From: lkcl <lkcl@web>
Date: Mon, 5 Sep 2022 15:10:55 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~677
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=fc5216ff782965f1a7bda9443b4142e7d00bc399;p=libreriscv.git

---

diff --git a/openpower/sv/remap.mdwn b/openpower/sv/remap.mdwn
index 12c1642ff..dbb18875e 100644
--- a/openpower/sv/remap.mdwn
+++ b/openpower/sv/remap.mdwn
@@ -346,6 +346,9 @@ Note that when SVM is clear and SUBVL!=1 a Parallel Reduction is performed
 on all first Subvector elements, followed by another separate independent
 Parallel Reduction on all the second Subvector elements and so on.
 
+    for selectsubelement in (x,y,z,w):
+       parallelreduce(0..VL-1, selectsubelement)
+
 By contrast, when SVM is set and SUBVL!=1, a Horizontal
 Subvector mode is enabled, applying the Parallel Reduction
 Algorithm to the Subvector Elements. The Parallel Reduction
@@ -357,7 +360,8 @@ group is performed or not.
 
       for (i = 0; i < VL; i++)
         if (predval & 1<<i) # predication
-           subvecparallelreduction(...)
+           el = element[i]
+           parallelreduction([el.x, el.y, el.z, el.w])
 
 Note that as this is a Parallel Reduction, for best results
 it should be an overwrite operation, where the result for