This is gmp.info, produced by makeinfo version 4.0 from gmp.texi. INFO-DIR-SECTION GNU libraries START-INFO-DIR-ENTRY * gmp: (gmp). GNU Multiple Precision Arithmetic Library. END-INFO-DIR-ENTRY This file documents GNU MP, a library for arbitrary-precision arithmetic. Copyright (C) 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc. Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Permission is granted to copy and distribute translations of this manual into another language, under the above conditions for modified versions, except that this permission notice may be stated in a translation approved by the Foundation.  File: gmp.info, Node: Low-level Functions, Next: Random Number Functions, Prev: Floating-point Functions, Up: Top Low-level Functions ******************* This chapter describes low-level GMP functions, used to implement the high-level GMP functions, but also intended for time-critical user code. These functions start with the prefix `mpn_'. The `mpn' functions are designed to be as fast as possible, *not* to provide a coherent calling interface. The different functions have somewhat similar interfaces, but there are variations that make them hard to use. These functions do as little as possible apart from the real multiple precision computation, so that no time is spent on things that not all callers need. A source operand is specified by a pointer to the least significant limb and a limb count. A destination operand is specified by just a pointer. It is the responsibility of the caller to ensure that the destination has enough space for storing the result. With this way of specifying operands, it is possible to perform computations on subranges of an argument, and store the result into a subrange of a destination. A common requirement for all functions is that each source area needs at least one limb. No size argument may be zero. Unless otherwise stated, in-place operations are allowed where source and destination are the same, but not where they only partly overlap. The `mpn' functions are the base for the implementation of the `mpz_', `mpf_', and `mpq_' functions. This example adds the number beginning at S1P and the number beginning at S2P and writes the sum at DESTP. All areas have SIZE limbs. cy = mpn_add_n (destp, s1p, s2p, size) In the notation used here, a source operand is identified by the pointer to the least significant limb, and the limb count in braces. For example, {s1p, s1size}. - Function: mp_limb_t mpn_add_n (mp_limb_t *RP, const mp_limb_t *S1P, const mp_limb_t *S2P, mp_size_t SIZE) Add {S1P, SIZE} and {S2P, SIZE}, and write the SIZE least significant limbs of the result to RP. Return carry, either 0 or 1. This is the lowest-level function for addition. It is the preferred function for addition, since it is written in assembly for most targets. For addition of a variable to itself (i.e., S1P equals S2P, use `mpn_lshift' with a count of 1 for optimal speed. - Function: mp_limb_t mpn_add_1 (mp_limb_t *RP, const mp_limb_t *S1P, mp_size_t SIZE, mp_limb_t S2LIMB) Add {S1P, SIZE} and S2LIMB, and write the SIZE least significant limbs of the result to RP. Return carry, either 0 or 1. - Function: mp_limb_t mpn_add (mp_limb_t *RP, const mp_limb_t *S1P, mp_size_t S1SIZE, const mp_limb_t *S2P, mp_size_t S2SIZE) Add {S1P, S1SIZE} and {S2P, S2SIZE}, and write the S1SIZE least significant limbs of the result to RP. Return carry, either 0 or 1. This function requires that S1SIZE is greater than or equal to S2SIZE. - Function: mp_limb_t mpn_sub_n (mp_limb_t *RP, const mp_limb_t *S1P, const mp_limb_t *S2P, mp_size_t SIZE) Subtract {S2P, S2SIZE} from {S1P, SIZE}, and write the SIZE least significant limbs of the result to RP. Return borrow, either 0 or 1. This is the lowest-level function for subtraction. It is the preferred function for subtraction, since it is written in assembly for most targets. - Function: mp_limb_t mpn_sub_1 (mp_limb_t *RP, const mp_limb_t *S1P, mp_size_t SIZE, mp_limb_t S2LIMB) Subtract S2LIMB from {S1P, SIZE}, and write the SIZE least significant limbs of the result to RP. Return borrow, either 0 or 1. - Function: mp_limb_t mpn_sub (mp_limb_t *RP, const mp_limb_t *S1P, mp_size_t S1SIZE, const mp_limb_t *S2P, mp_size_t S2SIZE) Subtract {S2P, S2SIZE} from {S1P, S1SIZE}, and write the S1SIZE least significant limbs of the result to RP. Return borrow, either 0 or 1. This function requires that S1SIZE is greater than or equal to S2SIZE. - Function: void mpn_mul_n (mp_limb_t *RP, const mp_limb_t *S1P, const mp_limb_t *S2P, mp_size_t SIZE) Multiply {S1P, SIZE} and {S2P, SIZE}, and write the *entire* result to RP. The destination has to have space for 2*SIZE limbs, even if the significant result might be one limb smaller. - Function: mp_limb_t mpn_mul_1 (mp_limb_t *RP, const mp_limb_t *S1P, mp_size_t SIZE, mp_limb_t S2LIMB) Multiply {S1P, SIZE} and S2LIMB, and write the SIZE least significant limbs of the product to RP. Return the most significant limb of the product. This is a low-level function that is a building block for general multiplication as well as other operations in GMP. It is written in assembly for most targets. Don't call this function if S2LIMB is a power of 2; use `mpn_lshift' with a count equal to the logarithm of S2LIMB instead, for optimal speed. - Function: mp_limb_t mpn_addmul_1 (mp_limb_t *RP, const mp_limb_t *S1P, mp_size_t SIZE, mp_limb_t S2LIMB) Multiply {S1P, SIZE} and S2LIMB, and add the SIZE least significant limbs of the product to {RP, SIZE} and write the result to RP. Return the most significant limb of the product, plus carry-out from the addition. This is a low-level function that is a building block for general multiplication as well as other operations in GMP. It is written in assembly for most targets. - Function: mp_limb_t mpn_submul_1 (mp_limb_t *RP, const mp_limb_t *S1P, mp_size_t SIZE, mp_limb_t S2LIMB) Multiply {S1P, SIZE} and S2LIMB, and subtract the SIZE least significant limbs of the product from {RP, SIZE} and write the result to RP. Return the most significant limb of the product, minus borrow-out from the subtraction. This is a low-level function that is a building block for general multiplication and division as well as other operations in GMP. It is written in assembly for most targets. - Function: mp_limb_t mpn_mul (mp_limb_t *RP, const mp_limb_t *S1P, mp_size_t S1SIZE, const mp_limb_t *S2P, mp_size_t S2SIZE) Multiply {S1P, S1SIZE} and {S2P, S2SIZE}, and write the result to RP. Return the most significant limb of the result. The destination has to have space for S1SIZE + S2SIZE limbs, even if the result might be one limb smaller. This function requires that S1SIZE is greater than or equal to S2SIZE. The destination must be distinct from either input operands. - Function: mp_limb_t mpn_tdiv_qr (mp_limb_t *QP, mp_limb_t *RP, mp_size_t QXN, const mp_limb_t *NP, mp_size_t NN, const mp_limb_t *DP, mp_size_t DN) Divide {NP, NN} by {DP, DN}. Write the quotient at QP and the remainder at RP. The quotient written at QP will be NN - DN + 1 limbs. The remainder written at RP will be DN limbs. It is required that NN is greater than or equal to DN. The QXN operand must be zero. The quotient is rounded towards 0. No overlap between arguments is permitted. - Function: mp_limb_t mpn_divrem (mp_limb_t *R1P, mp_size_t XSIZE, mp_limb_t *RS2P, mp_size_t RS2SIZE, const mp_limb_t *S3P, mp_size_t S3SIZE) [This function is obsolete. Please call `mpn_tdiv_qr' instead for best performance.] Divide {RS2P, RS2SIZE} by {S3P, S3SIZE}, and write the quotient at R1P, with the exception of the most significant limb, which is returned. The remainder replaces the dividend at RS2P; it will be S3SIZE limbs long (i.e., as many limbs as the divisor). In addition to an integer quotient, XSIZE fraction limbs are developed, and stored after the integral limbs. For most usages, XSIZE will be zero. It is required that RS2SIZE is greater than or equal to S3SIZE. It is required that the most significant bit of the divisor is set. If the quotient is not needed, pass RS2P + S3SIZE as R1P. Aside from that special case, no overlap between arguments is permitted. Return the most significant limb of the quotient, either 0 or 1. The area at R1P needs to be RS2SIZE - S3SIZE + XSIZE limbs large. - Function: mp_limb_t mpn_divrem_1 (mp_limb_t *R1P, mp_size_t XSIZE, mp_limb_t *S2P, mp_size_t S2SIZE, mp_limb_t S3LIMB) - Macro: mp_limb_t mpn_divmod_1 (mp_limb_t *R1P, mp_limb_t *S2P, mp_size_t S2SIZE, mp_limb_t S3LIMB) Divide {S2P, S2SIZE} by S3LIMB, and write the quotient at R1P. Return the remainder. The integer quotient is written to {R1P+XSIZE, S2SIZE} and in addition XSIZE fraction limbs are developed and written to {R1P, XSIZE}. Either or both S2SIZE and XSIZE can be zero. For most usages, XSIZE will be zero. `mpn_divmod_1' exists for upward source compatibility and is simply a macro calling `mpn_divrem_1' with an XSIZE of 0. The areas at R1P and S2P have to be identical or completely separate, not partially overlapping. - Function: mp_limb_t mpn_divmod (mp_limb_t *R1P, mp_limb_t *RS2P, mp_size_t RS2SIZE, const mp_limb_t *S3P, mp_size_t S3SIZE) *This interface is obsolete. It will disappear from future releases. Use `mpn_divrem' in its stead.* - Macro: mp_limb_t mpn_divexact_by3 (mp_limb_t *RP, mp_limb_t *SP, mp_size_t SIZE) - Function: mp_limb_t mpn_divexact_by3c (mp_limb_t *RP, mp_limb_t *SP, mp_size_t SIZE, mp_limb_t CARRY) Divide {SP, SIZE} by 3, expecting it to divide exactly, and writing the result to {RP, SIZE}. If 3 divides exactly, the return value is zero and the result is the quotient. If not, the return value is non-zero and the result won't be anything useful. `mpn_divexact_by3c' takes an initial carry parameter, which can be the return value from a previous call, so a large calculation can be done piece by piece. `mpn_divexact_by3' is simply a macro calling `mpn_divexact_by3c' with a 0 carry parameter. These routines use a multiply-by-inverse and will be faster than `mpn_divrem_1' on CPUs with fast multiplication but slow division. The source a, result q, size n, initial carry i, and return value c satisfy c*b^n + a-i = 3*q, where b is the size of a limb (2^32 or 2^64). c is always 0, 1 or 2, and the initial carry must also be 0, 1 or 2 (these are both borrows really). When c=0, clearly q=(a-i)/3. When c!=0, the remainder (a-i) mod 3 is given by 3-c, because b == 1 mod 3. - Function: mp_limb_t mpn_mod_1 (mp_limb_t *S1P, mp_size_t S1SIZE, mp_limb_t S2LIMB) Divide {S1P, S1SIZE} by S2LIMB, and return the remainder. S1SIZE can be zero. - Function: mp_limb_t mpn_preinv_mod_1 (mp_limb_t *S1P, mp_size_t S1SIZE, mp_limb_t S2LIMB, mp_limb_t S3LIMB) *This interface is obsolete. It will disappear from future releases. Use `mpn_mod_1' in its stead.* - Function: mp_limb_t mpn_bdivmod (mp_limb_t *RP, mp_limb_t *S1P, mp_size_t S1SIZE, const mp_limb_t *S2P, mp_size_t S2SIZE, unsigned long int D) The function puts the low [D/BITS_PER_MP_LIMB] limbs of Q = {S1P, S1SIZE}/{S2P, S2SIZE} mod 2^D at RP, and returns the high D mod BITS_PER_MP_LIMB bits of Q. {S1P, S1SIZE} - Q * {S2P, S2SIZE} mod 2^(S1SIZE*BITS_PER_MP_LIMB) is placed at S1P. Since the low [D/BITS_PER_MP_LIMB] limbs of this difference are zero, it is possible to overwrite the low limbs at S1P with this difference, provided RP <= S1P. This function requires that S1SIZE * BITS_PER_MP_LIMB >= D, and that {S2P, S2SIZE} is odd. *This interface is preliminary. It might change incompatibly in future revisions.* - Function: mp_limb_t mpn_lshift (mp_limb_t *RP, const mp_limb_t *SRC_PTR, mp_size_t SRC_SIZE, unsigned long int COUNT) Shift {SRC_PTR, SRC_SIZE} COUNT bits to the left, and write the SRC_SIZE least significant limbs of the result to RP. COUNT might be in the range 1 to n - 1, on an n-bit machine. The bits shifted out to the left are returned. Overlapping of the destination space and the source space is allowed in this function, provided RP >= SRC_PTR. This function is written in assembly for most targets. - Function: mp_limp_t mpn_rshift (mp_limb_t *RP, const mp_limb_t *SRC_PTR, mp_size_t SRC_SIZE, unsigned long int COUNT) Shift {SRC_PTR, SRC_SIZE} COUNT bits to the right, and write the SRC_SIZE most significant limbs of the result to RP. COUNT might be in the range 1 to n - 1, on an n-bit machine. The bits shifted out to the right are returned. Overlapping of the destination space and the source space is allowed in this function, provided RP <= SRC_PTR. This function is written in assembly for most targets. - Function: int mpn_cmp (const mp_limb_t *S1P, const mp_limb_t *S2P, mp_size_t SIZE) Compare {S1P, SIZE} and {S2P, SIZE} and return a positive value if s1 > src2, 0 of they are equal, and a negative value if s1 < src2. - Function: mp_size_t mpn_gcd (mp_limb_t *RP, mp_limb_t *S1P, mp_size_t S1SIZE, mp_limb_t *S2P, mp_size_t S2SIZE) Puts at RP the greatest common divisor of {S1P, S1SIZE} and {S2P, S2SIZE}; both source operands are destroyed by the operation. The size in limbs of the greatest common divisor is returned. {S1P, S1SIZE} must have at least as many bits as {S2P, S2SIZE}, and {S2P, S2SIZE} must be odd. - Function: mp_limb_t mpn_gcd_1 (const mp_limb_t *S1P, mp_size_t S1SIZE, mp_limb_t S2LIMB) Return the greatest common divisor of {S1P, S1SIZE} and S2LIMB, where S2LIMB (as well as S1SIZE) must be different from 0. - Function: mp_size_t mpn_gcdext (mp_limb_t *R1P, mp_limb_t *R2P, mp_size_t *R2SIZE, mp_limb_t *S1P, mp_size_t S1SIZE, mp_limb_t *S2P, mp_size_t S2SIZE) Compute the greatest common divisor of {S1P, S1SIZE} and {S2P, S2SIZE}. Store the gcd at R1P and return its size in limbs. Write the first cofactor at R2P and store its size in *R2SIZE. If the cofactor is negative, *R2SIZE is negative and R2P is the absolute value of the cofactor. {S1P, S1SIZE} must be greater than or equal to {S2P, S2SIZE}. Neither operand may equal 0. Both source operands are destroyed, plus one limb past the end of each, ie. {S1P, S1SIZE+1} and {S2P, S2SIZE+1}. - Function: mp_size_t mpn_sqrtrem (mp_limb_t *R1P, mp_limb_t *R2P, const mp_limb_t *SP, mp_size_t SIZE) Compute the square root of {SP, SIZE} and put the result at R1P. Write the remainder at R2P, unless R2P is `NULL'. Return the size of the remainder, whether R2P was `NULL' or non-`NULL'. Iff the operand was a perfect square, the return value will be 0. The areas at R1P and SP have to be distinct. The areas at R2P and SP have to be identical or completely separate, not partially overlapping. The area at R1P needs to have space for ceil(SIZE/2) limbs. The area at R2P needs to be SIZE limbs large. - Function: mp_size_t mpn_get_str (unsigned char *STR, int BASE, mp_limb_t *S1P, mp_size_t S1SIZE) Convert {S1P, S1SIZE} to a raw unsigned char array in base BASE. The string is not in ASCII; to convert it to printable format, add the ASCII codes for `0' or `A', depending on the base and range. There may be leading zeros in the string. The area at S1P is clobbered. Return the number of characters in STR. The area at STR has to have space for the largest possible number represented by a S1SIZE long limb array, plus one extra character. - Function: mp_size_t mpn_set_str (mp_limb_t *R1P, const char *STR, size_t STRSIZE, int BASE) Convert the raw unsigned char array at STR of length STRSIZE to a limb array {S1P, S1SIZE}. The base of STR is BASE. Return the number of limbs stored in R1P. - Function: unsigned long int mpn_scan0 (const mp_limb_t *S1P, unsigned long int BIT) Scan S1P from bit position BIT for the next clear bit. It is required that there be a clear bit within the area at S1P at or beyond bit position BIT, so that the function has something to return. - Function: unsigned long int mpn_scan1 (const mp_limb_t *S1P, unsigned long int BIT) Scan S1P from bit position BIT for the next set bit. It is required that there be a set bit within the area at S1P at or beyond bit position BIT, so that the function has something to return. - Function: void mpn_random (mp_limb_t *R1P, mp_size_t R1SIZE) - Function: void mpn_random2 (mp_limb_t *R1P, mp_size_t R1SIZE) Generate a random number of length R1SIZE and store it at R1P. The most significant limb is always non-zero. `mpn_random' generates uniformly distributed limb data, `mpn_random2' generates long strings of zeros and ones in the binary representation. `mpn_random2' is intended for testing the correctness of the `mpn' routines. - Function: unsigned long int mpn_popcount (const mp_limb_t *S1P, unsigned long int SIZE) Count the number of set bits in {S1P, SIZE}. - Function: unsigned long int mpn_hamdist (const mp_limb_t *S1P, const mp_limb_t *S2P, unsigned long int SIZE) Compute the hamming distance between {S1P, SIZE} and {S2P, SIZE}. - Function: int mpn_perfect_square_p (const mp_limb_t *S1P, mp_size_t SIZE) Return non-zero iff {S1P, SIZE} is a perfect square.  File: gmp.info, Node: Random Number Functions, Next: BSD Compatible Functions, Prev: Low-level Functions, Up: Top Random Number Functions *********************** There are two groups of random number functions in GNU MP; older functions that call C library random number generators, rely on a global state, and aren't very random; and newer functions that don't have these problems. The newer functions are self-contained, they accept a random state parameter that supplants global state, and generate good random numbers. The random state parameter is of the type `gmp_randstate_t'. It must be initialized by a call to one of the `gmp_randinit' functions (*Note Random State Initialization::). The initial seed is set using one of the `gmp_randseed' functions (*Note Random State Initialization::). The size of the seed determines the number of different sequences of random numbers that is possible to generate. The "quality" of the seed is the randomness of a given seed compared to the previous seed used and affects the randomness of separate number sequences. The algorithm for assigning seed is critical if the generated random numbers are to be used for important applications, such as generating cryptographic keys. The traditional method is to use the current system time for seeding. One has to be careful when using the current time though. If the application seeds the random functions very often, say several times per second, and the resolution of the system clock is comparatively low, like one second, the same sequence of numbers will be generated until the system clock ticks. Furthermore, the current system time is quite easy to guess, so a system depending on any unpredictability of the random number sequence should absolutely not use that as its only source for a seed value. On some systems there is a special device, often called `/dev/random', which provides a source of somewhat random numbers more usable as seed. The functions actually generating random functions are documented under "Miscellaneous Functions" in their respective function class: *Note Miscellaneous Integer Functions::, *Note Miscellaneous Float Functions::. * Menu: * Random State Initialization:: How to initialize a random state.  File: gmp.info, Node: Random State Initialization, Prev: Random Number Functions, Up: Random Number Functions Random State Initialization =========================== See *Note Random Number Functions:: for a discussion on how to choose the initial seed value passed to these functions. - Function: void gmp_randinit (gmp_randstate_t STATE, gmp_randalg_t ALG, ...) Initialize random state variable STATE. ALG denotes what algorithm to use for random number generation. Use one of - GMP_RAND_ALG_LC -- Linear congruential. A fast generator defined by X = (aX + c) mod m. A third argument SIZE of type unsigned long int is required. SIZE is the size of the largest good quality random number to be generated, expressed in number of bits. If the random generation functions are asked for a bigger random number than indicated by this parameter, two or more numbers of SIZE bits will be generated and concatenated, resulting in a "bad" random number. This can be used to generate big random numbers relatively cheap if the quality of randomness isn't of great importance. a, c, and m are picked from a table where the modulus (m) is a power of 2 and the multiplier is congruent to 5 (mod 8). The choice is based on the SIZE parameter. The maximum SIZE supported by this algorithm is 128. If you need bigger random numbers, use your own scheme and call one of the other `gmp_randinit' functions. If ALG is 0 or GMP_RAND_ALG_DEFAULT, the default algorithm is used. The default algorithm is typically a fast algorithm like the linear congruential and requires a third SIZE argument (see GMP_RAND_ALG_LC). When you're done with a STATE variable, call `gmp_randclear' to deallocate any memory allocated by this function. `gmp_randinit' may set the following bits in GMP_ERRNO: * GMP_ERROR_UNSUPPORTED_ARGUMENT -- ALG is unsupported * GMP_ERROR_INVALID_ARGUMENT -- SIZE is too big - Function: void gmp_randinit_lc_2exp (gmp_randstate_t STATE, mpz_t A, unsigned long int C, unsigned long int M2EXP) Initialize random state variable STATE with given linear congruential scheme. Parameters A, C, and M2EXP are the multiplier, adder, and modulus for the linear congruential scheme to use, respectively. The modulus is expressed as a power of 2, so that M = 2^M2EXP. The least significant bits of a random number generated by the linear congruential algorithm where the modulus is a power of two are not very random. Therefore, the lower half of a random number generated by an LC scheme initialized with this function is discarded. Thus, the size of a random number is M2EXP / 2 (rounded upwards) bits when this function has been used for initializing the random state. When you're done with a STATE variable, call `gmp_randclear' to deallocate any memory allocated by this function. - Function: void gmp_randseed (gmp_randstate_t STATE, mpz_t SEED) - Function: void gmp_randseed_ui (gmp_randstate_t STATE, unsigned long int SEED) Set the initial seed value. Parameter SEED is the initial random seed. The function `gmp_randseed_ui' takes the SEED as an unsigned long int rather than as an mpz_t. - Function: void gmp_randclear (gmp_randstate_t STATE) Free all memory occupied by STATE. Make sure to call this function for all `gmp_randstate_t' variables when you are done with them.  File: gmp.info, Node: BSD Compatible Functions, Next: Custom Allocation, Prev: Random Number Functions, Up: Top Berkeley MP Compatible Functions ******************************** These functions are intended to be fully compatible with the Berkeley MP library which is available on many BSD derived U*ix systems. The `--enable-mpbsd' option must be used when building GNU MP to make these available (*note Installing GMP::). The original Berkeley MP library has a usage restriction: you cannot use the same variable as both source and destination in a single function call. The compatible functions in GNU MP do not share this restriction--inputs and outputs may overlap. It is not recommended that new programs are written using these functions. Apart from the incomplete set of functions, the interface for initializing `MINT' objects is more error prone, and the `pow' function collides with `pow' in `libm.a'. Include the header `mp.h' to get the definition of the necessary types and functions. If you are on a BSD derived system, make sure to include GNU `mp.h' if you are going to link the GNU `libmp.a' to your program. This means that you probably need to give the -I option to the compiler, where is the directory where you have GNU `mp.h'. - Function: MINT * itom (signed short int INITIAL_VALUE) Allocate an integer consisting of a `MINT' object and dynamic limb space. Initialize the integer to INITIAL_VALUE. Return a pointer to the `MINT' object. - Function: MINT * xtom (char *INITIAL_VALUE) Allocate an integer consisting of a `MINT' object and dynamic limb space. Initialize the integer from INITIAL_VALUE, a hexadecimal, '\0'-terminate C string. Return a pointer to the `MINT' object. - Function: void move (MINT *SRC, MINT *DEST) Set DEST to SRC by copying. Both variables must be previously initialized. - Function: void madd (MINT *SRC_1, MINT *SRC_2, MINT *DESTINATION) Add SRC_1 and SRC_2 and put the sum in DESTINATION. - Function: void msub (MINT *SRC_1, MINT *SRC_2, MINT *DESTINATION) Subtract SRC_2 from SRC_1 and put the difference in DESTINATION. - Function: void mult (MINT *SRC_1, MINT *SRC_2, MINT *DESTINATION) Multiply SRC_1 and SRC_2 and put the product in DESTINATION. - Function: void mdiv (MINT *DIVIDEND, MINT *DIVISOR, MINT *QUOTIENT, MINT *REMAINDER) - Function: void sdiv (MINT *DIVIDEND, signed short int DIVISOR, MINT *QUOTIENT, signed short int *REMAINDER) Set QUOTIENT to DIVIDEND/DIVISOR, and REMAINDER to DIVIDEND mod DIVISOR. The quotient is rounded towards zero; the remainder has the same sign as the dividend unless it is zero. Some implementations of these functions work differently--or not at all--for negative arguments. - Function: void msqrt (MINT *OPERAND, MINT *ROOT, MINT *REMAINDER) Set ROOT to the truncated integer part of the square root of OPERAND. Set REMAINDER to OPERAND-ROOT*ROOT, (i.e., zero if OPERAND is a perfect square). If ROOT and REMAINDER are the same variable, the results are undefined. - Function: void pow (MINT *BASE, MINT *EXP, MINT *MOD, MINT *DEST) Set DEST to (BASE raised to EXP) modulo MOD. - Function: void rpow (MINT *BASE, signed short int EXP, MINT *DEST) Set DEST to BASE raised to EXP. - Function: void gcd (MINT *OPERAND1, MINT *OPERAND2, MINT *RES) Set RES to the greatest common divisor of OPERAND1 and OPERAND2. - Function: int mcmp (MINT *OPERAND1, MINT *OPERAND2) Compare OPERAND1 and OPERAND2. Return a positive value if OPERAND1 > OPERAND2, zero if OPERAND1 = OPERAND2, and a negative value if OPERAND1 < OPERAND2. - Function: void min (MINT *DEST) Input a decimal string from `stdin', and put the read integer in DEST. SPC and TAB are allowed in the number string, and are ignored. - Function: void mout (MINT *SRC) Output SRC to `stdout', as a decimal string. Also output a newline. - Function: char * mtox (MINT *OPERAND) Convert OPERAND to a hexadecimal string, and return a pointer to the string. The returned string is allocated using the default memory allocation function, `malloc' by default. - Function: void mfree (MINT *OPERAND) De-allocate, the space used by OPERAND. *This function should only be passed a value returned by `itom' or `xtom'.*  File: gmp.info, Node: Custom Allocation, Next: Contributors, Prev: BSD Compatible Functions, Up: Top Custom Allocation ***************** By default, GMP uses `malloc', `realloc' and `free' for memory allocation. If `malloc' or `realloc' fails, GMP prints a message to the standard error output and terminates execution. Some applications might want to allocate memory in other ways, or might not want a fatal error when there is no more memory available. To accomplish this, you can specify alternative memory allocation functions. This can be done in the Berkeley compatibility library as well as the main GMP library. - Function: void mp_set_memory_functions ( void *(*ALLOC_FUNC_PTR) (size_t), void *(*REALLOC_FUNC_PTR) (void *, size_t, size_t), void (*FREE_FUNC_PTR) (void *, size_t)) Replace the current allocation functions from the arguments. If an argument is `NULL', the corresponding default function is retained. *Be sure to call this function only when there are no active GMP objects allocated using the previous memory functions! Usually, that means that you have to call this function before any other GMP function.* The functions you supply should fit the following declarations: - Function: void * allocate_function (size_t ALLOC_SIZE) This function should return a pointer to newly allocated space with at least ALLOC_SIZE storage units. - Function: void * reallocate_function (void *PTR, size_t OLD_SIZE, size_t NEW_SIZE) This function should return a pointer to newly allocated space of at least NEW_SIZE storage units, after copying at least the first OLD_SIZE storage units from PTR. It should also de-allocate the space at PTR. You can assume that the space at PTR was formerly returned from `allocate_function' or `reallocate_function', for a request for OLD_SIZE storage units. - Function: void deallocate_function (void *PTR, size_t SIZE) De-allocate the space pointed to by PTR. You can assume that the space at PTR was formerly returned from `allocate_function' or `reallocate_function', for a request for SIZE storage units. (A "storage unit" is the unit in which the `sizeof' operator returns the size of an object, normally an 8 bit byte.)  File: gmp.info, Node: Contributors, Next: References, Prev: Custom Allocation, Up: Top Contributors ************ Torbjorn Granlund wrote the original GMP library and is still developing and maintaining it. Several other individuals and organizations have contributed to GMP in various ways. Here is a list in chronological order: Gunnar Sjoedin and Hans Riesel helped with mathematical problems in early versions of the library. Richard Stallman contributed to the interface design and revised the first version of this manual. Brian Beuning and Doug Lea helped with testing of early versions of the library and made creative suggestions. John Amanatides of York University in Canada contributed the function `mpz_probab_prime_p'. Paul Zimmermann of Inria sparked the development of GMP 2, with his comparisons between bignum packages. Ken Weber (Kent State University, Universidade Federal do Rio Grande do Sul) contributed `mpz_gcd', `mpz_divexact', `mpn_gcd', and `mpn_bdivmod', partially supported by CNPq (Brazil) grant 301314194-2. Per Bothner of Cygnus Support helped to set up GMP to use Cygnus' configure. He has also made valuable suggestions and tested numerous intermediary releases. Joachim Hollman was involved in the design of the `mpf' interface, and in the `mpz' design revisions for version 2. Bennet Yee contributed the functions `mpz_jacobi' and `mpz_legendre'. Andreas Schwab contributed the files `mpn/m68k/lshift.S' and `mpn/m68k/rshift.S'. The development of floating point functions of GNU MP 2, were supported in part by the ESPRIT-BRA (Basic Research Activities) 6846 project POSSO (POlynomial System SOlving). GNU MP 2 was finished and released by SWOX AB (formerly known as TMG Datakonsult), Swedenborgsgatan 23, SE-118 27 STOCKHOLM, SWEDEN, in cooperation with the IDA Center for Computing Sciences, USA. Robert Harley of Inria, France and David Seal of ARM, England, suggested clever improvements for population count. Robert Harley also wrote highly optimized Karatsuba and 3-way Toom multiplication functions for GMP 3. He also contributed the ARM assembly code. Torsten Ekedahl of the Mathematical department of Stockholm University provided significant inspiration during several phases of the GMP development. His mathematical expertise helped improve several algorithms. Paul Zimmermann wrote the Burnikel-Ziegler division code, the REDC code, the REDC-based mpz_powm code, and the FFT multiply code. The ECMNET project Paul is organizing has been a driving force behind many of the optimization of GMP 3. Linus Nordberg wrote the new configure system based on autoconf and implemented the new random functions. Kent Boortz made the Macintosh port. Kevin Ryde wrote a lot of very high quality x86 code, optimized for most CPU variants. He also made countless other valuable contributions. Steve Root helped write the optimized alpha 21264 assembly code. GNU MP 3.1 was finished and released by Torbjorn Granlund and Kevin Ryde. Torbjorn's work was partially funded by the IDA Center for Computing Sciences, USA. (This list is chronological, not ordered after significance. If you have contributed to GMP but are not listed above, please tell about the omission!)  File: gmp.info, Node: References, Next: Concept Index, Prev: Contributors, Up: Top References ********** * Donald E. Knuth, "The Art of Computer Programming", vol 2, "Seminumerical Algorithms", 3rd edition, Addison-Wesley, 1988. * John D. Lipson, "Elements of Algebra and Algebraic Computing", The Benjamin Cummings Publishing Company Inc, 1981. * Richard M. Stallman, "Using and Porting GCC", Free Software Foundation, 1999, available online `http://www.gnu.org/software/gcc/onlinedocs/', and in the GCC package `ftp://ftp.gnu.org/pub/gnu/gcc/'. * Peter L. Montgomery, "Modular Multiplication Without Trial Division", in Mathematics of Computation, volume 44, number 170, April 1985. * Torbjorn Granlund and Peter L. Montgomery, "Division by Invariant Integers using Multiplication", in Proceedings of the SIGPLAN PLDI'94 Conference, June 1994. Available online, `ftp://ftp.cwi.nl/pub/pmontgom/divcnst.psa4.gz' (and .psl.gz too). * Tudor Jebelean, "An algorithm for exact division", Journal of Symbolic Computation, v. 15, 1993, pp. 169-180. Research report version available online `ftp://ftp.risc.uni-linz.ac.at/pub/techreports/1992/92-35.ps.gz' * Kenneth Weber, "The accelerated integer GCD algorithm", ACM Transactions on Mathematical Software, v. 21 (March), 1995, pp. 111-122. * Christoph Burnikel and Joachim Ziegler, "Fast Recursive Division", Max-Planck-Institut fuer Informatik Research Report MPI-I-98-1-022, `http://www.mpi-sb.mpg.de/~ziegler/TechRep.ps.gz'. * Alfred J. Menezes, Paul C. van Oorschot and Scott A. Vanstone, "Handbook of Applied Cryptography", `http://cacr.math.uwaterloo.ca/hac/'. * Henri Cohen, "A Course in Computational Algebraic Number Theory", Graduate Texts in Mathematics number 138, Springer-Verlag, 1993. Errata available online `http://www.math.u-bordeaux.fr/~cohen'  File: gmp.info, Node: Concept Index, Next: Function Index, Prev: References, Up: Top Concept Index ************* * Menu: * ABI: ABI and ISA. * About this manual: Introduction to GMP. * alloca: Build Options. * Allocation of memory: Custom Allocation. * Anonymous FTP of latest version: Getting the Latest Version of GMP. * Arithmetic functions <1>: Float Arithmetic. * Arithmetic functions <2>: Rational Arithmetic. * Arithmetic functions: Integer Arithmetic. * Assignment functions <1>: Assigning Floats. * Assignment functions: Assigning Integers. * Basics: GMP Basics. * Berkeley MP compatible functions: BSD Compatible Functions. * Binomial coefficient functions: Number Theoretic Functions. * Bit manipulation functions: Integer Logic and Bit Fiddling. * Bit shift left: Integer Arithmetic. * Bit shift right: Integer Division. * Bits per limb: Useful Macros and Constants. * BSD MP compatible functions: BSD Compatible Functions. * Bug reporting: Reporting Bugs. * Build notes for binary packaging: Notes for Package Builds. * Build notes for particular systems: Notes for Particular Systems. * Build options: Build Options. * Build problems known: Known Build Problems. * Comparison functions <1>: Integer Comparisons. * Comparison functions <2>: Comparing Rationals. * Comparison functions: Float Comparison. * Compatibility with older versions: Compatibility with older versions. * Conditions for copying GNU MP: Copying. * Configuring GMP: Installing GMP. * Constants: Useful Macros and Constants. * Contributors: Contributors. * Conventions for variables: GMP Variable Conventions. * Conversion functions <1>: Converting Integers. * Conversion functions: Converting Floats. * Copying conditions: Copying. * CPUs supported: Introduction to GMP. * Custom allocation: Custom Allocation. * Demonstration programs: Build Options. * Division functions <1>: Integer Division. * Division functions <2>: Rational Arithmetic. * Division functions: Float Arithmetic. * Exact division functions: Integer Division. * Example programs: Build Options. * Exponentiation functions <1>: Float Arithmetic. * Exponentiation functions: Integer Exponentiation. * Extended GCD: Number Theoretic Functions. * Factorial functions: Number Theoretic Functions. * Fibonacci sequence functions: Number Theoretic Functions. * Float arithmetic functions: Float Arithmetic. * Float assignment functions: Assigning Floats. * Float comparison functions: Float Comparison. * Float conversion functions: Converting Floats. * Float functions: Floating-point Functions. * Float init and assign functions: Simultaneous Float Init & Assign. * Float initialization functions: Initializing Floats. * Float input and output functions: I/O of Floats. * Float miscellaneous functions: Miscellaneous Float Functions. * Floating-point functions: Floating-point Functions. * Floating-point number: Nomenclature and Types. * FTP of latest version: Getting the Latest Version of GMP. * Function classes: Function Classes. * GMP version number: Useful Macros and Constants. * gmp.h: GMP Basics. * Greatest common divisor functions: Number Theoretic Functions. * Home page: Introduction to GMP. * I/O functions <1>: I/O of Rationals. * I/O functions <2>: I/O of Integers. * I/O functions: I/O of Floats. * Initialization and assignment functions <1>: Initializing Rationals. * Initialization and assignment functions <2>: Simultaneous Float Init & Assign. * Initialization and assignment functions: Simultaneous Integer Init & Assign. * Initialization functions <1>: Initializing Integers. * Initialization functions: Initializing Floats. * Input functions <1>: I/O of Floats. * Input functions <2>: I/O of Rationals. * Input functions: I/O of Integers. * Installing GMP: Installing GMP. * Integer: Nomenclature and Types. * Integer arithmetic functions: Integer Arithmetic. * Integer assignment functions: Assigning Integers. * Integer bit manipulation functions: Integer Logic and Bit Fiddling. * Integer comparison functions: Integer Comparisons. * Integer conversion functions: Converting Integers. * Integer division functions: Integer Division. * Integer exponentiation functions: Integer Exponentiation. * Integer functions: Integer Functions. * Integer init and assign: Simultaneous Integer Init & Assign. * Integer initialization functions: Initializing Integers. * Integer input and output functions: I/O of Integers. * Integer miscellaneous functions: Miscellaneous Integer Functions. * Integer random number functions: Integer Random Numbers. * Integer root functions: Integer Roots. * Introduction: Introduction to GMP. * ISA: ABI and ISA. * Jabobi symbol functions: Number Theoretic Functions. * Kronecker symbol functions: Number Theoretic Functions. * Latest version of GMP: Getting the Latest Version of GMP. * Least common multiple functions: Number Theoretic Functions. * Libtool versioning: Notes for Package Builds. * Limb: Nomenclature and Types. * Limb size: Useful Macros and Constants. * Logical functions: Integer Logic and Bit Fiddling. * Low-level functions: Low-level Functions. * Mailing list: Introduction to GMP. * Memory allocation: Custom Allocation. * Miscellaneous float functions: Miscellaneous Float Functions. * Miscellaneous integer functions: Miscellaneous Integer Functions. * Miscellaneous rational functions: Miscellaneous Rational Functions. * Modular inverse functions: Number Theoretic Functions. * mp.h: BSD Compatible Functions. * Multi-threading: GMP and Reentrancy. * Nomenclature: Nomenclature and Types. * Number theoretic functions: Number Theoretic Functions. * Numerator and denominator: Applying Integer Functions. * Output functions <1>: I/O of Floats. * Output functions <2>: I/O of Integers. * Output functions: I/O of Rationals. * Packaged builds: Notes for Package Builds. * Parameter conventions: GMP Variable Conventions. * Precision of floats: Floating-point Functions. * Prime testing functions: Number Theoretic Functions. * Random number functions <1>: Integer Random Numbers. * Random number functions: Random Number Functions. * Random number state: Random State Initialization. * Rational arithmetic functions: Rational Arithmetic. * Rational comparison functions: Comparing Rationals. * Rational init and assign: Initializing Rationals. * Rational input and output functions: I/O of Rationals. * Rational miscellaneous functions: Miscellaneous Rational Functions. * Rational number: Nomenclature and Types. * Rational number functions: Rational Number Functions. * Rational numerator and denominator: Applying Integer Functions. * Reentrancy: GMP and Reentrancy. * References: References. * Reporting bugs: Reporting Bugs. * Root extraction functions <1>: Float Arithmetic. * Root extraction functions: Integer Roots. * Stack overflow segfaults: Build Options. * Stripped libraries: Known Build Problems. * Thread safety: GMP and Reentrancy. * Types: Nomenclature and Types. * Upward compatibility: Compatibility with older versions. * Useful macros and constants: Useful Macros and Constants. * User-defined precision: Floating-point Functions. * Variable conventions: GMP Variable Conventions. * Version number: Useful Macros and Constants. * Web page: Introduction to GMP.