https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77330
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- I think this is a malloc bug: x86 malloc should produce 16-byte-aligned results because the relevant TR / TS documents define _Decimal128 and _Float128 in such a way that they are types for which malloc should return suitably aligned memory. I also think GCC should, correspondingly, make max_align_t have 16-byte alignment on 32-bit x86, notwithstanding that this is a minor ABI change.