From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ulrich Drepper <drepper@cygnus.com>
To: egcs@cygnus.com
Subject: internal error asm
Date: Mon, 23 Feb 1998 15:08:00 -0000
Message-id: <r2iuq6ggb9.fsf@happy.cygnus.com>
X-SW-Source: 1998-02/msg01084.html

Hi,

the following little piece of code crashed all gcc versions on ix86
which I could test:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#include <stdio.h>

extern double bar (double);

int
baz (double d)
{
  double e = bar (d);
#ifdef BROKEN
  asm volatile ("" : : : "st");
#else
  asm volatile ("" : : : "memory");
#endif
  return printf ("%lg\n", e);
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

drepper@happy drepper$ gcc -Wa,-al -c v.c -O3 -DBROKEN
gcc: Internal compiler error: program cc1 got fatal signal 11

Not defining BROKEN lets the compiler finish but the result is not the
same (I want to force `e' being written to memory before calling
printf).  It's necessary to compile libm correctly.

-- Uli
---------------.      drepper at gnu.org  ,-.   1325 Chesapeake Terrace
Ulrich Drepper  \    ,-------------------'   \  Sunnyvale, CA 94089 USA
Cygnus Solutions `--' drepper at cygnus.com   `------------------------