[ruby-core:101199] [Ruby master Feature#17356] Alignment of memory allocated through Fiddle struct's malloc

Issue #17356 has been updated by AndreaRibuoli (Andrea Ribuoli).


FYI. 
I was informed by IBM that IBM i PASE *malloc* always returns 16-bite aligned memory! 
This differs from AIX (that is not my target). 
So my patch seems to be 
* redundant for my environment and 
* unsafe in other platforms. 

Nonetheless addressing this topic in general could be useful elsewhere. 
I have also found [this answer](https://stackoverflow.com/questions/9078259/does-realloc-keep-the-memory-alignment-of-posix-memalign) very clear. 

Thanks for caring, Andrea 

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Feature #17356: Alignment of memory allocated through Fiddle struct's malloc
https://bugs.ruby-lang.org/issues/17356#change-88882

* Author: AndreaRibuoli (Andrea Ribuoli)
* Status: Open
* Priority: Normal
----------------------------------------
I am testing a low-level patch for **Ruby 3** that inside *gc.c* replaces:

  `TRY_WITH_GC(size, mem = malloc(size));`

with:

  `TRY_WITH_GC(size, mem = aligned_alloc(16,size));`

This should allow me to control that Fiddle returns pointers quad-words aligned.

Is it possible to introduce a configure parameter to control this kind of setting?

Refer to [issue opened on Fiddle](https://github.com/ruby/fiddle/issues/53).

Kind regards,

   Andrea Ribuoli



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