[wasm] Trim graph before scheduling.

test/cctest/compiler/test-run-machops.cc

 // Copyright 2014 the V8 project authors. All rights reserved. Use of this
 // source code is governed by a BSD-style license that can be found in the
 // LICENSE file.
 
 #include <cmath>
 #include <functional>
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/base/ieee754.h"
@@ skipping 4143 matching lines @@
     FOR_UINT64_INPUTS(j) {
       m.Call(static_cast<uint32_t>(*i & 0xffffffff),
              static_cast<uint32_t>(*i >> 32),
              static_cast<uint32_t>(*j & 0xffffffff),
              static_cast<uint32_t>(*j >> 32));
       CHECK_EQ(*i + *j, ToInt64(low, high));
     }
   }
 }
 
+TEST(RunInt32PairAddUseOnlyHighWord) {

[titzer, 2016/10/19 09:20:42]

Can you add tests for all the Int32Pair* operations?

[ahaas, 2016/10/19 09:59:19]

Done.

+  BufferedRawMachineAssemblerTester<int32_t> m(
+      MachineType::Uint32(), MachineType::Uint32(), MachineType::Uint32(),
+      MachineType::Uint32());
+
+  Node* PairAdd = m.Int32PairAdd(m.Parameter(0), m.Parameter(1), m.Parameter(2),
+                                 m.Parameter(3));
+
+  m.Return(m.Projection(1, PairAdd));
+
+  FOR_UINT64_INPUTS(i) {
+    FOR_UINT64_INPUTS(j) {
+      CHECK_EQ(static_cast<uint32_t>((*i + *j) >> 32),
+               m.Call(static_cast<uint32_t>(*i & 0xffffffff),
+                      static_cast<uint32_t>(*i >> 32),
+                      static_cast<uint32_t>(*j & 0xffffffff),
+                      static_cast<uint32_t>(*j >> 32)));
+    }
+  }
+}
+
 void TestInt32PairAddWithSharedInput(int a, int b, int c, int d) {
   BufferedRawMachineAssemblerTester<int32_t> m(MachineType::Uint32(),
                                                MachineType::Uint32());
 
   uint32_t high;
   uint32_t low;
 
   Node* PairAdd = m.Int32PairAdd(m.Parameter(a), m.Parameter(b), m.Parameter(c),
                                  m.Parameter(d));
 
@@ skipping 2397 matching lines @@
   r.Goto(&merge);
   r.Bind(&merge);
   Node* phi = r.Phi(MachineRepresentation::kWord32, fa, fb);
   r.Return(phi);
   CHECK_EQ(1, r.Call(1));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8