Path: utzoo!telly!ddsw1!lll-winken!killer!pollux!ti-csl!cs.utexas.edu!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 1.32
Message-ID: <8901201214.AA03028@moose.cita.utoronto.ca>
Date: 20 Jan 89 12:14:23 GMT
Sender: daemon@tut.cis.ohio-state.edu
Distribution: gnu
Organization: GNUs Not Usenet
Lines: 186

The following code generates incorrect assembly when compiled with the
"-g -O -fforce-mem" options.  This is gcc version 1.32 on a Sun 3/50
running SunOs 3.5.  The problem is that the assignment on line 117
from the long to the short grabs the wrong half of the long.

Tom Quinn                 Canadian Institute for Theoretical Astrophysics
trq@moose.cita.utoronto.ca
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BITNET - quinn@utorphys.bitnet
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The compile:

gcc -S -g -v -O -fforce-mem -c XConnDis.c
gcc version 1.32
/usr/local/lib/gcc-cpp -v -undef -D__GNUC__ -Dmc68000 -Dsun -Dunix -D__mc68000__ -D__sun__ -D__unix__ -D__OPTIMIZE__ -D__HAVE_68881__ -Dmc68020 XConnDis.c /tmp/cca15882.cpp
GNU CPP version 1.32
/usr/local/lib/gcc-cc1 /tmp/cca15882.cpp -quiet -dumpbase XConnDis.c -fforce-mem -g -O -version -o XConnDis.s
GNU C version 1.32 (68k, MIT syntax) compiled by GNU C version 1.32.

The offending assembly:
L20:
       .stabd 68,0,117
       movew a0@(8),a6@(-272) # this should be a "movew a0(10),a6@(-272)"
       .stabd 68,0,120

The code:
------------------------------------------------------------------------
typedef	unsigned char	u_char;
typedef	unsigned short	u_short;
typedef	unsigned long	u_long;
char	*strcat();
int	strcmp();
char	*strcpy();
int	strlen();
struct in_addr {
       union {
	       struct { u_char s_b1,s_b2,s_b3,s_b4; } S_un_b;
	       struct { u_short s_w1,s_w2; } S_un_w;
	       u_long S_addr;
       } S_un;
};
struct sockaddr_in {
       short	sin_family;
       u_short	sin_port;
       struct	in_addr sin_addr;
       char	sin_zero[8];
};
struct	hostent {
       char	*h_name;	 
       char	**h_aliases;	 
       int	h_addrtype;	 
       int	h_length;	 
       char	*h_addr;	 
};
char *strncpy();
extern char *index();
extern int errno;
struct sockaddr {
       u_short	sa_family;		 
       char	sa_data[14];		 
};
struct	sockaddr_un {
       short	sun_family;		 
       char	sun_path[109];		 
};
void bcopy();
int _XConnectDisplay (display_name, expanded_name, prop_name, screen_num)
   char *display_name;
   char *expanded_name;	 
   char *prop_name;		 
   int *screen_num;		 
{
       char displaybuf[256];		 	
       register char *display_ptr;	 
       register char *numbuf_ptr;	 
       char *screen_ptr;		 
       int display_num;		 
       struct sockaddr_in inaddr;	 
       unsigned long hostinetaddr;	 
       struct sockaddr_un unaddr;	 
       struct sockaddr *addr;		 
       struct hostent *host_ptr;
       int addrlen;			 
       extern char *getenv();
       extern struct hostent *gethostbyname();
       int fd;				 
       char numberbuf[16];
       char *dot_ptr = 0 ;		 
       (void) strncpy(displaybuf, display_name, sizeof(displaybuf));
       if ((display_ptr = index((displaybuf), (':')) ) == 0 ) return (-1);
       *(display_ptr++) = '\0';
       if (*display_ptr == '\0') return(-1);
       screen_ptr = display_ptr;		 
       numbuf_ptr = numberbuf;			 
       while (*screen_ptr != '\0') {
	   if (*screen_ptr == '.') {		 
	       if (dot_ptr) {			 
		   screen_ptr++;
		   break;
	       }
	       dot_ptr = numbuf_ptr;		 
	       *(screen_ptr++) = '\0';
	       *(numbuf_ptr++) = '.';
	   } else {
	       *(numbuf_ptr++) = *(screen_ptr++);
	   }
       }
       if (dot_ptr == 0 ) {			 
	   dot_ptr = numbuf_ptr;
	   *(numbuf_ptr++) = '.';
	   *(numbuf_ptr++) = '0';
       } else {
	   if (*(numbuf_ptr - 1) == '.')
	       *(numbuf_ptr++) = '0';
       }
       *numbuf_ptr = '\0';
       *screen_num = atoi(dot_ptr + 1);
       strcpy (prop_name, screen_ptr);
       display_num = atoi(display_ptr);
       if (displaybuf[0] == '\0')
	       ;	 
       {
	   if ((displaybuf[0] == '\0') || 
	       (strcmp("unix", displaybuf) == 0)) {
	       unaddr.sun_family = 	1		;
	       (void) strcpy(unaddr.sun_path, "/tmp/.X11-unix/X" );
	       strcat(unaddr.sun_path, display_ptr);
	       addr = (struct sockaddr *) &unaddr;
	       addrlen = strlen(unaddr.sun_path) + 2;
	       if ((fd = socket((int) addr->sa_family, 1		, 0)) < 0)
		   return(-1);	     
	   } else
	   {
	       hostinetaddr = inet_addr (displaybuf);
	       if (hostinetaddr == -1) {
		       if ((host_ptr = gethostbyname(displaybuf)) == 0 ) {
			       errno = 	22		;
			       return(-1);
		       }
		       if (host_ptr->h_addrtype != 	2		) {
			       errno = 41		;
			       return(-1);
		       }
		       inaddr.sin_family = host_ptr->h_addrtype;
		       bcopy((char *)host_ptr->h_addr, 
			     (char *)&inaddr.sin_addr, 
			     sizeof(inaddr.sin_addr));
	       } else {
		       inaddr.sin_addr.S_un.S_addr	 = hostinetaddr;
		       inaddr.sin_family = 	2		;
	       }
	       addr = (struct sockaddr *) &inaddr;
	       addrlen = sizeof (struct sockaddr_in);
	       inaddr.sin_port = display_num;
	       inaddr.sin_port += 6000     ;
	       inaddr.sin_port = (inaddr.sin_port) ;
	       if ((fd = socket((int) addr->sa_family, 1		, 0)) < 0)
		   return(-1);	     
	       {
	       int mi = 1;
	       setsockopt (fd, 	6		, 0x01	, &mi, sizeof (int));
	       }
	   }
	   if (connect(fd, addr, addrlen) == -1) {
	       (void) close (fd);
	       return(-1); 	     
	   }
       }
       (void) fcntl(fd, 4	, 	00004		);
       display_ptr = displaybuf-1;
       while (*(++display_ptr) != '\0')
	   ;
       *(display_ptr++) = ':';
       numbuf_ptr = numberbuf;
       while (*numbuf_ptr != '\0')
	   *(display_ptr++) = *(numbuf_ptr++);
       if (prop_name[0] != '\0') {
	   char *cp;
	   *(display_ptr++) = '.';
	   for (cp = prop_name; *cp; cp++) *(display_ptr++) = *cp;
       }
       *display_ptr = '\0';
       (void) strcpy(expanded_name, displaybuf);
       return(fd);
}