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Allow optimizing memcpy and memset where possible

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Modern C runtimes have well optimized memset and memcpy, so use those instead of dispatching into SDL's versions. In addition, some compilers can analyze memset and memcpy calls and directly turn them into optimized assembly.
This commit is contained in:
Sam Lantinga 2024-01-20 08:12:11 -08:00
parent 8d25c2d260
commit 7a069cc4b0
16 changed files with 390 additions and 220 deletions
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54
include/SDL3/SDL_stdinc.h
View file

@ -522,22 +522,45 @@ extern DECLSPEC int SDLCALL SDL_tolower(int x);
extern DECLSPEC Uint16 SDLCALL SDL_crc16(Uint16 crc, const void *data, size_t len);
extern DECLSPEC Uint32 SDLCALL SDL_crc32(Uint32 crc, const void *data, size_t len);
extern DECLSPEC void *SDLCALL SDL_memcpy(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len);
/* Take advantage of compiler optimizations for memcpy */
#ifndef SDL_SLOW_MEMCPY
#ifdef SDL_memcpy
#undef SDL_memcpy
#endif
#define SDL_memcpy memcpy
#endif
#define SDL_copyp(dst, src) \
{ SDL_COMPILE_TIME_ASSERT(SDL_copyp, sizeof (*(dst)) == sizeof (*(src))); } \
SDL_memcpy((dst), (src), sizeof(*(src)))
extern DECLSPEC void *SDLCALL SDL_memmove(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len);
/* Take advantage of compiler optimizations for memmove */
#ifndef SDL_SLOW_MEMMOVE
#ifdef SDL_memmove
#undef SDL_memmove
#endif
#define SDL_memmove memmove
#endif
extern DECLSPEC void *SDLCALL SDL_memset(SDL_OUT_BYTECAP(len) void *dst, int c, size_t len);
extern DECLSPEC void *SDLCALL SDL_memset4(void *dst, Uint32 val, size_t dwords);
/* Take advantage of compiler optimizations for memset */
#ifndef SDL_SLOW_MEMSET
#ifdef SDL_memset
#undef SDL_memset
#endif
#define SDL_memset memset
#endif
#define SDL_zero(x) SDL_memset(&(x), 0, sizeof((x)))
#define SDL_zerop(x) SDL_memset((x), 0, sizeof(*(x)))
#define SDL_zeroa(x) SDL_memset((x), 0, sizeof((x)))
#define SDL_copyp(dst, src) \
{ SDL_COMPILE_TIME_ASSERT(SDL_copyp, sizeof (*(dst)) == sizeof (*(src))); } \
SDL_memcpy((dst), (src), sizeof (*(src)))
extern DECLSPEC void *SDLCALL SDL_memcpy(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len);
extern DECLSPEC void *SDLCALL SDL_memmove(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len);
extern DECLSPEC int SDLCALL SDL_memcmp(const void *s1, const void *s2, size_t len);
extern DECLSPEC size_t SDLCALL SDL_wcslen(const wchar_t *wstr);
@ -730,9 +753,15 @@ size_t wcslcat(wchar_t *dst, const wchar_t *src, size_t size);
#define SDL_calloc calloc
#define SDL_realloc realloc
#define SDL_free free
#define SDL_memset memset
#ifndef SDL_memcpy
#define SDL_memcpy memcpy
#endif
#ifndef SDL_memmove
#define SDL_memmove memmove
#endif
#ifndef SDL_memset
#define SDL_memset memset
#endif
#define SDL_memcmp memcmp
#define SDL_strlcpy strlcpy
#define SDL_strlcat strlcat
@ -759,11 +788,6 @@ size_t wcslcat(wchar_t *dst, const wchar_t *src, size_t size);
#define SDL_vsnprintf vsnprintf
#endif
SDL_FORCE_INLINE void *SDL_memcpy4(SDL_OUT_BYTECAP(dwords*4) void *dst, SDL_IN_BYTECAP(dwords*4) const void *src, size_t dwords)
{
return SDL_memcpy(dst, src, dwords * 4);
}
/**
* If a * b would overflow, return -1. Otherwise store a * b via ret
* and return 0.