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speed up xorbuf

pull/2/head
weidai 2007-05-04 15:33:17 +00:00
parent 31e06b9d0b
commit 0150b2d663
1 changed files with 54 additions and 10 deletions
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64
misc.cpp
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@ -12,24 +12,68 @@ NAMESPACE_BEGIN(CryptoPP)
void xorbuf(byte *buf, const byte *mask, size_t count)
{
if (((size_t)buf | (size_t)mask | count) % WORD_SIZE == 0)
XorWords((word *)buf, (const word *)mask, count/WORD_SIZE);
else
size_t i;
if (IsAligned<word32>(buf) && IsAligned<word32>(mask))
{
for (unsigned int i=0; i<count; i++)
buf[i] ^= mask[i];
#if defined(WORD64_AVAILABLE) && !defined(CRYPTOPP_SLOW_WORD64)
if (IsAligned<word64>(buf) && IsAligned<word64>(mask))
{
for (i=0; i<count/8; i++)
((word64*)buf)[i] ^= ((word64*)mask)[i];
count -= 8*i;
if (!count)
return;
buf += 8*i;
mask += 8*i;
}
#endif
for (i=0; i<count/4; i++)
((word32*)buf)[i] ^= ((word32*)mask)[i];
count -= 4*i;
if (!count)
return;
buf += 4*i;
mask += 4*i;
}
for (i=0; i<count; i++)
buf[i] ^= mask[i];
}
void xorbuf(byte *output, const byte *input, const byte *mask, size_t count)
{
if (((size_t)output | (size_t)input | (size_t)mask | count) % WORD_SIZE == 0)
XorWords((word *)output, (const word *)input, (const word *)mask, count/WORD_SIZE);
else
size_t i;
if (IsAligned<word32>(output) && IsAligned<word32>(input) && IsAligned<word32>(mask))
{
for (unsigned int i=0; i<count; i++)
output[i] = input[i] ^ mask[i];
#if defined(WORD64_AVAILABLE) && !defined(CRYPTOPP_SLOW_WORD64)
if (IsAligned<word64>(output) && IsAligned<word64>(input) && IsAligned<word64>(mask))
{
for (i=0; i<count/8; i++)
((word64*)output)[i] = ((word64*)input)[i] ^ ((word64*)mask)[i];
count -= 8*i;
if (!count)
return;
output += 8*i;
input += 8*i;
mask += 8*i;
}
#endif
for (i=0; i<count/4; i++)
((word32*)output)[i] = ((word32*)input)[i] ^ ((word32*)mask)[i];
count -= 4*i;
if (!count)
return;
output += 4*i;
input += 4*i;
mask += 4*i;
}
for (i=0; i<count; i++)
output[i] = input[i] ^ mask[i];
}
#if !(defined(_MSC_VER) && (_MSC_VER < 1300))