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Extensions and features in the table below are either frozen or ready-for-ratification.

ExtensionSpikeQemuBinutilsGCCglibcnewlibLLVMOpenSBIFreeBSDLinux

GDB

Zihintpauseupstreamnot supported

V (vector), Vector Extension Intrinsics, Vector Calling Conventionnupstreamupstream (but v0.7.1)



upstream (experimental,FP16 ABI not settled)



Specifications that are at least stable

ExtensionSpikeQemuBinutilsGCCglibcnewlibLLVMOpenSBIFreeBSDLinux

GDB

Standard ABIs: ILP32, ILP32F, ILP32D, LP64, LP64F, LP64D, LP64Qn/an/aupstreamilp32, ilp32f, ilp32d, lp64, lp64f, lp64dilp32, ilp32d, lp64, lp64dilp32, ilp32f, ilp32d, lp64, lp64f, lp64dilp32, ilp32d, lp64, lp64dn/alp64, lp64dn/a

Specifications that are not stable

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. 

ExtensionSpikeQemuBinutilsGCCglibcnewlibLLVMOpenSBIFreeBSDLinux

GDB

Embedded ABI: ILP32E, LP64En/an/aupstreamupstreamnot supportedupstreamnot supportedn/an/an/anot supported

Gaps

To-do list

This is a temporary subsection that will disappear soon.

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