From: lkcl <lkcl@web>
Date: Fri, 11 Dec 2020 23:29:45 +0000 (+0000)
Subject: (no commit message)
X-Git-Tag: convert-csv-opcode-to-binary~1398
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7d915a20aba5babb30cb7a700a450c628419b44e;p=libreriscv.git

---

diff --git a/openpower/sv/sv/mv.swizzle.mdwn b/openpower/sv/sv/mv.swizzle.mdwn
index 8124256c2..1343bc0e6 100644
--- a/openpower/sv/sv/mv.swizzle.mdwn
+++ b/openpower/sv/sv/mv.swizzle.mdwn
@@ -1,2 +1,28 @@
 # mv.swizzle
 
+# Format
+
+| 0..5 |6..10|11..15|16.20|21.....25|26.....30|31|  name   |
+|------|-----|------|-----|---------|---------|--|---------|
+| 19   | RT  | RA   |     | XO[0:4] | XO[5:9] |Rc| XL-Form |
+| 19   | RT  | RA   |imm  | imm     | Nn  NNN |im| mv.swiz |
+
+also f.mv
+
+this gives an 11 bit immediate across bits 16 to 25 and bit 31.  a permutation based encoding should allow the 12 bits to be covered
+
+* 3 bits X
+* 3 bits Y
+* 3 bits Z
+* 3 bits W
+
+except that the options are:
+
+* 0b1NN index 0 thru 3 to place subelement in pos XYZW
+* 0b000 to indicate "skip"
+* 0b001 to indicate "constant 0"
+* 0b010 to indicate "constant 1" (or 1.0)
+* 0b011 is not needed.
+
+this "not needed" means the encoding is actually a lot less.  the sequences involve expressing how many 0s and 1s are embedded in amongst the XYZWs which gets really interesting.
+