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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				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
D (DP float)	upstream	upstream					upstream				upstream
Q (QP float)			upstream				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
Zifencei	upstream	upstream	upstream				not supported		upstream	upstream
Machine ISA: CSRs
Machine ISA: ECALL, EBREAK
Machine ISA: MRET/SRET/URET
Machine ISA: WFI
Machine ISA: PMP
Supervisor ISA: CSRs
Supervisor ISA: SFENCE.VMA
Supervisor ISA: Sv32, Sv39, Sv48

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Extension	Spike	Qemu	Binutils	GCC	glibc	newlib	LLVM	OpenSBI	FreeBSD	Linux kernel	GDB
Zihintpause			upstream				not supported

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Extension	Spike	Qemu	Binutils	GCC	glibc	newlib	LLVM	OpenSBI	Linux kernel
Vector: Zvamo, Zvlsseg, Zvediv, Zvqmac, Zve32x, Zve32f, Zve64x, Zve64f, Zve64d, Zvfh, Zve	n	upstream	upstream (but v0.7.1)					upstream (experimental,FP16 ABI not settled)
Bitmanip: Zba, Zbb, Zbc, Zbs	n		Mailpatch (Zba, Zbb, Zbs, Zbp)	PR	dev branch			upstream (experimental)
FP in INT regs: Zfinx	staging branch	staging branch	staging branch	staging-branch			PR
Half Width FP: Zfh, Zfhmin							upstream
ePMP: Smepmp
Scalar crypto: Zbkb, Zbkc, Zbkx, Zknd, Zkne, Zknh, Zksed, Zksh, Zkn, Zks, Zkt, Zk, Zkr			PR	PR			MC layer PR LLVM Intrinsic PR
Priv 1.12: Sm1-12, Ss1-12, Sv57
CMO base: Zicbom, Zicbop, Zicboz
Hypervisor: H	upstream	upstream	dev branch	n/a	n/a	n/a		upstream	KVM patches on LKML
State Enable: Smstateen
Time compare: Sstc
Counter overflow and filtering: Sscofmpf
Fast TLP invalidation: Svinval
NAPOT pages: Svnapot
Page-based memory types: Svpbmt
Code Size Reduction: Zcee
Packed SIMD: Zpn, Zpsfoperand, Zprvsfextra
Resumable Non-maskable Interrupts: Smrnmi
Core-local Interrupt Controller: CLINT
Advanced Core-local Interrupt Controller: ACLINT
Zmmul
Pointer masking: Zjpm

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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

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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

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