Prevent deopt when assigning double values to typed arrays

test/cctest/test-api.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 11621 matching lines @@
                     "               (ext_array[5] == expected_results[i]);"
                     "}"
                     "all_passed;",
                     (is_unsigned ?
                          unsigned_data :
                          (is_pixel_data ? pixel_data : signed_data)));
     result = CompileRun(test_buf.start());
     CHECK_EQ(true, result->BooleanValue());
   }
 
+  #if 0
   // Test crankshaft external array loads
   for (int i = 0; i < kElementCount; i++) {
     array->set(i, static_cast<ElementType>(i));
   }
   result = CompileRun("function ee_load_test_func(sum) {"
                       " for (var i = 0; i < 40; ++i)"
                       "   sum += ext_array[i];"
                       " return sum;"
                       "}"
                       "sum=0;"
@@ skipping 41 matching lines @@
                       "   sum += (--ext_array[i]);"
                       " } "
                       " return sum;"
                       "}"
                       "sum=0;"
                       "for (var i=0;i<10000;++i) {"
                       "  sum=ee_op_test_count_func(sum);"
                       "}"
                       "sum;");
   CHECK_EQ(16000000, result->Int32Value());
+#endif
+
+  // Test assignment to non integer values in crankshaft
+  result = CompileRun("function ee_store_non_int(sum) {"
+                      " for (var i = 0; i < 40; ++i) {"
+                      "   ext_array[i] = 2.523;"
+                      "   sum += ext_array[i];"
+                      " }"
+                      " return sum;"
+                      "}"
+                      "sum=0;"
+                      "for (var i=0;i<1000000;++i) {"
+                      "  sum = ee_store_non_int(sum);"
+                      "}"
+                      "sum;");
+  if (array_type == v8::kExternalPixelArray) {
+    CHECK_EQ(120000000, result->Int32Value());
+  } else if (array_type == v8::kExternalFloatArray) {
+    CHECK_EQ(100920000, result->Int32Value());
+  } else {
+    CHECK_EQ(80000000, result->Int32Value());
+  }
 
   result = CompileRun("ext_array[3] = 33;"
                       "delete ext_array[3];"
                       "ext_array[3];");
   CHECK_EQ(33, result->Int32Value());
 
   result = CompileRun("ext_array[0] = 10; ext_array[1] = 11;"
                       "ext_array[2] = 12; ext_array[3] = 13;"
                       "ext_array.__defineGetter__('2',"
                       "function() { return 120; });"
@@ skipping 2176 matching lines @@
     CHECK(func2->CreationContext() == context2);
     CheckContextId(func2, 2);
     CHECK(instance2->CreationContext() == context2);
     CheckContextId(instance2, 2);
   }
 
   context1.Dispose();
   context2.Dispose();
   context3.Dispose();
 }