Fix bug in HPhi::SimplifyConstantInput

R=jkummerow@chromium.org
BUG=269679

Review URL: https://codereview.chromium.org/23075003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16174 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen-instructions.cc

@@ -3731,10 +3731,10 @@ void HPhi::SimplifyConstantInputs() {
                          DoubleToInt32(operand->DoubleValue()));
       integer_input->InsertAfter(operand);
       SetOperandAt(i, integer_input);
-    } else if (operand == graph->GetConstantTrue()) {
+    } else if (operand->HasBooleanValue()) {
-      SetOperandAt(i, graph->GetConstant1());
+      SetOperandAt(i, operand->BooleanValue() ? graph->GetConstant1()
-    } else {
+                                              : graph->GetConstant0());
-      // This catches |false|, |undefined|, strings and objects.
+    } else if (operand->ImmortalImmovable()) {
       SetOperandAt(i, graph->GetConstant0());
     }
   }

src/hydrogen-instructions.h

@@ -3362,6 +3362,7 @@ class HConstant: public HTemplateInstruction<0> {
     return external_reference_value_;
   }
 
+  bool HasBooleanValue() const { return type_.IsBoolean(); }
   bool BooleanValue() const { return boolean_value_; }
 
   virtual intptr_t Hashcode() {

test/mjsunit/regress/regress-phi-truncation.js

@@ -0,0 +1,89 @@
+// 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 test(fun, expectation) {
+  assertEquals(1, fun(1));
+  %OptimizeFunctionOnNextCall(fun);
+  assertEquals(expectation, fun(0));
+}
+
+test(function(x) {
+  var a = x ? true : false;
+  return a | 0;
+}, 0);
+
+test(function(x) {
+  var a = x ? true : true;
+  return a | 0;
+}, 1);
+
+test(function(x) {
+  var a = x ? true : "0";
+  return a | 0;
+}, 0);
+
+test(function(x) {
+  var a = x ? true : "1";
+  return a | 0;
+}, 1);
+
+test(function(x) {
+  var a = x ? true : "-1";
+  return a | 0;
+}, -1);
+
+test(function(x) {
+  var a = x ? true : "-0";
+  return a | 0;
+}, 0);
+
+test(function(x) {
+  var a = x ? true : "0x1234";
+  return a | 0;
+}, 0x1234);
+
+test(function(x) {
+  var a = x ? true : { valueOf: function() { return 2; } };
+  return a | 0;
+}, 2);
+
+test(function(x) {
+  var a = x ? true : undefined;
+  return a | 0;
+}, 0);
+
+test(function(x) {
+  var a = x ? true : null;
+  return a | 0;
+}, 0);
+
+test(function(x) {
+  var a = x ? true : "";
+  return a | 0;
+}, 0);