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Add support for BF16 extensions #1321
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I haven't reviewed this yet, but we should wait until the opcode conflict mentioned on riscv/riscv-opcodes#174 is resolved.
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I haven't reviewed the code, or tested the new BF16 instructions, but I've confirmed that it doesn't break anything else.
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This PR tries to add support for BF16 extensions v0.2.1.
The spec can be found in: https://github.com/riscv/riscv-bfloat16.