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[RISCV] Add vendor-defined XTHeadBs (single-bit) extension
The vendor-defined XTHeadBs (predating the standard Zbs extension) extension adds a bit-test instruction (th.tst) with similar semantics as bexti from Zbs. It is supported by the C9xx cores (e.g., found in the wild in the Allwinner D1) by Alibaba T-Head. The current (as of this commit) public documentation for XTHeadBs is available from: https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.2.2/xthead-2023-01-30-2.2.2.pdf Support for these instructions has already landed in GNU Binutils: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=8254c3d2c94ae5458095ea6c25446ba89134b9da Reviewed By: craig.topper Differential Revision: https://reviews.llvm.org/D143036
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