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RISC-V Instruction Set Manual, Volume I: RISC-V User-Level ISA , riscv-isa-release-1239329-2023-05-23-96-g1ee25e1 2023/09/27

1. "P" Standard Extension for Packed-SIMD Instructions, Version 0.2

Discussions at the 5th RISC-V workshop indicated a desire to drop this packed-SIMD proposal for floating-point registers in favor of standardizing on the V extension for large floating-point SIMD operations. However, there was interest in packed-SIMD fixed-point operations for use in the integer registers of small RISC-V implementations. A task group is working to define the new P extension.