From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sun, 18 Sep 2022 19:18:49 +0000 (+0100)
Subject: add new svstep mode setting up pack/unpack
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=1deda3364b7cbd80096b7d91f33ecc0336b0f3a5;p=openpower-isa.git

add new svstep mode setting up pack/unpack
in simplev.mdwn pseudocode
---

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: