a0b6cfd975
This adds assembler/disassembler support for XSfmmbase 0.6 and related SiFive matrix multiplication extensions based on the spec here https://www.sifive.com/document-file/xsfmm-matrix-extensions-specification Functionality-wise, this is the same as the Zvma extension proposal that SiFive shared with the Attached Matrix Extension Task Group. The extension names and instruction mnemonics have been changed to use vendor prefixes. Note this is a non-conforming extension as the opcodes used here are in the standard opcode space in OP-V or OP-VE. --------- Co-authored-by: Brandon Wu <brandon.wu@sifive.com>