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Code Issues Releases Activity

remove AVX and SSE for CipherBlock XOR

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orignal 2018-11-27 14:33:31 -05:00
parent fcd6eb7801
commit 0c9ebc36d4
1 changed files with 3 additions and 36 deletions
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35
libi2pd/Crypto.h
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@ -108,43 +108,10 @@ namespace crypto
void operator^=(const ChipherBlock& other) // XOR void operator^=(const ChipherBlock& other) // XOR
{ {
if (!(((size_t)buf | (size_t)other.buf) & 0x0F)) // multiple of 16 ? if (!(((size_t)buf | (size_t)other.buf) & 0x03)) // multiple of 4 ?
{ {
// try 128 bits if applicable
#ifdef __AVX__
if (i2p::cpu::avx)
{
__asm__
(
"vmovaps (%[buf]), %%xmm0 \n"
"vmovaps (%[other]), %%xmm1 \n"
"vxorps %%xmm0, %%xmm1, %%xmm0 \n"
"vmovaps %%xmm0, (%[buf]) \n"
:
: [buf]"r"(buf), [other]"r"(other.buf)
: "%xmm0", "%xmm1", "memory"
);
}
else
#endif
{
#if defined(__SSE__) // SSE
__asm__
(
"movaps (%[buf]), %%xmm0 \n"
"movaps (%[other]), %%xmm1 \n"
"pxor %%xmm1, %%xmm0 \n"
"movaps %%xmm0, (%[buf]) \n"
:
: [buf]"r"(buf), [other]"r"(other.buf)
: "%xmm0", "%xmm1", "memory"
);
#else
// if not we always can cast to uint32_t *
for (int i = 0; i < 4; i++) for (int i = 0; i < 4; i++)
reinterpret_cast<uint32_t *>(buf)[i] ^= reinterpret_cast<const uint32_t *>(other.buf)[i]; reinterpret_cast<uint32_t *>(buf)[i] ^= reinterpret_cast<const uint32_t *>(other.buf)[i];
#endif
}
} }
else else
{ {