61
votes
10
answers
676
views
How to view the assembly behind the code using Visual C++?
I was reading another question pertaining the efficiency of two lines of code, and the OP said that he looked
59
votes
14
answers
2K
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How can I see the assembly code for a C++ program?
How can I see the assembly code for a C++ program? What are the popular tools to do this?
66
votes
13
answers
1.7K
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Can num++ be atomic for 'int num'?
In general, for int num, num++ (or ++num), as a read-modify-write operation, is not atomic. But I often see co
64
votes
21
answers
376
views
Is inline assembly language slower than native C++ code?
I tried to compare the performance of inline assembly language and C++ code, so I wrote a function that add tw
66
votes
24
answers
1.4K
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Protecting executable from reverse engineering?
I've been contemplating how to protect my C/C++ code from disassembly and reverse engineering. Normally
55
votes
17
answers
1.5K
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How do you get assembler output from C/C++ source in gcc?
How does one do this? If I want to analyze how something is getting compiled, how would I get the emitted ass
52
votes
4
answers
660
views
How do I achieve the theoretical maximum of 4 FLOPs per cycle?
How can the theoretical peak performance of 4 floating point operations (double precision) per cycle be achiev
58
votes
11
answers
1.9K
views
Why does C++ code for testing the Collatz conjecture run faster than hand-written assembly?
I wrote these two solutions for Project Euler Q14, in assembly and in C++. They implement identical brute forc
64
votes
11
answers
1.9K
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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_u64 on Intel CPUs
I was looking for the fastest way to popcount large arrays of data. I encountered a very weird effect: Changin
62
votes
14
answers
655
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Is < faster than <=?
Is if (a < 901) faster than if (a <= 900)? Not exactly as in this simple example, but there are slight p
62
votes
11
answers
1.3K
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Fast ceiling of an integer division in C / C++
Given integer values x and y, C and C++ both return as the quotient q = x/y the floor of the floating point eq
58
votes
7
answers
1.9K
views
Fastest way to determine if an integer is between two integers (inclusive) with known sets of values
Is there a faster way than x >= start && x <= end in C or C++ to test if an integer is between t
51
votes
21
answers
732
views
Is there a standard sign function (signum, sgn) in C/C++?
I want a function that returns -1 for negative numbers and +1 for positive numbers. http://en.wikipedia.org/wi
59
votes
20
answers
1.3K
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How can I profile C++ code running on Linux?
I have a C++ application, running on Linux, which I'm in the process of optimizing. How can I pinpoint wh
54
votes
7
answers
1.3K
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LNK2038: mismatch detected for 'RuntimeLibrary': value 'MT_StaticRelease' doesn't match value 'MD_DynamicRelease' in file.obj
I am Integrating Matlab, C and Cuda together in a project. I used Matlab mix in order to connect matlab mx fun
58
votes
8
answers
1.9K
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Why do C++ libraries and frameworks never use smart pointers?
I read in a few articles that raw pointers should almost never be used. Instead they should always be wrapped
60
votes
6
answers
2.1K
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Why is std::map implemented as a red-black tree?
Why is std::map implemented as a red-black tree? There are several balanced binary search trees (BSTs) out th
55
votes
14
answers
803
views
Why does the C++ STL not provide any "tree" containers?
Why does the C++ STL not provide any "tree" containers, and what's the best thing to use instead? I want
63
votes
27
answers
2.9K
views
Why is processing a sorted array faster than processing an unsorted array?
Here is a piece of C++ code that shows some very peculiar behavior. For some strange reason, sorting the data
