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The vendor-defined XTHeadMAC (no comparable standard extension exists at the time of writing) extension adds multiply accumulate instructions. 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 this extension is available at: 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=4041e11db3ec3611921d10150572a92689aa3154 Co-authored-by: Philipp Tomsich <philipp.tomsich@vrull.eu> Reviewed By: craig.topper Differential Revision: https://reviews.llvm.org/D143847