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Re: RFC: 40 bit integer support


On Sat, Jul 2, 2011 at 12:11 AM, Joseph S. Myers
<joseph@codesourcery.com> wrote:
> On Fri, 1 Jul 2011, Bernd Schmidt wrote:
>
>> > * The global tree nodes for various modes are suspicious. ?Why are they
>> > needed at all?
>>
>> Do you mean only the PImode ones or also intQI_type_node etc.? These are
>> used to pick a suitable type in c_common_type_for_size.
>
> All of them.

Btw, I agree.  The type_for_size langhook shouldn't be used from the middle-end,
so the langhook should be restricted to handle those types the frontends use
the langhook for (which means, the language specific types available).

The middle-end uses of type-for-size should be all changed to
build_nonstandard_integer_type.

I think that in the end all global (middle-end visible) tree types
should be those
of the targets respective C ABI, thus those types necessary for example to
create the various builtins for the C library functions.

Thus, I don't understand why we have all those mode-specific global tree
type nodes.  In fact, most of them are not used at all.

Richard.


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