diff --git a/Makefile b/Makefile
index ced7634bb..b5e8992de 100644
--- a/Makefile
+++ b/Makefile
@@ -90,13 +90,13 @@ build/tgo: *.go
 	go build -o build/tgo -i .
 
 # Build IR with the Go compiler.
-build/%.bc: src/examples/% src/examples/%/*.go build/tgo src/runtime/*.go build/runtime-$(TARGET)-combined.bc
-	./build/tgo $(TGOFLAGS) -printir -runtime build/runtime-$(TARGET)-combined.bc -o $@ $(subst src/,,$<)
+build/%.o: src/examples/% src/examples/%/*.go build/tgo src/runtime/*.go build/runtime-$(TARGET)-combined.bc
+	./build/tgo $(TGOFLAGS) -runtime build/runtime-$(TARGET)-combined.bc -o $@ $(subst src/,,$<)
 
 # Compile and optimize bitcode file.
-build/%.o: build/%.bc
-	$(OPT) -coro-early -coro-split -coro-elide -Os -coro-cleanup -o $< $<
-	$(LLC) -filetype=obj -o $@ $<
+#build/%.o: build/%.bc
+#	$(OPT) -coro-early -coro-split -coro-elide -Os -coro-cleanup -o $< $<
+#	$(LLC) -filetype=obj -o $@ $<
 
 # Compile C sources for the runtime.
 build/%.bc: src/runtime/%.c src/runtime/*.h
diff --git a/compiler.go b/compiler.go
index 297fb4549..dbb9b3c96 100644
--- a/compiler.go
+++ b/compiler.go
@@ -1746,8 +1746,12 @@ func (c *Compiler) Optimize(optLevel, sizeLevel int) {
 	builder.PopulateFunc(funcPasses)
 
 	modPasses := llvm.NewPassManager()
+	modPasses.AddCoroEarlyPass()
+	modPasses.AddCoroSplitPass()
+	modPasses.AddCoroElidePass()
 	defer modPasses.Dispose()
 	builder.Populate(modPasses)
+	modPasses.AddCoroCleanupPass()
 
 	modPasses.Run(c.mod)
 }
diff --git a/main.go b/main.go
index 0e0ad3989..8d44f6a30 100644
--- a/main.go
+++ b/main.go
@@ -55,7 +55,7 @@ func Compile(pkgName, runtimePath, outpath, target string, printIR, dumpSSA bool
 	if err := c.Verify(); err != nil {
 		return err
 	}
-	//c.Optimize(2, 1) // -O2 -Os
+	c.Optimize(2, 1) // -O2 -Os
 	if err := c.Verify(); err != nil {
 		return err
 	}