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

src/utils.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 71 matching lines @@
   ASSERT(!is_finalized() && position_ < buffer_.length());
   buffer_[position_] = '\0';
   // Make sure nobody managed to add a 0-character to the
   // buffer while building the string.
   ASSERT(strlen(buffer_.start()) == static_cast<size_t>(position_));
   position_ = -1;
   ASSERT(is_finalized());
   return buffer_.start();
 }
 
+
+const DivMagicNumbers DivMagicNumberFor(int32_t divisor) {
+  switch (divisor) {
+    case 3:    return DivMagicNumberFor3;
+    case 5:    return DivMagicNumberFor5;
+    case 6:    return DivMagicNumberFor6;
+    case 7:    return DivMagicNumberFor7;
+    case 9:    return DivMagicNumberFor9;
+    case 10:   return DivMagicNumberFor10;
+    case 11:   return DivMagicNumberFor11;
+    case 12:   return DivMagicNumberFor12;
+    case 25:   return DivMagicNumberFor25;
+    case 125:  return DivMagicNumberFor125;
+    case 625:  return DivMagicNumberFor625;
+    default:   return InvalidDivMagicNumber;
+  }
+}
+
 } }  // namespace v8::internal