From: lkcl <lkcl@web>
Date: Wed, 9 Dec 2020 00:32:05 +0000 (+0000)
Subject: (no commit message)
X-Git-Tag: convert-csv-opcode-to-binary~1461
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a415ac89c48fcf59b1f691cc74cdee26a472256e;p=libreriscv.git

---

diff --git a/openpower/sv/av_opcodes.mdwn b/openpower/sv/av_opcodes.mdwn
index 454daa27a..089644a8f 100644
--- a/openpower/sv/av_opcodes.mdwn
+++ b/openpower/sv/av_opcodes.mdwn
@@ -10,7 +10,9 @@ The fundamental principle for these instructions is:
 
 * identify the scalar primitive
 * assume that longer runs of scalars will have Simple-V vectorisatin applied
-* assume that "swizzle" may be applied at the (vec2 - SUBVL=2) Vector level
+* assume that "swizzle" may be applied at the (vec2 - SUBVL=2) Vector level,
+  in order to perform the necessary HI/LO selection normally hard-coded
+  into SIMD ISAs.
 
 Thus for example, where OpenPOWER VSX has vpkswss, this would be achieved in SV with simply: