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Core: Mem

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git-svn-id: svn://ultimatepp.org/upp/trunk@14523 f0d560ea-af0d-0410-9eb7-867de7ffcac7
This commit is contained in:
cxl 2020-06-01 00:19:02 +00:00
parent e21fe262af
commit 07c9863003
3 changed files with 41 additions and 35 deletions
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36
uppsrc/Core/Mem.cpp
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@ -85,4 +85,40 @@ bool memeq64(const void *p, const void *q, size_t len) { return inline_memeq64_a
#endif
#ifdef CPU_UNALIGNED
NOUBSAN // CPU supports unaligned memory access
hash_t memhash(const void *ptr, size_t count)
{
unsigned hash = 1234567890U;
const unsigned *ds = (unsigned *)ptr;
const unsigned *de = ds + (count >> 2);
while(ds < de)
hash = ((hash << 5) - hash) ^ *ds++;
const byte *s = (byte *)ds;
const byte *e = s + (count & 3);
while(s < e)
hash = ((hash << 5) - hash) ^ *s++;
return hash;
}
#else
hash_t memhash(const void *ptr, size_t count)
{
unsigned hash = 1234567890U;
const byte *s = (byte *)ptr;
const byte *e = s + count;
while(s < e)
hash = ((hash << 5) - hash) ^ *s++;
return hash;
}
#endif
};

36
uppsrc/Core/Mem.h
View file

@ -615,38 +615,4 @@ int inline_memcmp_aligned(const char *a, const char *b, size_t len)
}
#endif
#ifdef CPU_UNALIGNED
NOUBSAN // CPU supports unaligned memory access
inline hash_t memhash(const void *ptr, size_t count)
{
unsigned hash = 1234567890U;
const unsigned *ds = (unsigned *)ptr;
const unsigned *de = ds + (count >> 2);
while(ds < de)
hash = ((hash << 5) - hash) ^ *ds++;
const byte *s = (byte *)ds;
const byte *e = s + (count & 3);
while(s < e)
hash = ((hash << 5) - hash) ^ *s++;
return hash;
}
#else
inline hash_t memhash(const void *ptr, size_t count)
{
unsigned hash = 1234567890U;
const byte *s = (byte *)ptr;
const byte *e = s + count;
while(s < e)
hash = ((hash << 5) - hash) ^ *s++;
return hash;
}
#endif
hash_t memhash(const void *ptr, size_t count);

4
uppsrc/Core/Ops.h
View file

@ -158,6 +158,10 @@ inline dword FoldHash(dword h)
return SwapEndian32(0xa3613c16 * h);
}
#define HASH32_CONST1 0xf7c21089
#define HASH32_CONST2 0xc85abc8d
#define HASH32_CONST3 0x8642b0fe
#define HASH64_CONST1 I64(0xf7c21089bee7c0a5)
#define HASH64_CONST2 I64(0xc85abc8da7534a4d)
#define HASH64_CONST3 I64(0x8642b0fe3e86671b)