From 1deda3364b7cbd80096b7d91f33ecc0336b0f3a5 Mon Sep 17 00:00:00 2001
From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sun, 18 Sep 2022 20:18:49 +0100
Subject: [PATCH] add new svstep mode setting up pack/unpack in simplev.mdwn
 pseudocode

---
 openpower/isa/simplev.mdwn | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/openpower/isa/simplev.mdwn b/openpower/isa/simplev.mdwn
index 8572d690..111212f8 100644
--- a/openpower/isa/simplev.mdwn
+++ b/openpower/isa/simplev.mdwn
@@ -10,8 +10,14 @@ SVL-Form
 
 Pseudo-code:
 
-    step <- SVSTATE_NEXT(SVi, vf)
-    RT <- [0]*57 || step
+    if SVi[3:4] = 0b11 then
+        # store subvl, pack and unpack in SVSTATE
+        SVSTATE[53] <- SVi[5]
+        SVSTATE[54] <- SVi[6]
+        RT <- [0]*62 || SVSTATE[53:54]
+    else
+        step <- SVSTATE_NEXT(SVi, vf)
+        RT <- [0]*57 || step
 
 Special Registers Altered:
 
-- 
2.30.2