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//===-- ConstantDivision.h --------------------------------------*- C++ -*-===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef __UTIL_CONSTANTDIVISION_H__
#define __UTIL_CONSTANTDIVISION_H__
#include <stdint.h>
namespace klee {
/// ComputeMultConstants64 - Compute add and sub such that add-sub==x,
/// while attempting to minimize the number of bits in add and sub
/// combined.
void ComputeMultConstants64(uint64_t x, uint64_t &add_out,
uint64_t &sub_out);
/// Compute the constants to perform a quicker equivalent of a division of some
/// 32-bit unsigned integer n by a known constant d (also a 32-bit unsigned
/// integer). The constants to compute n/d without explicit division will be
/// stored in mprime, sh1, and sh2 (unsigned 32-bit integers).
///
/// @param d - denominator (divisor)
///
/// @param [out] mprime
/// @param [out] sh1
/// @param [out] sh2
void ComputeUDivConstants32(uint32_t d, uint32_t &mprime, uint32_t &sh1,
uint32_t &sh2);
/// Compute the constants to perform a quicker equivalent of a division of some
/// 32-bit signed integer n by a known constant d (also a 32-bit signed
/// integer). The constants to compute n/d without explicit division will be
/// stored in mprime, dsign, and shpost (signed 32-bit integers).
///
/// @param d - denominator (divisor)
///
/// @param [out] mprime
/// @param [out] dsign
/// @param [out] shpost
void ComputeSDivConstants32(int32_t d, int32_t &mprime, int32_t &dsign,
int32_t &shpost);
}
#endif
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