https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98384
--- Comment #24 from Patrick Palka <ppalka at gcc dot gnu.org> ---
(In reply to David Edelsohn from comment #23)
> The AIX failure is:
>
> printf_buffer=
> 1.
> 44269504088896338700465094007086008800000000000000000000000000000000000000000
> 00000000000000000000000
>
> to_chars_buffer=
> 1.
> 44269504088896338700465094007086008787155151367187500000000000000000000000000
> 00000000000000000000000??/?P00001.
> 44269504088896338700465094007086008800000000000000000000000000000000000000000
> 00000000000000000000000
>
> output_length=
> 102
>
> ./long_double.cc:194: void test02(): Assertion '!memcmp(printf_buffer,
> to_chars_buffer, output_length)' failed.
I managed to reproduce this issue on AIX (gcc119). It looks like the %e/%f/%g
specifiers (as well as %Le/%Lf/%Lg -- long double is equivalent to double)
never output more than 37 significant decimal digits on AIX.
For e.g.
printf("%.53e\n", 0x1.71547652b82fep+0);
printf("%.0f\n", 0x1.249ad2594c37dp+332);
x86 glibc printf outputs
1.44269504088896338700465094007086008787155151367187500e+00
10000000000000000159028911097599180468360808563945281389781327557747838772170381060813469985856815104
and AIX printf outputs
1.44269504088896338700465094007086008800000000000000000e+00
10000000000000000159028911097599180470000000000000000000000000000000000000000000000000000000000000000
It seems to me the output of AIX printf is wrong/nonconforming here..
