.
+ *
+ * When building with -march=native, or enabling the instruction sets in the compile flags, permit
+ * usage of the instrinsics without any function attributes. If the command-line architecture does
+ * not support this instruction set, enable it via function targeting.
+ */
+
+#include <x86intrin.h>
+#ifndef __SSE4_2__
+#define FUNCTION_TARGET_SSE42 [[gnu::target("sse4.2")]]
+#endif
+#ifndef __SSE4_1__
+#define FUNCTION_TARGET_SSR41 [[gnu::target("sse4.1")]]
+#endif
+#ifndef __SSSE3__
+#define FUNCTION_TARGET_SSSE3 [[gnu::target("ssse3")]]
+#endif
+#ifndef __SSE3__
+#define FUNCTION_TARGET_SSE3 [[gnu::target("sse3")]]
+#endif
+
+#elif defined(_MSC_VER) || defined(__INTEL_COMPILER)
+
+/**
+ * MSVC and ICC support intrinsics for any instruction set without any function attributes.
+ */
+#include <intrin.h>
+
+#endif  // defined(_MSC_VER) || defined(__INTEL_COMPILER)
+
+#endif  // _M_X86
+
+/**
+ * Define the FUNCTION_TARGET macros to nothing if they are not needed, or not on an X86 platform.
+ * This way when a function is defined with FUNCTION_TARGET you don't need to define a second
+ * version without the macro around a #ifdef guard. Be careful when using intrinsics, as all use
+ * should still be placed around a #ifdef _M_X86 if the file is compiled on all architectures.
+ */
+#ifndef FUNCTION_TARGET_SSE42
+#define FUNCTION_TARGET_SSE42
+#endif
+#ifndef FUNCTION_TARGET_SSR41
+#define FUNCTION_TARGET_SSR41
+#endif
+#ifndef FUNCTION_TARGET_SSSE3
+#define FUNCTION_TARGET_SSSE3
+#endif
+#ifndef FUNCTION_TARGET_SSE3
+#define FUNCTION_TARGET_SSE3
+#endif