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

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
===================================================================
--- src/x64/lithium-x64.h	(revision 10969)
+++ src/x64/lithium-x64.h	(working copy)
@@ -2204,6 +2204,15 @@
   HYDROGEN_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 #undef DECLARE_DO
 
+  static bool SupportsMathFloorOfDiv() { return false; }
+  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,