The Gentoo folks caught a bug at https://bugs.gentoo.org/689162. The 689162 bug uses -march=bdver1 -msse4.1 on a AMD Bulldozer machine.
Investigating the issue we are missing the XOP header blake2b_simd.cpp. However, adding the XOP header is not enough for this particular config. Four source files fail to compile with the expected headers. We are waiting on the GCC folks to get back to us with a fix.
Use PowerPC unaligned loads and stores with Power8. Formerly we were using Power7 as the floor because the IBM POWER Architecture manuals said unaligned loads and stores were available. However, some compilers generate bad code for unaligned loads and stores using `-march=power7`, so bump to a known good.
The ParameterBlocks for BLAKE2 had undefined behavior. We relied on the compiler packing the bytes in the structure, then we used the first byte as the start of an array.
This rewrite does things correctly. We don't memset the structure, and we don't treat the structure as a contiguous array.
