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79 lines
2.7 KiB
Plaintext
79 lines
2.7 KiB
Plaintext
How to compile GNU MPFR with mini-gmp
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=====================================
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To build and test MPFR against mini-gmp:
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./configure --with-mini-gmp=DIR [other configure options]
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make
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make check
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where DIR is the directory that contains mini-gmp
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(for example .../gmp-6.2.0/mini-gmp).
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"make" will build mini-gmp with the same compiler as for MPFR.
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For "make check", tests that use features not supported by mini-gmp
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(mpq_t, mpf_t, and the gmp_*printf functions) are skipped.
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Note: To use this version of the MPFR library, you need to define
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the MPFR_USE_MINI_GMP macro before including mpfr.h (alternatively,
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you can modify mpfr.h to define this macro at the beginning, though
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this is discouraged). And since mini-gmp currently does not provide
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random functions, you also need to define the gmp_randstate_t type
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with
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typedef long int gmp_randstate_t[1];
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before including mpfr.h (or you may want to modify mini-gmp.h).
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Remark: The random functions provided by MPFR configured with mini-gmp
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use the standard rand() function, thus one should avoid mini-gmp if one
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needs some really serious random functions. Another consequence is that
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these functions may not be thread-safe.
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The build with mini-gmp may require ISO C99+ features, such as "long long".
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This was tested with revision 39ac9e4 and GMP 6.2.0 on x86_64 GNU/Linux:
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============================================================================
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Testsuite summary for MPFR 4.1.0-dev
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============================================================================
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# TOTAL: 183
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# PASS: 172
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# SKIP: 11
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# XFAIL: 0
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# FAIL: 0
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# XPASS: 0
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# ERROR: 0
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============================================================================
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How to use mini-gmp with reduced limb size
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==========================================
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Following the idea of Micro-GMP [1], the GMP developers have adapted mini-gmp
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so that it can be used with a reduced limb size. For that, you need GMP 6.2.0
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(or later) and define the MINI_GMP_LIMB_TYPE macro with the associated base
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type, e.g.
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-DMINI_GMP_LIMB_TYPE=char (in practice, 8 bits)
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-DMINI_GMP_LIMB_TYPE=short (in practice, 16 bits)
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-DMINI_GMP_LIMB_TYPE=int (in practice, 32 bits)
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For example:
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./configure --with-mini-gmp=DIR CFLAGS="-DMINI_GMP_LIMB_TYPE=int"
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This was tested with revision 39ac9e4 and GMP 6.2.0 on x86_64 GNU/Linux:
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============================================================================
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Testsuite summary for MPFR 4.1.0-dev
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============================================================================
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# TOTAL: 183
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# PASS: 172
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# SKIP: 11
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# XFAIL: 0
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# FAIL: 0
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# XPASS: 0
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# ERROR: 0
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============================================================================
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[1] https://members.loria.fr/PZimmermann/talks/microgmp.pdf
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