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

src/lithium.h

Index: src/lithium.h
diff --git a/src/lithium.h b/src/lithium.h
index e1cd52aa0acc4e9642c7c3f9ef14646de6290a04..fdc61cb6fef3a316c8555433166a690d99e70a5f 100644
--- a/src/lithium.h
+++ b/src/lithium.h
@@ -153,7 +153,10 @@ class LUnallocated: public LOperand {
                         kVirtualRegisterWidth> {
   };
 
-  static const int kMaxVirtualRegisters = 1 << kVirtualRegisterWidth;
+  // kMaxVirtualRegisters should not exceed 1 << kVirtualRegisterWidth but we
+  // are setting it to a lower value otherwise crankshaft is too slow.
+  STATIC_ASSERT(kVirtualRegisterWidth > 13);
+  static const int kMaxVirtualRegisters = 1 << 13;

[Vyacheslav Egorov (Google), 2012/09/21 11:42:08]

can you give some of this bits to other fields?

if you increase kMax/MinFixedIndex it will help Issue 2223. 

   static const int kMaxFixedIndex = 63;
   static const int kMinFixedIndex = -64;