From 917ac7d4131795bfd84694a07364e6bba2d8693a Mon Sep 17 00:00:00 2001
From: "verwaest@chromium.org"
 <verwaest@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Thu, 20 Jun 2013 14:11:52 +0000
Subject: [PATCH] Improve range analysis for smi phi

R=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/17498002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15247 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/hydrogen-instructions.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index f746af54bd..e227cea08b 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -1761,9 +1761,12 @@ Range* HConstant::InferRange(Zone* zone) {
 
 
 Range* HPhi::InferRange(Zone* zone) {
-  if (representation().IsInteger32()) {
+  Representation r = representation();
+  if (r.IsSmiOrInteger32()) {
     if (block()->IsLoopHeader()) {
-      Range* range = new(zone) Range(kMinInt, kMaxInt);
+      Range* range = r.IsSmi()
+          ? new(zone) Range(Smi::kMinValue, Smi::kMaxValue)
+          : new(zone) Range(kMinInt, kMaxInt);
       return range;
     } else {
       Range* range = OperandAt(0)->range()->Copy(zone);