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Needed for #1819 and unfortunately Windows does not allow thread local
data to be stored as a member of a DLL exported class. So hide it
behind an accessor function instead.
This slows down CPUID test somewhat and I would like to address that
but it seems hard without breaking the CPUID API, which is for better
or worse public.
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No real bugs, but pointed out some odd constructs and duplicated logic
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It was only needed for one case which is easily hardcoded. Include
rotate.h in all the source files that actually use rotr/rotl but
implicitly picked it up via loadstor.h -> bswap.h -> rotate.h include
chain.
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Closes GH #1557
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The problem with asm rol/ror is the compiler can't schedule effectively.
But we only need asm in the case when the rotation is variable, so distinguish
the two cases. If a compile time constant, then static_assert that the rotation
is in the correct range and do the straightforward expression knowing the compiler
will probably do the right thing. Otherwise do a tricky expression that both
GCC and Clang happen to have recognize. Avoid the reduction case; instead
require that the rotation be in range (this reverts 2b37c13dcf).
Remove the asm rotations (making this branch illnamed), because now both Clang
and GCC will create a roll without any extra help.
Remove the reduction/mask by the word size for the variable case. The compiler
can't optimize that it out well, but it's easy to ensure it is valid in the callers,
especially now that the variable input cases are easy to grep for.
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ISO C++ reserves names with double underscores in them
Closes #512
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Remove NEON support, replace macros with inlines
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