js/src/jit/ReciprocalMulConstants.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: set ts=8 sts=2 et sw=2 tw=80:
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef jit_ReciprocalMulConstants_h
   8 #define jit_ReciprocalMulConstants_h
   9
  10 #include <stdint.h>
  11
  12 namespace js::jit {
  13
  14 struct ReciprocalMulConstants {
  15   int64_t multiplier;
  16   int32_t shiftAmount;
  17
  18   static ReciprocalMulConstants computeSignedDivisionConstants(uint32_t d) {
  19     return computeDivisionConstants(d, 31);
  20   }
  21
  22   static ReciprocalMulConstants computeUnsignedDivisionConstants(uint32_t d) {
  23     return computeDivisionConstants(d, 32);
  24   }
  25
  26  private:
  27   static ReciprocalMulConstants computeDivisionConstants(uint32_t d,
  28                                                          int maxLog);
  29 };
  30
  31 }  // namespace js::jit
  32
  33 #endif /* jit_ReciprocalMulConstants_h */