Fix float truncations in typed array tests.

test/cctest/compiler/test-run-properties.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 "src/v8.h"
 
 #include "test/cctest/compiler/function-tester.h"
 
 using namespace v8::internal;
 using namespace v8::internal::compiler;
@@ skipping 29 matching lines @@
   EmbeddedVector<char, 1024> source_buffer;
   SNPrintF(source_buffer, source, array_type, arraysize(kValues),
            values_buffer.start(), array_type, arraysize(kValues),
            values_buffer.start(), array_type, array_type);
 
   FunctionTester T(
       source_buffer.start(),
       CompilationInfo::kContextSpecializing | CompilationInfo::kTypingEnabled);
   for (size_t i = 0; i < arraysize(kValues); ++i) {
     for (size_t j = 0; j < arraysize(kValues); ++j) {
-      U value_a = static_cast<U>(kValues[i]);
-      U value_b = static_cast<U>(kValues[j]);
+      volatile U value_a = static_cast<volatile U>(kValues[i]);
+      volatile U value_b = static_cast<volatile U>(kValues[j]);
       double expected =
           static_cast<double>(value_a) + static_cast<double>(value_b);
       T.CheckCall(T.Val(expected), T.Val(static_cast<double>(i)),
                   T.Val(static_cast<double>(j)));
     }
   }
 }
 
 
 TEST(TypedArrayLoad) {
@@ skipping 47 matching lines @@
   EmbeddedVector<char, 2048> source_buffer;
   SNPrintF(source_buffer, source, array_type, arraysize(kValues),
            values_buffer.start(), array_type, arraysize(kValues),
            values_buffer.start(), array_type, array_type);
 
   FunctionTester T(
       source_buffer.start(),
       CompilationInfo::kContextSpecializing | CompilationInfo::kTypingEnabled);
   for (size_t i = 0; i < arraysize(kValues); ++i) {
     for (size_t j = 0; j < arraysize(kValues); ++j) {
-      U value_a = static_cast<U>(kValues[i]);
-      U value_b = static_cast<U>(kValues[j]);
+      volatile U value_a = static_cast<volatile U>(kValues[i]);
+      volatile U value_b = static_cast<volatile U>(kValues[j]);
       double expected =
           static_cast<double>(value_a) + static_cast<double>(value_b);
       T.CheckCall(T.Val(expected), T.Val(static_cast<double>(i)),
                   T.Val(static_cast<double>(j)));
     }
   }
 }
 
 
 TEST(TypedArrayStore) {
   FLAG_typed_array_max_size_in_heap = 256;
   TypedArrayStoreHelper<int8_t>("Int8");
   TypedArrayStoreHelper<uint8_t>("Uint8");
   TypedArrayStoreHelper<int16_t>("Int16");
   TypedArrayStoreHelper<uint16_t>("Uint16");
   TypedArrayStoreHelper<int32_t>("Int32");
   TypedArrayStoreHelper<uint32_t>("Uint32");
   TypedArrayStoreHelper<float>("Float32");
   TypedArrayStoreHelper<double>("Float64");
   // TODO(mstarzinger): Add tests for ClampedUint8.
 }