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While older versions of GCC did very badly with __builtin_bswap on
ARM, I checked GCC 4.8 and it behaves correctly, emitting either rev
or else the same optimal sequence as was used in the inline asm
(depending on if ARMv7 is enabled or not.)
Enable MSVC byteswap intrinsics, which (hopefully) work on all platforms.
Drop the x86-32 specific asm for byteswap.
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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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It was disabled anyway (bad macro check) and with recent GCC
turned out to be slower than just using bswap.
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ISO C++ reserves names with double underscores in them
Closes #512
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Renames a couple of functions for somewhat better name consistency,
eg make_u32bit becomes make_uint32. The old typedefs remain for now
since probably lots of application code uses them.
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This adds support for 64 bit ARM cores as used in many high-end phones
such as all iPhones beginning with the 5s. While these newer phones
still run 32 bit ARM code, Apple doesn't allow apps to be submitted to
the app store if they don't provide a 64 bit build.
This commit adds a new arm64 arch and renames arm to arm32 to stay
consistent with the other architectures. The name arm can still be used
for configuring because it has been added as an alias for arm32.
Additionally, the one piece of ARM inline assembly that can be found in
Botan doesn't work on 64 bit ARM, so I use the solution that has been
proposed in #180: Use __builtin_bswap32 instead of inline assembly.
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GH #103
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Update license header line to specify the terms and refer to the file,
neither of which it included before.
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