dale@boing.UUCP (Dale Luck) (07/16/89)
I'm posting this so that others are aware of this particular
code problem. This is an excerpted section of the Xlib from
X11 that when compiled under Lattice does not work.
Found a bug in Lattice 5.02 code generation.
It seems to loose it on register allocation
and who has what.
foo(dpy, req, valuemask, attributes)
register int *dpy;
long *req;
register unsigned long valuemask;
register long *attributes;
{
unsigned long values[32];
register unsigned long *value = values;
long qwe = 0;
unsigned int nvalues;
if (valuemask & 0x1)
*value++ = *attributes;
/* following statement is compiler incorrectly */
qwe += (nvalues = value - values);
nvalues <<= 2;
bar(dpy, (long *)values, (long)nvalues);
}
Lattice AMIGA 68000-68020 OBJ Module Disassembler V5.00
Copyright ) 1988 Lattice Inc. All Rights Reserved.
Amiga Object File Loader V1.00
68000 Instruction Set
EXTERNAL DEFINITIONS
_foo 0000-00
SECTION 00 "bug1.c" 00000054 BYTES
| 0000 4E 55 FF 74 LINK A5,#FF74
| 0004 BF EC 00 00-XX.2 CMPA.L __base(A4),A7
| 0008 65 00 00 00-XX.1 BCS.W __xcovf
| 000C 48 E7 07 30 MOVEM.L D5-D7/A2-A3,-(A7)
| 0010 26 6F 00 A8 MOVEA.L 00A8(A7),A3
| 0014 2E 2F 00 B0 MOVE.L 00B0(A7),D7
| 0018 24 6F 00 B4 MOVEA.L 00B4(A7),A2
| 001C 41 ED FF 80 LEA FF80(A5),A0
| 0020 7C 00 MOVEQ #00,D6
| 0022 2B 48 FF 7C MOVE.L A0,FF7C(A5)
| 0026 08 07 00 00 BTST #0000,D7
| 002A 67 06 BEQ.B 0032
| 002C 20 D2 MOVE.L (A2),(A0)+
| 002E 2B 48 FF 7C ******* MOVE.L A0,FF7C(A5) ; begin bogosity
| 0032 20 08 ******* MOVE.L A0,D0 ;
| 0034 90 88 ******* SUB.L A0,D0 ; this won't work!
| 0036 E4 80 ASR.L #2,D0
| 0038 2A 00 MOVE.L D0,D5
| 003A DC 85 ADD.L D5,D6
| 003C E5 85 ASL.L #2,D5
| 003E 2F 05 MOVE.L D5,-(A7)
| 0040 2F 08 MOVE.L A0,-(A7)
| 0042 2F 0B MOVE.L A3,-(A7)
| 0044 4E BA 00 00-XX.1 JSR _bar(PC)
| 0048 4C ED 0C E0 FF 60 MOVEM.L FF60(A5),D5-D7/A2-A3
| 004E 4E 5D UNLK A5
| 0050 4E 75 RTS
So is there a patch somewhere to fix this? If I put
a printf around the statement the bug goes away!
Dale Luck GfxBase/Boing, Inc. 408-262-1469
{uunet!cbmvax|pyramid}!amiga!boing!dale
Oh, by the way, after I patched around it with printfs I got my first
native compiled, linked X Window lattice program to run on the Amiga.
Good bye unix.
--
Dale Luck GfxBase/Boing, Inc.
{uunet!cbmvax|pyramid}!amiga!boing!dale