From: mmassi@chromium.org <mmassi@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Wed, 26 Sep 2012 09:35:41 +0000 (+0000)
Subject: Lowered kMaxVirtualRegisters (fixes v8 2139 and chrome 123822 and 128252).
X-Git-Tag: upstream/4.7.83~15935
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e7fc0207ab4dc5a32183eb5c2f9ccb360ab38d7f;p=platform%2Fupstream%2Fv8.git

Lowered kMaxVirtualRegisters (fixes v8 2139 and chrome 123822 and 128252).

BUG=128252

Review URL: https://chromiumcodereview.appspot.com/10966031

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12613 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---

diff --git a/src/lithium.h b/src/lithium.h
index e1cd52a..b4eb2bb 100644
--- a/src/lithium.h
+++ b/src/lithium.h
@@ -133,13 +133,15 @@ class LUnallocated: public LOperand {
   // index in the upper bits.
   static const int kPolicyWidth = 3;
   static const int kLifetimeWidth = 1;
-  static const int kVirtualRegisterWidth = 18;
+  static const int kVirtualRegisterWidth = 15;
 
   static const int kPolicyShift = kKindFieldWidth;
   static const int kLifetimeShift = kPolicyShift + kPolicyWidth;
   static const int kVirtualRegisterShift = kLifetimeShift + kLifetimeWidth;
   static const int kFixedIndexShift =
       kVirtualRegisterShift + kVirtualRegisterWidth;
+  static const int kFixedIndexWidth = 32 - kFixedIndexShift;
+  STATIC_ASSERT(kFixedIndexWidth > 5);
 
   class PolicyField : public BitField<Policy, kPolicyShift, kPolicyWidth> { };
 
@@ -154,8 +156,8 @@ class LUnallocated: public LOperand {
   };
 
   static const int kMaxVirtualRegisters = 1 << kVirtualRegisterWidth;
-  static const int kMaxFixedIndex = 63;
-  static const int kMinFixedIndex = -64;
+  static const int kMaxFixedIndex = (1 << kFixedIndexWidth) - 1;
+  static const int kMinFixedIndex = -(1 << kFixedIndexWidth);
 
   bool HasAnyPolicy() const {
     return policy() == ANY;