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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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23
src/stdlib/SDL_string.c
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@@ -325,29 +325,6 @@ static size_t SDL_ScanFloat(const char *text, double *valuep)
}
#endif
void *SDL_memmove(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len)
{
#ifdef HAVE_MEMMOVE
return memmove(dst, src, len);
#else
char *srcp = (char *)src;
char *dstp = (char *)dst;
if (src < dst) {
srcp += len - 1;
dstp += len - 1;
while (len--) {
*dstp-- = *srcp--;
}
} else {
while (len--) {
*dstp++ = *srcp++;
}
}
return dst;
#endif /* HAVE_MEMMOVE */
}
int SDL_memcmp(const void *s1, const void *s2, size_t len)
{
#ifdef __vita__