RISC-V International
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Overview
- This page only tracks ratified extensions and features that are specified by groups (TGs, HCs) of RISC-V International.
- The extensions and features are grouped by their specification's state (published, ratified, frozen).
- Published (official) specifications can be found here: https://riscv.org/technical/specifications/
- The main repository of the ISA specifications is: https://github.com/riscv/riscv-isa-manual
- The following wiki page lists all recently ratified extensions, that are not merged into the ISA specification yet: Recently Ratified Extensions
- The Specification Status lists lists the specifications that are frozen and or ready for ratification
Table description
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| Extension | Spike | Qemu | Binutils | GCC | glibc | newlib | LLVM | OpenSBI | FreeBSD | Linux kernel | GDB |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RV32I | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | not supported | upstream | upstream |
| RV64I | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream |
| Big-endian support | upstream | upstream | not supported | not supported | upstream | ||||||
| M (Multiplication and Division) | upstream | upstream | upstream | upstream | n/a | n/a | upstream | n/a | n/a | n/a | upstream |
| A (Atomic) | upstream | upstream | upstream | upstream | n/a | n/a | upstream | upstream (atomics) | upstream (atomics) | upstream (atomics) | upstream |
| F (SP float) | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | |
| D (DP float) | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | |
| Q (QP float) | upstream | not supported | not supported | upstream | |||||||
| RVWMO | upstream (emulation is seq. consistent) | upstream (emulation is seq. consistent) | n/a | n/a | n/a | n/a | n/a | upstream (barriers and locks) | upstream (barriers and locks) | upstream (barriers and locks), but needs optimization | upstream |
| C (compressed) | upstream | upstream | upstream | upstream | n/a | n/a | upstream | upstream | upstream | ||
| Zifencei | upstream | upstream | upstream | upstream | not supported | upstream | upstream | ||||
| Machine ISA: CSRs | upstream | upstream | upstream | n/a | |||||||
| Machine ISA: ECALL, EBREAK | upstream | upstream | upstream | upstream | |||||||
| Machine ISA: MRET/SRET/URET | upstream | upstream | n/a | ||||||||
| Machine ISA: WFI | upstream | upstream | upstream | upstream | |||||||
| Machine ISA: PMP | n/a | ||||||||||
| Supervisor ISA: CSRs | upstream | upstream | upstream | ||||||||
| Supervisor ISA: SFENCE.VMA | upstream | upstream | upstream | upstream | |||||||
| Supervisor ISA: Sv32, Sv39, Sv48 | upstream | upstream | Sv39 upstream | upstream (sv39) |
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Extensions and features in the table below are ratified, but not published in a consolidated RISC-V ISA specification document.
| Extension | Spike | Qemu | Binutils | GCC | glibc | newlib | LLVM | OpenSBI | FreeBSD | Linux kernel | GDB |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Zihintpause | upstream | Mailpatch | upstream | upstream | |||||||
| Vector: Zvamo, Zvlsseg, Zvediv, Zvqmac, Zve32x, Zve32f, Zve64x, Zve64f, Zve64d, Zvfh, Zve | upstream | upstream | upstream | rvv-next branch | upstream | upstream (experimental,FP16 ABI not settled) | not supported | ||||
| Bitmanip: Zba, Zbb, Zbc, Zbs | upstream | upstream | upstream | PR | dev branch | upstream | upstream (experimental) | not used | |||
| FP in INT regs: Zfinx |
| PR | upstream | upstream(Zfinx, Zdinx) | MC upstream | not supported | |||||||
| Half Width FP: Zfh, Zfhmin | upstream | upstream | upstream (Zfh only) Mailpatch (Zfhmin) | upstream | not supported | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| ePMP: Smepmp | upstream | upstream(but 0.9.3) | upstream (CSR only; part of Priv 1.12 support) | PR | not supported | ||||||
| Scalar crypto: Zbkb, Zbkc, Zbkx, Zknd, Zkne, Zknh, Zksed, Zksh, Zkn, Zks, Zkt, Zk, Zkr | upstream | upstream | upstream | upstream(only minimal support and wait c-api merge) | upstream | not used | |||||
| Priv 1.12: Sm1-12, Ss1-12, Sv57 | upstream | upstream | not supported | ||||||||
| CMO base: Zicbom, Zicbop, Zicboz | upstream | Mailpatch | upstream | PR,PR | not supported | ||||||
| Hypervisor: H | upstream | upstream | upstream (except handling as 'H' extension; now a part of 'I' extension) | n/a | n/a | n/a | upstream | not supported | upstream (5.16) | ||
| State Enable: Smstateen | upstream | Mailpatch | Mailpatch | not supported | |||||||
| Time compare: Sstc | Mailpatch | Mailpatch | not supported | ||||||||
| Counter overflow and filtering: Sscofmpf | PR | Mailpatch | Mailpatch | not supported | |||||||
| Fast TLP invalidation: Svinval | upstream | upstream | upstream | not supported | |||||||
| NAPOT pages: Svnapot | upstream | upstream | not supported | ||||||||
| Page-based memory types: Svpbmt | upstream | upstream | not supported | ||||||||
| Code Size Reduction: Zcee | dev branch | dev branch | dev branch | dev branch | dev branch | not supported | |||||
| Packed SIMD: Zpn, Zpsfoperand, Zprvsfextra | upstream( v0.9.2) | Mailpatch | PR | PR | not supported | ||||||
| Resumable Non-maskable Interrupts: Smrnmi | not supported | ||||||||||
| Core-local Interrupt Controller: CLINT | upstream | upstream | upstream | upstream (clocksource) | |||||||
| Advanced Core-local Interrupt Controller: ACLINT | upstream | not supported | Patchwork | ||||||||
| Zmmul | upstream |
| upstream | Mailpatch | Mailpatch | patch | n/a | |||||||
| Pointer masking: Zjpm | not supported |
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Specifications that are at least frozen
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