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| -rw-r--r-- | src/mpfr-impl.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/mpfr-impl.h b/src/mpfr-impl.h index 9dbf955f1..d88ead747 100644 --- a/src/mpfr-impl.h +++ b/src/mpfr-impl.h @@ -2687,6 +2687,16 @@ extern "C" { (see changeset r13820 in the ubf2 branch). So, for the time being, as long as the code does not break, do not change anything. + Note: The condition "use mpfr_ptr to access the usual mpfr_t members and + mpfr_ubf_ptr to access the additional member _mpfr_zexp" may be ignored + if the union type is visible within the function (see ISO C99 6.5.2.3#5 + and 6.5.2.3#8 for the example, this implementation being very similar to + the valid fragment of this example), which must be the case as the union + is declared globally. However, this seems to be buggy in GCC: + + https://gcc.gnu.org/bugzilla/show_bug.cgi?id=14319 + https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65892 + Alternatively, GCC's may_alias attribute could conditionally be used on the __mpfr_ubf_struct and __mpfr_struct types (though it would be much stronger than needed since only these two types may alias each |