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1999-10-25 Thorsten Kukuk <kukuk@suse.de> * md5-crypt/md5.h: Remove prototypes for public interface. md5 is used only internal. * md5-crypt/md5-crypt.c: Use internal names for md5 functions, remove weak alias for public names. * md5-crypt/md5.c: Remove weak aliase. 1999-10-25 Andreas Jaeger <aj@suse.de> * math/README.libm-test: New file, documents libm-test.inc. 1999-10-25 Andreas Jaeger <aj@suse.de> * math/gen-libm-test.pl: Only generate a new ulps file when -n is given. (print_ulps_file): Fix loops to not read @tests and @functions since those are not initialized with -n now. (parse_ulps): Set $results{..}{"kind"}.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| README for libm-test math test suite | ||
| ==================================== | ||
|
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| The libm-test math test suite tests a number of function points of | ||
| math functions in the GNU C library. The following sections contain a | ||
| brief overview. Please note that the test drivers and the Perl script | ||
| "gen-libm-test.pl" have some options. A full list of options is | ||
| available with --help (for the test drivers) and -h for | ||
| "gen-libm-test.pl". | ||
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| What is tested? | ||
| =============== | ||
| The tests just evaluate the functions at specified points and compare | ||
| the results with precomputed values and the requirements of the ISO | ||
| C99 standard. | ||
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| Besides testing the special values mandated by IEEE 754 (infinities, | ||
| NaNs and minus zero), some more or less random values are tested. | ||
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| Files that are part of libm-test | ||
| ================================ | ||
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| The main file is "libm-test.inc". It is platform and floating point | ||
| format independent. The file must be preprocessed by the Perl script | ||
| "gen-libm-test.pl". The results are "libm-test.c" and a file | ||
| "libm-test-ulps.h" with platform specific deltas. | ||
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| The test drivers test-double.c, test-float.c, test-ldouble.c test the | ||
| normal double, float and long double implementation of libm. The test | ||
| drivers with an i in it (test-idouble.c, test-ifloat.c, | ||
| test-ildoubl.c) test the corresponding inline functions (where | ||
| available - otherwise they also test the real functions in libm). | ||
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| "gen-libm-test.pl" needs a platform specific files with ULPs (Units of | ||
| Last Precision). The file is called "libm-test-ulps" and lives in | ||
| platform specific sysdep directory. | ||
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| How can I generate "libm-test-ulps"? | ||
| ==================================== | ||
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| The test drivers have an option "-u" to output an unsorted list of all | ||
| epsilons that the functions have. The output can be read in directly | ||
| but it's better to pretty print it first. "gen-libm-test.pl" has an option | ||
| to generate a pretty-printed and sorted new ULPs file from the output | ||
| of the test drivers. | ||
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| To generate a new "libm-test-ulps" file, you can execute for example: | ||
| test-double -u --ignore-max-ulp=yes | ||
| This generates a file "ULPs" with all double ULPs in it, ignoring any | ||
| previous calculated ULPs. | ||
| Now move this away, e.g. "mv ULPs allULPs" and generate the ULPs | ||
| for all other formats and concat all ULP files together (e.g. "cat | ||
| ULPs >> allULPs"). As final step run "gen-libm-test.pl" with the file | ||
| as input and ask to generate a pretty printed output in the file "NewUlps": | ||
| gen-libm-test.pl -u allULPs -n | ||
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| Now you can rename "NewUlps" to "libm-test-ulps" and move it into | ||
| sysdeps. | ||
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| Contents of libm-test-ulps | ||
| ========================== | ||
| Since libm-test-ulps can be generated automatically, just a few | ||
| notes. The file contains lines for single tests, like: | ||
| Test "cos (pi/2) == 0": | ||
| float: 1 | ||
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| and lines for maximal errors of single functions, like: | ||
| Function "yn": | ||
| idouble: 6.0000 | ||
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| The keywords are float, ifloat, double, idouble, ldouble and ildouble | ||
| (the prefix i stands for inline). You can also specify known | ||
| failures, e.g.: | ||
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| Test "cos (pi/2) == 0": | ||
| float: 1 | ||
| float: fail | ||
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| Adding tests to libm-test.inc | ||
| ============================= | ||
|
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| The tests are evaluated by a set of special test macros. The macros | ||
| start with "TEST_" followed by a specification the input values, an | ||
| underscore and a specification of the output values. As an example, | ||
| the test macro for a function with input of type FLOAT (FLOAT is | ||
| either float, double, long double) and output of type FLOAT is | ||
| "TEST_f_f". The macro's parameter are the name of the function, the | ||
| input parameter, output parameter and optionally one exception | ||
| parameter. | ||
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| The accepted parameter types are: | ||
| - "f" for FLOAT | ||
| - "b" for boolean - just tests if the output parameter evaluates to 0 | ||
| or 1 (only for output). | ||
| - "c" for complex. This parameter needs two values, first the real, | ||
| then the imaginary part. | ||
| - "i" for int. | ||
| - "l" for long int. | ||
| - "L" for long long int. | ||
| - "F" for the address of a FLOAT (only as input parameter) | ||
| - "I" for the address of an int (only as input parameter) | ||
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| Some functions need special handling. For example gamma sets the | ||
| global variable signgam and frexp takes an argument to &int. This | ||
| special treatment is coded in "gen-libm-test.pl" and used while | ||
| parsing "libm-test.inc". |
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