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QuestionVisual Studio C++ compiler empty functions Pin
severin025-Mar-15 10:28
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QuestionUnable to get WTS_SESSION_LOGON event notification. How to capture the event when user log on to the machine.? Pin
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QuestionIs there a way to accelerate the following algorithm for hamming distance calculation? By assembly language? Pin
prime_tang23-Mar-15 23:37
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AnswerRe: Is there a way to accelerate the following algorithm for hamming distance calculation? By assembly language? Pin
Richard MacCutchan24-Mar-15 3:40
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AnswerRe: Is there a way to accelerate the following algorithm for hamming distance calculation? By assembly language? Pin
Jochen Arndt24-Mar-15 4:14
mveJochen Arndt24-Mar-15 4:14 
I don't see much optimisation options.
You are already using a lookup table and the code should not consume much time when dim is small. Rewriting it in assembler will be probably not faster because modern compilers will generate effective code (you may tell your compiler to generate an assembly output to check this).

When the code should be always executed on modern x86 CPUs, you may replace the popcount lookup with the __popcnt x86 instruction. For MS compilers see https://msdn.microsoft.com/library/bb385231.aspx[^].

[EDIT]
When using the popcnt instruction and your data are always a multiple of 2 or 4 (or 8 with 64-bit builds), you can reduce the number of loop executions by performing the operation with 16/32/64 bits.
AnswerRe: Is there a way to accelerate the following algorithm for hamming distance calculation? By assembly language? Pin
Chris Losinger24-Mar-15 9:06
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QuestionLink Error Which .lib to include Pin
ForNow21-Mar-15 19:28
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QuestionMALLOC FUNCTION IMPLEMENTATION Pin
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QuestionHow to use MFC to design an app that can connect 2 types of database Pin
DHLao19-Mar-15 17:36
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