From: lkcl <lkcl@web>
Date: Sun, 10 Jul 2022 19:25:59 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~1221
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e5e0d5e89990367b9e0263278f9a2bdc81b77e79;p=libreriscv.git

---

diff --git a/openpower/sv/remap.mdwn b/openpower/sv/remap.mdwn
index 0db2918f0..0b6f1af11 100644
--- a/openpower/sv/remap.mdwn
+++ b/openpower/sv/remap.mdwn
@@ -312,7 +312,10 @@ Fields:
 
 *Note: SVd, like SVxd, SVyz and SVzd of `svshape`, are all stored
 "off-by-one".  In the assembler
-mnemonic the values `1-32` are stored in binary as `0b00000..0b11111`*
+mnemonic the values `1-32` are stored in binary as `0b00000..0b11111`*.
+
+*Note: when `yx=1,sk=0` the second dimension is calculated as
+`CEIL(MAXVL/SVd)`*.
 
 When `mm=0`:
 
@@ -384,7 +387,9 @@ whilst `mm=1` is intended to be a little more refined.
 * **Modulo 1D mapping**: to perform Indexing cycling through the
  first N Indices use `SVd=N,sk=0,yx=0` where `VL>N`. There is
  no requirement to set VL equal to a multiple of N.
- 
+* **Modulo 2D transposed**: `SVd=M,sk=0,yx=1`, sets
+ `xdim=M,ydim=CEIL(MAXVL/M)`.
+
 Beyond these mappings it becomes necessary to write directly to
 the SVSTATE SPRs manually.