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Mail Archives: djgpp/2001/02/28/08:36:30

From: Michiel de Bondt <michielb AT sci DOT kun DOT nl>
Newsgroups: comp.os.msdos.djgpp
Subject: bug
Date: Wed, 28 Feb 2001 14:20:35 +0100
Organization: University of Nijmegen
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Hello djgpp-ers,

I think I found a bug in gcc. But first, I had to mail the bug to this
newsgroup. gcc allocates an occupied register for a computation. I made
the following small sample file of the problem. You should cancel
optimization, otherwise the problem does not occur due to removal of
code.

Best regard, Michiel de Bondt




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Content-Type: text/plain; charset=us-ascii;
 name="regs.cpp"
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 filename="regs.cpp"

// do not use optimization

union intel
{
  long e;
  short x;
  struct {
    char l;
    char h;
  } b;
};

int main ()
{
  register union intel a __asm__ ("%eax");
  register union intel b __asm__ ("%ebx");
  register union intel c __asm__ ("%ecx");
  register union intel d __asm__ ("%edx");
  b.b.l++;
}

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