Re: Unaligned memory access

> However, I have alignment issues in the userdata from time to time. It
> happens when the userdata contains something that requires a 16 byte
> alignment. Since this is not enforced by lua_newuserdata, the program will
> crash with things like this:
> 
>    0x00007ff6fe911135 <+85>:    xorps  %xmm6,%xmm6
> => 0x00007ff6fe911138 <+88>:    movaps %xmm6,0x50(%rdi)
> 
> where %rdi is not 16-bytes aligned.

Lua ensures that the memory in a userdata is aligned with values
in ISO C. If you have other objects that require other alignments
(such as 16-bit values), you can redefine the macro LUAI_MAXALIGN, in
luaconf.h. Its standard definition is like this:

  #define LUAI_MAXALIGN  lua_Number n; double u; void *s; lua_Integer i; long l

Just toss these other objects in this list.

-- Roberto

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