Handle non-power-of-2 divisors in division-like operations

src/utils.h

 // Copyright 2012 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 87 matching lines @@
     x >>= 8;
   }
   if (x & 0xf0) {
     nibble += 4;
     x >>= 4;
   }
   return nibble + msb4[x];
 }
 
 
-// Magic numbers for integer division.
-// These are kind of 2's complement reciprocal of the divisors.
-// Details and proofs can be found in:
-// - Hacker's Delight, Henry S. Warren, Jr.
-// - The PowerPC Compiler Writer’s Guide
-// and probably many others.
-// See details in the implementation of the algorithm in
-// lithium-codegen-arm.cc : LCodeGen::TryEmitSignedIntegerDivisionByConstant().
-struct DivMagicNumbers {
-  unsigned M;
-  unsigned s;
-};
-
-const DivMagicNumbers InvalidDivMagicNumber= {0, 0};
-const DivMagicNumbers DivMagicNumberFor3   = {0x55555556, 0};
-const DivMagicNumbers DivMagicNumberFor5   = {0x66666667, 1};
-const DivMagicNumbers DivMagicNumberFor7   = {0x92492493, 2};
-const DivMagicNumbers DivMagicNumberFor9   = {0x38e38e39, 1};
-const DivMagicNumbers DivMagicNumberFor11  = {0x2e8ba2e9, 1};
-const DivMagicNumbers DivMagicNumberFor25  = {0x51eb851f, 3};
-const DivMagicNumbers DivMagicNumberFor125 = {0x10624dd3, 3};
-const DivMagicNumbers DivMagicNumberFor625 = {0x68db8bad, 8};
-
-const DivMagicNumbers DivMagicNumberFor(int32_t divisor);
-
-
 // The C++ standard leaves the semantics of '>>' undefined for
 // negative signed operands. Most implementations do the right thing,
 // though.
 inline int ArithmeticShiftRight(int x, int s) {
   return x >> s;
 }
 
 
 // Compute the 0-relative offset of some absolute value x of type T.
 // This allows conversion of Addresses and integral types into
@@ skipping 1084 matching lines @@
   iterator end() { return container_->end(); }
   reverse_iterator rbegin() { return container_->rbegin(); }
   reverse_iterator rend() { return container_->rend(); }
  private:
   C* container_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_UTILS_H_