From: lkcl <lkcl@web>
Date: Mon, 3 Oct 2022 20:16:45 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~218
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c39e86e1a267272b2810dc677a15d3951cf60acb;p=libreriscv.git

---

diff --git a/openpower/sv/rfc/ls002.mdwn b/openpower/sv/rfc/ls002.mdwn
index 888b9c405..23a3d3e02 100644
--- a/openpower/sv/rfc/ls002.mdwn
+++ b/openpower/sv/rfc/ls002.mdwn
@@ -109,7 +109,7 @@ fmvis f4, 0xFF80 # writes -Infinity to f4
 fmvis f4, 0x3FFF # writes +1.9921875 to f4
 ```
 
-# Float Immediate Second-Half Move
+# Floating-Point Immediate Second-Half Move
 
 `fishmv FRS, D`
 
@@ -130,19 +130,22 @@ Special registers altered:
 
     None
 
-Strategically similar to how `oris` is used to construct
-32-bit Integers, an additional 16-bits of immediate is
+An additional 16-bits of immediate is
 inserted into `FRS` to extend its accuracy to
-a full FP32 (stored as usual in FP64 Format within the FPR).
-If a prior `fmvis` instruction had been used to
-set the upper 16-bits from an FP32 value, `fishmv` contains the
-lower 16-bits.
+a full FP32, which is then stored in the usual FP64 Format within the FPR.
 
 **This instruction performs a Read-Modify-Write.** *FRS is read, the
 additional
 16 bit immediate inserted, and the result also written to FRS.
+This is strategically similar to how `li` combined with `oris` is
+used to construct 32-bit Integers.
 `fishmv` may be macro-op-fused with `fmvis`*
 
+Programmer's note:
+If a prior `fmvis` instruction had been used to
+set the upper 16-bits from an FP32 value, `fishmv` may be used
+to set the
+lower 16-bits.
 Example:
 
 ```