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Alexandros Lamprineas 24ecb58ca9 [ARM] Basic bfloat support
This patch adds basic support for BFloat in the Arm backend.
For now the code generation relies on fullfp16 being present.

Briefly:
* adds the bfloat scalar and vector types in the necessary register classes,
* adjusts the calling convention to cope with bfloat argument passing and return,
* adds codegen patterns for moves, loads and stores.

It's tested mostly by the intrinsic patches that depend on it (load/store, convert/copy).

The following people contributed to this patch:

 * Alexandros Lamprineas
 * Ties Stuij

Differential Revision: https://reviews.llvm.org/D81373
2020-06-18 17:26:24 +01:00
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