From: lkcl <lkcl@web>
Date: Sat, 29 Apr 2023 12:29:39 +0000 (+0100)
Subject: (no commit message)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=46f376fe7572acf0e6342459cff3bad107bf1971;p=libreriscv.git

---

diff --git a/openpower/sv/twin_butterfly.mdwn b/openpower/sv/twin_butterfly.mdwn
index f6d3882eb..69fde8b5d 100644
--- a/openpower/sv/twin_butterfly.mdwn
+++ b/openpower/sv/twin_butterfly.mdwn
@@ -11,6 +11,13 @@
 
 # Rationale for Twin Butterfly Integer DCT Instruction(s)
 
+The number of general-purpose uses for DCT is huge. The
+number of instructions needed instead of these Twin-Butterfly
+instructions is also huge (**eight**) and given that it is
+extremely common to explicitly loop-unroll them quantity
+hundreds to thousands of instructions are dismayingly common
+(for all ISAs).
+
 The goal is to implement instructions that calculate the expression:
 
 ```