Changeset 36401 in webkit for trunk/JavaScriptCore/masm

Timestamp:

Sep 14, 2008, 1:18:49 AM (17 years ago)

Author:

[email protected]

Message:

Bug 20821: Cache property transitions to speed up object initialization
​https://bugs.webkit.org/show_bug.cgi?id=20821

Reviewed by Cameron Zwarich.

Implement a transition cache to improve the performance of new properties
being added to objects. This is extremely beneficial in constructors and
shows up as a 34% improvement on access-binary-trees in SunSpider (0.8%
overall)

File:

• trunk/JavaScriptCore/masm/X86Assembler.h (modified) (2 diffs)

trunk/JavaScriptCore/masm/X86Assembler.h

@@ -292 +292 @@
     }
 
+    void addl_i8m(int imm, void* addr)
+    {
+        m_buffer->putByte(OP_GROUP1_EvIb);
+        emitModRm_opm(GROUP1_OP_ADD, addr);
+        m_buffer->putByte(imm);
+    }
+
     void addl_i32r(int imm, RegisterID dst)
     {
@@ -395 +402 @@
         m_buffer->putByte(OP_GROUP1_EvIb);
         emitModRm_opr(GROUP1_OP_SUB, dst);
+        m_buffer->putByte(imm);
+    }
+    
+    void subl_i8m(int imm, void* addr)
+    {
+        m_buffer->putByte(OP_GROUP1_EvIb);
+        emitModRm_opm(GROUP1_OP_SUB, addr);
         m_buffer->putByte(imm);
     }