From 786f51092bccd93b4a0f0c915408ba2538b85844 Mon Sep 17 00:00:00 2001
From: Tariq Kurd <59061376+tariqkurd-repo@users.noreply.github.com>
Date: Thu, 26 Oct 2023 00:19:22 +0100
Subject: [PATCH] clarify when to set misa.C (#230)

* clarify when to set misa.C

add rules specifying when misa.C is set

Signed-off-by: Tariq Kurd <59061376+tariqkurd-repo@users.noreply.github.com>

* simplify the text

Signed-off-by: Tariq Kurd <59061376+tariqkurd-repo@users.noreply.github.com>

---------

Signed-off-by: Tariq Kurd <59061376+tariqkurd-repo@users.noreply.github.com>
---
 Zc-specification/Zc.adoc | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Zc-specification/Zc.adoc b/Zc-specification/Zc.adoc
index 4bd996b..41255bc 100644
--- a/Zc-specification/Zc.adoc
+++ b/Zc-specification/Zc.adoc
@@ -11,6 +11,7 @@
 [width="100%",options=header]
 |====================================================================================
 |Version  | change
+|v1.0.4-3    | Added misa.C clarification
 |v1.0.4-2    | Added rule that C implies Zca, Zcf, Zcd - discussed in https://github.com/riscv/riscv-isa-manual/issues/1132
 |v1.0.4-1    | Added rule that Zcf implies F and Zcd implies D - discussed in https://github.com/riscv/riscv-code-size-reduction/issues/221
 
@@ -120,6 +121,18 @@ Therefore common ISA strings can be updated as follows to include the relevant Z
 * RV32IMC becomes RV32IM_Zce
 * RV32IMCF becomes RV32IMF_Zce
 
+[#misaC]
+=== MISA.C
+
+MISA.C is set if the following extensions are selected:
+
+* Zca and not F
+* Zca, Zcf and F is specified (RV32 only)
+* Zca, Zcf and Zcd if D is specified (RV32 only)
+** this configuration excludes Zcmp, Zcmt
+* Zca, Zcd if D is specified (RV64 only)
+** this configuration excludes Zcmp, Zcmt
+
 [#Zca]
 === Zca