The Open Power ISA: Architecture Compliancy and Future Foundations
summary
Open Power ISA is now managed by the OpenPOWER Foundation and v3.1 adds concrete features: an instruction prefix that enables PC-relative loads and 8‑byte opcodes and opens a large opcode space, new CMD/V SX additions like 32‑byte loads/stores and matrix math assist for MMA, and clear compliance rules. Four compliancy subsets exist from the 129‑instruction scalar fixed‑point subset up to 1419 total instructions for full capability. Optional features must be implemented in full; a custom extensions sandbox allows proprietary opcodes and control bits.
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