SDL 2.0
SDL_cpuinfo.h
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1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20*/
21
22/**
23 * \file SDL_cpuinfo.h
24 *
25 * CPU feature detection for SDL.
26 */
27
28#ifndef SDL_cpuinfo_h_
29#define SDL_cpuinfo_h_
30
31#include "SDL_stdinc.h"
32
33/* Need to do this here because intrin.h has C++ code in it */
34/* Visual Studio 2005 has a bug where intrin.h conflicts with winnt.h */
35#if defined(_MSC_VER) && (_MSC_VER >= 1500) && (defined(_M_IX86) || defined(_M_X64))
36#ifdef __clang__
37/* Many of the intrinsics SDL uses are not implemented by clang with Visual Studio */
38#undef __MMX__
39#undef __SSE__
40#undef __SSE2__
41#else
42#include <intrin.h>
43#ifndef _WIN64
44#ifndef __MMX__
45#define __MMX__
46#endif
47#ifndef __3dNOW__
48#define __3dNOW__
49#endif
50#endif
51#ifndef __SSE__
52#define __SSE__
53#endif
54#ifndef __SSE2__
55#define __SSE2__
56#endif
57#endif /* __clang__ */
58#elif defined(__MINGW64_VERSION_MAJOR)
59#include <intrin.h>
60#else
61/* 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. */
62#if defined(HAVE_ALTIVEC_H) && defined(__ALTIVEC__) && !defined(__APPLE_ALTIVEC__) && defined(SDL_ENABLE_ALTIVEC_H)
63#include <altivec.h>
64#endif
65#if !defined(SDL_DISABLE_ARM_NEON_H)
66# if defined(__ARM_NEON)
67# include <arm_neon.h>
68# elif defined(__WINDOWS__) || defined(__WINRT__)
69/* Visual Studio doesn't define __ARM_ARCH, but _M_ARM (if set, always 7), and _M_ARM64 (if set, always 1). */
70# if defined(_M_ARM)
71# include <armintr.h>
72# include <arm_neon.h>
73# define __ARM_NEON 1 /* Set __ARM_NEON so that it can be used elsewhere, at compile time */
74# endif
75# if defined (_M_ARM64)
76# include <armintr.h>
77# include <arm_neon.h>
78# define __ARM_NEON 1 /* Set __ARM_NEON so that it can be used elsewhere, at compile time */
79# endif
80# endif
81#endif
82#if defined(__3dNOW__) && !defined(SDL_DISABLE_MM3DNOW_H)
83#include <mm3dnow.h>
84#endif
85#if defined(HAVE_IMMINTRIN_H) && !defined(SDL_DISABLE_IMMINTRIN_H)
86#include <immintrin.h>
87#else
88#if defined(__MMX__) && !defined(SDL_DISABLE_MMINTRIN_H)
89#include <mmintrin.h>
90#endif
91#if defined(__SSE__) && !defined(SDL_DISABLE_XMMINTRIN_H)
92#include <xmmintrin.h>
93#endif
94#if defined(__SSE2__) && !defined(SDL_DISABLE_EMMINTRIN_H)
95#include <emmintrin.h>
96#endif
97#if defined(__SSE3__) && !defined(SDL_DISABLE_PMMINTRIN_H)
98#include <pmmintrin.h>
99#endif
100#endif /* HAVE_IMMINTRIN_H */
101#endif /* compiler version */
102
103#include "begin_code.h"
104/* Set up for C function definitions, even when using C++ */
105#ifdef __cplusplus
106extern "C" {
107#endif
108
109/* This is a guess for the cacheline size used for padding.
110 * Most x86 processors have a 64 byte cache line.
111 * The 64-bit PowerPC processors have a 128 byte cache line.
112 * We'll use the larger value to be generally safe.
113 */
114#define SDL_CACHELINE_SIZE 128
115
116/**
117 * This function returns the number of CPU cores available.
118 */
119extern DECLSPEC int SDLCALL SDL_GetCPUCount(void);
120
121/**
122 * This function returns the L1 cache line size of the CPU
123 *
124 * This is useful for determining multi-threaded structure padding
125 * or SIMD prefetch sizes.
126 */
128
129/**
130 * This function returns true if the CPU has the RDTSC instruction.
131 */
133
134/**
135 * This function returns true if the CPU has AltiVec features.
136 */
138
139/**
140 * This function returns true if the CPU has MMX features.
141 */
143
144/**
145 * This function returns true if the CPU has 3DNow! features.
146 */
148
149/**
150 * This function returns true if the CPU has SSE features.
151 */
153
154/**
155 * This function returns true if the CPU has SSE2 features.
156 */
158
159/**
160 * This function returns true if the CPU has SSE3 features.
161 */
163
164/**
165 * This function returns true if the CPU has SSE4.1 features.
166 */
168
169/**
170 * This function returns true if the CPU has SSE4.2 features.
171 */
173
174/**
175 * This function returns true if the CPU has AVX features.
176 */
178
179/**
180 * This function returns true if the CPU has AVX2 features.
181 */
183
184/**
185 * This function returns true if the CPU has AVX-512F (foundation) features.
186 */
188
189/**
190 * This function returns true if the CPU has NEON (ARM SIMD) features.
191 */
193
194/**
195 * This function returns the amount of RAM configured in the system, in MB.
196 */
197extern DECLSPEC int SDLCALL SDL_GetSystemRAM(void);
198
199/**
200 * \brief Report the alignment this system needs for SIMD allocations.
201 *
202 * This will return the minimum number of bytes to which a pointer must be
203 * aligned to be compatible with SIMD instructions on the current machine.
204 * For example, if the machine supports SSE only, it will return 16, but if
205 * it supports AVX-512F, it'll return 64 (etc). This only reports values for
206 * instruction sets SDL knows about, so if your SDL build doesn't have
207 * SDL_HasAVX512F(), then it might return 16 for the SSE support it sees and
208 * not 64 for the AVX-512 instructions that exist but SDL doesn't know about.
209 * Plan accordingly.
210 */
211extern DECLSPEC size_t SDLCALL SDL_SIMDGetAlignment(void);
212
213/**
214 * \brief Allocate memory in a SIMD-friendly way.
215 *
216 * This will allocate a block of memory that is suitable for use with SIMD
217 * instructions. Specifically, it will be properly aligned and padded for
218 * the system's supported vector instructions.
219 *
220 * The memory returned will be padded such that it is safe to read or write
221 * an incomplete vector at the end of the memory block. This can be useful
222 * so you don't have to drop back to a scalar fallback at the end of your
223 * SIMD processing loop to deal with the final elements without overflowing
224 * the allocated buffer.
225 *
226 * You must free this memory with SDL_FreeSIMD(), not free() or SDL_free()
227 * or delete[], etc.
228 *
229 * Note that SDL will only deal with SIMD instruction sets it is aware of;
230 * for example, SDL 2.0.8 knows that SSE wants 16-byte vectors
231 * (SDL_HasSSE()), and AVX2 wants 32 bytes (SDL_HasAVX2()), but doesn't
232 * know that AVX-512 wants 64. To be clear: if you can't decide to use an
233 * instruction set with an SDL_Has*() function, don't use that instruction
234 * set with memory allocated through here.
235 *
236 * SDL_AllocSIMD(0) will return a non-NULL pointer, assuming the system isn't
237 * out of memory.
238 *
239 * \param len The length, in bytes, of the block to allocated. The actual
240 * allocated block might be larger due to padding, etc.
241 * \return Pointer to newly-allocated block, NULL if out of memory.
242 *
243 * \sa SDL_SIMDAlignment
244 * \sa SDL_SIMDFree
245 */
246extern DECLSPEC void * SDLCALL SDL_SIMDAlloc(const size_t len);
247
248/**
249 * \brief Deallocate memory obtained from SDL_SIMDAlloc
250 *
251 * It is not valid to use this function on a pointer from anything but
252 * SDL_SIMDAlloc(). It can't be used on pointers from malloc, realloc,
253 * SDL_malloc, memalign, new[], etc.
254 *
255 * However, SDL_SIMDFree(NULL) is a legal no-op.
256 *
257 * \sa SDL_SIMDAlloc
258 */
259extern DECLSPEC void SDLCALL SDL_SIMDFree(void *ptr);
260
261/* vi: set ts=4 sw=4 expandtab: */
262/* Ends C function definitions when using C++ */
263#ifdef __cplusplus
264}
265#endif
266#include "close_code.h"
267
268#endif /* SDL_cpuinfo_h_ */
269
270/* vi: set ts=4 sw=4 expandtab: */
SDL_bool SDL_HasSSE2(void)
SDL_bool SDL_HasSSE42(void)
Definition: SDL_cpuinfo.c:729
SDL_bool SDL_HasNEON(void)
SDL_bool SDL_HasSSE3(void)
Definition: SDL_cpuinfo.c:717
SDL_bool SDL_HasAVX2(void)
Definition: SDL_cpuinfo.c:741
SDL_bool SDL_HasSSE41(void)
SDL_bool SDL_HasMMX(void)
Definition: SDL_cpuinfo.c:693
SDL_bool SDL_HasAltiVec(void)
void * SDL_SIMDAlloc(const size_t len)
Allocate memory in a SIMD-friendly way.
Definition: SDL_cpuinfo.c:823
void SDL_SIMDFree(void *ptr)
Deallocate memory obtained from SDL_SIMDAlloc.
Definition: SDL_cpuinfo.c:840
size_t SDL_SIMDGetAlignment(void)
Report the alignment this system needs for SIMD allocations.
int SDL_GetSystemRAM(void)
SDL_bool SDL_HasAVX512F(void)
Definition: SDL_cpuinfo.c:747
int SDL_GetCPUCount(void)
Definition: SDL_cpuinfo.c:447
SDL_bool SDL_HasAVX(void)
int SDL_GetCPUCacheLineSize(void)
SDL_bool SDL_HasRDTSC(void)
Definition: SDL_cpuinfo.c:681
SDL_bool SDL_HasSSE(void)
Definition: SDL_cpuinfo.c:705
SDL_bool SDL_Has3DNow(void)
#define SDLCALL
Definition: SDL_internal.h:49
#define DECLSPEC
Definition: SDL_internal.h:48
GLenum GLsizei len
SDL_bool
Definition: SDL_stdinc.h:162