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Improved comment on xorbuff and GCC's selection of vmovdqa

pull/35/head
Jeffrey Walton 2015-07-28 20:36:22 -04:00
parent 0b8ef06e08
commit ffc5c11555
1 changed files with 3 additions and 2 deletions
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misc.cpp
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@ -16,8 +16,9 @@
NAMESPACE_BEGIN(CryptoPP)
// Vectorization at -O3 requires IsStrictAligned<word64> for GCC 4.8 and above with xorbuf and VerifyBufsEqual.
// Problems have not been experienced for the word32 variant, but it may aoccur in the future.
// Vectorization at -O3 requires IsStrictAligned<word64> for GCC 4.8 and above with xorbuf
// and VerifyBufsEqual. With vectorization, GCC generates a `vmovdqa` instruction. The
// instruction is sensitive to unaligned data due to XMM register use.
void xorbuf(byte *buf, const byte *mask, size_t count)
{