From: lkcl <lkcl@web>
Date: Fri, 9 Sep 2022 11:57:19 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~559
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=030a18da97c6fa845f15d437ee6aeb844adb36da;p=libreriscv.git

---

diff --git a/openpower/sv/rfc/ls001/discussion.mdwn b/openpower/sv/rfc/ls001/discussion.mdwn
new file mode 100644
index 000000000..28e09abd6
--- /dev/null
+++ b/openpower/sv/rfc/ls001/discussion.mdwn
@@ -0,0 +1,16 @@
+# potential opcode allocations
+
+discussion on ways to allocate scalar and svp64 opcodes
+
+# major old/new scalar/vec
+
+following a similar scheme to EXT001 in Power ISA Public v3.1,
+one bit indicates "this is an entire new 32-bit scalar space"
+
+| 0-5 | 6 | 7 | 8-31 | Description               |
+|-----|---|---|------|---------------------------|
+| PO  | 0 | 0 | nnnn | new, scalar (SVP64Single) |
+| PO  | 1 | 0 | nnnn | old, scalar (SVP64Single) |
+| PO  | 0 | 1 | nnnn | new, vector (SVP64)       |
+| PO  | 1 | 1 | nnnn | old, vector (SVP64)       |
+