[FFmpeg-cvslog] doc: reference the RISC-V specification

[Rémi Denis-Courmont]

ffmpeg | branch: master | Rémi Denis-Courmont <remi at remlab.net> | Mon Sep 12 18:53:16 2022 +0300| [092ce9712f63fc2641ec831d09c8ca0731083ae4] | committer: James Almer

doc: reference the RISC-V specification

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=092ce9712f63fc2641ec831d09c8ca0731083ae4
---

 doc/optimization.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/doc/optimization.txt b/doc/optimization.txt
index 974e2f9af2..3ed29fe38c 100644
--- a/doc/optimization.txt
+++ b/doc/optimization.txt
@@ -267,6 +267,11 @@ CELL/SPU:
 http://www-01.ibm.com/chips/techlib/techlib.nsf/techdocs/30B3520C93F437AB87257060006FFE5E/$file/Language_Extensions_for_CBEA_2.4.pdf
 http://www-01.ibm.com/chips/techlib/techlib.nsf/techdocs/9F820A5FFA3ECE8C8725716A0062585F/$file/CBE_Handbook_v1.1_24APR2007_pub.pdf
 
+RISC-V-specific:
+----------------
+The RISC-V Instruction Set Manual, Volume 1, Unprivileged ISA:
+https://riscv.org/technical/specifications/
+
 GCC asm links:
 --------------
 official doc but quite ugly