ci/bench.sh: Install QEMU on CI

Author: nhooyr

Diff for: README.md

@@ -118,9 +118,8 @@ Advantages of nhooyr.io/websocket:
   - Gorilla requires registering a pong callback before sending a Ping
 - Can target Wasm ([gorilla/websocket#432](https://github.com/gorilla/websocket/issues/432))
 - Transparent message buffer reuse with [wsjson](https://pkg.go.dev/nhooyr.io/websocket/wsjson) subpackage
-- [3x](https://github.com/nhooyr/websocket/pull/326) faster WebSocket masking implementation in assembly for amd64 and arm64 and [2x](https://github.com/nhooyr/websocket/releases/tag/v1.7.4) faster implementation in pure Go
+- [4x](https://github.com/nhooyr/websocket/pull/326) faster WebSocket masking implementation in assembly for amd64 and arm64 and [2x](https://github.com/nhooyr/websocket/releases/tag/v1.7.4) faster implementation in pure Go
   - Gorilla's implementation is slower and uses [unsafe](https://golang.org/pkg/unsafe/).
-    Soon we'll have assembly and be 3x faster [#326](https://github.com/nhooyr/websocket/pull/326)
 - Full [permessage-deflate](https://tools.ietf.org/html/rfc7692) compression extension support
   - Gorilla only supports no context takeover mode
 - [CloseRead](https://pkg.go.dev/nhooyr.io/websocket#Conn.CloseRead) helper for write only connections ([gorilla/websocket#492](https://github.com/gorilla/websocket/issues/492))

Diff for: ci/bench.sh

@@ -8,5 +8,10 @@ go test --run=^$ --bench=. --benchmem --memprofile ci/out/prof.mem --cpuprofile
   go test --run=^$ --bench=. --benchmem --memprofile ../../ci/out/prof-thirdparty.mem --cpuprofile ../../ci/out/prof-thirdparty.cpu -o ../../ci/out/thirdparty.test "$@" .
 
   GOARCH=arm64 go test -c -o ../../ci/out/thirdparty-arm64.test .
+  if [ "${CI-}" ]; then
+	  sudo apt-get update
+	  sudo apt-get install -y qemu-user-static
+	  alias qemu-aarch64=qemu-aarch64-static
+  fi
   qemu-aarch64 ../../ci/out/thirdparty-arm64.test --test.run=^$ --test.bench=Benchmark_mask --test.benchmem --test.memprofile ../../ci/out/prof-thirdparty-arm64.mem --test.cpuprofile ../../ci/out/prof-thirdparty-arm64.cpu .
 )