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From: "Stefano M." <stefano.m@nospam.tin.it>
Newsgroups: comp.lang.ada
Subject: Re: Gnat's Ada.Float_Text_IO.Put problem
Date: Thu, 15 Jan 2004 12:02:57 +0100
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Xref: archiver1.google.com comp.lang.ada:4431
Date: 2004-01-15T12:02:57+01:00
List-Id: <comp.lang.ada>

Georg Bauhaus wrote:

> 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$ 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?

I suddenly recalled there was a -S switch somewhere, here's what I get:

ste@sim:~/prove$ cat main.adb
procedure Main is
     Sample_Float : Float := 10.123;
begin
    null;
end Main;
ste@sim:~/prove$ gcc -c -S -fomit-frame-pointer -gnatp main.adb
ste@sim:~/prove$ cat main.s
      .verstamp 3 11
      .set noreorder
      .set volatile
      .set noat
      .arch ev4
      .file 1 "main.adb"
      .rdata
      .align 2
$LC0:
      .long 1092745167
      .text
      .align 2
      .globl _ada_main
      .ent _ada_main
_ada_main:
      .frame $30,16,$26,0
      ldgp $29,0($27)
$_ada_main..ng:
      lda $30,-16($30)
      .prologue 1
      lda $1,$LC0
      lds $f10,0($1)
      sts $f10,0($30)
      lda $30,16($30)
      ret $31,($26),1
      .end _ada_main

Anything interesting for you?

Stefano