Prevent deopt when assigning double values to typed arrays

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index d7621d12cf2ff1af6c02c36abd4c626b418eb612..a16a8ad42dd66bba96efbd40f1c8e6d5746b589e 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -11639,6 +11639,7 @@ static void ExternalArrayTestHelper(v8::ExternalArrayType array_type,
     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));
@@ -11700,6 +11701,28 @@ static void ExternalArrayTestHelper(v8::ExternalArrayType array_type,
                       "}"
                       "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];"