From: lkcl <lkcl@web>
Date: Sun, 13 Dec 2020 16:51:08 +0000 (+0000)
Subject: (no commit message)
X-Git-Tag: convert-csv-opcode-to-binary~1347
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=068b9283df32df61c860802e551a66284df9bbcf;p=libreriscv.git

---

diff --git a/openpower/sv/mv.vec.mdwn b/openpower/sv/mv.vec.mdwn
index 1b6572bec..84687102c 100644
--- a/openpower/sv/mv.vec.mdwn
+++ b/openpower/sv/mv.vec.mdwn
@@ -7,4 +7,20 @@ Basic idea: mv operations where either the src or dest is specifically marked as
      mv.srcvec  r3, r4.vec2
      mv.destvec r2.vec4, r5
 
-TODO: evaluate whether this will fit with [[mv.swizzle]] involved as well.
+TODO: evaluate whether this will fit with [[mv.swizzle]] involved as well
+(yes it probably will)
+
+* when SUBVL=1 (disabled) the mv is a straight vector mv.
+* when SUBVL=2/3/4, mv.vec kicks in.  M=0 is mv.srcvec, M=1 is mv.destvec
+
+mv.srcvec (leaving out elwidths and chop):
+
+    for i in range(VL):
+        regs[rd+i] = regs[rs+i*SUBVL]
+
+mv.destvec (leaving out elwidths and chop):
+
+    for i in range(VL):
+        regs[rd+i*SUBVL] = regs[rs+i]
+
+