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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
...the instruction only writes to it, the instruction will wait until dest is ready before executing. This false dependency is (now) documented by Intel as erratum HSD146 (Haswell) and SKL029 (Skylake)
Skylake fixed this for lzcnt and tzcnt.
Cannon Lake (and Ice Lake) fixed this for popcnt.
bsf/bsr h...
What's the opposite of head? I want all but the first N lines of a file
Given a text file of unknown length, how can I read, for example all but the first 2 lines of the file? I know tail will give me the last N lines, but I don't know what N is ahead of time.
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Fast Bitmap Blur For Android SDK
...y get on Android. Google claims to be "typically 2-3x faster than a multithreaded C implementation and often 10x+ faster than a Java implementation". Renderscript is really sophisticated (using the fastest processing device (GPU, ISP, etc.), etc.) and there is also the v8 support library for it maki...
Find the similarity metric between two strings
...s). It's a convenience function that may be what you are looking for, AKA read the docs! In my particular application I was doing some basic error checking / reporting to the user providing bad input, and this answer allows me to report to them the potential matches and what the "similarity" was. ...
How to apply a patch generated with git format-patch?
...at the commit messages contain a “Signed-off-by” tag. This tag will be read by Github and others to provide useful info about how the commit ended up in the code.
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Change Tomcat Server's timeout in Eclipse
...ations it is useful to know where this setting is 'really' stored.
Tomcat reads this setting from the element in the element in the servers.xml file. This file is stored in the .metatdata/.plugins/org.eclipse.wst.server.core
directory of your eclipse workspace, ie:
//.metadata/.plugins/org.ecl...
Disable, but not uninstall Resharper 4.x onwards
...eSharper\v4.0\Bin\Product.VisualStudio.90.AddIn
Because these files were read-only, VS200x was unable to modify them to set the startup enabledness of the Resharper addin.
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How to round up a number in Javascript?
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@Krtek ooops, Thanks for catching that. I mis-read the question. Answer updated.
– Shad
Mar 4 '11 at 7:59
2
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Is it good practice to make the constructor throw an exception? [duplicate]
..., and if the caller chooses to propagate the Exception, the problem just spreads.
1 - Some people may disagree, but IMO there is no substantive difference between this case and the case of throwing exceptions in methods. The standard checked vs unchecked advice applies equally to both cases.
2 ...
Java int to String - Integer.toString(i) vs new Integer(i).toString()
...lls
Integer.toString(i)
Thus, use String.valueOf(i) if you like how it reads and you don't need radix, but also knowing that it is less efficient than Integer.toString(i).
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