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Performance optimization strategies of last resort [closed]
... clear on a load op. Find places where floats, vectors, and ints are being cast to one another and eliminate them. Use __restrict liberally to promise the compiler about aliasing.
Microcoded operations. Most processors have some operations that cannot be pipelined, but instead run a tiny subroutine ...
What are rvalues, lvalues, xvalues, glvalues, and prvalues?
...be moved from
im: has identity and can be moved from (e.g. the result of casting an lvalue to a rvalue reference)
Im: does not have identity and can be moved from.
The fourth possibility, IM, (doesn’t have identity and cannot be moved) is not
useful in C++ (or, I think) in any other l...
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
... blame the compiler for it's complacency though. While gcc does have a -Wcast-align option, it isn't enabled by default nor with -Wall or -Wextra. This is apparently due to gcc developers considering this type of code to be a brain-dead "abomination" unworthy of addressing -- understandable disda...
Java 8: Lambda-Streams, Filter by Method with Exception
...n method.get();
} catch (AdapterException e) {
throw x.cast(e.getCause());
}
}
@Override
public <A, R> R collect(Collector<T, A, R> collector) throws X {
return unmaskException(() -> delegate.collect(collector));
}
}
Then you coul...
How to get first and last day of previous month (with timestamp) in SQL Server
...
Not thinking CONVERT is the best solution if CAST is available
– Kennah
Jun 28 '19 at 19:29
...
What are bitwise shift (bit-shift) operators and how do they work?
...
Isn't it easier to cast your original, say 32bit cl_uint, as something like cl_uchar4 and access the byte you want directly as *.s2?
– David H Parry
Oct 13 '19 at 18:12
...
What's invokedynamic and how do I use it?
...e types of values supplied to its operations (e.g. Java)
Weak - converts (casts) arguments of an operation if those arguments have incompatible types (e.g. Visual Basic)
Knowing that Java is a Statically and Weakly typed, how do you implement Dynamically and Strongly typed languages on the JVM?
T...
Java's Virtual Machine and CLR
... uses the same implementation as a List<Object>, with different type-casts at the API boundaries), but each value-type uses its own unique implementation (List<int> generates completely different code from List<double>).
In Java, generic types are a purely a compiler trick. The JV...
Why is auto_ptr being deprecated?
...rted by unqiue_ptr
move assignment (1)
assign null pointer (2)
type-cast assignment (3)
copy assignment (deleted!) (4)
From : http://www.cplusplus.com/reference/memory/auto_ptr/operator=/
Kind of assignments supported by auto_ptr
copy assignment (4) culprit
Now coming to th...
OPTION (RECOMPILE) is Always Faster; Why?
...g a function for every row, your key matches don't use an index because of CASTING type conversion or NULLS or functions... Too many possibilities here.
In general when you write a query, you should have some mental picture of roughly how certain data is distributed within your table. A column f...