I've just updated my prior article on virtual function overhead Buy Flagyl Without Prescription, with corrected timing numbers — I hadn't noticed that my CPU cycle counts were only 32 bits wide so timings of more than 2secs would wrap back around to zero.
If you want to run this test on your own hardware, I've put my code below the jump. You'll have to build your own CFastTimer class, but it should be pretty clear what it does -- it simply reads out of the CPU clock-cycle counter and computes a difference.
file 1: class definitions header
class TestVector4_Virtual
{
public:
virtual float GetX() const;
virtual float SetX( float in );
virtual float GetY() const;
virtual float SetY( float in );
virtual float GetZ() const;
virtual float SetZ( float in );
virtual float GetW() const;
virtual float SetW( float in );
private:
float x,y,z,w;
};
class TestVector4_Direct
{
public:
__declspec(noinline) float GetX() const;
__declspec(noinline) float SetX( float in );
__declspec(noinline) float GetY() const;
__declspec(noinline) float SetY( float in );
__declspec(noinline) float GetZ() const;
__declspec(noinline) float SetZ( float in );
__declspec(noinline) float GetW() const;
__declspec(noinline) float SetW( float in );
private:
float x, Online buy Flagyl without a prescription, y,z,w;
};
class TestVector4_Inline
{
public:
inline float GetX() const;
inline float SetX( float in );
inline float GetY() const;
inline float SetY( float in );
inline float GetZ() const;
inline float SetZ( float in );
inline float GetW() const;
inline float SetW( float in );
private:
float x,y,z,w;
};
inline float TestVector4_Inline::GetX() const
{
return x;
}
inline float TestVector4_Inline::SetX( float in )
{
return x = in;
}
/* and so on for GetY, Z, W... */
file 2: class definitions cpp
These functions are defined here to prevent the compiler from inlining them when they're used.
float TestVector4_Virtual::GetX() const
{
return x;
}
float TestVector4_Virtual::SetX( float in )
{
return x = in;
}
/* and so on for y,z,w.., Buy Flagyl Without Prescription. */
float TestVector4_Direct::GetX() const
{
return x;
}
float TestVector4_Direct::SetX( float in )
{
return x = in;
}
/* and so on for y, Flagyl dangers,z,w... */
file 3: test loop
#define ARRAY_SIZE 1024
#define TEST_ITERATIONS 10000
template
void InitWithRandom( T *ptr, int num )
{
while( num > 0 )
{
ptr->SetX( RandomFloat(-1024.f, 1024.0f) );
ptr->SetY( RandomFloat(-1024.f, 1024.0f) );
ptr->SetZ( RandomFloat(-1024.f, 1024.0f) );
ptr->SetW( RandomFloat(-1024.f, 1024.0f) );
++ptr;
--num;
}
}
template
void SumTest( T * RESTRICT in1, Flagyl coupon, T * RESTRICT in2, T * RESTRICT out, const int num )
{
for ( int i = 0; i < num ; ++i )
{
out[i].SetX( in1[i].GetX() + in2[i].GetX() );
out[i].SetY( in1[i].GetY() + in2[i].GetY() );
out[i].SetZ( in1[i].GetZ() + in2[i].GetZ() );
out[i].SetW( in1[i].GetW() + in2[i].GetW() );
}
}
template
float TestTimings( )
{
// set up input and output and preheat the cache
T A[ ARRAY_SIZE ];
T B[ ARRAY_SIZE ];
T C[ ARRAY_SIZE ];
InitWithRandom( A , ARRAY_SIZE );
InitWithRandom( B , ARRAY_SIZE );
InitWithRandom( C , ARRAY_SIZE );
uint64 retval = 0;
CFastTimer t1;
int dontOptimizeThisLoopToNothing = 0;
for ( int i = 0 ; i < N_ITERS ; ++i )
{
t1.Start();
SumTest( A, B, C, ARRAY_SIZE );
t1.End();
dontOptimizeThisLoopToNothing += i;
retval += t1.GetClockCycleDelta();
}
// force compiler to actually use the data so it doesn't vanish the loop above
float ac = 0;
for ( int i = 0 ; i < ARRAY_SIZE ; ++i )
{
ac += C[i].GetX();
ac += C[i].GetY();
ac += C[i].GetZ();
ac += C[i].GetW();
}
printf( "%f %d\n", ac, where can i buy cheapest Flagyl online, dontOptimizeThisLoopToNothing ); // just ignore these
return CyclesToMilliseconds(retval) ;
}
void RunTest()
{
// get timings for each type
float tVirt, tDirect, tInline;
tVirt = TestTimings< TestVector4_Virtual >();
tDirect = TestTimings< TestVector4_Direct >();
tInline = TestTimings< TestVector4_Inline >();
printf( "\n%d iterations over %d vectors\n", TEST_ITERATIONS , ARRAY_SIZE );
printf( "virtual: %.3f ms\n", tVirt );
printf( "direct: %.3f ms\n", tDirect );
printf( "inline: %.3f ms\n", tInline );
}
Assembly output
And,
Japan, craiglist, ebay, overseas, paypal, just in case you're curious, here's the assembly the compiler generates for the different versions of
SumTest:
Direct Function
; Begin code for function: ??$SumTest@VTestVector4_Direct@@@@YAXPIAVTestVector4_Direct@@00H@Z
; 58 : {
mflr r12
bl __savegprlr_26
stfd fr31,-40h(r1)
stwu r1,-90h(r1)
.endprolog
$M89780:
; 59 : for ( int i = 0; i < num ; ++i )
cmpwi cr6,r6,0
ble cr6,$LN1@SumTest@2
mr r31,r4
subf r27,r4,r3
subf r26, my Flagyl experience,r4,r5
mr r28,r6
$LL3@SumTest@2:
; 60 : {
; 61 : out[i].SetX( in1[i].GetX() + in2[i].GetX() );
add r30,r27,r31
add r29,r26,r31
mr r3,r30
bl ?GetX@TestVector4_Direct@@QBAMXZ
mr r3, Fast shipping Flagyl, r31
fmr fr31,fr1
bl ?GetX@TestVector4_Direct@@QBAMXZ
mr r3,r29
fadds fr1,fr31,fr1
bl ?SetX@TestVector4_Direct@@QAAMM@Z
; 62 : out[i].SetY( in1[i].GetY() + in2[i].GetY() );
mr r3,r30
bl ?GetY@TestVector4_Direct@@QBAMXZ
mr r3,r31
fmr fr31,fr1
bl ?GetY@TestVector4_Direct@@QBAMXZ
mr r3,r29
fadds fr1,fr31, where to buy Flagyl,fr1
bl ?SetY@TestVector4_Direct@@QAAMM@Z
; 63 : out[i].SetZ( in1[i].GetZ() + in2[i].GetZ() );
mr r3,r30
bl ?GetZ@TestVector4_Direct@@QBAMXZ
mr r3,r31
fmr fr31,fr1
bl ?GetZ@TestVector4_Direct@@QBAMXZ
mr r3,r29
fadds fr1,fr31,fr1
bl ?SetZ@TestVector4_Direct@@QAAMM@Z
; 64 : out[i].SetW( in1[i].GetW() + in2[i].GetW() );
mr r3,r30
bl ?GetW@TestVector4_Direct@@QBAMXZ
mr r3, Online buying Flagyl hcl, r31
fmr fr31,fr1
bl ?GetW@TestVector4_Direct@@QBAMXZ
mr r3,r29
fadds fr1,fr31,fr1
bl ?SetW@TestVector4_Direct@@QAAMM@Z
addic. r28,r28,-1 ; 0FFFFh
addi r31,r31,16 ; 10h
bne $LL3@SumTest@2
$LN1@SumTest@2:
; 65 : }
; 66 : }
addi r1, Flagyl over the counter,r1,144 ; 90h
lfd fr31,-40h(r1)
b __restgprlr_26
$M89781:
; End code for function: ??$SumTest@VTestVector4_Direct@@@@YAXPIAVTestVector4_Direct@@00H@Z
Virtual Function
??$SumTest@VTestVector4_Virtual@@@@YAXPIAVTestVector4_Virtual@@00H@Z PROC NEAR ; SumTest, COMDAT
; Begin code for function: ??$SumTest@VTestVector4_Virtual@@@@YAXPIAVTestVector4_Virtual@@00H@Z
; 58 : {
mflr r12
bl __savegprlr_25
stfd fr31,-48h(r1)
stwu r1,-0A0h(r1)
.endprolog
$M89754:
; 59 : for ( int i = 0; i < num ; ++i )
cmpwi cr6,r6,0
ble cr6, Fast shipping Flagyl, $LN1@SumTest
mr r31,r4
subf r30,r4,r3
subf r29,r4,r5
mr r26,r6
$LL3@SumTest:
; 60 : {
; 61 : out[i].SetX( in1[i].GetX() + in2[i].GetX() );
lwz r11,0(r31)
add r28,r29,r31
lwzx r25, what is Flagyl,r29,r31
add r27,r30,r31
mr r3,r31
lwz r10,0(r11)
mtctr r10
bctrl
lwzx r9,r30,r31
mr r3, Flagyl pharmacy, r27
fmr fr31,fr1
lwz r8,0(r9)
mtctr r8
bctrl
lwz r7,4(r25)
mr r3,r28
fadds fr1,fr31,fr1
mtctr r7
bctrl
; 62 : out[i].SetY( in1[i].GetY() + in2[i].GetY() );
lwz r6,0(r31)
mr r3,r31
lwz r5,8(r6)
lwzx r25, Flagyl description,r29,r31
mtctr r5
bctrl
lwzx r4,r30,r31
mr r3,r27
fmr fr31,fr1
lwz r11,8(r4)
mtctr r11
bctrl
lwz r10,0Ch(r25)
mr r3, Buy generic Flagyl, r28
fadds fr1,fr31,fr1
mtctr r10
bctrl
; 63 : out[i].SetZ( in1[i].GetZ() + in2[i].GetZ() );
lwz r9,0(r31)
mr r3,r31
lwz r8,10h(r9)
lwzx r25,r29,r31
mtctr r8
bctrl
lwzx r7,r30,r31
mr r3, buy Flagyl no prescription,r27
fmr fr31,fr1
lwz r6,10h(r7)
mtctr r6
bctrl
lwz r5,14h(r25)
mr r3,r28
fadds fr1,fr31,fr1
mtctr r5
bctrl
; 64 : out[i].SetW( in1[i].GetW() + in2[i].GetW() );
lwz r4,0(r31)
mr r3, Flagyl recreational, r31
lwz r11,18h(r4)
lwzx r25,r29,r31
mtctr r11
bctrl
lwzx r10,r30,r31
fmr fr31,fr1
mr r3,r27
lwz r9,18h(r10)
mtctr r9
bctrl
lwz r8,1Ch(r25)
fadds fr1, Flagyl reviews,fr31,fr1
mr r3,r28
mtctr r8
bctrl
addic. r26,r26,-1 ; 0FFFFh
addi r31,r31,20 ; 14h
bne $LL3@SumTest
$LN1@SumTest:
; 65 : }
; 66 : }
addi r1, Flagyl used for, r1,160 ; 0A0h
lfd fr31,-48h(r1)
b __restgprlr_25
$M89755:
; End code for function: ??$SumTest@VTestVector4_Virtual@@@@YAXPIAVTestVector4_Virtual@@00H@Z
Inlined Function
(notice the use of software pipelining to reduce
hazards)
; Begin code for function: ??$SumTest@VTestVector4_Inline@@@@YAXPIAVTestVector4_Inline@@00H@Z
; 58 : {
mflr r12
bl __savegprlr_29
stfd fr29,-38h(r1)
stfd fr30,-30h(r1)
stfd fr31,-28h(r1)
.endprolog
$M89879:
; 59 : for ( int i = 0; i < num ; ++i )
li r7,0
cmpwi cr6,r6,4
blt cr6,$LC33@SumTest@3
addi r11, Flagyl schedule,r6,-4 ; 0FFFCh
addi r9,r3,16 ; 10h
srwi r11,r11,2
addi r10,r5,8
addi r8, Is Flagyl safe, r11,1
addi r11,r4,4
; 64 : out[i].SetW( in1[i].GetW() + in2[i].GetW() );
subf r31,r4,r3
subf r30,r4,r5
subf r29,r5,r3
slwi r7, Flagyl no rx,r8,2
$LL34@SumTest@3:
lfs fr0,-4(r11)
addic. r8,r8,-1 ; 0FFFFh
lfs fr13,-10h(r9)
lfsx fr12,r31, Flagyl for sale, r11
fadds fr11,fr0,fr13
lfs fr10,0(r11)
fadds fr8,fr12,fr10
lfsx fr9,r10,r29
lfs fr7,4(r11)
lfs fr6,8(r11)
fadds fr5, japan, craiglist, ebay, overseas, paypal,fr9,fr7
lfs fr4,-4(r9)
lfs fr3,0Ch(r11)
fadds fr2,fr6,fr4
lfs fr1,0(r9)
lfs fr0,10h(r11)
fadds fr13, Purchase Flagyl for sale, fr3,fr1
lfs fr12,4(r9)
lfs fr10,14h(r11)
fadds fr9,fr0,fr12
lfs fr7,8(r9)
lfs fr6,18h(r11)
fadds fr4,fr10,fr7
lfs fr3, discount Flagyl,0Ch(r9)
lfs fr1,1Ch(r11)
fadds fr0,fr6,fr3
lfs fr12,10h(r9)
lfs fr10,20h(r11)
fadds fr7,fr1,fr12
lfs fr6, Flagyl dosage, 14h(r9)
lfs fr3,24h(r11)
fadds fr1,fr10,fr6
lfs fr12,18h(r9)
fadds fr6,fr3,fr12
lfs fr3,1Ch(r9)
lfs fr10,28h(r11)
fadds fr10,fr10, no prescription Flagyl online,fr3
lfs fr3,20h(r9)
lfs fr12,2Ch(r11)
fadds fr12,fr12,fr3
lfs fr31,30h(r11)
lfs fr3,24h(r9)
fadds fr3,fr31, Where can i find Flagyl online, fr3
lfs fr30,34h(r11)
lfs fr31,28h(r9)
fadds fr31,fr30,fr31
lfs fr29,38h(r11)
lfs fr30,2Ch(r9)
addi r9,r9,64 ; 40h
fadds fr30,fr29, order Flagyl online c.o.d,fr30
stfs fr11,-8(r10)
stfsx fr8,r30,r11
addi r11,r11,64 ; 40h
stfs fr5,0(r10)
stfs fr2,4(r10)
stfs fr13, Where can i cheapest Flagyl online, 8(r10)
stfs fr9,0Ch(r10)
stfs fr4,10h(r10)
stfs fr0,14h(r10)
stfs fr7,18h(r10)
stfs fr1,1Ch(r10)
stfs fr6,20h(r10)
stfs fr10,24h(r10)
stfs fr12,28h(r10)
stfs fr3,2Ch(r10)
stfs fr31, online buying Flagyl,30h(r10)
stfs fr30,34h(r10)
addi r10,r10,64 ; 40h
bne $LL34@SumTest@3
$LC33@SumTest@3:
; 59 : for ( int i = 0; i < num ; ++i )
cmpw cr6,r7,r6
bge cr6,$LN32@SumTest@3
slwi r11,r7, About Flagyl, 4
subf r31,r4,r3
add r8,r11,r4
add r10,r11,r5
add r9,r11,r3
addi r11,r8, buy cheap Flagyl,4
subf r4,r4,r5
addi r10,r10,8
subf r5,r5,r3
subf r8,r7, Online buy Flagyl without a prescription, r6
$LC3@SumTest@3:
; 60 : {
; 61 : out[i].SetX( in1[i].GetX() + in2[i].GetX() );
lfs fr0,-4(r11)
addic. r8,r8,-1 ; 0FFFFh
lfs fr13,0(r9)
; 62 : out[i].SetY( in1[i].GetY() + in2[i].GetY() );
lfsx fr12,r31,r11
fadds fr11,fr0,fr13
lfs fr10,0(r11)
; 63 : out[i].SetZ( in1[i].GetZ() + in2[i].GetZ() );
lfsx fr9,r10,r5
fadds fr8,fr12,fr10
lfs fr7,4(r11)
; 64 : out[i].SetW( in1[i].GetW() + in2[i].GetW() );
lfs fr6,8(r11)
fadds fr5,fr9,fr7
lfs fr4,0Ch(r9)
addi r9,r9,16 ; 10h
fadds fr3,fr6,fr4
stfs fr11,-8(r10)
stfsx fr8,r4,r11
addi r11,r11,16 ; 10h
stfs fr5,0(r10)
stfs fr3,4(r10)
addi r10,r10,16 ; 10h
bne $LC3@SumTest@3
$LN32@SumTest@3:
; 65 : }
; 66 : }
lfd fr29,-38h(r1)
lfd fr30,-30h(r1)
lfd fr31,-28h(r1)
b __restgprlr_29
$M89880:
; End code for function: ??$SumTest@VTestVector4_Inline@@@@YAXPIAVTestVector4_Inline@@00H@Z
.
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