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string.c (search_nonascii): skip alignment adjustment for some CPUs

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Some CPUs (e.g. x86) allow unaligned access to the memory.
This commit is contained in:
Yukihiro "Matz" Matsumoto
2024-01-25 23:35:37 +09:00
parent 68ab95ea57
commit 08cd281200
1 changed files with 11 additions and 0 deletions
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src/string.c
+11
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@@ -327,10 +327,20 @@ search_nonascii(const char *p, const char *e)
# define NONASCII_MASK 0x80808080UL
#endif
#if defined(__i386) || defined(__i386__) || defined(_M_IX86) || \
defined(__x86_64) || defined(__x86_64__) || defined(_M_AMD64) || \
defined(__powerpc64__) || defined(__POWERPC__) || defined(__aarch64__) || \
defined(__mc68020__)
# define ALIGNED_WORD_ACCESS 0
#else
# define ALIGNED_WORD_ACCESS 1
#endif
static const char*
search_nonascii(const char *p, const char *e)
{
if (e - p >= sizeof(void*)) {
#if ALIGNED_WORD_ACCESS
if ((uintptr_t)p % sizeof(void*)) {
int l = sizeof(void*) - (uintptr_t)p % sizeof(void*);
p += l;
@@ -347,6 +357,7 @@ search_nonascii(const char *p, const char *e)
case 0: break;
}
}
#endif
const uintptr_t *s = (uintptr_t*)p;
const uintptr_t *t = (uintptr_t*)(e - (sizeof(void*)-1));