Add notes for Cranelift 2021-12-13 meeting

meetings/cranelift/2021/cranelift-12-13.md

@@ -17,4 +17,44 @@
 
 ### Attendees
 
+* Chris Fallin
+* Nick Fitzgerald
+* Alexa VanHattum
+* Ulrich Weigand
+* Anton Kirilov
+* Johnnie Birch
+* Benjamin Bouvier
+
 ### Notes
+
+* Chris Fallin:
+  * project update blog post is out
+  * 2022 roadmap is out, please leave comments / suggestions / feedback on the
+    RFC
+* Nick Fitzgerald:
+  * ISLE porting
+  * wasm-mutate stuff, lots of "good first issue" type stuff if people want to
+    contribute!
+* Alexa VanHattum:
+  * Been looking into verifying ISLE
+  * `iadd`s that compile down into `sub`s
+  * SAIL(sp?) seems easier to work with in aarch64 than x86-64, probably
+    starting there
+* Ulrich Weigand
+  * Looking into ISLE
+* Anton Kirilov
+  * Finished an initial pointer auth impl in aarch64 backend
+  * Going to start working on BTI support
+  * Issues with A vs B keys and unwinder
+  * Current pauth prototype doesn't use nop-space instructions
+  * Need to figure out how this integrates with Wasmtime's fibers
+    * Apple ABI docs suggest that you can just find the return pointer and frame
+      pointer as long as you don't keep arbitrary code pointers in registers
+* Johnnie Birch
+  * Doing a little benchmarking work
+  * Triaging and cleaning up old issues, could use some help from anyone who has
+    time
+* Benjamin Bouvier
+  * No updates
+* Andrew Brown (via Johnnie/Chris)
+  * Working on the ISLE lowering for `select` on x64