From: lkcl <lkcl@web>
Date: Fri, 24 Jun 2022 11:33:43 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~1549
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b48f9a5174c0884a67f3ecf5a4793f3956993f3d;p=libreriscv.git

---

diff --git a/openpower/sv/svstep.mdwn b/openpower/sv/svstep.mdwn
index 8e179abe5..e8ac7f61a 100644
--- a/openpower/sv/svstep.mdwn
+++ b/openpower/sv/svstep.mdwn
@@ -27,14 +27,20 @@ Instruction format:
     svstep RT,SVi,vf  (Rc=0)
     svstep. RT,SVi,vf (Rc=1)
 
+# Description
+
 When `vf=1` then stepping occurs. When `vf=0` svstep may be used
 to enquire about the REMAP Schedule, without altering internal
 state.  If `SVi=0, Rc=0, vf=0` this instruction is a `nop`.
 
-When `SVi` is 1-4 the REMAP Schedule for a given SVSHAPE  may be
+When `SVi` is 1-4 the REMAP Schedule for a given SVSHAPE may be
 returned in `RT`.  SVi=1 selects SVSHAPE0 current state,
 through to SVi=4 selects SVSHAPE3.
 
+* Vertical-First Mode will return the current index
+  (and move to the next if `vf=1`)
+* Horizontal-First Mode can be used to return all indices
+
 To obtain the full set of possible computed element
 indices use `svstep RT.v,SVI,1` which will store all computed element
 indices, starting from RT.  If Rc=1 then a co-result Vector of CR Fields