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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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34
src/stdlib/SDL_mslibc.c
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@@ -33,40 +33,6 @@
__declspec(selectany) int _fltused = 1;
#endif
/* The optimizer on Visual Studio 2005 and later generates memcpy() and memset() calls.
Always provide it for the SDL3 DLL, but skip it when building static lib w/ static runtime. */
#if (_MSC_VER >= 1400) && (!defined(_MT) || defined(DLL_EXPORT))
/* NOLINTNEXTLINE(readability-redundant-declaration) */
extern void *memcpy(void *dst, const void *src, size_t len);
#ifndef __INTEL_LLVM_COMPILER
#pragma intrinsic(memcpy)
#endif
#ifndef __clang__
#pragma function(memcpy)
#endif
/* NOLINTNEXTLINE(readability-inconsistent-declaration-parameter-name) */
void *memcpy(void *dst, const void *src, size_t len)
{
return SDL_memcpy(dst, src, len);
}
/* NOLINTNEXTLINE(readability-redundant-declaration) */
extern void *memset(void *dst, int c, size_t len);
#ifndef __INTEL_LLVM_COMPILER
#pragma intrinsic(memset)
#endif
#ifndef __clang__
#pragma function(memset)
#endif
/* NOLINTNEXTLINE(readability-inconsistent-declaration-parameter-name) */
void *memset(void *dst, int c, size_t len)
{
return SDL_memset(dst, c, len);
}
#endif /* (_MSC_VER >= 1400) && (!defined(_MT) || defined(DLL_EXPORT)) */
#ifdef _M_IX86
/* Float to long */