Changeset 35639 in webkit for trunk/JavaScriptCore/kjs/collector.cpp

Timestamp:

Aug 8, 2008, 2:48:10 AM (17 years ago)

Author:

[email protected]

Message:

Improve performance of arithmetic operators

Reviewed by Cameron Zwarich

Added a fast (non-virtual) mechanism to determine if a non-immediate JSValue*
is a JSNumberCell. We then use this to allow improved specialisation in many
arithmetic operators. SunSpider reports a 2.5% progression overall, with greater
than 10% progressions on a number of arithmetic heavy tests.

File:

• trunk/JavaScriptCore/kjs/collector.cpp (modified) (3 diffs)

trunk/JavaScriptCore/kjs/collector.cpp

@@ -160 +160 @@
 }
 
+template <Heap::HeapType heapType>
 static NEVER_INLINE CollectorBlock* allocateBlock()
 {
@@ -200 +201 @@
     memset(reinterpret_cast<void*>(address), 0, BLOCK_SIZE);
 #endif
-
+    reinterpret_cast<CollectorBlock*>(address)->type = heapType;
     return reinterpret_cast<CollectorBlock*>(address);
 }
@@ -347 +348 @@
         }
 
-        targetBlock = (Block*)allocateBlock();
+        targetBlock = (Block*)allocateBlock<heapType>();
         targetBlock->freeList = targetBlock->cells;
         targetBlock->heap = this;