On Fri, 26 Aug 2016, Florian Weimer wrote: > The crucial question is whether GCC will start assuming that pointers returned > by malloc (or attribute-malloc functions) have such an alignment. That seems > impossible.
GCC's assumptions about the alignment of pointers returned by malloc are more conservative (MALLOC_ABI_ALIGNMENT, default BITS_PER_WORD) - those assumptions need to allow for malloc replacements as well as that in standard libc. Of course any user code using malloc to allocate storage containing __float128 or _Decimal128 is implicitly requiring it to be sufficiently aligned (GCC will generate SSE loads / stores for such objects that require 16-byte alignment). But most code avoids that issue just as most code wasn't hit by the powerpc problems (despite GCC being able to generate AltiVec loads / stores for long double on powerpc32). -- Joseph S. Myers jos...@codesourcery.com
