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Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?
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I'm not AMD or speaking for them, but I would have done it the same way. Because zeroing the high half doesn't create a dependency on the previous value, that the CPU would have to wait on. The register renaming mechanism would essential...
What does %w(array) mean?
I'm looking at the documentation for FileUtils.
8 Answers
8
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Reading a delimited string into an array in Bash
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In order to convert a string into an array, please use
arr=($line)
or
read -a arr <<< $line
It is crucial not to use quotes since this does the trick.
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Combine two columns of text in pandas dataframe
...tenate them directly:
df["period"] = df["Year"] + df["quarter"]
If one (or both) of the columns are not string typed, you should convert it (them) first,
df["period"] = df["Year"].astype(str) + df["quarter"]
Beware of NaNs when doing this!
If you need to join multiple string columns, you ca...
What is NSLayoutConstraint “UIView-Encapsulated-Layout-Height” and how should I go about forcing it
...g under iOS 8 and I'm using automatic cell heights from constraints in a storyboard.
17 Answers
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What is the difference between Python's list methods append and extend?
... What is the difference between extend and simply using the addition operator - in the above example, x = x + [4, 5]?
– Rohan
May 29 '17 at 22:10
315
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.NET obfuscation tools/strategy [closed]
My product has several components: ASP.NET, Windows Forms App and Windows Service. 95% or so of the code is written in VB.NET.
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How to execute an external program from within Node.js?
...gram from within node.js? Is there an equivalent to Python's os.system() or any library that adds this functionality?
4 A...
Do a “git export” (like “svn export”)?
I've been wondering whether there is a good "git export" solution that creates a copy of a tree without the .git repository directory. There are at least three methods I know of:
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How do I pass parameters to a jar file at the time of execution?
...dited Oct 13 '17 at 7:06
Paolo Forgia
5,50477 gold badges3535 silver badges5555 bronze badges
answered Jan 19 '09 at 6:27
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