Made fixes to generic_ops-inl.h BitShuffle impl on big-endian

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Performance-portable, length-agnostic SIMD with runtime dispatch

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Made fixes to generic_ops-inl.h BitShuffle impl on big-endian #2232

Closed johnplatts closed 4 months ago

johnplatts commented 4 months ago

Fixed the default BitShuffle implementation on big-endian targets in generic_ops-inl.h, which fixes bugs with BitShuffle on EMU128 on big-endian.

The behavior of BitShuffle in generic_ops-inl.h now matches the behavior of BitShuffle in ppc_vsx-inl.h on big-endian PPC/Z14 with the fixes in this pull request.

TestAllBitShuffle now passes on big-endian EMU128 with the fixes in this pull request.