Add benchmarks and CI using AirspeedVelocity

.github/workflows/benchmark_pr.yml

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+name: Benchmark a pull request
+
+on:
+  pull_request_target:
+    branches:
+      - master
+
+permissions:
+  pull-requests: write
+
+jobs:
+    generate_plots:
+        runs-on: ubuntu-latest
+
+        steps:
+            - uses: actions/checkout@v2
+            - uses: julia-actions/setup-julia@v1
+              with:
+                version: "1.8"
+            - uses: julia-actions/cache@v1
+            - name: Extract Package Name from Project.toml
+              id: extract-package-name
+              run: |
+                PACKAGE_NAME=$(grep "^name" Project.toml | sed 's/^name = "\(.*\)"$/\1/')
+                echo "::set-output name=package_name::$PACKAGE_NAME"
+            - name: Build AirspeedVelocity
+              env:
+                JULIA_NUM_THREADS: 2
+              run: |
+                # Lightweight build step, as sometimes the runner runs out of memory:
+                julia -e 'ENV["JULIA_PKG_PRECOMPILE_AUTO"]=0; import Pkg; Pkg.add(;url="https://github.com/MilesCranmer/AirspeedVelocity.jl.git")'
+                julia -e 'ENV["JULIA_PKG_PRECOMPILE_AUTO"]=0; import Pkg; Pkg.build("AirspeedVelocity")'
+            - name: Add ~/.julia/bin to PATH
+              run: |
+                echo "$HOME/.julia/bin" >> $GITHUB_PATH
+            - name: Run benchmarks
+              run: |
+                echo $PATH
+                ls -l ~/.julia/bin
+                mkdir results
+                benchpkg ${{ steps.extract-package-name.outputs.package_name }} --rev="${{github.event.repository.default_branch}},${{github.event.pull_request.head.sha}}" --url=${{ github.event.repository.clone_url }} --bench-on="${{github.event.repository.default_branch}}" --output-dir=results/
+            - name: Create plots from benchmarks
+              run: |
+                mkdir -p plots
+                benchpkgplot ${{ steps.extract-package-name.outputs.package_name }} --rev="${{github.event.repository.default_branch}},${{github.event.pull_request.head.sha}}" --npart=10 --format=png --input-dir=results/ --output-dir=plots/
+            - name: Upload plot as artifact
+              uses: actions/upload-artifact@v2
+              with:
+                name: plots
+                path: plots
+            - name: Create markdown table from benchmarks
+              run: |
+                julia -e 'using AirspeedVelocity; combined_results=load_results("${{ steps.extract-package-name.outputs.package_name }}", ["${{github.event.repository.default_branch}}", "${{github.event.pull_request.head.sha}}"], input_dir="results"); table = create_table(combined_results); open("table.md", "w") do io; print(io, table); end'
+                echo '### Benchmark Results' > body.md
+                echo '' >> body.md
+                echo '' >> body.md
+                cat table.md >> body.md
+                echo '' >> body.md
+                echo '' >> body.md
+                echo '### Benchmark Plots' >> body.md
+                echo 'A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.' >> body.md
+                echo 'Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).' >> body.md
+
+            - name: Comment on PR
+              uses: peter-evans/create-or-update-comment@v3
+              with:
+                issue-number: ${{ github.event.pull_request.number }}
+                body-path: body.md

benchmark/benchmarks.jl

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+using BenchmarkTools
+
+const SUITE = BenchmarkGroup()
+
+function perf_steprange_long(x, a)
+    s = zero(eltype(x))
+
+    @inbounds for j in a
+        for i in LoopVecRange{8}(1, j)
+            s += x[i]
+        end
+    end
+
+    return s
+end
+
+function perf_steprange(x)
+    s = zero(eltype(x))
+
+    @inbounds for i in LoopVecRange{8}(x)
+        s += x[i]
+    end
+
+    return s
+end
+
+SUITE["LoopVecRange"] = BenchmarkGroup(["string", "unicode"])
+
+SUITE["LoopVecRange"]["steprange"] = @benchmarkable perf_steprange($x) setup=(x=rand(800))
+
+tmp_x=rand(800)
+SUITE["LoopVecRange"]["steprange_long"] = @benchmarkable perf_steprange_long($tmp_x, $(rand(round(Int, length(tmp_x) / 2):length(tmp_x), 10^6)))