Add Smallpt benchmark

test/benchmark/smallpt/README.md

@@ -0,0 +1,44 @@
+# smallpt
+
+### Results
+
+```log
+TODO
+```
+
+### Building
+
+```sh
+wasic++ -O3 -Wl,-z,stack-size=$[256*1024] smallpt-ex.cpp -o smallpt-ex.wasm
+```
+
+### Running
+
+```sh
+export ENGINES_PATH=/opt/wasm_engines
+
+# Wasm3
+../../../build/wasm3 smallpt-ex.wasm > image.ppm
+
+# WAC
+$ENGINES_PATH/wac/wax smallpt-ex.wasm > image.ppm
+
+# wasm-micro-runtime
+$ENGINES_PATH/wasm-micro-runtime/core/iwasm/products/linux/build/iwasm smallpt-ex.wasm > image.ppm
+
+# wasmtime
+wasmtime --optimize smallpt-ex.wasm > image.ppm
+
+# Wasmer
+wasmer run smallpt-ex.wasm > image.ppm
+wasmer run --backend singlepass smallpt-ex.wasm > image.ppm
+wasmer run --backend llvm       smallpt-ex.wasm > image.ppm
+
+# Wasmer-JS (V8)
+wasmer-js run smallpt-ex.wasm > image.ppm
+
+node --wasm_interpret_all $(which wasmer-js) run smallpt-ex.wasm > image.ppm
+
+# WAVM
+$ENGINES_PATH/WAVM/Release/bin/wavm run smallpt-ex.wasm > image.ppm
+```