Re: 64 bit codes

[Mok-Kong Shen <mok-kong.shen@t-online.de>]

Am 27.09.2011 09:48, schrieb Georg Bauhaus:

> 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.

gcc -v gives among others:

COLLECT_LTO_WRAPPER=c:/gant/2011/bin/../libexec/gcc/i686-pc-mingw32/4.5.3/lto-wrapper.exe
Target: i686-pc-mingw32
Configured with:  (lots of stuff, among them:)
     --build=i686-pc-mingw32  -enable-threads=win32
Thread model: win32
gcc version 4.5.3 20110428 for GNAT GPL 2011 <20110428> <GCC>

gnatls -v gives 2 paths:

C:/GNAT/2011/lib/gcc/i686-pc-mingw32/4.5.3/adainclude/

C:/GNAT/2011/lib/gcc/i686-pc-mingw32/4.5.3/adalib/

> Does your GNAT accept
>
> type T is range 0 .. 2**40?

yes (no complaint on compilation).

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

I am not familiar with how to examine the generated code. I should
be grateful, if you could further help me with the information above
in obtaining the answer to my question.

M. K. Shen



> 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.