[Bug malloc/6527] [powerpc] Malloc alignment insufficient for PowerPC

["joseph at codesourcery dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=6527

--- Comment #6 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I don't think malloc should try to provide alignment for vector types, 
only C standard types and types from C standard extensions defined in a 
way that makes them types for which malloc should provide alignment; other 
functions such as aligned_alloc should be used when bigger alignment is 
required.  That leaves powerpc (long double) and 32-bit x86 (_Decimal128, 
__float128 / future standard _Float128) as the only affected cases, I 
think.

The most recently discussed suggestion for dealing with malloc_get_state / 
malloc_set_state is that malloc_set_state should mark all previous 
allocations as unfreeable (so attempts to free a previous allocation are 
no-ops), limiting the amount malloc needs to do with the state generated 
by malloc with different alignment.

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