uint64_t nbrBytes = 4e8;
uint64_t count = 0;
for( uint64_t byteIndex = 0; byteIndex < nbrBytes; byteIndex++ )
{
count += byteIndex;
if ( ( byteIndex & 0xffffffff ) == 0 ) { count += 1.3; } (AAA)
};
Takes 260 msec.
Btw.: Without the (AAA) line the whole loop is done in 10 μsec. A really clever
compiler!
And with “count += 1” instead of “count += 1.3” it takes 410 msec. Very
strange.
But this is beside the point here.
Now Swift:
let nbrBytes = 400_000_000
var count = 0
for byteIndex in 0 ..< nbrBytes
{
count += byteIndex
if ( ( byteIndex & 0xffffffff ) == 0 ) {count += Int(1.3);}
}
takes 390 msec - about 50 % more.
Release build with default options.
Gerriet.
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