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From: Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de>
Newsgroups: comp.lang.ada
Subject: Re: Gnat's Ada.Float_Text_IO.Put problem
Date: Thu, 15 Jan 2004 01:55:26 +0000 (UTC)
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Stefano M. <stefano.m@nospam.tin.it> wrote:
: ste@sim:~/prove$ ./main
: Standard 'put' behaviour from Ada.Float_Text_IO: 10,123 = -0.00000E+00
: 
: As you can see the problem is still there.
: I found this thread on one of the ACT mailing lists which shed some 
: light on the matter:
: http://www.act-europe.fr/mail/chat/2000-07/threads.html#00038
: Seems like I'm not the only one experiencing this kind of problem.

Maybe there are two questions to answer:
Is there a way to switch floating point modes of your hardware?
What do you get for the sample_float value in your object code?
The second question can be answered with a simpler program:

sonnenregen:/tmp$ cat main.adb
procedure Main is
    Sample_Float : Float := 10.123;
begin
   null;
end Main;

sonnenregen:/tmp$ gcc -c -gnatp -v main.adb
Reading specs from /opt/GCC/34/lib/gcc/i686-pc-linux-gnu/3.4/specs
...


sonnenregen:/tmp$ objdump --disassemble main.o

main.o:     file format elf32-i386

Disassembly of section .text:

00000000 <_ada_main>:
   0:   55                      push   %ebp
   1:   89 e5                   mov    %esp,%ebp
   3:   83 ec 04                sub    $0x4,%esp
   6:   b8 cf f7 21 41          mov    $0x4121f7cf,%eax         <<----
   b:   89 45 fc                mov    %eax,0xfffffffc(%ebp)
   e:   c9                      leave  
   f:   c3                      ret    

What do you get at <<----? Does it change when you add a few tenths?


-- Georg