Path: utzoo!telly!attcan!uunet!tut.cis.ohio-state.edu!MOOSE.CITA.UTORONTO.CA!trq
From: trq@MOOSE.CITA.UTORONTO.CA (Tom Quinn)
Newsgroups: gnu.gcc.bug
Subject: bug in m68k gcc 1.33
Message-ID: <8902042226.AA03087@moose.cita.utoronto.ca>
Date: 4 Feb 89 22:26:15 GMT
Sender: daemon@tut.cis.ohio-state.edu
Distribution: gnu
Organization: GNUs Not Usenet
Lines: 87

The following code will cause gcc to abort when compiled with the "-g
-O" option.  This is gcc version 1.33 on a Sun 3/50 running SunOS 3.5.

Tom Quinn                 Canadian Institute for Theoretical Astrophysics
trq@moose.cita.utoronto.ca
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The compile:
gcc -g -v -O -c qmove.c
gcc version 1.33
 /usr/local/lib/gcc-cpp -v -undef -D__GNUC__ -Dmc68000 -Dsun -Dunix -D__mc68000__ -D__sun__ -D__unix__ -D__OPTIMIZE__ -D__HAVE_68881__ -Dmc68020 qmove.c /tmp/cca13863.cpp
GNU CPP version 1.33
 /usr/local/lib/gcc-cc1 /tmp/cca13863.cpp -quiet -dumpbase qmove.c -g -O -version -o /tmp/cca13863.s
GNU C version 1.33 (68k, MIT syntax) compiled by GNU C version 1.33.
gcc: Program cc1 got fatal signal 6.

The code:
------------------------------------------------------------------------
int
    pen_x, pen_y,	 
    level,		 
    Speed;		 
bounds(x0, y0, x1, y1, dx0, dy0, dx1, dy1)
register int x0, y0, x1, y1;
register int *dx0, *dy0, *dx1, *dy1;
{
    register int new_x0, new_y0, new_x1, new_y1;
    int count, loop_count = 0;
    if (!(	random () % 10)) {
	register int r;
	r = 	random ();
	*dx0 = (1 + r%(Speed-1)) * ((r&1) ? -1 : 1);
	r = 	random ();
	*dy0 = (1 + r%(Speed-1)) * ((r&1) ? -1 : 1);
	r = 	random ();
	*dx1 = (1 + r%(Speed-1)) * ((r&1) ? -1 : 1);
	r = 	random ();
	*dy1 = (1 + r%(Speed-1)) * ((r&1) ? -1 : 1);
	if (level > -2 && !(	random () % (6 - level))) {
	    if (pen_x - x0 > 0 && *dx0 < 0)
		*dx0 = -*dx0;
	    if (pen_x - x1 > 0 && *dx1 < 0)
		*dx1 = -*dx1;
	    if (pen_y - y0 > 0 && *dy0 < 0)
		*dy0 = -*dy0;
	    if (pen_y - y1 > 0 && *dy1 < 0)
		*dy1 = -*dy1;
	}
    }
    do  {
	if (x0 + *dx0 <= 1 || x0 + *dx0 >= ((	700  - 2 * 			10 )/		5 ) -2)
	    *dx0 = -*dx0;
	if (x1 + *dx1 <= 1 || x1 + *dx1 >= ((	700  - 2 * 			10 )/		5 ) -2)
	    *dx1 = -*dx1;
	if (y0 + *dy0 <= 1 || y0 + *dy0 >= ((	750 -			10 -		25 )/		5 ) -2)
	    *dy0 = -*dy0;
	if (y1 + *dy1 <= 1 || y1 + *dy1 >= ((	750 -			10 -		25 )/		5 ) -2)
	    *dy1 = -*dy1;
	new_x0 = x0 + *dx0;
	new_x1 = x1 + *dx1;
	new_y0 = y0 + *dy0;
	new_y1 = y1 + *dy1;
	if ((abs(new_x1 - new_x0) >  45	) || (abs((*dx0)-(*dx1)) <  ((4+level)/3)	))
	    if (	random ()&1)
		*dx1 += (x1<x0 ?  (Speed)  : - (Speed) ), new_x1 = x1 + *dx1;
	    else
		*dx0 += (x0<x1 ?  (Speed)  : - (Speed) ), new_x0 = x0 + *dx0;
	if ((abs(new_y1 - new_y0) >  45	) || (abs((*dy0)-(*dy1)) <  ((4+level)/3)	)) 
	    if (	random ()&1)
		(*dy1) += (y1<y0 ?  (Speed)  : - (Speed) ), new_y1 = y1 + *dy1;
	    else
		(*dy0) += (y0<y1 ?  (Speed)  : - (Speed) ), new_y0 = y0 + *dy0;
	if ((count = check_line(new_x0, new_y0, new_x1, new_y1)) == 1) {
	    register int r;
	    *dx0 = (1 + (r = 	random ())%Speed) * ((r&1) ? -1 : 1);
	    *dy0 = (1 + (r = 	random ())%Speed) * ((r&1) ? -1 : 1);
	    *dx1 = (1 + (r = 	random ())%Speed) * ((r&1) ? -1 : 1);
	    *dy1 = (1 + (r = 	random ())%Speed) * ((r&1) ? -1 : 1);
	}
	if (!(++loop_count % 100)) {
	    break;
	}
    } while(count == 1);
    return count;
}