Reduce redundant phi nodes after graph building.

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/461003002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23075 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler/pipeline.cc

@@ -14,6 +14,7 @@
 #include "src/compiler/js-context-specialization.h"
 #include "src/compiler/js-generic-lowering.h"
 #include "src/compiler/js-typed-lowering.h"
+#include "src/compiler/phi-reducer.h"
 #include "src/compiler/register-allocator.h"
 #include "src/compiler/schedule.h"
 #include "src/compiler/scheduler.h"
@@ -144,6 +145,17 @@ Handle<Code> Pipeline::GenerateCode() {
     graph_builder.CreateGraph();
     context_node = graph_builder.GetFunctionContext();
   }
+  {
+    PhaseStats phi_reducer_stats(info(), PhaseStats::CREATE_GRAPH,
+                                 "phi reduction");
+    PhiReducer phi_reducer;
+    GraphReducer graph_reducer(&graph);
+    graph_reducer.AddReducer(&phi_reducer);
+    graph_reducer.ReduceGraph();
+    // TODO(mstarzinger): Running reducer once ought to be enough for everyone.
+    graph_reducer.ReduceGraph();
+    graph_reducer.ReduceGraph();
+  }
 
   VerifyAndPrintGraph(&graph, "Initial untyped");
 

test/benchmarks/benchmarks.status

@@ -25,14 +25,11 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-
 [
 [ALWAYS, {
-  # Too slow in Debug mode. TODO(mstarzinger): Too slow for TF.
-  'octane/mandreel': [PASS, NO_VARIANTS, ['mode == debug', SKIP]],
+  # Too slow in Debug mode.
+  'octane/mandreel': [PASS, ['mode == debug', SKIP]],
   # TODO(mstarzinger,ishell): Timeout with TF in predictable mode.
   'octane/richards': [PASS, NO_VARIANTS],
-  # TODO(mstarzinger): Out of mem with TF.
-  'octane/zlib': [PASS, NO_VARIANTS],
 }],  # ALWAYS
 ]