gcc3.1 regression?

[Jimen Ching <jching at flex dot com>]

Hi all,

The code below seems to be incorrectly compiled by gcc3.1 cvs that I
bootstraped on Debian2.2 (Linux kernel 2.2.17).

g++ -v
Reading specs from
oss/src/fsf/bin/../lib/gcc-lib/i586-pc-linux-gnu/3.1/specs
Configured with: ../gcc/configure --prefix=/home/jching/oss/src/fsf
Thread model: single
gcc version 3.1 20020502 (prerelease)

Note, if you define either REMOVE_CTOR or USE_INT, the problem goes away.
The command line I used is:

g++ -O2 file.cc

If I compile without -O2 and without either of the above macros, then it
is fine.  So the problem is with a combination of the char member data,
with copy constructor and level 2 optimization.

Let me know if more information is needed.  I am willing to test a patch
if necessary.

Thanks.

--jc
-- 
Jimen Ching (WH6BRR)      jching@flex.com     wh6brr@uhm.ampr.org


--------------------------------
#include <iostream>

struct logic
	{
	enum state_value { LO, HI, DC, Z, NVL };

	logic(state_value l = NVL)
		: state(l) { }
#ifndef REMOVE_CTOR
	logic(const logic &l)
		: state(l.state) { }
#endif

#ifdef USE_INT
	int state;
#else
	char state;
#endif
	};

const logic  LO(logic::LO);
const logic  HI(logic::HI);

void func(void);

int
main()
	{
	func();
	return 0;
	}

struct addtab
	{
	logic sum;
	logic carry;
	};
const struct addtab ADDTABLE[] =
	{
	{LO,LO},
	{HI,LO},
	{HI,LO},
	{LO,HI},
	{HI,LO},
	{LO,HI},
	{LO,HI},
	{HI,HI}
	};

void
func(void)
	{
	for (int tmp = 0; tmp < 8; ++tmp)
		{
		std::cout << (int)ADDTABLE[tmp].sum.state
				  << ","
				  << (int)ADDTABLE[tmp].carry.state
				  << std::endl;
		}
	}