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hyung-hwan 2008-04-26 03:18:57 +00:00
parent 301c632c41
commit a6709316f3
1 changed files with 11 additions and 2 deletions
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11
ase/cmn/mem.c
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@ -1,5 +1,5 @@
/* /*
* $Id: mem.c 175 2008-04-25 08:57:55Z baconevi $ * $Id: mem.c 176 2008-04-25 09:18:57Z baconevi $
* *
* {License} * {License}
*/ */
@ -236,14 +236,23 @@ int ase_memcmp (const void* s1, const void* s2, ase_size_t n)
unsigned int cnt; unsigned int cnt;
unsigned int pat; unsigned int pat;
/* compare 16 chars at one time */
tmp = spu_gather(spu_cmpeq(*v1,*v2)); tmp = spu_gather(spu_cmpeq(*v1,*v2));
/* extract the bit pattern */
pat = spu_extract(tmp, 0); pat = spu_extract(tmp, 0);
/* invert the bit patterns */
pat = 0xFFFF & ~pat; pat = 0xFFFF & ~pat;
/* put it back to the vector */
tmp = spu_insert (pat, tmp, 0); tmp = spu_insert (pat, tmp, 0);
/* count the leading zeros */
cnt = spu_extract(spu_cntlz(tmp),0); cnt = spu_extract(spu_cntlz(tmp),0);
/* 32 leading zeros mean that
* all characters are the same */
if (cnt != 32) if (cnt != 32)
{ {
/* otherwise, calculate the
* unmatching pointer address */
b1 = (const ase_byte_t*)v1 + (cnt - 16); b1 = (const ase_byte_t*)v1 + (cnt - 16);
b2 = (const ase_byte_t*)v2 + (cnt - 16); b2 = (const ase_byte_t*)v2 + (cnt - 16);
break; break;