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An overview of the current status of unratified extensions can be found here: Opcode and State Review

Extension / feature	Ratified?	Spike	Qemu	Binutils	GCC	glibc	newlib	LLVM	OpenSBI	Linux
RV32I v2.1	y	mainline	mainline	mainline	mainline	mainline	mainline	mainline		mainline
RV64I v2.1	y	mainline	mainline	mainline	mainline	mainline	mainline	mainline		mainline
Big-endian support	y				mainline
RV32E v1.9	n				mainline			not supported		not supported
Zifencei v2.0	y								n/a
Zicsr v2.0	y
M v2.0	y
A v2.1	y	mainline	mainline	mainline	mainline (
F v2.2	y
D v2.2	y
C v2.0	y	mainline	mainline
Q v2.2	y
RVWMO v2.0	y	mainline (emulation is seq. consistent)	mainline (emulation is seq. consistent)
Ztso v0.1	n
Zam v0.1	n
Machine ISA v1.11 (CSRs, ECALL, EBREAK, MRET/SRET/URET, WFI, Reset, NMIs, PMAs, PMP)	y	mainline	mainline
Supervisor ISA v1.11 (CSRs, SFENCE.VMA, Sv32/Sv39/Sv48)	y	mainline	mainline
ABIs (ILP32, ILP32E, ILP32F, ILP32D, LP64, LP64f, LP64D, LP64Q)	y			ilp32, ilp32d, lp64, lp64d	ilp32, ilp32d, lp64, lp64d	ilp32, ilp32d, lp64, lp64d		ilp32, ilp32d, lp64, lp64d
Experimental ABIs

mainline...SW support has been merged into the main development branch of the corresponding SW project

n/a...not applicable, not relevant or not required

empty cells...unknown status (feel free to share your knowledge)

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