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[RFC PATCH] .bundle_align_mode

nick clifton nickc@redhat.com
Wed Feb 15 10:20:00 GMT 2012 
Hi Roland,

   A few thoughts on this feature:

* It might be useful to mention in the documentation why this feature is 
needed.

>  When aligned instruction
> +bundle mode is in effect, no single instruction may span a boundary between
> +bundles.  If an instruction would start too close to the end of a bundle for
> +the length of that particular instruction to fit within the bundle, then the
> +space at the end of that bundle is filled with no-op instructions so the
> +instruction starts in the next bundle.

* What about instructions with delay slots ?

* Would it be considered an error, or just unusual, if the 
.bundle_align_mode directive was used inside a non-executable section ?


> +@section @code{.bundle_lock} and @code{.bundle_unlock}

* Can these directives be nested ?


* Presumably once a bundle has been created by the assembler, it needs 
to be preserved by the linker.  Thus it seems to me that you are going 
to need a reloc or two to tell the linker about the bundle.


Cheers
   Nick
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