Path: utzoo!telly!ddsw1!mcdchg!rutgers!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 sparc gcc 1.32
Message-ID: <8901062220.AA07053@moose.cita.utoronto.ca>
Date: 6 Jan 89 22:20:35 GMT
Sender: daemon@tut.cis.ohio-state.edu
Distribution: gnu
Organization: GNUs Not Usenet
Lines: 137

The following code causes gcc to abort.  This is gcc version 1.32 on a
Sun 4/110 running SunOS 4.0.

Tom Quinn                 Canadian Institute for Theoretical Astrophysics
trq@moose.cita.utoronto.ca
UUCP   - decvax!utgpu!moose!trq
BITNET - quinn@utorphys.bitnet
ARPA   - trq%moose.cita.toronto.edu@relay.cs.net

The compile:
gcc -g -v -O  -sun4 -c  miarc.c
gcc version 1.32
 /usr/local/lib/gcc-cpp -v -undef -D__GNUC__ -Dsparc -Dsun -Dunix -D__sparc__ -D__sun__ -D__unix__ -D__OPTIMIZE__ miarc.c /tmp/cca03569.cpp
GNU CPP version 1.32
 /usr/local/lib/gcc-cc1 /tmp/cca03569.cpp -quiet -dumpbase miarc.c -g -O -version -o /tmp/cca03569.s
GNU C version 1.32 (sparc) compiled by GNU C version 1.32.
gcc: Program cc1 got fatal signal 6.

The code:
------------------------------------------------------------------------
computeAngleFromPath (startAngle, endAngle, w, h, lenp, backwards)
	int	startAngle, endAngle;	 
	int	*lenp;
	int	backwards;
{
	double	len;
	double	t0, t1, x0, y0, x1, y1, sidelen;
	int	a, startq, endq, q;
	int	a0, a1;
	a0 = startAngle;
	a1 = endAngle;
	len = *lenp;
	if (backwards) {
		a0 = (64 * 360)  - a0;
		a1 = (64 * 360)  - a1;
	}
	if (a1 < a0)
		a1 += (64 * 360) ;
	startq = floor ((double) a0 / (90.0 * 64.0));
	endq = floor ((double) a1 / (90.0 * 64.0));
	a = a0;
	a0 = a0 - startq * 90 *64;
	a1 = a1 - endq * 90 * 64;
	for (q = startq; q <= endq && len > 0; ++q) {
		if (q == startq && a0 != 0) {
			t0 = (((double) (a0 + startq * 90 * 64)) / 64.0 * 3.14159265358979323846 /180.0) ;
			x0 = (double) w / 2 * cos (t0);
			y0 = (double) h / 2* sin (t0);
		} else {
			x0 = 0;
			y0 = 0;
			switch (((q) >= 0 ? (q) % ( 4) : ( 4) - (-q) % ( 4)) ) {
			case 0: x0 = (double) w/2;	break;
			case 2:	x0 = - (double) w/2;	break;
			case 1:	y0 = (double) h/2;	break;
			case 3:	y0 = -(double) h/2;	break;
			}
		}
		if (q == endq) {
 			if (a1 == 0) {
				x1 = 0;
				y1 = 0;
				switch (((q) >= 0 ? (q) % ( 4) : ( 4) - (-q) % ( 4)) ) {
				case 0: x1 = (double) w/2;	break;
				case 2:	x1 = - (double) w/2;	break;
				case 1:	y1 = (double) h/2;	break;
				case 3:	y1 = -(double) h/2;	break;
				}
			} else {
				t1 = (((double) (a1 + endq * 90 * 64)) / 64.0 * 3.14159265358979323846 /180.0) ;
				x1 = (double) w / 2 * cos(t1);
				y1 = (double) h / 2 * sin(t1);
			}
		} else {
			x1 = 0;
			y1 = 0;
			switch (((q) >= 0 ? (q) % ( 4) : ( 4) - (-q) % ( 4)) ) {
			case 0:	y1 = (double) h/2;	break;
			case 2:	y1 = - (double) h/2;	break;
			case 1:	x1 = -(double) w/2;	break;
			case 3:	x1 = (double) w/2;	break;
			}
		}
		sidelen = sqrt ((x1-x0)*(x1-x0) + (y1-y0) * (y1-y0));
		if (sidelen >= len) {
			x1 = 0;
			y1 = 0;
			switch (((q) >= 0 ? (q) % ( 4) : ( 4) - (-q) % ( 4)) ) {
			case 0:	y1 = (double) h/2;	break;
			case 2:	y1 = -(double) h/2;	break;
			case 1:	x1 = -(double) w/2;	break;
			case 3:	x1 = (double) w/2;	break;
			}
			sidelen = sqrt ((x1-x0) * (x1-x0) + (y1-y0) * (y1-y0));
			y1 = y0 + (y1 - y0) * len / sidelen;
			x1 = x0 + (x1 - x0) * len / sidelen;
			if (x1 == (double) w/2 && y1 == 0)
				a1 = 0;
			else if (x1 == -(double) w/2 && y1 == 0)
				a1 = 180 * 64;
			else if (y1 == (double) h/2 && x1 == 0)
				a1 = 90 * 64;
			else if (y1 == -(double) h/2 && x1 == 0)
				a1 = 270 * 64;
			else {
				if (w == 0) {
					t1 = asin (y1 / ((double) h/2));
					switch (((q) >= 0 ? (q) % ( 4) : ( 4) - (-q) % ( 4)) ) {
					case 1:
					case 2:
						t1 = 3.14159265358979323846  - t1;
					}
				} else if (h == 0) {
					t1 = acos (x1 / ((double) w/2));
					switch (((q) >= 0 ? (q) % ( 4) : ( 4) - (-q) % ( 4)) ) {
					case 2:
					case 3:
						t1 = 2 * 3.14159265358979323846  - t1;
					}
 				} else {
					t1 = atan2 (y1 * w, x1 * h);
				}
				a1 = (t1 * 180/3.14159265358979323846 ) * 64.0;
				if (a1 < 0)
					a1 += (64 * 360) ;
			}
 			a1 -= ((q) >= 0 ? (q) % ( 4) : ( 4) - (-q) % ( 4))  * 90 * 64;
			len = 0;
		} else
			len -= sidelen;
	}
	*lenp = len;
	a1 = a1 + (q-1) * (90*64);
	if (backwards)
		a1 = (64 * 360)  - a1;
	return a1;
}