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author | Jarkko Hietaniemi <jhi@iki.fi> | 2017-05-29 09:28:30 +0300 |
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committer | Jarkko Hietaniemi <jhi@iki.fi> | 2017-05-30 09:43:40 +0300 |
commit | e77299d3416e7e737523afdc0642734205e46d59 (patch) | |
tree | e28e4d55ea3240890381cf78ba837a5007ce7af6 | |
parent | 390ae6f9aa25246d462b235923fe012cf40d157a (diff) | |
download | perl-e77299d3416e7e737523afdc0642734205e46d59.tar.gz |
Fallbacks for Perl_fp_class_denorm().
These may be needed if the compiler doesn't expose the C99 math
without some special switches.
-rw-r--r-- | perl.h | 20 |
1 files changed, 20 insertions, 0 deletions
@@ -6867,6 +6867,26 @@ extern void moncontrol(int); # endif #endif +/* We have somehow managed not to define the denormal/subnormal + * detection. + * + * This may happen if the compiler doesn't expose the C99 math like + * the fpclassify() without some special switches. Perl tries to + * stay C89, so for example -std=c99 is not an option. + * + * The Perl_isinf() and Perl_isnan() should have been defined even if + * the C99 isinf() and isnan() are unavailable, and the NV_MIN becomes + * from the C89 DBL_MIN or moral equivalent. */ +#if !defined(Perl_fp_class_denorm) && defined(Perl_isinf) && defined(Perl_isnan) && defined(NV_MIN) +# define Perl_fp_class_denorm(x) ((x) != 0.0 && !Perl_isinf(x) && !Perl_isnan(x) && PERL_ABS(x) < NV_MIN) +#endif + +/* This is not a great fallback: subnormals tests will fail, + * but at least Perl will link and 99.999% of tests will work. */ +#if !defined(Perl_fp_class_denorm) +# define Perl_fp_class_denorm(x) FALSE +#endif + #ifdef DOUBLE_IS_IEEE_FORMAT # define DOUBLE_HAS_INF # define DOUBLE_HAS_NAN |