RISC-V International
This page gives an overview of the extension and feature support in the RISC-V SW ecosystem.
Table of Contents |
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Certain extensions are generated by individual TGs.
An overview of the current status of unratified extensions can be found here: Opcode and State Review
The subsections below contain tables that summarize the current state of extensions and features. The following description helps to interpret the table cell's contents:
This is just a summary of the naming convention as defined in the unpriv specification.
ISA extension description example: RV64I1p0M1p0A1p0F1p0D1p0 or RV32I2_M2_A2 (P extension requires underscore!)
Prefixes:
The table below lists the status of the extensions and features of above listed published extensions.
Extension | Extension / feature | Ratified? | HW exists (see also here)? | FPGA exists?Spike | Qemu | Binutils | GCC | glibc | newlib | LLVM | OpenSBI | FreeBSD | Linux kernel | GDB | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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RV32I | v2.1y | e.g. LowFive | e.g. Rocket | mainline | mainline | mainline | mainline | mainline | mainline | mainline | mainline | mainline | RV64I v2.1 | y | e.g. BeagleV | e.g. Rocket | mainline | mainline | mainline | mainline | mainline | mainline | mainline | mainline | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | not supported | upstream | upstream | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
RV64I | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstreammainline | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Big-endian support | y | mainline | mainline | RV32E v1.9 | n | mainline | upstream | upstream | not supported | not supported | upstream | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
M (Multiplication and Division) | v2.0y | e.g. BeagleV | e.g. Rocket | mainline | mainline | mainline | mainline | upstream | upstream | upstream | upstream | n/a | n/a | upstream | n/a | mainline | n/a | n/a | upstream | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
A (Atomic) | v2.1y | e.g. BeagleV | e.g. Rocket | mainline | mainline | mainline | upstream | upstream | upstream | upstreammainline | n/a | n/a | mainline | mainlineupstream | upstream (atomics) | upstream (atomics) | mainlineupstream (atomics) | upstream | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
F (SP float) | v2.2upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | y | e.g. BeagleV | e.g. Rocket | mainline | mainline | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
D (DP float) | v2.2y | mainline | mainline | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | upstream | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Q (QP float) | upstream | not supported | not supported | upstream | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
RVWMO | upstream | RVWMO v2.0 | y | e.g. BeagleV | e.g. Rocket | mainline (emulation is seq. consistent)mainline | upstream (emulation is seq. consistent) | n/a | n/a | n/a | n/a | n/a | mainlineupstream (barriers and locks) | upstream (barriers and locks) | mainlineupstream (barriers and locks), but needs optimization | upstream | ABIs (ILP32, ILP32E, ILP32F, ILP32D, LP64, LP64f, LP64D, LP64Q) | Documented ABIs | ilp32, ilp32f, ilp32d, ilp32q, ilp32e, lp64, lp64f, lp64d, lp64q | ilp32, ilp32f, ilp32d, ilp32e, lp64, lp64f, lp64d | ilp32, ilp32d, lp64, lp64d | ilp32, ilp32f, ilp32d, ilp32e, lp64, lp64f, lp64d | ilp32, ilp32d, lp64, lp64d | n/a | n/a | C (compressed) v2.0 | y | e.g. EH2 | mainline | mainline | mainline | mainline | n/a | n/a | mainline | Q (QP float) v2.2 | y | mainline | Zifencei v2.0 | y | e.g. EH2 | mainline | mainline | mainline | mainline | Zihintpause v1.0 | mainline | Zicsr v2.0 | y | e.g. EH2 | mainline | mainline | mainline | mainline | Counters v2.0 | n | mainline | mainline | n/a | n/a | n/a | mainline | mainline | Machine ISA v1.11 (CSRs, ECALL, EBREAK, MRET/SRET/URET, WFI, Reset, NMIs, PMAs, PMP) | y | mainline | mainline | n/a | Supervisor ISA v1.11 (CSRs, SFENCE.VMA, Sv32/Sv39/Sv48) | y | mainline | mainline | n/a | B (bitmanip) v0.92 (Zba, Zbb, Zbc, Zbe, Zbf, Zbk, Zbp, Zbr, Zbs) | n | e.g. PR for Rocket, | PR | dev branch | K (scalar crypto) | n | PR | PR | P (SIMD) v0.9.4 | n | mainline (but v0.9.2!) | PR | PR | V (vector) v0.10, Vector Extension Intrinsics, Vector Calling Convention | n | z.B. Allwinner D1 (but v0.7.1) | mainline | mainline (but v0.7.1) | mainline (Zvlsseg API not settled, FP16 ABI not settled) | Ztso v0.1 | n | Zam v0.1 | n | H (hypervisor) v0.6.1 | n | e.g. Rocket | mainline | mainline | dev branch|
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) |
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: Zve32x, Zve32f, Zve64x, Zve64f, Zve64d, Zvl*b, V | 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, Zdinx, Zhinx, Zhinxmin | PR | upstream | upstream (Zfinx, Zdinx, Zhinx, Zhinxmin and unratified Zqinx) | MC upstream | not supported | ||||||
Half Width FP: Zfh, Zfhmin | upstream | upstream | upstream | upstream | not supported | ||||||
ePMP: Smepmp | upstream | upstream(but 0.9.3) | upstream | PR | not supported | ||||||
Scalar crypto: Zbkb, Zbkc, Zbkx, Zknd, Zkne, Zknh, Zksed, Zksh, Zkr, Zkt, Zkn, Zks, Zk | 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 | dma-ops upstream (6.0) | |||||
Hypervisor: (H) | upstream | upstream | upstream | n/a | n/a | n/a |
mainline...SW support has been merged into the main development branch of the corresponding SW project
staging branch...SW support lives in a staging branch and is not mainlined
PR...SW support exists in form of a pull request for mainline (in-review or waiting for ratification)
n/a...not applicable, not relevant, or not required
missing...currently no known implementation
dev:X...feature is in development by X
empty cells...unknown status (feel free to share your knowledge)
E.g.: RV64I1p0M1p0A1p0F1p0D1p0 or RV32I2_M2_A2 (P extension requires underscore!)
The complete ISA extension naming convention can be found in the unpriv specification.
...
upstream | not supported | upstream (5.16) | |||||||||
State Enable: Smstateen | upstream | Mailpatch | upstream | not supported | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Time compare: Sstc | Mailpatch | upstream | not supported | ||||||||
Counter overflow and filtering: Sscofmpf | PR | Mailpatch | upstream | not supported | |||||||
Fast TLP invalidation: Svinval | upstream | upstream | upstream | not supported | |||||||
NAPOT pages: Svnapot | upstream | upstream | upstream | not supported | |||||||
Page-based memory types: Svpbmt | upstream | upstream | upstream | not supported | upstream (5.19) | ||||||
Core-local Interrupt Controller: CLINT | upstream | upstream | upstream | upstream (clocksource) | |||||||
Zmmul | upstream | upstream | upstream | Mailpatch | patch | n/a |
Extensions and features in the table below are either frozen or ready-for-ratification.
Extension | Spike | Qemu | Binutils | GCC | glibc | newlib | LLVM | OpenSBI | FreeBSD | Linux kernel | GDB |
---|---|---|---|---|---|---|---|---|---|---|---|
Code Size Reduction: Zca, Zcf, Zcd, Zcb, Zcmp, Zcmt | dev branch | dev branch | dev branch | dev branch | dev branch | not supported |
Note, that this section only lists specifications that are planned to be released in the near future, but are not frozen yet.
Extension | Spike | Qemu | Binutils | GCC | glibc | newlib | LLVM | OpenSBI | FreeBSD | Linux kernel | GDB |
---|---|---|---|---|---|---|---|---|---|---|---|
psABI: Standard ABIs: ILP32, ILP32F, ILP32D, LP64, LP64F, LP64D, LP64Q | n/a | n/a | upstream | ilp32, ilp32f, ilp32d, lp64, lp64f, lp64d | ilp32, ilp32d, lp64, lp64d | ilp32, ilp32f, ilp32d, lp64, lp64f, lp64d | ilp32, ilp32d, lp64, lp64d | n/a | lp64, lp64d | n/a |
Note that this section only exists for historical purposes and the table below is not considered complete. Further, there are no attempts to track the SW support of unstable features here.
Extension | Spike | Qemu | Binutils | GCC | glibc | newlib | LLVM | OpenSBI | FreeBSD | Linux kernel | GDB |
---|---|---|---|---|---|---|---|---|---|---|---|
Embedded ABI: ILP32E, LP64E | n/a | n/a | upstream | upstream | not supported | upstream | not supported | n/a | n/a | n/a | not supported |
Packed SIMD: Zpn, Zpsfoperand, Zbpbo, P | upstream( v0.9.2) | Mailpatch | PR | not supported | |||||||
Pointer masking: Zjpm | not supported | ||||||||||
Resumable Non-maskable Interrupts: Smrnmi | dev branch | not supported | |||||||||
Advanced Core-local Interrupt Controller: ACLINT | upstream | not supported | Patchwork |