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

src/compiler-intrinsics.h

Index: src/compiler-intrinsics.h
===================================================================
--- src/compiler-intrinsics.h	(revision 10969)
+++ src/compiler-intrinsics.h	(working copy)
@@ -40,6 +40,9 @@
   // Returns number of zero bits following most significant 1 bit.
   // Undefined for zero value.
   INLINE(static int CountLeadingZeros(uint32_t value));
+
+  // Returns the number of bits set.
+  INLINE(static int CountSetBits(uint32_t value));
 };
 
 #ifdef __GNUC__
@@ -51,6 +54,10 @@
   return __builtin_clz(value);
 }
 
+int CompilerIntrinsics::CountSetBits(uint32_t value) {
+  return __builtin_popcount(value);
+}
+
 #elif defined(_MSC_VER)
 
 #pragma intrinsic(_BitScanForward)
@@ -68,6 +75,10 @@
   return 31 - static_cast<int>(result);
 }
 
+int CompilerIntrinsics::CountSetBits(uint32_t value) {
+  return __popcnt(value);
+}
+
 #else
 #error Unsupported compiler
 #endif