Re: please, help me with libffi on iOS porting

[cowwoc <cowwoc at bbs dot darktech dot org>]

Hi Andrew,


Andrew Haley wrote:
> 
>> to have 4 bytes alignment.  So is there a reason the alignment is
>> set to 1 byte?
> 
> The doc says:
> 
> `.align EXPRESSION [, EXPRESSION]'
>      This is the generic .ALIGN directive.  For the ARM however if the
>      first argument is zero (ie no alignment is needed) the assembler
>      will behave as if the argument had been 2 (ie pad to the next four
>      byte boundary).  This is for compatibility with ARM's own
>      assembler.
> 

I believe you are wrong on this point. GNU Assembler says this:
http://sourceware.org/binutils/docs/as/ARM-Directives.html

but Apple Assembler does not:
https://developer.apple.com/library/mac/#documentation/developertools/Reference/Assembler/040-Assembler_Directives/asm_directives.html

hence the generated memory alignment is wrong.

Gili
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