[egcs-19980608] Extremely serious comparison bug

[Hyman Rosen <hymie at prolifics dot com>]

The following code runs incorrectly and prints "FAILED!" when compiled
with -O, -O1, or -O2 on x86 Linux. The reason is this sequence of
instructions for the comparison:

	movb (%ebx),%al
	andb $111,%al
	cmpl $2,%eax		<---- This is wrong

/*----------------------------------------------------------------------------*/
struct fd
{
	unsigned char a;
	unsigned char b;
} f = { 5 };

struct fd *g() { return &f; }
int h() { return -1; }

int main(int c, char **v)
{
	extern int printf(char *, ...);
	struct fd *f = g();
	f->b = h();
	if (((f->a & 0x7f) & ~0x10) <= 2)
		printf("FAILED!\n");
	return 0;
}
/*----------------------------------------------------------------------------*/