A64: Synchronize with r16024.

test/mjsunit/compiler/dead-string-add.js

 // Copyright 2013 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
-
-var g1 = { a:1 }
-
-function load() {
-  return g1.a;
+function dead1(a, b) {
+    var x = "a" + "b";
+    return a; // x, "a", and "b" are dead code
 }
 
-assertEquals(1, load());
-assertEquals(1, load());
-%OptimizeFunctionOnNextCall(load);
-assertEquals(1, load());
-delete g1.a;
-assertEquals(undefined, load());
-
-var g2 = { a:2 }
-
-function load2() {
-  return g2.a;
+function dead2(a, b) {
+    var x = a + "0";
+    var y = b + "0";
+    return a; // x and y are both dead
 }
 
-assertEquals(2, load2());
-assertEquals(2, load2());
-%OptimizeFunctionOnNextCall(load2);
-assertEquals(2, load2());
-g2.b = 10;
-g2.a = 5;
-assertEquals(5, load2());
-
-var g3 = { a:2, b:9, c:1 }
-
-function store(v) {
-  g3.a = v;
-  return g3.a;
+function dead3(a, b) {
+    a = a ? "1" : "0";
+    b = b ? "1" : "0";
+    var x = a + "0";
+    var y = b + "0";
+    return a; // x and y are both dead
 }
 
-assertEquals(5, store(5));
-assertEquals(8, store(8));
-%OptimizeFunctionOnNextCall(store);
-assertEquals(10, store(10));
-delete g3.c;
-store(7);
-assertEquals({a:7, b:9}, g3);
+assertEquals(33, dead1(33, 32));
+assertEquals(33, dead2(33, 32));
+assertEquals("1", dead3(33, 32));
+
+assertEquals(31, dead1(31, 30));
+assertEquals(31, dead2(31, 30));
+assertEquals("1", dead3(31, 32));
+
+assertEquals(0, dead1(0, 30));
+assertEquals(0, dead2(0, 30));
+assertEquals("0", dead3(0, 32));
+
+assertEquals(true, dead1(true, 0));
+assertEquals(true, dead2(true, 0));
+assertEquals("1", dead3(true, 0));
+
+assertEquals("true", dead1("true", 0));
+assertEquals("true", dead2("true", 0));
+assertEquals("1", dead3("true", 0));