mirror of https://github.com/encounter/SDL.git
303 lines
9.6 KiB
C
303 lines
9.6 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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* \file SDL_cpuinfo.h
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*
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* CPU feature detection for SDL.
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*/
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#ifndef SDL_cpuinfo_h_
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#define SDL_cpuinfo_h_
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#include "SDL_stdinc.h"
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/* Need to do this here because intrin.h has C++ code in it */
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/* Visual Studio 2005 has a bug where intrin.h conflicts with winnt.h */
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#if defined(_MSC_VER) && (_MSC_VER >= 1500) && (defined(_M_IX86) || defined(_M_X64))
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#ifdef __clang__
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/* Many of the intrinsics SDL uses are not implemented by clang with Visual Studio */
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#undef __MMX__
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#undef __SSE__
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#undef __SSE2__
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#else
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#include <intrin.h>
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#ifndef _WIN64
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#ifndef __MMX__
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#define __MMX__
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#endif
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#ifndef __3dNOW__
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#define __3dNOW__
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#endif
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#endif
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#ifndef __SSE__
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#define __SSE__
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#endif
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#ifndef __SSE2__
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#define __SSE2__
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#endif
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#endif /* __clang__ */
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#elif defined(__MINGW64_VERSION_MAJOR)
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#include <intrin.h>
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#if !defined(SDL_DISABLE_ARM_NEON_H) && defined(__ARM_NEON)
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# include <arm_neon.h>
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#endif
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#else
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/* altivec.h redefining bool causes a number of problems, see bugs 3993 and 4392, so you need to explicitly define SDL_ENABLE_ALTIVEC_H to have it included. */
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#if defined(HAVE_ALTIVEC_H) && defined(__ALTIVEC__) && !defined(__APPLE_ALTIVEC__) && defined(SDL_ENABLE_ALTIVEC_H)
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#include <altivec.h>
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#endif
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#if !defined(SDL_DISABLE_ARM_NEON_H)
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# if defined(__ARM_NEON)
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# include <arm_neon.h>
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# elif defined(__WINDOWS__) || defined(__WINRT__)
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/* Visual Studio doesn't define __ARM_ARCH, but _M_ARM (if set, always 7), and _M_ARM64 (if set, always 1). */
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# if defined(_M_ARM)
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# include <armintr.h>
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# include <arm_neon.h>
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# define __ARM_NEON 1 /* Set __ARM_NEON so that it can be used elsewhere, at compile time */
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# endif
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# if defined (_M_ARM64)
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# include <arm64intr.h>
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# include <arm64_neon.h>
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# define __ARM_NEON 1 /* Set __ARM_NEON so that it can be used elsewhere, at compile time */
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# endif
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# endif
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#endif
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#if defined(__3dNOW__) && !defined(SDL_DISABLE_MM3DNOW_H)
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#include <mm3dnow.h>
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#endif
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#if defined(HAVE_IMMINTRIN_H) && !defined(SDL_DISABLE_IMMINTRIN_H)
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#include <immintrin.h>
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#else
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#if defined(__MMX__) && !defined(SDL_DISABLE_MMINTRIN_H)
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#include <mmintrin.h>
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#endif
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#if defined(__SSE__) && !defined(SDL_DISABLE_XMMINTRIN_H)
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#include <xmmintrin.h>
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#endif
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#if defined(__SSE2__) && !defined(SDL_DISABLE_EMMINTRIN_H)
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#include <emmintrin.h>
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#endif
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#if defined(__SSE3__) && !defined(SDL_DISABLE_PMMINTRIN_H)
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#include <pmmintrin.h>
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#endif
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#endif /* HAVE_IMMINTRIN_H */
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#endif /* compiler version */
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* This is a guess for the cacheline size used for padding.
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* Most x86 processors have a 64 byte cache line.
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* The 64-bit PowerPC processors have a 128 byte cache line.
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* We'll use the larger value to be generally safe.
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*/
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#define SDL_CACHELINE_SIZE 128
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/**
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* This function returns the number of CPU cores available.
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*/
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extern DECLSPEC int SDLCALL SDL_GetCPUCount(void);
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/**
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* This function returns the L1 cache line size of the CPU
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*
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* This is useful for determining multi-threaded structure padding
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* or SIMD prefetch sizes.
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*/
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extern DECLSPEC int SDLCALL SDL_GetCPUCacheLineSize(void);
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/**
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* This function returns true if the CPU has the RDTSC instruction.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasRDTSC(void);
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/**
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* This function returns true if the CPU has AltiVec features.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasAltiVec(void);
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/**
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* This function returns true if the CPU has MMX features.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasMMX(void);
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/**
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* This function returns true if the CPU has 3DNow! features.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_Has3DNow(void);
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/**
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* This function returns true if the CPU has SSE features.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE(void);
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/**
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* This function returns true if the CPU has SSE2 features.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE2(void);
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/**
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* This function returns true if the CPU has SSE3 features.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE3(void);
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/**
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* This function returns true if the CPU has SSE4.1 features.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE41(void);
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/**
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* This function returns true if the CPU has SSE4.2 features.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE42(void);
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/**
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* This function returns true if the CPU has AVX features.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasAVX(void);
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/**
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* This function returns true if the CPU has AVX2 features.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasAVX2(void);
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/**
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* This function returns true if the CPU has AVX-512F (foundation) features.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasAVX512F(void);
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/**
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* This function returns true if the CPU has ARM SIMD (ARMv6) features.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasARMSIMD(void);
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/**
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* This function returns true if the CPU has NEON (ARM SIMD) features.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_HasNEON(void);
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/**
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* This function returns the amount of RAM configured in the system, in MB.
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*/
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extern DECLSPEC int SDLCALL SDL_GetSystemRAM(void);
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/**
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* \brief Report the alignment this system needs for SIMD allocations.
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*
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* This will return the minimum number of bytes to which a pointer must be
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* aligned to be compatible with SIMD instructions on the current machine.
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* For example, if the machine supports SSE only, it will return 16, but if
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* it supports AVX-512F, it'll return 64 (etc). This only reports values for
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* instruction sets SDL knows about, so if your SDL build doesn't have
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* SDL_HasAVX512F(), then it might return 16 for the SSE support it sees and
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* not 64 for the AVX-512 instructions that exist but SDL doesn't know about.
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* Plan accordingly.
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*/
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extern DECLSPEC size_t SDLCALL SDL_SIMDGetAlignment(void);
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/**
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* \brief Allocate memory in a SIMD-friendly way.
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*
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* This will allocate a block of memory that is suitable for use with SIMD
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* instructions. Specifically, it will be properly aligned and padded for
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* the system's supported vector instructions.
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*
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* The memory returned will be padded such that it is safe to read or write
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* an incomplete vector at the end of the memory block. This can be useful
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* so you don't have to drop back to a scalar fallback at the end of your
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* SIMD processing loop to deal with the final elements without overflowing
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* the allocated buffer.
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*
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* You must free this memory with SDL_FreeSIMD(), not free() or SDL_free()
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* or delete[], etc.
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*
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* Note that SDL will only deal with SIMD instruction sets it is aware of;
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* for example, SDL 2.0.8 knows that SSE wants 16-byte vectors
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* (SDL_HasSSE()), and AVX2 wants 32 bytes (SDL_HasAVX2()), but doesn't
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* know that AVX-512 wants 64. To be clear: if you can't decide to use an
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* instruction set with an SDL_Has*() function, don't use that instruction
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* set with memory allocated through here.
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*
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* SDL_AllocSIMD(0) will return a non-NULL pointer, assuming the system isn't
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* out of memory.
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*
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* \param len The length, in bytes, of the block to allocated. The actual
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* allocated block might be larger due to padding, etc.
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* \return Pointer to newly-allocated block, NULL if out of memory.
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*
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* \sa SDL_SIMDAlignment
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* \sa SDL_SIMDRealloc
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* \sa SDL_SIMDFree
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*/
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extern DECLSPEC void * SDLCALL SDL_SIMDAlloc(const size_t len);
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/**
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* \brief Reallocate memory obtained from SDL_SIMDAlloc
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*
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* It is not valid to use this function on a pointer from anything but
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* SDL_SIMDAlloc(). It can't be used on pointers from malloc, realloc,
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* SDL_malloc, memalign, new[], etc.
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*
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* \param mem The pointer obtained from SDL_SIMDAlloc. This function also
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* accepts NULL, at which point this function is the same as
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* calling SDL_realloc with a NULL pointer.
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* \param len The length, in bytes, of the block to allocated. The actual
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* allocated block might be larger due to padding, etc. Passing 0
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* will return a non-NULL pointer, assuming the system isn't out of
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* memory.
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* \return Pointer to newly-reallocated block, NULL if out of memory.
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*
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* \sa SDL_SIMDAlignment
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* \sa SDL_SIMDAlloc
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* \sa SDL_SIMDFree
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*/
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extern DECLSPEC void * SDLCALL SDL_SIMDRealloc(void *mem, const size_t len);
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/**
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* \brief Deallocate memory obtained from SDL_SIMDAlloc
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*
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* It is not valid to use this function on a pointer from anything but
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* SDL_SIMDAlloc(). It can't be used on pointers from malloc, realloc,
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* SDL_malloc, memalign, new[], etc.
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*
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* However, SDL_SIMDFree(NULL) is a legal no-op.
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*
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* \sa SDL_SIMDAlloc
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* \sa SDL_SIMDRealloc
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*/
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extern DECLSPEC void SDLCALL SDL_SIMDFree(void *ptr);
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/* vi: set ts=4 sw=4 expandtab: */
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include "close_code.h"
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#endif /* SDL_cpuinfo_h_ */
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/* vi: set ts=4 sw=4 expandtab: */
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