Re: Some questions about optimization and inline

From:

"telnet2008" <telnet2008@gmail.com>

Newsgroups:

microsoft.public.vc.language

Date:

Mon, 12 Mar 2007 14:19:10 +0800

Message-ID:

<#PHHc5GZHHA.4220@TK2MSFTNGP03.phx.gbl>

if I close the optimiztion(/0d)setting of this program(vs2003 release), I
can find f() in the disassemble output file.
but if I open /0d,even add some parameters,returned something, and defined
a local variable,I also cannot find f() in the disassemble output file.

"Scot T Brennecke" <ScotB@MVPs.spamhater.org> ????????????
:OeO1ahGZHHA.3628@TK2MSFTNGP02.phx.gbl...

You simplified f() until it did nothing but call another function. It

took no parameters, returned

nothing, and had no local variables. It was useless.

"telnet2008" <telnet2008@gmail.com> wrote in message

news:OgsycQGZHHA.2552@TK2MSFTNGP06.phx.gbl...

Thankx,Brennecke.
you answer my first question: cannot find func,func1 in the disassemble
output file.
But how to explain f()?
waiting..........

"Scot T Brennecke" <ScotB@MVPs.spamhater.org> ????????????
:#tQdALGZHHA.1008@TK2MSFTNGP03.phx.gbl...

Optimization. If you simplify the function enough, or don't call it,

doesn't need to exist, so

it is excluded to reduce the size of the executable.

"telnet2008" <telnet2008@gmail.com> wrote in message

news:enpfszFZHHA.2436@TK2MSFTNGP06.phx.gbl...

Hi,everyone:

the questionly code:
#include <iostream>

using namespace std;
class test
{
   int x;

void func()
       {

       };
void func1()
       {
  x = 1;
       };

public:
   void f()
       {
    printf("%x\n",&x);
           printf("%x\n",&test::func );
           printf("%x\n",&test::func1 );
       };
};

int main()
{
test a;
   a.f();
test * ap = &a;
void(test::*pmem)(void)=&test::f;
       printf("%x\n",pmem );
test b;
   b.f();
test * bp = &b;
   return 0;
}

if delete this 2 statements: printf("%x\n",&test::func );
                                 printf("%x\n",&test::func1 );
in vs2003-release,in export map file and disassemble output

file(dumpbin),

cannot find the location of "func()"??"func1()".

if delete this 3 statements: test * ap = &a;

void(test::*pmem)(void)=&test::f;
printf("%x\n",pmem );
test b;
in vs2003-release,in export map file and disassemble output file,

cannot

find the location of "f()".

why?

if I define test::f() out of the class test, like this:

class test
{
   int x;

void func()
       {

       };
void func1()
       {
  x = 1;
       };

public:
   void f();
};

void test::f()
       {
           printf("%x\n",&x);
           //printf("%x\n",&test::func );
           //printf("%x\n",&test::func1 );
       };

I also cannot find the location of "f()" in the output disassemble

file

,why?