Fix bugs in the range analysis for integers....

test/mjsunit/compiler/regress-intoverflow.js

+// Copyright 2010 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.
+
+// Test overflow checks in optimized code.
+function testMul(a, b) {
+  a *= 2;
+  b *= 2;
+  if (a < 1 && b < 1) {
+    return a * b;
+  }
+}
+
+for (var i=0; i<10000000; i++) testMul(0,0);
+assertEquals(4611686018427388000, testMul(-0x40000000, -0x40000000));
+
+function testAdd(a, b) {
+  a *= 2;
+  b *= 2;
+  if (a < 1 && b < 1) {
+    return a + b;
+  }
+}
+
+for (var i=0; i<10000000; i++) testAdd(0,0);
+assertEquals(-4294967296, testAdd(-0x40000000, -0x40000000));
+
+
+function testSub(a, b) {
+  a *= 2;
+  b *= 2;
+  if (b == 2) {print(a); print(b);}
+  if (a < 1 && b < 3) {
+    return a - b;
+  }
+}
+
+for (var i=0; i<10000000; i++) testSub(0,0);
+assertEquals(-2147483650, testSub(-0x40000000, 1));