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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
...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 have a true output dependency: output unmodified for...
Format timedelta to string
...
As you know, you can get the total_seconds from a timedelta object by accessing the .seconds attribute.
Python provides the builtin function divmod() which allows for:
s = 13420
hours, remainder = divmod(s, 3600)
minutes, seconds =...
Difference between std::system_clock and std::steady_clock?
...able 59 C1 and C2 denote clock types. t1 and t2 are values returned by C1::now() where the call returning t1 happens before the call returning t2 and both of these calls occur before C1::time_point::max(). [ Note: this means C1 did not wrap around between t1 and t2. —end note ]
Expression: ...
How to install the Raspberry Pi cross compiler on my Linux host machine?
...arm-linux-gnueabihf-raspbian/bin
to the end of the file named ~/.bashrc
Now you can either log out and log back in (i.e. restart your terminal session), or run . ~/.bashrc in your terminal to pick up the PATH addition in your current terminal session.
Now, verify that you can access the compiler...
Is there a way to create xxhdpi, xhdpi, hdpi, mdpi and ldpi drawables from a large scale image?
...time (downside: will only work on fairly recent devices, where -xxhdpi is known).
Option #2: Use Android Asset Studio to downsample them for you.
Option #3: Automate the process within a graphics editor, per ssantos' answer.
Option #4: Script yourself a solution, using something like ImageMagick.
Op...
Age from birthdate in python
...etime
import dateutil
def birthday(date):
# Get the current date
now = datetime.datetime.utcnow()
now = now.date()
# Get the difference between the current date and the birthday
age = dateutil.relativedelta.relativedelta(now, date)
age = age.years
return age
...
Should I use the datetime or timestamp data type in MySQL?
... future. If I say 1283351460 seconds since '1970-01-01 00:00:00 UTC', you know exactly what point in time I talk about. (See Nir's excellent answer below). [Downside: valid range].
– MattBianco
Sep 1 '10 at 14:36
...
Unique Constraint in Entity Framework Code First
...d compliant you should absolutely be able to enforce uniqueness this way. Now whether EF allows you to properly manage the transaction lifecycle this way is another question.
– mattmc3
May 1 '11 at 0:21
...
How to add minutes to my Date
...lang3.time package
int addMinuteTime = 5;
Date targetTime = new Date(); //now
targetTime = DateUtils.addMinutes(targetTime, addMinuteTime); //add minute
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How to make a promise from setTimeout
...ions for resolving/rejecting the promise as arguments.
First, since async now has a meaning in JavaScript (even though it's only a keyword in certain contexts), I'm going to use later as the name of the function to avoid confusion.
Basic Delay
Using native promises (or a faithful polyfill) it wou...