tried the wasmer plan

.gitmodules

@@ -7,3 +7,6 @@
 [submodule "binaryen"]
 	path = binaryen
 	url = git://github.com/WebAssembly/binaryen.git
+[submodule "wasmer"]
+	path = wasmer
+	url = https://github.com/wasmerio/wasmer

utils/pipeline/README.md

@@ -63,6 +63,13 @@ cmake ..
 cmake --build .
 ```
 
+__wasmer__
+
+```
+cd wasmer
+make release-llvm
+```
+
 __binaryen__
 
 ```
@@ -77,6 +84,8 @@ Python3 >= 3.6
 
 LLVM >= 8.0
 
+Rust (Nightly)
+
 ### Note
 1. current solution for __`.opt`__ → __`.ll`__ is not so reliable
 2. for reference, my env is `llv=9.0.0`, `gcc=9.2.0`, `cmake=3.15.3`

utils/pipeline/pipeline.sh

@@ -5,6 +5,15 @@ ext=$(echo $1 | sed 's/^.*\.//')
 
 # export BINARYEN_DEBUG_SOUPERIFY=0
 
+:<<EOF
+if [ "${ext}" == "wast" ]; then
+  echo "### step0 wast2ll \c"
+  ../../wasmer/target/release/wasmer run ${name}.wast --backend=llvm --disable-cache --llvm-pre-opt-ir=${name}.ll
+  ext='ll'
+  echo "okay"
+fi
+EOF
+
 if [ "${ext}" == "wast" ]; then
   echo "### step1 wast2wasm \c"
   ../../wabt/bin/wat2wasm ${name}.wast -o ${name}.wasm