[wasm] Initial commit for the Int64Reducer.

test/cctest/wasm/wasm-run-utils.h

Index: test/cctest/wasm/wasm-run-utils.h
diff --git a/test/cctest/wasm/wasm-run-utils.h b/test/cctest/wasm/wasm-run-utils.h
index f855306763f36142b7e876bbb0ed461dc0ca5a38..9eca72b8d197f02e2f759810dd0d984e5a477d6f 100644
--- a/test/cctest/wasm/wasm-run-utils.h
+++ b/test/cctest/wasm/wasm-run-utils.h
@@ -12,6 +12,7 @@
 #include "src/base/utils/random-number-generator.h"
 
 #include "src/compiler/graph-visualizer.h"
+#include "src/compiler/int64-reducer.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/wasm-compiler.h"
 
@@ -283,6 +284,13 @@ class WasmFunctionCompiler : public HandleAndZoneScope,
   Handle<Code> Compile(ModuleEnv* module) {
     descriptor_ = module->GetWasmCallDescriptor(this->zone(), env.sig);
     CompilationInfo info("wasm compile", this->isolate(), this->zone());
+
+#if !WASM_64
+    Int64Reducer r(this->graph(), this->machine(), this->common(),

[titzer, 2016/02/02 10:14:35]

I think you should move this use of the pipeline into a method in
wasm-compiler.cc and only do it if there is a node in the graph that requires
it. E.g. a WasmCompiler::CompileForTesting() method.

[ahaas, 2016/02/02 13:32:48]

I call WasmCompiler::Int64LoweringForTesting now after BuildTFGraph.

+                   this->zone());
+    r.ReduceGraph();
+#endif
+
     Handle<Code> result =
         Pipeline::GenerateCodeForTesting(&info, descriptor_, this->graph());
 #ifdef ENABLE_DISASSEMBLER