How are you getting the disassembly? Visual Studio has an option to suppress
optimization when debugging managed code. Make sure that "Tools / Options /
Debugging / Suppress JIT optimization on module load" is not enabled. I
tried your code, and in fact I had to modify it to return the sum, otherwise
the Go method was optimized away, but this is what I see when I disable
'Suppress JIT optimization':
// int i1 = _field1;
00000000 push esi
00000001 mov esi,dword ptr [ecx+4]
// int i2 = this.Property;
00000004 mov edx,dword ptr [ecx+8]
// return i1 + i2;
00000007 add esi,edx
00000009 mov eax, esi
0000000c ret
Fernando Tubio
----- Original Message -----
From: "Keith Hill" <[EMAIL PROTECTED]>
To: <ADVANCED-DOTNET@DISCUSS.DEVELOP.COM>
Sent: Monday, October 30, 2006 2:06 PM
Subject: [ADVANCED-DOTNET] Simple Property Getter Not Inlined
I thought that property getters in optimized bits would get inlined in .NET
but looking at 2.0 bits would indicate that they don't. For example, given
this source:
class App
{
private int _field1 = 7;
private int _field2 = 14;
static void Main()
{
new App().Go();
}
public void Go()
{
int i1 = _field1;
int i2 = this.Property;
int sum = i1 + i2;
}
public int Property
{
get { return _field2; }
}
}
The JIT'er generates the following x86 code:
00000000 push edi
00000001 push esi
00000002 push ebx
00000003 push ebp
00000004 mov esi,ecx
00000006 cmp dword ptr ds:[00928884h],0
0000000d je 00000014
0000000f call 78FB10C6
00000014 xor ebx,ebx
00000016 xor ebp,ebp
00000018 mov eax,dword ptr [esi+4] <<-- direct access to _field1
0000001b mov ebx,eax
0000001d mov ecx,esi
0000001f call dword ptr ds:[00929290h] <<-- calls this.Property
getter
00000025 mov edi,eax
00000027 mov ebp,edi
00000029 nop
0000002a pop ebp
0000002b pop ebx
0000002c pop esi
0000002d pop edi
0000002e ret
Did I just dream that I heard that simple property getters would get inlined
by the JIT'er to be as fast as a direct field access?
--
Keith Hill
Windows PowerShell MVP
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