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Diffstat (limited to 'lib/Solver/ConstantDivision.h')
-rw-r--r-- | lib/Solver/ConstantDivision.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/lib/Solver/ConstantDivision.h b/lib/Solver/ConstantDivision.h new file mode 100644 index 00000000..9e3e9c95 --- /dev/null +++ b/lib/Solver/ConstantDivision.h @@ -0,0 +1,51 @@ +//===-- 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 |