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Re: Fun performance test on Win7/Win8 with C++, C#(3.5,4,4.5) and Math.Sqrt() as special guest

Super Lloyd10-Mar-12 4:54

Super Lloyd

10-Mar-12 4:54

It might be quite verbose.... let's just pick a few

TC++

ASM

Copy Code

__declspec(noinline) double fct(int i, int j)
{
01301000  push        ebp  
01301001  mov         ebp,esp  
	return sqrt((double)i);
01301003  fild        dword ptr [i]  
}
01301006  pop         ebp  
	return sqrt((double)i);
01301007  jmp         _CIsqrt (13019B0h)  
--- No source file -------------------------------------------------------------
0130100C  int         3  
0130100D  int         3  
0130100E  int         3  
0130100F  int         3  
--- c:\dev\test\perfdouble\pdouble\pdouble.cpp ---------------------------------

int primes(unsigned long n) {
01301010  push        ebp  
01301011  mov         ebp,esp  
01301013  sub         esp,8  
01301016  push        esi  
01301017  push        edi  
unsigned long i, j;
int countprimes = 0;
  for(i = 1; i <= n; i++) {
01301018  mov         edi,1  
0130101D  cmp         ebx,edi  
0130101F  jb          primes+55h (1301065h)  
      int isprime = 1;
	  float limit = sqrt((double)i);
      for(j = 2; j < fct(i, j); j++) 
01301021  push        edi  
01301022  mov         esi,2  
01301027  call        fct (1301000h)  
0130102C  fcom        qword ptr [__real@4000000000000000 (1302120h)]  
01301032  add         esp,4  
01301035  fnstsw      ax  
01301037  test        ah,41h  
0130103A  jne         primes+4Eh (130105Eh)  
          if(!(i%j)) {
0130103C  xor         edx,edx  
0130103E  mov         eax,edi  
01301040  div         eax,esi  
01301042  test        edx,edx  
01301044  je          primes+4Eh (130105Eh)  
      int isprime = 1;
	  float limit = sqrt((double)i);
      for(j = 2; j < fct(i, j); j++) 
01301046  inc         esi  
01301047  mov         dword ptr [ebp-4],esi  
0130104A  fild        dword ptr [ebp-4]  
0130104D  jns         primes+45h (1301055h)  
0130104F  fadd        qword ptr [__real@41f0000000000000 (1302118h)]  
01301055  fcomp       st(1)  
01301057  fnstsw      ax  
01301059  test        ah,5  
0130105C  jnp         primes+2Ch (130103Ch)  
unsigned long i, j;
int countprimes = 0;
  for(i = 1; i <= n; i++) {
0130105E  inc         edi  
      int isprime = 1;
	  float limit = sqrt((double)i);
      for(j = 2; j < fct(i, j); j++) 
0130105F  fstp        st(0)  
01301061  cmp         edi,ebx  
01301063  jbe         primes+11h (1301021h)  
        isprime = 0;
        break;
   }
    countprimes+= isprime;
  }
  throw "break here";
01301065  push        offset __TI2PAD (13022F8h)  
0130106A  lea         ecx,[ebp-4]  
0130106D  push        ecx  
0130106E  mov         dword ptr [ebp-4],offset string "break here" (130210Ch)  
01301075  call        _CxxThrowException (13019B6h)  
$LN23:
0130107A  int         3  
--- No source file -------------------------------------------------------------
0130107B  int         3  
0130107C  int         3  
0130107D  int         3  
0130107E  int         3  
0130107F  int         3  
--- c:\dev\test\perfdouble\pdouble\pdouble.cpp ---------------------------------
  return countprimes;
}

did the disassembly for the slow version (TC#1)

TC#1, .NET4, win7

ASM

Copy Code

00000000  push        ebp 
00000001  mov         ebp,esp 
00000003  push        edi 
00000004  push        esi 
00000005  sub         esp,0Ch 
00000008  mov         dword ptr [ebp-0Ch],ecx 
0000000b  mov         esi,1 
00000010  mov         eax,dword ptr [ebp-0Ch] 
00000013  cdq 
00000014  test        edx,edx 
00000016  jg          0000001F 
00000018  jl          0000007B 
0000001a  cmp         eax,1 
0000001d  jb          0000007B 
0000001f  mov         edi,1 
00000024  lea         ecx,[edi+1] 
00000027  jmp         00000038 
00000029  mov         eax,esi 
0000002b  xor         edx,edx 
0000002d  div         eax,ecx 
0000002f  test        edx,edx 
00000031  jne         00000037 
00000033  xor         edi,edi 
00000035  jmp         00000062 
00000037  inc         ecx 
00000038  xor         eax,eax 
0000003a  mov         dword ptr [ebp-14h],esi 
0000003d  mov         dword ptr [ebp-10h],eax 
00000040  fild        qword ptr [ebp-14h] 
00000043  fstp        qword ptr [ebp-14h] 
00000046  fld         qword ptr [ebp-14h] 
00000049  fsqrt 
0000004b  mov         dword ptr [ebp-14h],ecx 
0000004e  mov         dword ptr [ebp-10h],eax 
00000051  fild        qword ptr [ebp-14h] 
00000054  fstp        qword ptr [ebp-14h] 
00000057  fld         qword ptr [ebp-14h] 
0000005a  fcomip      st,st(1) 
0000005c  fstp        st(0) 
0000005e  jp          00000062 
00000060  jbe         00000029 
00000062  test        edi,edi 
00000064  je          00000066 
00000066  inc         esi 
00000067  xor         eax,eax 
00000069  mov         edx,dword ptr [ebp-0Ch] 
0000006c  mov         ecx,edx 
0000006e  sar         ecx,1Fh 
00000071  cmp         eax,ecx 
00000073  jg          0000007B 
00000075  jl          0000001F 
00000077  cmp         esi,edx 
00000079  jbe         0000001F 
0000007b  mov         ecx,60BDFC48h 
00000080  call        FFEB1E10 
00000085  mov         esi,eax 
00000087  mov         edx,182EA4h 
0000008c  mov         ecx,70000001h 
00000091  call        61524745 
00000096  mov         edx,eax 
00000098  mov         ecx,esi 
0000009a  call        60E023E0 
0000009f  mov         ecx,esi 
000000a1  call        61521086 
000000a6  int         3

TC#1, .NET3.5, win7

ASM

Copy Code

00000000  push        ebp 
00000001  mov         ebp,esp 
00000003  push        edi 
00000004  push        esi 
00000005  sub         esp,0Ch 
00000008  mov         dword ptr [ebp-0Ch],ecx 
0000000b  mov         esi,1 
00000010  mov         eax,dword ptr [ebp-0Ch] 
00000013  cdq 
00000014  test        edx,edx 
00000016  jg          0000001F 
00000018  jl          0000007B 
0000001a  cmp         eax,1 
0000001d  jb          0000007B 
0000001f  mov         edi,1 
00000024  lea         ecx,[edi+1] 
00000027  jmp         00000038 
00000029  mov         eax,esi 
0000002b  xor         edx,edx 
0000002d  div         eax,ecx 
0000002f  test        edx,edx 
00000031  jne         00000037 
00000033  xor         edi,edi 
00000035  jmp         00000062 
00000037  inc         ecx 
00000038  xor         eax,eax 
0000003a  mov         dword ptr [ebp-14h],esi 
0000003d  mov         dword ptr [ebp-10h],eax 
00000040  fild        qword ptr [ebp-14h] 
00000043  fstp        qword ptr [ebp-14h] 
00000046  fld         qword ptr [ebp-14h] 
00000049  fsqrt 
0000004b  mov         dword ptr [ebp-14h],ecx 
0000004e  mov         dword ptr [ebp-10h],eax 
00000051  fild        qword ptr [ebp-14h] 
00000054  fstp        qword ptr [ebp-14h] 
00000057  fld         qword ptr [ebp-14h] 
0000005a  fcomip      st,st(1) 
0000005c  fstp        st(0) 
0000005e  jp          00000062 
00000060  jbe         00000029 
00000062  test        edi,edi 
00000064  je          00000066 
00000066  inc         esi 
00000067  xor         eax,eax 
00000069  mov         edx,dword ptr [ebp-0Ch] 
0000006c  mov         ecx,edx 
0000006e  sar         ecx,1Fh 
00000071  cmp         eax,ecx 
00000073  jg          0000007B 
00000075  jl          0000001F 
00000077  cmp         esi,edx 
00000079  jbe         0000001F 
0000007b  mov         ecx,66CA0D04h 
00000080  call        FFE41E4C 
00000085  mov         esi,eax 
00000087  mov         edx,292F2Ch 
0000008c  mov         ecx,70000001h 
00000091  call        671A9052 
00000096  mov         edx,eax 
00000098  mov         ecx,esi 
0000009a  call        6681A7A0 
0000009f  mov         ecx,esi 
000000a1  call        671A9187 
000000a6  int         3

TC1, .NET4, win8

ASM

Copy Code

00000000  push        rbx 
00000001  push        rdi 
00000002  sub         rsp,28h 
00000006  movsxd      r8,ecx 
00000009  cmp         r8,1 
0000000d  jl          0000000000000080 
0000000f  mov         ecx,1 
00000014  nop         word ptr [rax+rax+00000000h] 
00000020  mov         eax,ecx 
00000022  cvtsi2sd    xmm0,rax 
00000027  mov         eax,2 
0000002c  mov         eax,eax 
0000002e  cvtsi2sd    xmm1,rax 
00000033  sqrtsd      xmm0,xmm0 
00000037  ucomisd     xmm0,xmm1 
0000003b  jb          000000000000006A 
0000003d  mov         r9d,2 
00000043  xor         edx,edx 
00000045  mov         eax,ecx 
00000047  div         eax,r9d 
0000004a  test        edx,edx 
0000004c  je          000000000000006A 
0000004e  inc         r9d 
00000051  mov         eax,r9d 
00000054  cvtsi2sd    xmm2,rax 
00000059  mov         eax,ecx 
0000005b  cvtsi2sd    xmm0,rax 
00000060  sqrtsd      xmm1,xmm0 
00000064  ucomisd     xmm1,xmm2 
00000068  jae         0000000000000043 
0000006a  inc         ecx 
0000006c  mov         eax,ecx 
0000006e  cmp         rax,r8 
00000071  jle         0000000000000020 
00000073  jmp         0000000000000080 
00000075  add         rsp,28h 
00000079  pop         rdi 
0000007a  pop         rbx 
0000007b  ret 
0000007c  nop         dword ptr [rax] 
00000080  lea         rdx,[FFEE2D70h] 
00000087  mov         ecx,70000001h 
0000008c  call        000000005F7A0A70 
00000091  mov         rbx,rax 
00000094  lea         rcx,[5E8109F0h] 
0000009b  call        000000005F682310 
000000a0  mov         rdi,rax 
000000a3  mov         rdx,rbx 
000000a6  mov         rcx,rdi 
000000a9  call        000000005ED99BC0 
000000ae  mov         rcx,rdi 
000000b1  call        000000005F79EF24 
000000b6  nop

A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station....
_________________________________________________________
My programs never have bugs, they just develop random features.

Re: Fun performance test on Win7/Win8 with C++, C#(3.5,4,4.5) and Math.Sqrt() as special guest

harold aptroot10-Mar-12 5:02

harold aptroot

10-Mar-12 5:02

Well there's your problem - it's running in 64bit mode on win8 and in 32bit mode on win7. I wouldn't have expected a difference this large, but you're not exactly comparing apples to apples here..

Re: Fun performance test on Win7/Win8 with C++, C#(3.5,4,4.5) and Math.Sqrt() as special guest

Super Lloyd10-Mar-12 5:09

Super Lloyd

10-Mar-12 5:09

Damn, how did that happen??!?
Sh*t!

Well the only conclusion C# is good ^_^, .NET4.5 is not optimized, C++ optimizer is way better

Re: Fun performance test on Win7/Win8 with C++, C#(3.5,4,4.5) and Math.Sqrt() as special guest

Super Lloyd10-Mar-12 5:00

Super Lloyd

10-Mar-12 5:00

Indeed, compiler tricked with your suggestion! (gosh, I need to practice assembly! :P)
Time: 1011 ms

(I'll copy the C++ dissassembly soon, just realized it doesn't display properly.. :/)

Re: Fun performance test on Win7/Win8 with C++, C#(3.5,4,4.5) and Math.Sqrt() as special guest

#realJSOP10-Mar-12 5:52

#realJSOP

10-Mar-12 5:52

The real result here is that unmanaged C++ will always be consistently the same speed (and generally faster) than .net. Smile | :)

".45 ACP - because shooting twice is just silly" - JSOP, 2010
-----
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass." - Dale Earnhardt, 1997

Re: Fun performance test on Win7/Win8 with C++, C#(3.5,4,4.5) and Math.Sqrt() as special guest

Super Lloyd10-Mar-12 13:16

Super Lloyd

10-Mar-12 13:16

This result is nothing new! Wink | ;)

The C# argument was NOT "hey, it's faster than C++" but "hey, it might be a little slower than C++ but it's much easier to program"

Interestingly, in this program, I can see C++ optimizer is much more betterrer (automatically remove multiple call to sqrt with same parameter) and this simple optimization has huge impact.

Interestingly too I can see C# perf is just as good if I spot the optimization myself! :P

But fear not, I just did that[^], and now I'm going to do that[^]! :P

Re: Fun performance test on Win7/Win8 with C++, C#(3.5,4,4.5) and Math.Sqrt() as special guest

NormDroid10-Mar-12 6:35

NormDroid

10-Mar-12 6:35

Dissamble System and peek at the Math class in both version to see if there's any difference, my guesss is it just p/invokes out to the same function in both cases.

Software Kinetics Wear a hard hat it's under construction

Metro RSS

Re: Fun performance test on Win7/Win8 with C++, C#(3.5,4,4.5) and Math.Sqrt() as special guest

harold aptroot10-Mar-12 6:42

harold aptroot

10-Mar-12 6:42

Math.Sqrt is actually treated like an intrinsic function in every version of the CLR I've ever seen. It compiles to FSQRT on 32bit targets and SQRTSD on 64bit targets. It never uses SQRTSS.

Backwards flying space shuttle...

Sander Rossel10-Mar-12 0:27

Sander Rossel

10-Mar-12 0:27

And did I mention it's from lego?[^] Roll eyes | :rolleyes:

Full story: 2001: A Brick Odyssey[^]

It's an OO world.

Copy Code

public class Naerling : Lazy<Person>{
    public void DoWork(){ throw new NotImplementedException(); }
}

Re: Backwards flying space shuttle...

Nelek10-Mar-12 1:13

Nelek

10-Mar-12 1:13

Luckily the shuttle did not found a crazy !"§$%&" bird, that popped the ballon.

Nice video

Regards.
--------
M.D.V. Wink | ;)

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpfull answers is nice, but saying thanks can be even nicer.

It's official: the end of the world is tomorrow.

Septimus Hedgehog9-Mar-12 22:39

Septimus Hedgehog

9-Mar-12 22:39

First, we had that little matter of the solar flares this week. This morning, Auntie BBC had an interview with an astronomer who was waxing lyrical about the alignment of some planets which'll be visible in the UK. Apparently, Mars, Saturn and Jupiter all come into view at the same time. I think it's time to sell my 5000 Apple shares and give the proceeds to the Jim Jones foundation.

Mark my words, if Italy beat Wales today and England (choke) beat France in the Six Nations rugby then we are truly doomed. If anyone asks, it were aliens 'cos I seen 'em. Sniff | :^)

Re: It's official: the end of the world is tomorrow.

Richard MacCutchan9-Mar-12 22:40

Richard MacCutchan

9-Mar-12 22:40

PHS241 wrote:
England (choke) beat France

That's what I want to see.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Re: It's official: the end of the world is tomorrow.

User 592419-Mar-12 23:00

User 59241

9-Mar-12 23:00

Damn - I just bought some green bananas - what a waste.

Peter Wasser

Art is making something out of nothing and selling it.
Frank Zappa

Re: It's official: the end of the world is tomorrow.

Dalek Dave9-Mar-12 23:11

Dalek Dave

9-Mar-12 23:11

I remember about 10 years ago when a chum of mine pointed out Mars, Jupiter, Saturn, Mercury and Venus and said it was the first time in years when one could see 5 planets.

I replied "Look Down".

---------------------------------
I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave

CCC Link[^]

English League Tables - Live

Re: It's official: the end of the world is tomorrow.

chriselst9-Mar-12 23:26

chriselst

9-Mar-12 23:26

It'd be ironic if it did end now that American preacher nutter has finally admitted it isn't going to.

Every man can tell how many goats or sheep he possesses, but not how many friends.

Re: It's official: the end of the world is tomorrow.

Super Lloyd9-Mar-12 23:53

Super Lloyd

9-Mar-12 23:53

Tomorrow? do you meant tomorrow in England or tomorrow in Australia?
You know, with the time difference I might miss this crucial moment!!!!

Re: It's official: the end of the world is tomorrow.

User 5924110-Mar-12 0:14

User 59241

10-Mar-12 0:14

Interesting - I guess Kiribati is the first to know whether a dire prediction is true or not. Someone there could perhaps email the rest of us.

Peter Wasser

Art is making something out of nothing and selling it.
Frank Zappa

Re: It's official: the end of the world is tomorrow.

OriginalGriff10-Mar-12 0:27

OriginalGriff

10-Mar-12 0:27

Not if it's true...

Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water

Re: It's official: the end of the world is tomorrow.

OriginalGriff10-Mar-12 0:28

OriginalGriff

10-Mar-12 0:28

It's ok, the Apocalypse is always organised to follow midnight round the world, ensuring that everyone gets a fair go at being destroyed! Laugh | :laugh:

Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water

Woohoo!

kid sister10-Mar-12 0:13

kid sister

10-Mar-12 0:13

I don't need to finish my homework Jig | [Dance]

xoxo

Kid sister Rose | [Rose]

There's no place like Lounge - Me

Re: Woohoo!

OriginalGriff10-Mar-12 0:30

OriginalGriff

10-Mar-12 0:30

I would if I was you - procrastination is a sin, and could mean you get big trouble if the apocalypse does happen... Laugh | :laugh:

Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water

Re: Woohoo!

Sander Rossel10-Mar-12 2:02

Sander Rossel

10-Mar-12 2:02

I'm doomed... Although is it still procrastination if I didn't plan on doing my homework in the first place? Smile | :)

It's an OO world.

Copy Code

public class Naerling : Lazy<Person>{
    public void DoWork(){ throw new NotImplementedException(); }
}

Re: Woohoo!

Nelek10-Mar-12 1:08

Nelek

10-Mar-12 1:08

This is what I call... see the glass (half) full. Laugh | :laugh:

Regards.
--------
M.D.V. Wink | ;)

Twitter could actually be useful

Abhinav S9-Mar-12 19:27

Abhinav S

9-Mar-12 19:27

Tweet-a-Beer - Clickety[^].

Re: Twitter could actually be useful

Ravi Sant11-Mar-12 20:52

Ravi Sant

11-Mar-12 20:52

In case, I just need your tweet password, if you just have this app working Laugh | :laugh:

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