From 9ffff8ae50af68d7cfccceabc4a17b4255b70d03 Mon Sep 17 00:00:00 2001
From: Tariq Kurd <59061376+tariqkurd-repo@users.noreply.github.com>
Date: Mon, 23 Oct 2023 08:52:17 +0100
Subject: [PATCH 1/2] 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>
---
 Zc-specification/Zc.adoc | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Zc-specification/Zc.adoc b/Zc-specification/Zc.adoc
index 4bd996b..391f120 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 +121,22 @@ 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
+
+If all the instructions from the C extension are present, and the MISA CSR, has been implemented, then MISA.C is set. This happens 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
+
+Therefore MISA.C can be set without directly specifying the C extension.
+
+Specifying Zce sets MISA.C if D is not implemented. If D _is_ implemented then Zce does _not_ set MISA.C as it cannot include Zcd because some of the encodings have been repurposed by Zcmp and Zcmt.
+
 [#Zca]
 === Zca
 

From 00c281cd8c42e18a5891135b2afeb89131f29844 Mon Sep 17 00:00:00 2001
From: Tariq Kurd <59061376+tariqkurd-repo@users.noreply.github.com>
Date: Wed, 25 Oct 2023 14:28:23 +0100
Subject: [PATCH 2/2] simplify the text

Signed-off-by: Tariq Kurd <59061376+tariqkurd-repo@users.noreply.github.com>
---
 Zc-specification/Zc.adoc | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/Zc-specification/Zc.adoc b/Zc-specification/Zc.adoc
index 391f120..41255bc 100644
--- a/Zc-specification/Zc.adoc
+++ b/Zc-specification/Zc.adoc
@@ -124,7 +124,7 @@ Therefore common ISA strings can be updated as follows to include the relevant Z
 [#misaC]
 === MISA.C
 
-If all the instructions from the C extension are present, and the MISA CSR, has been implemented, then MISA.C is set. This happens if the following extensions are selected:
+MISA.C is set if the following extensions are selected:
 
 * Zca and not F
 * Zca, Zcf and F is specified (RV32 only)
@@ -133,10 +133,6 @@ If all the instructions from the C extension are present, and the MISA CSR, has
 * Zca, Zcd if D is specified (RV64 only)
 ** this configuration excludes Zcmp, Zcmt
 
-Therefore MISA.C can be set without directly specifying the C extension.
-
-Specifying Zce sets MISA.C if D is not implemented. If D _is_ implemented then Zce does _not_ set MISA.C as it cannot include Zcd because some of the encodings have been repurposed by Zcmp and Zcmt.
-
 [#Zca]
 === Zca