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Common: Support for function-specific instruction set target on x64

This commit is contained in:
Stenzek 2016-12-23 23:41:54 +10:00
parent 221be63cb4
commit 0f1b5a05ea
1 changed files with 60 additions and 19 deletions
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79
Source/Core/Common/Intrinsics.h
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@ -4,28 +4,69 @@
#pragma once
#ifdef _M_X86
#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.
*/
#ifdef _MSC_VER
#include <intrin.h>
#else
#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
#if defined _M_GENERIC
#define _M_SSE 0
#elif _MSC_VER || __INTEL_COMPILER
#define _M_SSE 0x402
#elif defined __GNUC__
#if defined __SSE4_2__
#define _M_SSE 0x402
#elif defined __SSE4_1__
#define _M_SSE 0x401
#elif defined __SSSE3__
#define _M_SSE 0x301
#elif defined __SSE3__
#define _M_SSE 0x300
#endif
#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