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Workaround for __BIGGEST_ALIGNMENT__ on Clang

Michael Kuron requested to merge alignment into master

On x86_64,__BIGGEST_ALIGNMENT__ is always 128 bits, rendering it incompatible with AVX. GCC reports the maximum enabled vector width (which is what we want) and Intel reports the maximum supported vector width (which is okay too).

Reported by @RudolfWeeber. Corresponding LLVM bug report at

Edited by Michael Kuron

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