使用优化标志编译C.

我的问题是：

为什么在优化的汇编版本中,编译器将main函数放在所有辅助函数之后,而辅助函数在原始汇编代码中首先出现.这在效率方面意味着什么？有人可以详细说明吗？

这是原始的C文件.谢谢！

// Based on a source file found in a beginner's discussion on multidimensional arrays here:
// http://www.dreamincode.net/forums/topic/71617-3d-arrays/

#include <stdio.h>
#include <string.h>

int validColor( char *str );
int mathProblem( char *str );

// 1) Asks from six 'theoretical' different users one of two questions,// allowing only three answers for each.
// 2) Stores the response into a multidimensional array

int main( void )
{
        char myArray[ 6 ][ 3 ][ 20 ]; /* Six users,three questions,and up to 19 characters per answer
(strings are '' terminated),though no "true" answer is that long */
        int i,valid;

/* User instructions */
        for( i = 0; i < 6; i++ )
        {
if ( i % 2 == 0 )
{
valid = 0;
while( valid == 0 )
{
                 printf( "Enter your favorite color : " );

                 fgets( myArray[ i ][ 0 ],20,stdin ); /* Get answer to first question */

if( myArray[ i ][ 0 ][ 0 ] == 'n' ) /* If the user just presses enter,move to next question */
break; /* Jump out of while loop */

valid = validColor( myArray [i ][ 0 ] ); /* Call function to validate answer */
}
}
if ( i % 2 == 1 )
{
valid = 0;
while( valid == 0)
                        {
                                printf( "The roots of (x - 4)^2 : " );

                                fgets(myArray[ i ][ 0 ],stdin); /* Get answer to second question */

                                if(myArray[ i ][ 0 ][ 0 ] == 'n') /* If the user just presses enter,move to next question */
                                        break; /* Jump out of while loop */

                                valid = mathProblem( myArray[ i ][ 0 ] ); /* Call function to validate answer */
                        }
}
        }

        return 0;
}

int validColor( char *str )
{
if( strcmp( str,"Blackn" ) == 0 )
return 1;
if( strcmp( str,"Redn" ) == 0 )
return 1;
if( strcmp( str,"Bluen" ) == 0 )
return 1;

return 0; /* If no match above,answer is not valid */
}

int mathProblem( char *str )
{
if ( atoi( str ) == 2 ) /* Function call for analysis purposes */
return 1;
if ( strcmp( str,"-2n" ) == 0 )
return 1;
if ( strcmp( str,"+2n" ) == 0 )
return 1;

return 0; /* If no match above,answer is not valid */
}