Timings for some interesting instructions

[jj2007]

Code: [Select]

Intel(R) Core(TM) i5-2450M CPU @ 2.50GHz
+287     Cycles for fsave+frstor
+84      Cycles for cpuid
+22      Cycles for rdtsc
+14      Cycles for pushad+popad
+2       Cycles for swap with 2*push+pop
+1       Cycles for swap with xchg eax,edx
+8       Cycles for enter 100+leave
+2       Cycles for push ebp+sub esp,100+leave

+287     Cycles for fsave+frstor
+84      Cycles for cpuid
+21      Cycles for rdtsc
+14      Cycles for pushad+popad
+2       Cycles for swap with 2*push+pop
+1       Cycles for swap with xchg eax,edx
+8       Cycles for enter 100+leave
+2       Cycles for push ebp+sub esp,100+leave

+297     Cycles for fsave+frstor
+84      Cycles for cpuid
+21      Cycles for rdtsc
+14      Cycles for pushad+popad
+2       Cycles for swap with 2*push+pop
+1       Cycles for swap with xchg eax,edx
+8       Cycles for enter 100+leave
+2       Cycles for push ebp+sub esp,100+leave

+289     Cycles for fsave+frstor
+85      Cycles for cpuid
+22      Cycles for rdtsc
+14      Cycles for pushad+popad
+3       Cycles for swap with 2*push+pop
+1       Cycles for swap with xchg eax,edx
+8       Cycles for enter 100+leave
+2       Cycles for push ebp+sub esp,100+leave

[HSE]

JJ,

I can say, with some confidence, that your system don't work here 

Code: [Select]

Intel(R) Core(TM) i3-10100 CPU @ 3.60GHz
303      Cycles for fsave+frstor
1535     Cycles for cpuid
-22      Cycles for rdtsc
-32      Cycles for pushad+popad
-38      Cycles for swap with 2*push+pop
-40      Cycles for swap with xchg eax,edx
-37      Cycles for enter 100+leave
-39      Cycles for push ebp+sub esp,100+leave

277      Cycles for fsave+frstor
1556     Cycles for cpuid
-22      Cycles for rdtsc
-32      Cycles for pushad+popad
-38      Cycles for swap with 2*push+pop
-40      Cycles for swap with xchg eax,edx
-37      Cycles for enter 100+leave
-38      Cycles for push ebp+sub esp,100+leave

277      Cycles for fsave+frstor
1538     Cycles for cpuid
-22      Cycles for rdtsc
-32      Cycles for pushad+popad
-38      Cycles for swap with 2*push+pop
-20      Cycles for swap with xchg eax,edx
-36      Cycles for enter 100+leave
-39      Cycles for push ebp+sub esp,100+leave

302      Cycles for fsave+frstor
1536     Cycles for cpuid
-22      Cycles for rdtsc
-32      Cycles for pushad+popad
8        Cycles for swap with 2*push+pop
39       Cycles for swap with xchg eax,edx
11       Cycles for enter 100+leave
-19      Cycles for push ebp+sub esp,100+leave

hit any key

[jj2007]

Interesting, HSE, thanks

So I fired up my Athlon... not overwhelming, but it looks ok. Did you run the test several times with such results? Every now and then I see negative values, which means that the empty calibration loop took longer than expected, but that's actually not so common

Code: [Select]

AMD Athlon Gold 3150U with Radeon Graphics
256      Cycles for fsave+frstor
101      Cycles for cpuid
24       Cycles for rdtsc
8        Cycles for pushad+popad
2        Cycles for swap with 2*push+pop
-1       Cycles for swap with xchg eax,edx
13       Cycles for enter 100+leave
2        Cycles for push ebp+sub esp,100+leave

247      Cycles for fsave+frstor
99       Cycles for cpuid
24       Cycles for rdtsc
8        Cycles for pushad+popad
2        Cycles for swap with 2*push+pop
-1       Cycles for swap with xchg eax,edx
13       Cycles for enter 100+leave
2        Cycles for push ebp+sub esp,100+leave

243      Cycles for fsave+frstor
100      Cycles for cpuid
23       Cycles for rdtsc
8        Cycles for pushad+popad
2        Cycles for swap with 2*push+pop
0        Cycles for swap with xchg eax,edx
16       Cycles for enter 100+leave
2        Cycles for push ebp+sub esp,100+leave

254      Cycles for fsave+frstor
102      Cycles for cpuid
24       Cycles for rdtsc
7        Cycles for pushad+popad
2        Cycles for swap with 2*push+pop
-1       Cycles for swap with xchg eax,edx
14       Cycles for enter 100+leave
2        Cycles for push ebp+sub esp,100+leave

[HSE]

 

Code: [Select]

Intel(R) Core(TM) i3-10100 CPU @ 3.60GHz
299      Cycles for fsave+frstor
88       Cycles for cpuid
19       Cycles for rdtsc
12       Cycles for pushad+popad
1        Cycles for swap with 2*push+pop
0        Cycles for swap with xchg eax,edx
7        Cycles for enter 100+leave
1        Cycles for push ebp+sub esp,100+leave

298      Cycles for fsave+frstor
88       Cycles for cpuid
19       Cycles for rdtsc
12       Cycles for pushad+popad
1        Cycles for swap with 2*push+pop
3        Cycles for swap with xchg eax,edx
7        Cycles for enter 100+leave
1        Cycles for push ebp+sub esp,100+leave

299      Cycles for fsave+frstor
88       Cycles for cpuid
19       Cycles for rdtsc
12       Cycles for pushad+popad
1        Cycles for swap with 2*push+pop
0        Cycles for swap with xchg eax,edx
7        Cycles for enter 100+leave
1        Cycles for push ebp+sub esp,100+leave

299      Cycles for fsave+frstor
88       Cycles for cpuid
19       Cycles for rdtsc
15       Cycles for pushad+popad
1        Cycles for swap with 2*push+pop
0        Cycles for swap with xchg eax,edx
7        Cycles for enter 100+leave
1        Cycles for push ebp+sub esp,100+leave

hit any key
Very strange. There is a problem only first time 

[daydreamer]

Code: [Select]

Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz
358      Cycles for fsave+frstor
107      Cycles for cpuid
17       Cycles for rdtsc
12       Cycles for pushad+popad
-1       Cycles for swap with 2*push+pop
-2       Cycles for swap with xchg eax,edx
8        Cycles for enter 100+leave
-1       Cycles for push ebp+sub esp,100+leave

359      Cycles for fsave+frstor
105      Cycles for cpuid
18       Cycles for rdtsc
11       Cycles for pushad+popad
0        Cycles for swap with 2*push+pop
0        Cycles for swap with xchg eax,edx
9        Cycles for enter 100+leave
0        Cycles for push ebp+sub esp,100+leave

319      Cycles for fsave+frstor
110      Cycles for cpuid
17       Cycles for rdtsc
10       Cycles for pushad+popad
-1       Cycles for swap with 2*push+pop
-2       Cycles for swap with xchg eax,edx
5        Cycles for enter 100+leave
-1       Cycles for push ebp+sub esp,100+leave

356      Cycles for fsave+frstor
104      Cycles for cpuid
18       Cycles for rdtsc
11       Cycles for pushad+popad
-1       Cycles for swap with 2*push+pop
-1       Cycles for swap with xchg eax,edx
5        Cycles for enter 100+leave
-1       Cycles for push ebp+sub esp,100+leave

hit any key-1  ,seem my cpu is equipped with a flux capacitor 

[quarantined]

I can say, with some confidence, that your system don't work here 

Code: [Select]

Intel(R) Core(TM) i3-10100 CPU @ 3.60GHz
…
-22      Cycles for rdtsc
-32      Cycles for pushad+popad
-38      Cycles for swap with 2*push+pop
-40      Cycles for swap with xchg eax,edx
-37      Cycles for enter 100+leave
-38      Cycles for push ebp+sub esp,100+leave
…


Congratulations! Seems you have transcended space and time. Reverse time travel has been achieved…
Might want to tune up the flux capacitor though, in order to ‘fix’ the entries in the positive domain.

[jj2007]

Congratulations! Seems you have transcended space and time. Reverse time travel has been achieved…
Might want to tune up the flux capacitor though, in order to ‘fix’ the entries in the positive domain.

Thanks for the congrats

I am eager to see your solution. Post your code, I want to test it

[hutch--]

Over time I have seen a lot of well written code undertaking the same timing task but they all run into the same problem, how the OS interacts with the CPU and board hardware.

With ring 3 access you are down the line from the OS which takes over whenever it needs to and the variables of different CPUs with instruction ques, cache lag and a whole host of other variables, a timing that may work OK on one CPU/board will not necessarily do the same on another.

[quarantined]

Thanks for the congrats

I am eager to see your solution. Post your code, I want to test it

The congrats was for HSE, who I have replied to. Apparently his machine is ready for the past, present and future. No code available here as I have not achieved time travel as of yet.   

[HSE]

The congrats was for HSE, who I have replied to. Apparently his machine is ready for the past, present and future.

Oh! yes. It's a quantic state-machine. It's in past, present and future at same time. More important yet, running my code, you never know if it's working, or not!!!   

[hutch--]

 

> It's in past, present and future at same time.

David Hume, an English philosopher who referred to the above as "The uniformity of nature over time".

Bertrand Russell responded a few hundred years later with the example of the goose that was well fed and treated well all year but was killed and eaten at Christmas time. 

[HSE]

  Time is easy in comparation with some... source code!

I have made a search, and look like no philosopher has tackled the "indetermination in source code". 

[hutch--]

 

I take your point, the meaning of life, the meaning of truth etc ... all pale in comparison to some of the code I have seen over time. 

[daydreamer]

  Time is easy in comparation with some... source code!

I have made a search, and look like no philosopher has tackled the "indetermination in source code". 

well might be time for to write some philosophy
what I read years ago was only joke about "-its not a bug,its a feature" 
my thought is HLL's none-line number is an illusion,when running it in debugger it looks like its line numbered(memory adresses)

[InfiniteLoop]

Windows Defender thinks the .exe is a "severe" threat and has quarantined it. Without any source code who knows.
Trojan:Script/Wacatac.B!ml

254      Cycles for fsave+frstor
90       Cycles for cpuid
16       Cycles for rdtsc
9        Cycles for pushad+popad
-1       Cycles for swap with 2*push+pop
-1       Cycles for swap with xchg eax,edx
5        Cycles for enter 100+leave
1        Cycles for push ebp+sub esp,100+leave