SDL 2.0
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Macros | |
#define | SDL_CACHELINE_SIZE 128 |
Functions | |
int | SDL_GetCPUCount (void) |
int | SDL_GetCPUCacheLineSize (void) |
SDL_bool | SDL_HasRDTSC (void) |
SDL_bool | SDL_HasAltiVec (void) |
SDL_bool | SDL_HasMMX (void) |
SDL_bool | SDL_Has3DNow (void) |
SDL_bool | SDL_HasSSE (void) |
SDL_bool | SDL_HasSSE2 (void) |
SDL_bool | SDL_HasSSE3 (void) |
SDL_bool | SDL_HasSSE41 (void) |
SDL_bool | SDL_HasSSE42 (void) |
SDL_bool | SDL_HasAVX (void) |
SDL_bool | SDL_HasAVX2 (void) |
SDL_bool | SDL_HasAVX512F (void) |
SDL_bool | SDL_HasNEON (void) |
int | SDL_GetSystemRAM (void) |
size_t | SDL_SIMDGetAlignment (void) |
Report the alignment this system needs for SIMD allocations. More... | |
void * | SDL_SIMDAlloc (const size_t len) |
Allocate memory in a SIMD-friendly way. More... | |
void | SDL_SIMDFree (void *ptr) |
Deallocate memory obtained from SDL_SIMDAlloc. More... | |
CPU feature detection for SDL.
Definition in file SDL_cpuinfo.h.
#define SDL_CACHELINE_SIZE 128 |
Definition at line 114 of file SDL_cpuinfo.h.
int SDL_GetCPUCacheLineSize | ( | void | ) |
This function returns the L1 cache line size of the CPU
This is useful for determining multi-threaded structure padding or SIMD prefetch sizes.
Definition at line 133 of file SDL_dynapi_procs.h.
References cpuid, d, SDL_CACHELINE_SIZE, SDL_GetCPUType(), SDL_strcmp, and void.
int SDL_GetCPUCount | ( | void | ) |
This function returns the number of CPU cores available.
Definition at line 447 of file SDL_cpuinfo.c.
References NULL, and SDL_CPUCount.
int SDL_GetSystemRAM | ( | void | ) |
This function returns the amount of RAM configured in the system, in MB.
Definition at line 143 of file SDL_dynapi_procs.h.
References NULL, and SDL_SystemRAM.
This function returns true if the CPU has 3DNow! features.
Definition at line 137 of file SDL_dynapi_procs.h.
References CPU_FEATURE_AVAILABLE, and CPU_HAS_3DNOW.
This function returns true if the CPU has AltiVec features.
Definition at line 135 of file SDL_dynapi_procs.h.
References CPU_FEATURE_AVAILABLE, and CPU_HAS_ALTIVEC.
This function returns true if the CPU has AVX features.
Definition at line 599 of file SDL_dynapi_procs.h.
References CPU_FEATURE_AVAILABLE, and CPU_HAS_AVX.
This function returns true if the CPU has AVX2 features.
Definition at line 741 of file SDL_cpuinfo.c.
References CPU_FEATURE_AVAILABLE, and CPU_HAS_AVX2.
This function returns true if the CPU has AVX-512F (foundation) features.
Definition at line 747 of file SDL_cpuinfo.c.
References CPU_FEATURE_AVAILABLE, and CPU_HAS_AVX512F.
This function returns true if the CPU has MMX features.
Definition at line 693 of file SDL_cpuinfo.c.
References CPU_FEATURE_AVAILABLE, and CPU_HAS_MMX.
This function returns true if the CPU has NEON (ARM SIMD) features.
Definition at line 652 of file SDL_dynapi_procs.h.
References CPU_FEATURE_AVAILABLE, and CPU_HAS_NEON.
This function returns true if the CPU has the RDTSC instruction.
Definition at line 681 of file SDL_cpuinfo.c.
References CPU_FEATURE_AVAILABLE, and CPU_HAS_RDTSC.
This function returns true if the CPU has SSE features.
Definition at line 705 of file SDL_cpuinfo.c.
References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE.
This function returns true if the CPU has SSE2 features.
Definition at line 139 of file SDL_dynapi_procs.h.
References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE2.
This function returns true if the CPU has SSE3 features.
Definition at line 717 of file SDL_cpuinfo.c.
References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE3.
This function returns true if the CPU has SSE4.1 features.
Definition at line 141 of file SDL_dynapi_procs.h.
References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE41.
This function returns true if the CPU has SSE4.2 features.
Definition at line 729 of file SDL_cpuinfo.c.
References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE42.
Allocate memory in a SIMD-friendly way.
This will allocate a block of memory that is suitable for use with SIMD instructions. Specifically, it will be properly aligned and padded for the system's supported vector instructions.
The memory returned will be padded such that it is safe to read or write an incomplete vector at the end of the memory block. This can be useful so you don't have to drop back to a scalar fallback at the end of your SIMD processing loop to deal with the final elements without overflowing the allocated buffer.
You must free this memory with SDL_FreeSIMD(), not free() or SDL_free() or delete[], etc.
Note that SDL will only deal with SIMD instruction sets it is aware of; for example, SDL 2.0.8 knows that SSE wants 16-byte vectors (SDL_HasSSE()), and AVX2 wants 32 bytes (SDL_HasAVX2()), but doesn't know that AVX-512 wants 64. To be clear: if you can't decide to use an instruction set with an SDL_Has*() function, don't use that instruction set with memory allocated through here.
SDL_AllocSIMD(0) will return a non-NULL pointer, assuming the system isn't out of memory.
len | The length, in bytes, of the block to allocated. The actual allocated block might be larger due to padding, etc. |
Definition at line 823 of file SDL_cpuinfo.c.
References NULL, retval, SDL_malloc, and SDL_SIMDGetAlignment().
Deallocate memory obtained from SDL_SIMDAlloc.
It is not valid to use this function on a pointer from anything but SDL_SIMDAlloc(). It can't be used on pointers from malloc, realloc, SDL_malloc, memalign, new[], etc.
However, SDL_SIMDFree(NULL) is a legal no-op.
Definition at line 840 of file SDL_cpuinfo.c.
References SDL_free.
Report the alignment this system needs for SIMD allocations.
This will return the minimum number of bytes to which a pointer must be aligned to be compatible with SIMD instructions on the current machine. For example, if the machine supports SSE only, it will return 16, but if it supports AVX-512F, it'll return 64 (etc). This only reports values for instruction sets SDL knows about, so if your SDL build doesn't have SDL_HasAVX512F(), then it might return 16 for the SSE support it sees and not 64 for the AVX-512 instructions that exist but SDL doesn't know about. Plan accordingly.
Definition at line 773 of file SDL_dynapi_procs.h.
References SDL_assert, SDL_GetCPUFeatures(), and SDL_SIMDAlignment.
Referenced by SDL_SIMDAlloc().