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 m68k gcc 1.30
Message-ID: <8810171935.AA05147@moose.cita.utoronto.ca>
Date: 17 Oct 88 19:35:41 GMT
Sender: daemon@tut.cis.ohio-state.edu
Distribution: gnu
Organization: GNUs Not Usenet
Lines: 133

The following code compiles incorrectly with the "-O
-finline-functions" flags.  This is gcc version 1.30 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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BITNET - quinn@utorphys.bitnet
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The offending assembler:
LBB6:
	.stabd 68,0,54
	fmoves fp0,d0
	.stabd 68,0,56
	fcmps d2,fp0  	# d2 is never set before this point  !!
	fjnlt L95
	movel d2,d0
	jra L96
L95:
	fmoves d0,fp2
	fcmps d3,fp2	# same with d3 !!
	fjngt L97
	movel d3,d0

The compile:
gcc -g -v -S -O -finline-functions -c Scroll.c
gcc version 1.30
 /usr/local/lib/gcc-cpp -v -undef -D__GNU__ -D__GNUC__ -Dmc68000 -Dsun -Dunix -D__OPTIMIZE__ -D__HAVE_68881__ -Dmc68020 Scroll.c /tmp/cca02017.cpp
GNU CPP version 1.30
 /usr/local/lib/gcc-cc1 /tmp/cca02017.cpp -quiet -dumpbase Scroll.c -finline-functions -g -O -version -o Scroll.s
GNU C version 1.30 (68k, MIT syntax) compiled by GNU C version 1.30.

The code:
------------------------------------------------------------------------
typedef struct {
	struct _XDisplay *display; 
} Screen;
typedef struct _XDisplay {
	int fd;			 
} Display;
typedef struct {
	int type;		 
	int x, y;		 
} XKeyEvent;
typedef struct {
	int type;		 
	int x, y;		 
} XButtonEvent;
typedef struct {
	int type;		 
	int x, y;		 
} XMotionEvent;
typedef struct {
	int type;		 
	int x, y;		 
} XCrossingEvent;
typedef union _XEvent {
        int type;		 
	XKeyEvent xkey;
	XButtonEvent xbutton;
	XMotionEvent xmotion;
	XCrossingEvent xcrossing;
} XEvent;
typedef struct _WidgetRec *Widget;
typedef char	Boolean;
typedef int		Position;    
typedef unsigned int	Dimension;   
typedef struct _CorePart {
    Screen	    *screen;		 
    Position        x, y;		 
    Dimension       width, height;	 
} CorePart;
typedef struct _WidgetRec {
    CorePart    core;
 } WidgetRec;
typedef enum {XtorientHorizontal, XtorientVertical} XtOrientation;
typedef struct _ScrollbarRec	  *ScrollbarWidget;
typedef struct {
    XtOrientation orientation;	 
    float	  top;		 
    char	  direction;	 
} ScrollbarPart;
typedef struct _ScrollbarRec {
    CorePart		core;
    ScrollbarPart	scrollbar;
} ScrollbarRec;
static float FloatInRange(num, small, big)
float num, small, big;
{
    return (num < small) ? small : ((num > big) ? big : num);
}
static float FractionLoc(w, x, y)
  ScrollbarWidget w;
  int x, y;
{
    float   result;
    result = ((w->scrollbar.orientation == XtorientHorizontal) ?  (float) x/w->core.width : 
			(float) y/w->core.height) ;
    return FloatInRange(result, 0.0, 1.0);
}
static void ExtractPosition( event, x, y )
    XEvent *event;
    int *x, *y;			 
{
    switch( event->type ) {
      case 	6 :
		*x = event->xmotion.x;	 *y = event->xmotion.y;	  break;
      case 	4 :
      case 	5 :
		*x = event->xbutton.x;   *y = event->xbutton.y;   break;
      case 	2 :
      case 	3 :
		*x = event->xkey.x;      *y = event->xkey.y;	  break;
      case 	7 :
      case 	8 :
		*x = event->xcrossing.x; *y = event->xcrossing.y; break;
      default:
		*x = 0; *y = 0;
    }
}
void MoveThumb( gw, event, params, num_params )
   Widget gw;
   XEvent *event;
   {
    ScrollbarWidget w = (ScrollbarWidget) gw;
    Position x, y;
    if (w->scrollbar.direction == 0) return;  
    ExtractPosition( event, &x, &y );
    w->scrollbar.top = FractionLoc(w, x, y);
    PaintThumb(w);
    XFlush(((w)->core.screen->display) );	 
}