From: lkcl <lkcl@web>
Date: Thu, 9 Jun 2022 09:58:41 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~1901
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=768bdd9f359d46d69bdd1aacc4909a3579275954;p=libreriscv.git

---

diff --git a/openpower/sv/svp64_quirks.mdwn b/openpower/sv/svp64_quirks.mdwn
index 36b56042d..0b967f366 100644
--- a/openpower/sv/svp64_quirks.mdwn
+++ b/openpower/sv/svp64_quirks.mdwn
@@ -375,7 +375,8 @@ combined with the hard requirement to respect full Register Hazard
 Management as if element instructions were actual Scalar instructions,
 the addition of a Vector permute instruction under these strict
 conditions would result in a catastrophic
-reduction in performance.
+reduction in performance, due to having to consider Read-after-Write
+and Write-after-Read Hazards *at the element level*.
 
 A little leniency and rule-bending is therefore required.