🚀 go-pugleaf

Greetings, 

I've encountered a problem with G++ 1.32 on an Encore Multimax (NS32000) in the
apparent management of temporary stack space.  In re-using pending stack space
where the space needed is smaller than the space available it seems to get
confused.  The following example should help clarify the problem:

Compile the following source:

g++ version 1.32.0
 /usr/local/lib/gcc-cpp -+ -v -undef -D__GNU__ -D__GNUG__ -Dns32000 -Dn16 -Dns16000 -Dns32332 -Dunix -D__OPTIMIZE__ tuna.cc /tmp/cc011412.cpp
GNU CPP version 1.32
 /usr/local/lib/gcc-c++ /tmp/cc011412.cpp -quiet -dumpbase tuna.cc -fchar-charconst -opt -version -o tuna.s
GNU C++ version 1.32.0 (32000, Encore syntax) compiled by CC.
In function int main ():
tuna.cc:30: warning: variable `x' never used

-----------------------------------------------------------------------------
#include "stream.h"

class Point {
	long xc;
	long yc;
public:
	Point(long newx=0, long newy =0)		{ xc=newx; yc=newy; }
	friend Point operator*(Point p, long i) { return Point(i*p.xc, i*p.yc); }
	friend Point operator*(long i, Point p)	{ return Point(i*p.xc, i*p.yc); }
	friend Point operator/(Point p, long i) { return Point(p.xc/i, p.yc/i); }
	friend Point operator/(long i, Point p)	{ return Point(i/p.xc, i/p.yc); }
};

class Rect {
	Point	or;
	Point	sz;
public:
	Rect(Point o, Point s)					{ or=o; sz=s; }
	Point	origin()						{ return or; }
	Point	size()							{ return sz; }
};


main ()
{
	Rect	r( Point ( 10, 10 ), Point ( 20, 20 ) );

// problem occurs with code generated for the following line:
	Point x = r.size()*10/100;
}

-----------------------------------------------------------------------------

generates the following code

-----------------------------------------------------------------------------

	.align 16
.globl _main
_main:
	enter [r3,r4],24
	adjspb $20						# we add 20 to stack
	addr 12(sp),r0
	addr @20,tos					# we add another 4
	addr @20,tos					# we add another 4
	movd r0,tos						# we add another 4
	addr _Point_PSPoint_lSI_lSI,r3
	jsr r3
	adjspb $-12						# back to 20
	addr 4(sp),r0
	addr @10,tos					# we add another 4
	addr @10,tos					# we add another 4
	movd r0,tos						# we add another 4
	jsr r3
	adjspb $-12						# back to 20
	addr -16(fp),r3
	movd r3,0(sp)
	bsr ?_Rect_PSRect_SPoint_SPoint
									# we still have 20 on stack
	addr @100,8(sp)					# <- we should have the stack at 12, or
	addr tos,r4
	adjspb $4						# <- we should be adding another 12 here
	addr @10,8(sp)
	addr tos,r2
	movd r3,tos
	bsr ?_size_PSRect
	cmpqd $0,tos # adjsp -4
	movd r4,r2
	bsr ?_op$mult_expr_SPoint_lSI
	adjspb $-12
	addr -24(fp),r2
	bsr ?_op$trunc_div_expr_SPoint_lSI
	adjspb $-12
	exit [r4,r3]
	ret 0

-----------------------------------------------------------------------------

Good luck!

Rick