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Why can't (or doesn't) the compiler optimize a predictable addition loop into a multiplication?
... # =>This Inner Loop Header: Depth=1
movsxd rdx, dword ptr [rdi + 4*rsi]
imul rcx, rdx, 100000
cmp rdx, 127
cmovle rcx, r8
add rax, rcx
add rsi, 1
cmp r9, rsi
jne .LBB0_4
ret
.LBB0_1:
...
How to sort an array in descending order in Ruby
...y_new2(len);
if (len > 0) {
const VALUE *p1 = RARRAY_CONST_PTR_TRANSIENT(ary);
VALUE *p2 = (VALUE *)RARRAY_CONST_PTR_TRANSIENT(dup) + len - 1;
do *p2-- = *p1++; while (--len > 0);
}
ARY_SET_LEN(dup, RARRAY_LEN(ary));
return dup;
}
do *p2-- = *p1++; wh...
Where in memory are my variables stored in C?
...in heap and memory address of that location will be returned and stored in ptr variable. The ptr variable will be on either the stack or data segment depending on the way it is declared/used.
Further reading
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C++ static virtual members?
...ariable "keeper":
class Object
{
public:
Object(){}
boost::scoped_ptr<TypeKeeper> keeper;
//not virtual
string getTypeInformation() const
{ return keeper? keeper->getTypeInformation(): string("base class"); }
};
In a derived class keeper must be initialized during ...
Possible reasons for timeout when trying to access EC2 instance
...in the port range, your local IP/32 in the source field, and leave 'custom tcp rule' in the dropdown.
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Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM
...compression issue first. There are some relevant tests already available:
http://www.theeggeadventure.com/wikimedia/index.php/Java_Data_Compression
"I ran a test to compress one million consecutive integers using
various forms of compression. The results are as follows:"
None 4000027
De...
What is the difference between NULL, '\0' and 0?
...
No, you won't compare ptr to all-bits-zero. This is not a memcmp, but this is a comparison using a builtin operator. The one side is a null pointer constant '\0', and the other side is a pointer. Aswell as with the other two versions with NULL and...
Remote Connections Mysql Ubuntu
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Return array in a function
...ay cleanly if it goes out of scope. That would look like this.
std::auto_ptr<std::vector<int> > fillarr( const std::vector<int> & arr) {
std::auto_ptr<std::vector<int> > myArr(new std::vector<int>);
// do stuff with arr and *myArr
return myArr;
}...
How to configure socket connect timeout
...t = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
// Connect using a timeout (5 seconds)
IAsyncResult result = socket.BeginConnect( sIP, iPort, null, null );
bool success = result.AsyncWaitHandle.WaitOne( 5000, true );
if ( socket.Connected )
{
socket.EndConnec...