[v8-dev] Optimise Math.floor(x/y) to use integer division for specific divisor....

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
===================================================================
--- src/ia32/lithium-ia32.h	(revision 10969)
+++ src/ia32/lithium-ia32.h	(working copy)
@@ -2341,6 +2341,15 @@
   HYDROGEN_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 #undef DECLARE_DO
 
+  static bool SupportsMathFloorOfDiv() { return false; }

[fschneider, 2012/03/28 09:59:18]

I'd add those function only when we add this optimization to ia32. By using a
#ifdef in hydrogen-instructions.cc for the time being we can avoid adding unused
code to the other platforms.

[Alexandre, 2012/03/28 16:27:38]

Done.

+  static bool HasMagicNumberForDivisor(int32_t divisor) { return false; }
+  static HValue* SimplifiedDividendForMathFloorOfDiv(HValue* val) {
+    return NULL;
+  }
+  static HValue* SimplifiedDivisorForMathFloorOfDiv(HValue* val) {
+    return NULL;
+  }
+
  private:
   enum Status {
     UNUSED,