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Re: IA64 bootstrap problem for Ada
- From: "Zack Weinberg" <zack at codesourcery dot com>
- To: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
- Cc: gcc at gcc dot gnu dot org
- Date: Thu, 30 Oct 2003 14:39:24 -0800
- Subject: Re: IA64 bootstrap problem for Ada
- References: <10310302219.AA03657@vlsi1.ultra.nyu.edu>
email@example.com (Richard Kenner) writes:
> > In Ada, the sizes of primitive types are static and hence known by the
> > front end. They get them from the _TYPE_SIZE values.
> That's what needs to change. Lay out the types first, then extract
> the numbers from the TYPE_SIZE fields.
> You can't. You need to know the sizes *before* you layout anything. As
> I said, it's "static". That's the whole point.
I don't understand why static from the point of view of the program
being compiled translates to "has to be known before you layout anything."
> I'm not sure I understand what is meant by "when given a size value
> for an FP type." Does Ada allow the programmer to specify the desired
> storage size of a floating point type, as a number of bits?
> Yes. The programmer can specify the number of digits and the size in bits.
> Indeed that's the *only* way to specify the desired FP type.
I suppose number of digits could be used to disambiguate, but as I
said in my earlier message, size-in-bits is intrinsically ambiguous