Re: __hldtoa broken for ld128

[christos%astron.com@localhost (Christos Zoulas)]

In article <CAJgzZooiOvFBa3ZO19wOy+T7P8r_iqJgrBgPFvvtUgDTU0Bspg%mail.gmail.com@localhost>,
enh  <enh%google.com@localhost> wrote:
>this was found by fuzzing the LLVM __cxa_demangle on an ld128 Android
>system using hwasan, but it turns out no to simply be a buffer
>overflow --- the results are just wrong. (which shows how much anyone
>uses ld128 in conjunction with %a!)

Thanks a lot for the heads up. NetBSD uses 2x64 bit words instead
of 4x32 bit words to represent long double so we avoided this bug
by chance (we don't have EXT_FRAC{H,L}MBITS. Nevertheless I will
commit something like it for completeness.

https://nxr.netbsd.org/xref/src/sys/sys/ieee754.h#126

Best,

christos