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Date: Tue, 27 Sep 2011 09:48:43 +0200
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: 64 bit codes
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Date: 2011-09-27T09:48:43+02:00
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On 27.09.11 08:59, Mok-Kong Shen wrote:
> The included gcc does not accept the -m64 option.

Which one of the GNAT distributions for Windows(TM) do you have?

X:\> gcc -v
X:\> gnatls -v

are ways to learn about the compiler.

> Does this imply that
> the ADA codes generated do not make full use of the 64 bit hardware?

Does your GNAT accept

    type T is range 0 .. 2**40?

and does the generated code show use of the RAX registers
etc?

Side note: if GCC still does not permit switching the physical
size of pointers, then programs that use lots of pointers (in
the generated code, not necessarily in the Ada source text) might
be less efficient and waste CPU cache if all pointers are
64bit in size.

> (My PC runs Windows 7, 64 bit version.) Thanks.
>
> M. K. Shen