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Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 56 |
1 files changed, 56 insertions, 0 deletions
@@ -0,0 +1,56 @@ +NOTEWORTHY CHANGES IN GNU MP IN VERSION 2 + +* Division routines in the mpz class have changed. There are three classes of + functions, that rounds the quotient to -infinity, 0, and +infinity, + respectively. The first class of functions have names that begin with + mpz_fdiv (f is short for floor), the second class' names begin with mpz_tdiv + (t is short for trunc), and the third class' names begin with mpz_cdiv (c is + short for ceil). + + The old division routines beginning with mpz_m are similar to the new + mpz_fdiv, with the exception that some of the new functions return useful + values. + + The old function names can still be used. All the old functions names will + now do floor division, not trunc division as some of them used to. This was + changed to make the functions more compatible with common mathematical + practice. + + The mpz_mod and mpz_mod_ui functions now compute the mathematical mod + function. I.e., the sign of the 2nd argument is ignored. + +* The mpq assignment functions do not canonicalize their results. A new + function, mpq_canonicalize must be called by the user if the result is not + known to be canonical. +* The mpn functions are now documented. These functions are intended for + very time critical applications, or applications that need full control over + memory allocation. Note that the mpn interface is irregular and hard to + use. +* New functions for arbitrary precision floating point arithmetic. Names + begin with `mpf_'. Associated type mpf_t. +* New and improved mpz functions, including much faster GCD, fast exact + division (mpz_divexact), bit scan (mpz_scan0 and mpz_scan1), and number + theoretical functions like Jacobi (mpz_jacobi) and multiplicative inverse + (mpz_invert). +* New variable types (mpz_t and mpq_t) are available that makes syntax of + mpz and mpq calls nicer (no need for & before variables). The MP_INT and + MP_RAT types are still available for compatibility. +* Uses GNU configure. This makes it possible to choose target architecture + and CPU variant, and to compile into a separate object directory. +* Carefully optimized assembly for important inner loops. Support for DEC + Alpha, Amd 29000, HPPA 1.0 and 1.1, Intel pentium and generic x86, Intel + i960, Motorola MC68000, MC68020, MC88100, and MC88110, Motorola/IBM + PowerPC, National NS32000, IBM POWER, MIPS R3000, R4000, SPARCv7, + SuperSPARC, generic SPARCv8, and DEC VAX. Some support also for ARM, + Clipper, IBM ROMP (RT), and Pyramid AP/XP. +* Faster. Thanks to the assembler code, new algorithms, and general tuning. + In particular, the speed on machines without GCC is improved. +* Support for machines without alloca. +* Now under the LGPL. + +INCOMPATIBILITIES BETWEEN GMP 1 AND GMP 2 + +* mpq assignment functions do not canonicalize their results. +* mpz division functions round differently. +* mpz mod functions now really compute mod. +* mpz_powm and mpz_powm_ui now really use mod for reduction. |