diff --git a/deps/v8/src/hydrogen-instructions.cc b/deps/v8/src/hydrogen-instructions.cc
index 206ab7e2accf5e..ee3468e8aa6753 100644
--- a/deps/v8/src/hydrogen-instructions.cc
+++ b/deps/v8/src/hydrogen-instructions.cc
@@ -1371,7 +1371,6 @@ HValue* HUnaryMathOperation::Canonicalize() {
 
   if (op() == kMathFloor) {
     HValue* val = value();
-    if (val->IsChange()) val = HChange::cast(val)->value();
     if (val->IsDiv() && (val->UseCount() == 1)) {
       HDiv* hdiv = HDiv::cast(val);
       HValue* left = hdiv->left();
@@ -1410,17 +1409,8 @@ HValue* HUnaryMathOperation::Canonicalize() {
       }
       HMathFloorOfDiv* instr =
           HMathFloorOfDiv::New(block()->zone(), context(), new_left, new_right);
-      // Replace this HMathFloor instruction by the new HMathFloorOfDiv.
       instr->InsertBefore(this);
-      ReplaceAllUsesWith(instr);
-      Kill();
-      // We know the division had no other uses than this HMathFloor. Delete it.
-      // Dead code elimination will deal with |left| and |right| if
-      // appropriate.
-      hdiv->DeleteAndReplaceWith(NULL);
-
-      // Return NULL to remove this instruction from the graph.
-      return NULL;
+      return instr;
     }
   }
   return this;
@@ -2463,6 +2453,7 @@ HConstant::HConstant(Handle<Object> handle, Representation r)
     has_smi_value_ = has_int32_value_ && Smi::IsValid(int32_value_);
     double_value_ = n;
     has_double_value_ = true;
+    // TODO(titzer): if this heap number is new space, tenure a new one.
   } else {
     is_internalized_string_ = handle->IsInternalizedString();
   }
@@ -2661,6 +2652,9 @@ void HConstant::PrintDataTo(StringStream* stream) {
   } else {
     handle(Isolate::Current())->ShortPrint(stream);
   }
+  if (!is_not_in_new_space_) {
+    stream->Add("[new space] ");
+  }
 }
 
 
diff --git a/deps/v8/src/hydrogen-instructions.h b/deps/v8/src/hydrogen-instructions.h
index 1703ddedd5331d..da5cdeced4c6a9 100644
--- a/deps/v8/src/hydrogen-instructions.h
+++ b/deps/v8/src/hydrogen-instructions.h
@@ -1472,6 +1472,8 @@ class HReturn V8_FINAL : public HTemplateControlInstruction<0, 3> {
   DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P1(HReturn, HValue*);
 
   virtual Representation RequiredInputRepresentation(int index) V8_OVERRIDE {
+    // TODO(titzer): require an Int32 input for faster returns.
+    if (index == 2) return Representation::Smi();
     return Representation::Tagged();
   }
 
diff --git a/deps/v8/src/version.cc b/deps/v8/src/version.cc
index dfda1a3ba6d7ad..fa89770466e67e 100644
--- a/deps/v8/src/version.cc
+++ b/deps/v8/src/version.cc
@@ -35,7 +35,7 @@
 #define MAJOR_VERSION     3
 #define MINOR_VERSION     22
 #define BUILD_NUMBER      24
-#define PATCH_LEVEL       17
+#define PATCH_LEVEL       19
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)
 #define IS_CANDIDATE_VERSION 0
diff --git a/deps/v8/test/mjsunit/regress-333594.js b/deps/v8/test/mjsunit/regress-333594.js
new file mode 100644
index 00000000000000..6f6dbaafcd64d8
--- /dev/null
+++ b/deps/v8/test/mjsunit/regress-333594.js
@@ -0,0 +1,42 @@
+// Copyright 2014 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
+
+var a = { x: 1.1 };
+a.x = 0;
+var G = a.x;
+var o = { x: {} };
+
+function func() {
+  return {x: G};
+}
+
+func();
+func();
+%OptimizeFunctionOnNextCall(func);
+assertEquals(0, func().x);
diff --git a/deps/v8/test/mjsunit/regress/regress-334708.js b/deps/v8/test/mjsunit/regress/regress-334708.js
new file mode 100644
index 00000000000000..f0291bbdab6112
--- /dev/null
+++ b/deps/v8/test/mjsunit/regress/regress-334708.js
@@ -0,0 +1,42 @@
+// Copyright 2014 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 foo(x, y) {
+  return Math.floor(x / y);
+}
+
+function bar(x, y) {
+  return foo(x + 1, y + 1);
+}
+
+foo(16, "4");
+
+bar(64, 2);
+%OptimizeFunctionOnNextCall(bar);
+bar(64, 2);