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Updating header material for next version after v1.0-rc2 release.
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kasanovic committed Sep 18, 2021
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= RISC-V "V" Vector Extension
Version 1.0-rc2
Version 1.0-draft
:doctype: article
:encoding: utf-8
:lang: en
Expand All @@ -23,54 +23,20 @@ Alex Solomatnikov, Steve Wallach, Andrew Waterman, Jim Wilson.

:sectnums!:

== Changes from v1.0-rc1
== Changes from v1.0-rc2

=== Various clarifications to text, and added rationale for design choices.

=== Renamed `vpopc.m` to `vcpop.m` for consistency with scalar instruction. Keeping old assembler name as alias.

=== For mask-logical instructions, and `vmsbf.m`, `vmsif.m`, `vmsof.m` mask-manipulation instructions, allow implementations to write entire mask register with result (always tail-agnostic)

=== Added vector length extensions "Zvl*".

=== Added clarification of operation of `mstatus.VS` field and interaction with `mstatus.SD`.

=== Added definition of behavior under hypervisor.

=== Clarified checking of illegal values in `vtype`.

=== Made clear that calling convention appendix here is only a placeholder to help understand the examples, with RISC-V psABI being expanded to contain the authoritative calling convention.

=== Clarified the `vxsat` is in bit 0 of the CSR and that upper bits should be written as zeros.

=== Clarified that `vxrm` field is in low two bits of the CSR and that upper bits should be written as zeros.

=== Simplified explanations by removing text refering to option to have one element span multiple vector registers (ELEN {gt} VLEN), as this is not being proposed at this time.

=== Clarified that implementations must raise illegal instruction exception for standard loads and stores with EEWs that are not supported by the implementation.

=== Removed Zvlsseg extension name as segment load/stores are required in all standard vector extensions.

=== Made clear that `nf` is encoded same as NFIELDS when used in whole register load/store instructions.

=== Clarified that instructions with register specifiers that violate register overlap constraints are reserved.

=== Added note to explain how floating-point scalar values would be handled when adding vectors to the Zfinx/Zdinx/Zhinx extensions.

=== The previous assembler mnemonics `vmandnot` and `vmornot` have been changed to `vmandn` and `vmorn` to be consistent with the equivalent scalar instructions. The old `vmandnot` and `vmornot` mnemonics will be retained as aliases in assembler.

=== Stated that `misa.v` is set for implementations supporting the standard V extension.
=== None.

:sectnums:

== Introduction

This document is a draft of the second release candidate for version
1.0 of the RISC-V vector extension for public review.
This document is a draft of version 1.0 of the RISC-V vector extension
for public review.

*This is not the frozen version of 1.0 for public review*.

NOTE: When finally approved and the release candidate tag is removed,
NOTE: When finally approved and the draft tag is removed,
version 1.0 is intended to be sent out for public review as part of
the RISC-V International ratification process. Version 1.0 will also
then be considered stable enough to begin developing toolchains,
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