GCC Optimization Error

[chenzhi <chenzhi10 at gmail dot com>]

Dear gcc-developers,

The attachment is a sample source code that shows an error of
gcc-optimization(O2, O3 and Os).
gcc version 4.4.7 20120313

Best regards,

chenzhi

//============================================================================
// Name        : hello.cpp
// Author      : chenzhi
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C, Ansi-style
//============================================================================

#include <stdio.h>

template<typename _Type> class array_t
{
	size_t m_item_count;
	_Type* m_item_array[15];
public:
	array_t(void){
		m_item_count = 0;
	}
	~array_t(void){
	}
	size_t append_item(_Type *_ptr){
		m_item_array[m_item_count] = _ptr;
		return ++m_item_count;
	}
	size_t get_count(void) const {
		return m_item_count;
	}
	const _Type& get_item(size_t _index) const {
		return *m_item_array[_index];
	}
	_Type* find_item(_Type *_ptr) const {
		for(size_t i = 0; i < m_item_count; ++i){
			_Type *_item = m_item_array[i];
			if(*_item == *_ptr)
				return _item;
		}
		return 0;
	}
};

struct IDString
{
	unsigned char m_id;
	unsigned char m_len;
	char m_str[6];
	friend bool operator ==(const IDString &_r1, const IDString &_r2){
		return (_r1.m_id == _r2.m_id) ? true : false;
	}
};
class IDString_Array : public array_t<IDString>
{
	IDString *find_idstring(size_t _id){
		return find_item((IDString*)&_id);
	}
public:
	IDString_Array(IDString *_id_strings, size_t _count){
		for(size_t i = 0; i < _count; ++i){
			append_item(&_id_strings[i]);
		}
	}
	~IDString_Array(void){
	}
	const char *get_default_string(void){
		IDString *_ids = find_idstring(2);
		return (_ids) ? _ids->m_str : "Cannot find!!!";
	}
	void print_all_elements(void){
		size_t n = get_count();
		for(size_t i = 0; i < n; ++i){
			const IDString &_ids = get_item(i);
			printf("id=%u\tlen=%u\tstring=\"%s\"\n", _ids.m_id, _ids.m_len, _ids.m_str);
		}
	}
};

static IDString g_idstrings[] = {
	{1, 4, "id=1"},{2, 4, "id=2"},{3, 4, "id=3"},{4, 4, "id=4"},
	{5, 4, "id=5"},{6, 4, "id=6"},{7, 4, "id=7"},{8, 4, "id=8"}
};
int main(void)
{
	IDString_Array idstring_array(g_idstrings, sizeof(g_idstrings)/sizeof(g_idstrings[0]));
	idstring_array.print_all_elements();
	const char *_str = idstring_array.get_default_string();
	int len = printf("%s\n", _str);
	return len;
}

Attachment: Makefile
Description: Binary data