From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sun, 8 Apr 2018 00:41:30 +0000 (+0100)
Subject: add P-Ext ISA
X-Git-Tag: convert-csv-opcode-to-binary~5725
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c2c40ae5192e360bc1f274b7f3d11a3c5bf18c15;p=libreriscv.git

add P-Ext ISA
---

diff --git a/simple_v_extension.mdwn b/simple_v_extension.mdwn
index 6ce5586be..b3fcc8362 100644
--- a/simple_v_extension.mdwn
+++ b/simple_v_extension.mdwn
@@ -584,6 +584,19 @@ translates effectively to:
 | KCRSA16 rt, ra, rb | Signed Saturating Cross Sub & Add   | |
 | UKCRSA16 rt, ra, rb| Unsigned Saturating Cross Sub & Add | |
 
+## 8-bit Arithmetic
+
+| Mnemonic           | 16-bit Instruction        | Simple-V Equivalent |
+| ------------------ | ------------------------- | ------------------- |
+| ADD8 rt, ra, rb    | add                       | RV ADD (bitwidth=8)|
+| RADD8 rt, ra, rb   | Signed Halving add        | |
+| URADD8 rt, ra, rb  | Unsigned Halving add      | |
+| KADD8 rt, ra, rb   | Signed Saturating add     | |
+| UKADD8 rt, ra, rb  | Unsigned Saturating add   | |
+| SUB8 rt, ra, rb    | sub                       | RV SUB (bitwidth=8)|
+| RSUB8 rt, ra, rb   | Signed Halving sub        | |
+| URSUB8 rt, ra, rb  | Unsigned Halving sub      | |
+
 
 
 # References