diff --git a/.gitmodules b/.gitmodules
index 088cc34f..1265cfaa 100644
--- a/.gitmodules
+++ b/.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
diff --git a/utils/pipeline/README.md b/utils/pipeline/README.md
index ae73776e..a3ccc8fe 100644
--- a/utils/pipeline/README.md
+++ b/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`
diff --git a/utils/pipeline/bc2opt2ll.py b/utils/pipeline/bc2opt2ll.py
index 2b41681e..e11beb72 100644
--- a/utils/pipeline/bc2opt2ll.py
+++ b/utils/pipeline/bc2opt2ll.py
@@ -29,7 +29,9 @@ def batch_opt2ll(file_names):
     for file_name in file_names:
         try:
             result = subprocess.run(
-                f'python3 souper2llvm.py {file_name}.opt > {file_name}.ll',
+                # the former uses compiled script, the latter uses raw script
+                # ../../souper/build/souper2llvm ${name}.opt > ${name}.ll
+                f'python souper2llvm.py {file_name}.opt > {file_name}.ll',
                 check=True,
                 shell=True,
                 stdout=subprocess.PIPE,
diff --git a/utils/pipeline/pipeline.sh b/utils/pipeline/pipeline.sh
index 72f963e8..54880b55 100644
--- a/utils/pipeline/pipeline.sh
+++ b/utils/pipeline/pipeline.sh
@@ -5,39 +5,56 @@ ext=$(echo $1 | sed 's/^.*\.//')
 
 # export BINARYEN_DEBUG_SOUPERIFY=0
 
+:<<EOF
 if [ "${ext}" == "wast" ]; then
-  echo "### step1 wast2wasm \c"
-  ../../wabt/bin/wat2wasm ${name}.wast -o ${name}.wasm
+  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
 
-  echo "### step2 wasm2opt \c"
-  ../../binaryen/bin/wasm-opt ${name}.wasm --flatten --souperify-single-use > ${name}.opt
+if [ "${ext}" == "wast" ]; then
+  echo "### step1 wast2wasm \c"
+  ../../wabt/bin/wat2wasm ${name}.wast -o ${name}.wasm
+  # ../../binaryen/bin/wasm-as ${name}.wast > ${name}.wasm
+  ext='wasm'
   echo "okay"
 fi
 
 if [ "${ext}" == "wasm" ]; then
   echo "### step2 wasm2opt \c"
-  ../../binaryen/bin/wasm-opt ${name}.wasm --flatten --souperify-single-use > ${name}.opt
+  ../../binaryen/bin/wasm-opt ${name}.wasm --flatten --simplify-locals-nonesting --reorder-locals --souperify > ${name}.opt
+  ext='opt'
   echo "okay"
 fi
 
-echo "### step3 opt2ll \c"
-python souper2llvm.py ${name}.opt > ${name}.ll
-# ../../souper/build/souper2llvm ${name}.opt > ${name}.ll # it seems not so good
-echo "okay"
+if [ "${ext}" == "opt" ]; then
+  echo "### step3 opt2ll \c"
+  python souper2llvm.py ${name}.opt > ${name}.ll
+  # ../../souper/build/souper2llvm ${name}.opt > ${name}.ll
+  ext='ll'
+  echo "okay"
+fi
 
-echo "### step4 ll2bc \c"
-llvm-as ${name}.ll
-echo "okay"
+if [ "${ext}" == "ll" ]; then
+  echo "### step4 ll2bc \c"
+  llvm-as ${name}.ll
+  ext='bc'
+  echo "okay"
+fi
 
-echo "### step5 bc2opt2ll \c"
-sh bc2opt2ll.sh ${name}.bc ../../souper/build/souper
-echo "okay"
+if [ "${ext}" == "bc" ]; then
+  echo "### step5 bc2opt2ll \c"
+  sh bc2opt2ll.sh ${name}.bc ../../souper/build/souper
+  ext='ll'
+  echo "okay"
+fi
 
-echo "### extra ll2s \c"
-llc -march=wasm32 -filetype=asm ${name}.ll
-echo "okay"
+# echo "### extra ll2s \c"
+# llc -march=wasm32 -filetype=asm ${name}.ll
+# echo "okay"
 
-echo "### extra ll2o \c"
-llc -march=wasm32 -filetype=obj ${name}.ll
-echo "okay"
+# echo "### extra ll2o \c"
+# llc -march=wasm32 -filetype=obj ${name}.ll
+# echo "okay"
diff --git a/wasmer b/wasmer
new file mode 160000
index 00000000..88f126a0
--- /dev/null
+++ b/wasmer
@@ -0,0 +1 @@
+Subproject commit 88f126a00b9eb867b36213c2530e3e6619f29dfe