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

test/mjsunit/compiler/dead-code6.js

Index: test/mjsunit/compiler/dead-code6.js
diff --git a/test/mjsunit/regress/regress-1563.js b/test/mjsunit/compiler/dead-code6.js
similarity index 65%
copy from test/mjsunit/regress/regress-1563.js
copy to test/mjsunit/compiler/dead-code6.js
index 884b12595a6d7bc41c4bcad94c014b9379241811..ec9b8433ddd72187b3f9dab70baf2399fac0cdb2 100644
--- a/test/mjsunit/regress/regress-1563.js
+++ b/test/mjsunit/compiler/dead-code6.js
@@ -26,19 +26,48 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
+// Test some dead code elimination scenarios
 
-obj = new Uint8ClampedArray(10);
+function dead1(x, y) {
+    var a = x | 0, b = y | 0;
+    a * b;
+    a << b;
+    a >> b;
+    a >>> b;
+    a | b;
+    a & b;
+    a ^ b;
+    return x;
+}
+
+function dead2(x, y) {
+    var a = x | 0, b = y | 0;
+    (a | 0) * b;
+    (a | 0) << b;
+    (a | 0) >> b;
+    (a | 0) >>> b;
+    (a | 0) | b;
+    (a | 0) & b;
+    (a | 0) ^ b;
+    return x;
+}
 
-// Test that undefined gets properly clamped in Crankshafted pixel array
-// assignments.
-function set_pixel(obj, arg) {
-  obj[0] = arg;
+function dead3(a, b) {
+    a == 2 ? (a * b) : (b * a); // dead
+    return a;
 }
 
-set_pixel(obj, 1.5);
-set_pixel(obj, NaN);
-%OptimizeFunctionOnNextCall(set_pixel);
-set_pixel(obj, undefined);
-set_pixel(obj, undefined);
+assertTrue(dead1(33, 32) == 33);
+assertTrue(dead1(33, 32) == 33);
+%OptimizeFunctionOnNextCall(dead1);
+assertTrue(dead1(33, 32) == 33);
+
+assertTrue(dead2(34, 11) == 34);
+assertTrue(dead2(34, 11) == 34);
+%OptimizeFunctionOnNextCall(dead2);
+assertTrue(dead2(34, 11) == 34);
 
-assertEquals(0, obj[0]);
+assertTrue(dead3(35, 12) == 35);
+assertTrue(dead3(35, 12) == 35);
+%OptimizeFunctionOnNextCall(dead3);
+assertTrue(dead3(35, 12) == 35);