From: lkcl <lkcl@web>
Date: Tue, 25 Apr 2023 00:13:59 +0000 (+0100)
Subject: (no commit message)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=8385019e5cc8ab54e83a36d8cf99a95b11e0471a;p=libreriscv.git

---

diff --git a/openpower/sv/remap.mdwn b/openpower/sv/remap.mdwn
index 112e9474a..33ef6ed4e 100644
--- a/openpower/sv/remap.mdwn
+++ b/openpower/sv/remap.mdwn
@@ -337,6 +337,10 @@ all *already* critically depend on overlapping Reads/Writes: Matrix
 uses overlapping registers as accumulators.  Thus the Register Hazard
 Management needed by Indexed REMAP *has* to be in place anyway.
 
+*Programmer's Note: `hphint` may be used to help hardware identify
+parallelism opportunities but it is critical to remember that the
+groupings are by `FLOOR(step/MAXVL)` not `FLOOR(REMAP(step)/MAXVL)`.*
+
 The cost compared to Matrix and other REMAPs (and Pack/Unpack) is
 clearly that of the additional reading of the GPRs to be used as Indices,
 plus the setup cost associated with creating those same Indices.