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These are best left to the user to set via CXXFLAGS or --cc-abi-flags
Add override if arch ends in in {eb, el, be, le} to set the endian.
Avoids an extra file for ppc64le.
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This previously enabled doing something unsafe (misaligned reads),
but it turns out even on hardware that supports this, it is not
safe to do because the compiler may do something unfortunate.
Now memcpy is used, which is safe on any platform.
Should provide a noticable speedup for ARM and PPC64, which previously
used the byte-at-a-time fallback code.
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compiler and target platform might support it. For instance the AES
SSSE3 code is now always in any x86 build, with just that specific
file being compiled with -mssse3. Since we'll only call that code if
cpuid confirms it works at runtime, we don't have portability issues,
and it can be safely included in generic builds (eg for distributions).
Tweak how machine specific compiler flags are generated to be a bit
easier to maintain.
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experimental Debian port), and add aliases for ARM to match the Debian
architectures.
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