Elements kind conversion in generated code (ia32).

test/mjsunit/elements-transition.js

+// 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --allow-natives-syntax --smi-only-arrays
+
+support_smi_only_arrays = %HasFastSmiOnlyElements([]);
+
+if (support_smi_only_arrays) {
+  function test(test_double, test_object, set, length) {
+    // We apply the same operations to two identical arrays.  The first array
+    // triggers an IC miss, upon which the conversion stub is generated, but the
+    // actual conversion is done in runtime.  The second array, arriving at
+    // the previously patched IC, is then converted using the conversion stub.
+    var array_1 = new Array(length);
+    var array_2 = new Array(length);
+
+    assertTrue(%HasFastSmiOnlyElements(array_1));
+    assertTrue(%HasFastSmiOnlyElements(array_2));
+    for (var i = 0; i < length; i++) {
+      if (i == length - 8 && test_double) {
+        set(array_1, i, 0.5);
+        set(array_2, i, 0.5);
+        assertTrue(%HasFastDoubleElements(array_1));
+        assertTrue(%HasFastDoubleElements(array_2));
+      } else if (i == length - 5 && test_object) {
+        set(array_1, i, 'object');
+        set(array_2, i, 'object');
+        assertTrue(%HasFastElements(array_1));
+        assertTrue(%HasFastElements(array_2));
+      } else {
+        set(array_1, i, 2*i+1);
+        set(array_2, i, 2*i+1);
+      }
+    }
+
+    for (var i = 0; i < length; i++) {
+      if (i == length - 8 && test_double) {
+        assertEquals(0.5, array_1[i]);
+        assertEquals(0.5, array_2[i]);
+      } else if (i == length - 5 && test_object) {
+        assertEquals('object', array_1[i]);
+        assertEquals('object', array_2[i]);
+      } else {
+        assertEquals(2*i+1, array_1[i]);
+        assertEquals(2*i+1, array_2[i]);
+      }
+    }
+  }
+
+  test(false, false, function(a,i,v){ a[i] = v; }, 100);
+  test(true,  false, function(a,i,v){ a[i] = v; }, 100);
+  test(false, true,  function(a,i,v){ a[i] = v; }, 100);
+  test(true,  true,  function(a,i,v){ a[i] = v; }, 100);
+
+  test(false, false, function(a,i,v){ a[i] = v; }, 10000);
+  test(true,  false, function(a,i,v){ a[i] = v; }, 10000);
+  test(false, true,  function(a,i,v){ a[i] = v; }, 10000);
+  test(true,  true,  function(a,i,v){ a[i] = v; }, 10000);
+}