Linked Questions

With Visual Studio I can read the clock cycle count from the processor as shown below. How do I do the same thing with GCC? #ifdef _MSC_VER // Compiler: Microsoft Visual Studio #...

I have successfully written some inline assembler in gcc to rotate right one bit following some nice instructions: http://www.cs.dartmouth.edu/~sergey/cs108/2009/gcc-inline-asm.pdf Here's an example: ...

I'm new to C++ and benchmarking I don't understand what the this part of the code does? So I found something about the edx, eax registers, but I don't fully understand how that plays into the code. ...

I am trying to convert someone else's project from 32bit to 64bit. Everything seems to be OK except one function, which uses assembly expressions which are not supported in Visual Studio when building ...

Possible Duplicate: Getting cpu cycles using RDTSC - why does the value of RDTSC always increase? Get CPU cycle count? I want to write C++ code which analyzes sorting algorithms, and I need to ...

I'm writing code that creates trees and times different methods of creating trees. I can't seem to get rdtsc to function properly, though. Here's my code: #include <stdio.h> #include &...

I'm trying to figure out how to read this assembly code in C++. This is the code: unsigned __int64 high_perf_time; unsigned __int64 *dest = &high_perf_time; __asm { _emit 0xf // these ...

I'm trying to generate random numbers but with this seed int rdtsc() { __asm__ __volatile__("rdtsc"); } But when I try to compile I get this error: error C2065: '__asm__' : ...

I have written a very simple C program in an attempt to understand rdtsc in C (Linux).The program is given below. #include <stdio.h> static inline unsigned long long tick() { unsigned ...

So I'm trying compile some C in GCC for windows. Long story short I can't get Visual Studios to compile an EXE that works on XP. So I thought I'd give GCC a try. The code it's struggling with is: ...

My code is very simple: global start extern printf, Sleep section .data: string db 'End: %llu', 0Ah, 'Start: %llu', 0 section .text: start: mfence lfence rdtsc sub rsp, 8 ...

I am trying to call cpuid before my rdtsc function to prevent out of order. I initially used this rdtsc function to get 2 timestamps and often I get negative numbers, which is undesirable. This is the ...

i am not sure how a function that will read the Intelx86 Time stamp counter would look like. i'm trying to measure the performance of a single function so I assume that I would need 2 functions: 1 - ...

I'm a C++ student and I was assigned to measure the time of memory allocation of 1.000.000 integers, using CPUID and RDTSC instructions in inline assembly for G++ compiler. Here is the code I came up ...

What is the difference between using thet= __rdtsc() function directly and using asm __volatile__ ( "rdtsc \n" : "=a" (t)); I have seen on ...