From: lkcl <lkcl@web>
Date: Sat, 18 Jun 2022 23:53:54 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~1692
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=5580a75a68ab3499be0239cf94323f2207ceadd5;p=libreriscv.git

---

diff --git a/openpower/sv/svp64_quirks.mdwn b/openpower/sv/svp64_quirks.mdwn
index b24fc6d7c..3d4033ac7 100644
--- a/openpower/sv/svp64_quirks.mdwn
+++ b/openpower/sv/svp64_quirks.mdwn
@@ -463,6 +463,12 @@ of user expectations, particularly for LD/ST where exceptions
 would normally be expected to be raised, Fail-First provides for
 avoidance of those exceptions.
 
+For Hardware implementers, a standard Out-of-Order micro-architecture
+allows for Cancellation of speculatively-executed elements that extended
+beyond the Vector Truncation point.  In-order systems will have a slightly
+harder time and may choose to execute one element only at a time, reducing
+performance as a result.
+
 # OE=1
 
 The hardware cost of Sticky Overflow in a parallel environment is immense.