riscv_zce

Extension: Zce

• Branch: riscv-zce
• Tracking PR: #113 (view Pull Request and Diff)
• Mailing List:
  • REVIEW ONLY (2023-07-29)

Based On

• Extensions: Complex implications (such like C + F or D)

Feature Description

It outlines what is necessary for actual Zce extension support.

Before	After Expansion
Zce	Zce + Zca + Zcb + Zcmp + Zcmt
Zce + F	Zce + Zca + Zcb + Zcmp + Zcmt + Zcf + F (RV32)
Zce + F	Zce + Zca + Zcb + Zcmp + Zcmt + F (RV64)

Unlike C extension which got debatable, this Zce extension expansion is necessary because it is explicitly stated in the code size reduction specification. It shares one commit (preparation for complex implications).

However, as of this writing, Zcmp and Zcmt extension works are not finished. So, this branch is currently a mockup.