From e71a91ca08067ca65523c9af67c206d3234c8b7c Mon Sep 17 00:00:00 2001
From: "jkummerow@chromium.org"
 <jkummerow@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Wed, 14 Aug 2013 12:14:08 +0000
Subject: [PATCH] Fix Math.round/floor that had bogus Smi representation

BUG=chromium:272564
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/23022005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16185 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/hydrogen-instructions.cc                 |  2 --
 src/hydrogen-instructions.h                  | 22 +------------
 test/mjsunit/regress/regress-crbug-272564.js | 49 ++++++++++++++++++++++++++++
 3 files changed, 50 insertions(+), 23 deletions(-)
 create mode 100644 test/mjsunit/regress/regress-crbug-272564.js

diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 1f51b24..a4c54e7 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -3175,8 +3175,6 @@ Representation HUnaryMathOperation::RepresentationFromInputs() {
   Representation input_rep = value()->representation();
   if (!input_rep.IsTagged()) {
     rep = rep.generalize(input_rep);
-  } else if (flexible_int()) {
-    rep = Representation::Integer32();
   }
   return rep;
 }
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 307ed80..7eae85b 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -2433,21 +2433,6 @@ class HUnaryMathOperation: public HTemplateInstruction<2> {
     }
   }
 
-  virtual void UpdateRepresentation(Representation new_rep,
-                                    HInferRepresentationPhase* h_infer,
-                                    const char* reason) {
-    if (flexible_int() && !new_rep.IsSmi()) {
-      new_rep = Representation::Integer32();
-    }
-    HValue::UpdateRepresentation(new_rep, h_infer, reason);
-  }
-
-  virtual void RepresentationChanged(Representation new_rep) {
-    if (flexible_int() && new_rep.IsInteger32()) {
-      ClearFlag(kFlexibleRepresentation);
-    }
-  }
-
   virtual Range* InferRange(Zone* zone);
 
   virtual HValue* Canonicalize();
@@ -2465,10 +2450,6 @@ class HUnaryMathOperation: public HTemplateInstruction<2> {
   }
 
  private:
-  bool flexible_int() {
-    return op_ == kMathFloor || op_ == kMathRound;
-  }
-
   HUnaryMathOperation(HValue* context, HValue* value, BuiltinFunctionId op)
       : HTemplateInstruction<2>(HType::TaggedNumber()), op_(op) {
     SetOperandAt(0, context);
@@ -2476,8 +2457,7 @@ class HUnaryMathOperation: public HTemplateInstruction<2> {
     switch (op) {
       case kMathFloor:
       case kMathRound:
-        set_representation(Representation::Smi());
-        SetFlag(kFlexibleRepresentation);
+        set_representation(Representation::Integer32());
         break;
       case kMathAbs:
         // Not setting representation here: it is None intentionally.
diff --git a/test/mjsunit/regress/regress-crbug-272564.js b/test/mjsunit/regress/regress-crbug-272564.js
new file mode 100644
index 0000000..5475298
--- /dev/null
+++ b/test/mjsunit/regress/regress-crbug-272564.js
@@ -0,0 +1,49 @@
+// 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 Bb(w) {
+  this.width = w;
+}
+
+function ce(a, b) {
+  "number" == typeof a && (a = (b ? Math.round(a) : a) + "px");
+  return a
+}
+
+function pe(a, b, c) {
+  if (b instanceof Bb) b = b.width;
+  a.width = ce(b, !0);
+}
+
+var a = new Bb(1);
+var b = new Bb(5);
+pe(a, b, 0);
+pe(a, b, 0);
+%OptimizeFunctionOnNextCall(pe);
+pe(a, b, 0);
-- 
2.7.4