Properties set/get huge speed difference?

[ephemeros]

Hello,

anyone knows why getting/setting the class properties by invoking the 
methods is so slow (~20 times slower - gdc/ubuntu/amd32) comparing with 
doing the same things directly, with the "=" operator (public 
properties)? this matters in an app with thousands of evaluations per 
loop, also the methods are needed to compose different behaviors, etc.
i give here a little "get" example:

//=======================
// src/clasamare.d

module src.clasamare;

class ClasaMare
{
	//private:
	float val;
	
	//public:
	void value(float newValue)
	{
		val=newValue;
	}
	float value()
	{
		return val;
	}
}
//=========================

this runs slower(~0.450s):

//=========================
// src/test.d

import src.clasamare;
import std.cstream;

int main()
{
	ClasaMare cls1=new ClasaMare();
	for(uint i=0; i<100000000; i++)
	{
		cls1.value=15.7;
	}
	dout.writefln("%f", cls1.value);
	return 0;
}
//==========================

this is faster(~0.020s):

//=========================
// src/test.d

import src.clasamare;
import std.cstream;

int main()
{
	ClasaMare cls1=new ClasaMare();
	for(uint i=0; i<100000000; i++)
	{
		cls1.val=15.7;
	}
	dout.writefln("%f", cls1.value);
	return 0;
}
//==========================

i compiled with this command:

gdc -frelease -s -O3 -fomit-frame-pointer -mmmx -msse -mfpmath=sse 
-mfancy-math-387 -minline-all-stringops -fschedule-insns2 
-frerun-loop-opt -frerun-cse-after-loop -funroll-loops 
-fexpensive-optimizations -finline-functions -o made test.d 
src/clasamica.d src/clasamare.d

when i compile with:
gdmd -O -release -inline test.d src/clasamica.d src/clasamare.d
the times are 0.450s/0.150s

thank you