This is probably an egcs 2.91.66 introduced compiler optimization bug,

[wtenhave@sybase.com]

On  6 Jan, Horst von Brand wrote:
> wtenhave@sybase.com said:
> 
> [...]
> 
>> #define CHK_A	(long)0x40000000
>> #define	CHK_B	(long)0x80000000
>> 
>> main ()
>> {
>> 	long	rdata = CHK_B;
>> 
>> 	if ((rdata & CHK_A) ||
>> 		!(rdata & CHK_B))
>> 	{
>> 		printf ("BAD NEWS\n");
>> 	} else
>> 	{
>> 		printf ("GOOD NEWS\n");
>> 	}
>> }
> 
> The reported bug is present on sparc-linux (Red Hat 6.1, egcs-1.1.2-24)
> too; egcs-20000103 doesn't have it. Also, on SPARC Solaris 2.6 gcc-2.95.2
> doesn't show the problem, so it apperas fixed.

   As does alpha-linux (Red Hat 6.1, egcs-1.1.2-24).  You have to change the
   declarations to 'int' or define CHK_B for 0x8000000000000000 here of course.

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