Skip to content
This repository has been archived by the owner on Feb 29, 2024. It is now read-only.

issue 221 - remove Zcf for RV64 #223

Merged
merged 1 commit into from
Jul 12, 2023
Merged

issue 221 - remove Zcf for RV64 #223

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
19 changes: 11 additions & 8 deletions Zc-specification/Zc.adoc
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
:sectnums:
:version-label: v1.0.3-1
:lifecycle-state: frozen
:version-label: v1.0.4
:lifecycle-state: ratified

[#Zc]
== Zc* {version-label}
Expand All @@ -11,6 +11,7 @@
[width="100%",options=header]
|====================================================================================
|Version | change
|v1.0.4 | Resolve https://github.com/riscv/riscv-code-size-reduction/issues/221 - Zcf doesn't exist on RV64 as it contains no instructions
|v1.0.3-1 | Replace statement about non-idempotent memory handler completing the sequence (non-normative)
|v1.0.3 | Add definition of Zce
|v1.0.2 | Fix Architecture Review Committee feedback on instruction formats
Expand Down Expand Up @@ -52,10 +53,10 @@ Zcm* all reuse the encodings for _c.fld_, _c.fsd_, _c.fldsp_, _c.fsdsp_.
7+|*The Zca extension is added as way to refer to instructions in the C extension that do not include the floating-point loads and stores*
|C excl. c.f* |yes | | | | |
7+|*The Zcf extension is added as a way to refer to compressed single-precision floating-point load/stores*
|c.flw | |yes | | | |
|c.flwsp | |yes | | | |
|c.fsw | |yes | | | |
|c.fswsp | |yes | | | |
|c.flw | |rv32 | | | |
|c.flwsp | |rv32 | | | |
|c.fsw | |rv32 | | | |
|c.fswsp | |rv32 | | | |
7+|*The Zcd extension is added as a way to refer to compressed double-precision floating-point load/stores*
|c.fld | | |yes | | |
|c.fldsp | | |yes | | |
Expand Down Expand Up @@ -91,8 +92,10 @@ Zcm* all reuse the encodings for _c.fld_, _c.fsd_, _c.fldsp_, _c.fsdsp_.

The Zce extension is intended to be used for microcontrollers, and includes all relevant Zc extensions.

* Specifying Zce without F includes Zca, Zcb, Zcmp, Zcmt
* Specifying Zce with F includes Zca, Zcb, Zcmp, Zcmt _and_ Zcf
* Specifying Zce on RV32 without F includes Zca, Zcb, Zcmp, Zcmt
* Specifying Zce on RV32 with F includes Zca, Zcb, Zcmp, Zcmt _and_ Zcf
* Specifying Zce on RV64 always includes Zca, Zcb, Zcmp, Zcmt
** Zcf doesn't exist for RV64

Therefore common ISA strings can be updated as follows to include the relevant Zc extensions, for example:

Expand Down