How to view disassembly for optimized speed builds in Visual Studio - visual-studio

Question

I have a C program in Visual Studio where I would like to compare the disassembly between the standard debug build and a build where speed is optimized.
For standard debug things work perfectly, I set a breakpoint and then right-click "Goto Dissassembly" to view the equivalent assembly code.
However, when I try to do that when the optimized for speed switch is enabled, I only see part of the assembly.
My procedure for creating an optimized speed build is (staying in the debug build configuration):
From the project properties -> C/C++->Optimization change Optimization from disabled /Od to Optimize for maximize speed /O2 and changing favor Size or Speed to 'Favor Fast Code /Ot)
Under Code Generation ->Basic Runtime checks change to 'Default'
Note: I decided to modify my debug configuration and not do a full optimization (which includes size) because I wanted to preserve my code symbols.
As part of my investigation, I created a trivial program for testing. Here is the source:
#include<stdio.h>
int main()
{
int x = 0;
int y = 0;
printf("The value of x is %d\n", x);
while (1)
{
++x;
if (x > 1000000)
break;
}
y = x;
printf("The value of y is %d\n", y);
return 0;
}
In full debug mode here is my disassembly: Note: I can easily see what is happening in the WHILE LOOP
int x = 0;
00CF1779 mov dword ptr [x],0
int y = 0;
00CF1780 mov dword ptr [y],0
printf("The value of x is %d\n", x);
00CF1787 mov eax,dword ptr [x]
00CF178A push eax
00CF178B push offset string "The value of x is %d\n" (0CF6B30h)
00CF1790 call _printf (0CF1320h)
00CF1795 add esp,8
while (1)
00CF1798 mov eax,1
00CF179D test eax,eax
00CF179F je main+47h (0CF17B7h)
{
++x;
00CF17A1 mov eax,dword ptr [x]
00CF17A4 add eax,1
00CF17A7 mov dword ptr [x],eax
if (x > 1000000)
00CF17AA cmp dword ptr [x],0F4240h
00CF17B1 jle main+45h (0CF17B5h)
break;
00CF17B3 jmp main+47h (0CF17B7h)
}
00CF17B5 jmp main+28h (0CF1798h)
y = x;
00CF17B7 mov eax,dword ptr [x]
00CF17BA mov dword ptr [y],eax
printf("The value of y is %d\n", y);
00CF17BD mov eax,dword ptr [y]
00CF17C0 push eax
00CF17C1 push offset string "The value of y is %d\n" (0CF6BE8h)
00CF17C6 call _printf (0CF1320h)
00CF17CB add esp,8
return 0;
Here is the disassembly from the optimized speed build - note there is no code shown for the while loop routine
int x = 0;
int y = 0;
printf("The value of x is %d\n", x);
00EE16F0 push 0
00EE16F2 push offset string "The value of x is %d\n" (0EE6B30h)
00EE16F7 call _printf (0EE1320h)
while (1)
{
++x;
if (x > 1000000)
break;
}
y = x;
printf("The value of y is %d\n", y);
00EE16FC push 0F4241h
00EE1701 push offset string "The value of y is %d\n" (0EE6BE8h)
00EE1706 call _printf (0EE1320h)
00EE170B add esp,10h
return 0;
00EE170E xor eax,eax
}
00EE1710 ret
Both builds output the same values for x and y in the printf statements.
Does anyone know how to solve my problem?