From: lkcl <lkcl@web>
Date: Sat, 4 Jun 2022 15:15:17 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~1986
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a2e2d5d090d03d2e1cdbc8b9f995a54c32e1aecf;p=libreriscv.git

---

diff --git a/openpower/sv/remap.mdwn b/openpower/sv/remap.mdwn
index bf4ef79f9..ab17b3c91 100644
--- a/openpower/sv/remap.mdwn
+++ b/openpower/sv/remap.mdwn
@@ -198,20 +198,22 @@ pipeline overlaps.  Out-of-order / Superscalar micro-architectures with
 register-renaming will have an easier time dealing with this than
 DSP-style SIMD micro-architectures.
 
-## svstate instruction
+## svshape instruction
 
-Please note: this is **not** intended for production.  It sets up
-(overwrites) all required SVSHAPE SPRs and indicates that the
-*next instruction* shall have those REMAP shapes applied to it,
-assuming that instruction is of the form FRT,FRA,FRC,FRB.
+`svshape` is a convenience instruction that reduces instruction
+count for common usage patterns, particularly Matrix, DCT and FFT. It sets up
+(overwrites) all required SVSHAPE SPRs and also modifies SVSTATE
+including VL and MAXVL. Using `svshape` therefore does not also
+require `setvl`.
 
 Form: SVM-Form SV "Matrix" Form (see [[isatables/fields.text]])
 
+    svshape SVxd,SVyd,SVzd,SVRM,vf
+
 | 0.5|6.10  |11.15  |16..20 | 21..25 | 25 | 26..30 |31|  name    |
 | -- | --   | ---   | ----- | ------ | -- | ------ |--| -------- |
 |OPCD| SVxd | SVyd  | SVzd  | SVRM   | vf | XO     |/ | svstate  |
 
-
 Fields:
 
 * **SVxd** - SV REMAP "xdim"