From f3e5183347a4d2e7aae4158b76753bce4387b39a Mon Sep 17 00:00:00 2001
From: yangguo <yangguo@chromium.org>
Date: Tue, 21 Apr 2015 06:44:09 -0700
Subject: [PATCH] Reintroduce %GetRootNaN to fix MIPS.

R=dusan.milosavljevic@imgtec.com

Review URL: https://codereview.chromium.org/1101503003

Cr-Commit-Position: refs/heads/master@{#27967}
---
 src/macros.py                  | 2 +-
 src/runtime.js                 | 1 +
 src/runtime/runtime-numbers.cc | 7 +++++++
 src/runtime/runtime.h          | 3 ++-
 4 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/macros.py b/src/macros.py
index 6038a71ae5..2dab3b2bae 100644
--- a/src/macros.py
+++ b/src/macros.py
@@ -169,7 +169,7 @@ macro SET_PRIVATE(obj, sym, val) = (obj[sym] = val);
 macro DELETE_PRIVATE(obj, sym) = (delete obj[sym]);
 
 # Constants.  The compiler constant folds them.
-const NAN = (0/0);
+const NAN = $NaN;
 const INFINITY = (1/0);
 const UNDEFINED = (void 0);
 
diff --git a/src/runtime.js b/src/runtime.js
index 0e6c68eb36..aaaa4fecba 100644
--- a/src/runtime.js
+++ b/src/runtime.js
@@ -22,6 +22,7 @@ var $String = global.String;
 var $Number = global.Number;
 var $Function = global.Function;
 var $Boolean = global.Boolean;
+var $NaN = %GetRootNaN();
 
 // ECMA-262 Section 11.9.3.
 function EQUALS(y) {
diff --git a/src/runtime/runtime-numbers.cc b/src/runtime/runtime-numbers.cc
index 78dd3cbef6..2bc3af1254 100644
--- a/src/runtime/runtime-numbers.cc
+++ b/src/runtime/runtime-numbers.cc
@@ -579,5 +579,12 @@ RUNTIME_FUNCTION(Runtime_IsNonNegativeSmi) {
   return isolate->heap()->ToBoolean(obj->IsSmi() &&
                                     Smi::cast(obj)->value() >= 0);
 }
+
+
+RUNTIME_FUNCTION(Runtime_GetRootNaN) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 0);
+  return isolate->heap()->nan_value();
+}
 }
 }  // namespace v8::internal
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index 2d475bbec2..602a679e8b 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -380,7 +380,8 @@ namespace internal {
   F(MaxSmi, 0, 1)                      \
   F(NumberToString, 1, 1)              \
   F(IsSmi, 1, 1)                       \
-  F(IsNonNegativeSmi, 1, 1)
+  F(IsNonNegativeSmi, 1, 1)            \
+  F(GetRootNaN, 0, 1)
 
 
 #define FOR_EACH_INTRINSIC_OBJECT(F)                 \