Highlights

• Scalar Cryptography (Zkn, Zks) Instruction Set Extensions
  The Zkn and Zks RISC-V extensions implement Scalar Cryptography instructions aimed at accelerating the NIST and ShangMi cryptographic standards, respectively. Both these standards describe algorithms for, given input data, encrypting/decrypting the input, as well as computing unique hash values from the input.

• Code Size Reduction (Zcb, Zcmp) Instruction Set Extensions
  The Zcb standard extension provides compressed variants of a number of existing extensions. When this extension is enabled, both the compiler and assembler use those instructions. The Zcmp extension is a set of instructions (including push/pop) that can be executed as a series of existing 32-bit RISC-V instructions.

• Improved code generation for the Bitmanip extensions (rotate)

• Optimized ceil, floor, and round libraries for soft-float and Zfinx

• Support for misaligned data access
  When supported by the core, the compiler can generate code to read and write packed data using large instructions, instead of performing byte-by-byte accesses.

• New compiler GCC extensions
  The following GCC extensions are now supported by the compiler:

  • the __auto_type specifier

  • the format function attribute

  • the warn_unused_result function attribute

  • structures with a flexible array member allowed as an array type

New Devices

• Nuclei
  NA300, U900

• NSITEXE
  NS31A Rev2, NS31 DUL

• WCH
  CH32V003, CH32V203

• ESWIN
  E301, E302, E310, E315, E320, EAM2011

• HPMicro
  HPM5301, HPM5321, HPM5331, HPM5361, HPM6220, HPM6240, HPM6260, HPM6264, HPM6280, HPM6284, HPM6320, HPM6340, HPM6350, HPM6360, HPM6364, HPM6430, HPM6450, HPM6730, HPM6750, HPM6754