Fix smi-based math floor.

test/mjsunit/regress/regress-smi-math-floor-round.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
 
-function f(i, b) {
-  var a = 0;
-  if (b) {
-    var c = 1 << i;
-    a = c + c;
-  }
-  var x = a >> 3;
-  return a;
+
+function f(o) {
+  return Math.floor(o.x_smi) + 1;
 }
 
-f(1, false);
-f(1, true);
+assertEquals(2, f({x_smi:1}));
+assertEquals(2, f({x_smi:1}));
 %OptimizeFunctionOnNextCall(f);
-assertEquals((1 << 30) * 2, f(30, true));
+assertEquals(2, f({x_smi:1}));
 
-
-var global = 1;
-
-function f2(b) {
-  var a = 0;
-  if (b) {
-    a = global;
-  }
-  var x = a >> 3;
-  return a;
+function f2(o) {
+  return Math.floor(o.x_tagged) + 1;
 }
 
-f2(false);
-f2(true);
+var o = {x_tagged:{}};
+o.x_tagged = 1.4;
+assertEquals(2, f2(o));
+assertEquals(2, f2(o));
 %OptimizeFunctionOnNextCall(f2);
-global = 2.5;
-assertEquals(global, f2(true));
+assertEquals(2, f2(o));
+
+function f3(o) {
+  return Math.round(o.x_smi) + 1;
+}
+
+assertEquals(2, f3({x_smi:1}));
+assertEquals(2, f3({x_smi:1}));
+%OptimizeFunctionOnNextCall(f3);
+assertEquals(2, f3({x_smi:1}));
+
+function f4(o) {
+  return Math.round(o.x_tagged) + 1;
+}
+
+assertEquals(2, f4(o));
+assertEquals(2, f4(o));
+%OptimizeFunctionOnNextCall(f4);
+assertEquals(2, f4(o));