Improve dead code elimination by transitively marking live code and removing all dead code. Replace…

test/mjsunit/compiler/dead-code.js

Index: test/mjsunit/compiler/dead-code.js
diff --git a/test/mjsunit/keyed-storage-extend.js b/test/mjsunit/compiler/dead-code.js
similarity index 62%
copy from test/mjsunit/keyed-storage-extend.js
copy to test/mjsunit/compiler/dead-code.js
index d7e157b84654063ba39a4f6795bf045ae0c92284..8b5bd2cf90e9b12a42995d5369181186f85cbac0 100644
--- a/test/mjsunit/keyed-storage-extend.js
+++ b/test/mjsunit/compiler/dead-code.js
@@ -25,31 +25,55 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-function F() { }
-
-function GrowNamed(o) {
-  o.a = 1;
-  o.b = 2;
-  o.c = 3;
-  o.d = 4;
-  o.e = 5;
-  o.f = 6;
+function dead1(a, b) {
+    var x = a + b;
+    return a; // x is dead
 }
 
-function GrowKeyed(o) {
-  var names = ['a','b','c','d','e','f'];
-  var i = 0;
-  o[names[i++]] = i;
-  o[names[i++]] = i;
-  o[names[i++]] = i;
-  o[names[i++]] = i;
-  o[names[i++]] = i;
-  o[names[i++]] = i;
+function dead2(a, b) {
+    var x = a | 0;
+    var y = b | 0;
+    return a; // x and y are both dead
 }
 
-GrowNamed(new F());
-GrowNamed(new F());
-GrowNamed(new F());
-GrowKeyed(new F());
-GrowKeyed(new F());
-GrowKeyed(new F());
+function dead3(a, b) {
+    var z;
+    if(a == 2) z = a;
+    else z = b;
+    return a; // z is dead
+}
+
+function dead4(a) {
+    var z = 3;
+    for (i = 0; i < 3; i++) {
+        z++;
+    }
+    return a; // z is dead
+}
+
+function dead5(a) {
+    var z = 3;
+    for (i = 0; i < 3; i++) {
+        z++;
+    }
+    var w = z + a;
+    return a; // z is dead
+}
+
+assertTrue(dead1(33, 32) == 33);
+assertTrue(dead2(33, 32) == 33);
+assertTrue(dead3(33, 32) == 33);
+assertTrue(dead4(33) == 33);
+assertTrue(dead5(33) == 33);
+
+assertTrue(dead1(34, 7) == 34);
+assertTrue(dead2(34, 7) == 34);
+assertTrue(dead3(34, 7) == 34);
+assertTrue(dead4(34) == 34);
+assertTrue(dead5(34) == 34);
+
+assertTrue(dead1(3.4, 0.1) == 3.4);
+assertTrue(dead2(3.4, 0.1) == 3.4);
+assertTrue(dead3(3.4, 0.1) == 3.4);
+assertTrue(dead4(3.4) == 3.4);
+assertTrue(dead5(3.4) == 3.4);