From: lkcl <lkcl@web>
Date: Sat, 4 Jun 2022 17:43:13 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~1977
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=cbe97f6f2da0ccca80cad78715495919a09097cf;p=libreriscv.git

---

diff --git a/openpower/sv/shape_table_format.mdwn b/openpower/sv/shape_table_format.mdwn
index 04374e61c..9def0fc8a 100644
--- a/openpower/sv/shape_table_format.mdwn
+++ b/openpower/sv/shape_table_format.mdwn
@@ -100,3 +100,19 @@ In other words, the "permute" option changes the order in which
 nested for-loops over the array would be done.  See executable
 python reference code for further details.
 
+*Note: permute=0b110 and permute=0b111 enable Indexed REMAP Mode,
+described below*
+
+## Indexed Mode
+
+Indexed Mode activates reading of the element indices from the GPR.
+In its simplest form (without elwidth overrides):
+
+```
+def index_remap(i):
+    return GPR(SVSHAPE.SVGPR+i)
+
+for i in 0..VL-1:
+    GPR(RT + indexed_remap(i) + SVSHAPE.offset) = ....
+```
+