🚀 go-pugleaf

 Here's a simple program which is not compiled correctly by gcc 1.35 when
-O is specified.  The same error appears on a SUN 3/50 and on a micro-VAX 3.

 Below is a sample compilation and run on a sun 3/50.  tm.h is linked
to tm-sun3.h and md is linked to m68k.md.  The machine is running the
version of MACH shown in the sample run, but this should not matter.


Thanks,

Juan Leon			jl@cs.cmu.edu

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[redneck]~/gccbugs: cat gcc-bug.c
/* Gives wrong answer when compiled with gcc -O */
main () {
	int row, col;
	int x;
	row = 0;
	for (col = 0; col < 2; col++) {
		x = (row+1)*2+col;
		printf ("x %d\n", x);  
	}
}
[redneck]~/gccbugs: gcc -v -O gcc-bug.c -o gcc-bug
gcc version 1.35 
 /afs/.cs.cmu.edu/misc/gcc/build/obj/@sys/beta/gcc/tst/lib/gcc-cpp -v -undef -D__GNUC__ -Dmc68000 -Dsun -Dunix -D__mc68000__ -D__sun__ -D__unix__ -D__OPTIMIZE__ -D__HAVE_68881__ -Dmc68020 gcc-bug.c /tmp/cc014631.cpp
GNU CPP version 1.35
 /afs/.cs.cmu.edu/misc/gcc/build/obj/@sys/beta/gcc/tst/lib/gcc-cc1 /tmp/cc014631.cpp -quiet -dumpbase gcc-bug.c -O -version -o /tmp/cc014631.s
GNU C version 1.35 (68k, MIT syntax) compiled by GNU C version 1.35.
 /afs/.cs.cmu.edu/misc/gcc/build/obj/@sys/beta/gcc/tst/lib/gcc-as -mc68020 -o gcc-bug.o /tmp/cc014631.s
 /afs/.cs.cmu.edu/misc/gcc/build/obj/@sys/beta/gcc/tst/lib/gcc-ld -o gcc-bug /lib/crt0.o /lib/Mcrt1.o gcc-bug.o /afs/.cs.cmu.edu/misc/gcc/build/obj/@sys/beta/gcc/tst/lib/gcc-gnulib -lc
[redneck]~/gccbugs: gcc-bug
x 2
x 2
[redneck]~/gccbugs: gcc gcc-bug.c -o gcc-bug
[redneck]~/gccbugs: gcc-bug
x 2
x 3
[redneck]~/gccbugs: gcc -O -S gcc-bug.c -o gcc.bug.s
[redneck]~/gccbugs: cat gcc-bug.s
#NO_APP
gcc_compiled.:
.text
LC0:
	.ascii "x %d\12\0"
	.even
.globl _main
_main:
	link a6,#0
	moveml #0x30,sp@-
	subl a2,a2
	clrl d1
	addql #1,d1
	movel d1,a3
	lea a2@(a3:l:2),a3
L5:
	movel a3,sp@-
	pea LC0
	jbsr _printf
	addqw #8,sp
	addqw #1,a2
	moveq #1,d1
	cmpl a2,d1
	jge L5
	moveml a6@(-8),#0xc00
	unlk a6
	rts
[redneck]~/gccbugs: version
Mach/4.3 #5.1(CS1f): Mon Feb 13 18:38:13 EST 1989; kernel/STD+S+WS (RIGEL.FAC.CS.CMU.EDU)
[redneck]~/gccbugs: host
REDNECK.PC.CS.CMU.EDU:128.2.242.26 CPU=SUN-3 OS=UNIX
[redneck]~/gccbugs: 
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