On 3/29/2014 8:06 PM, deadalnix wrote:
On Sunday, 30 March 2014 at 01:42:24 UTC, Walter Bright wrote:
True, but why is this a problem?
Higher memory consumption, less objects fitting in cache, more scanning to do
for the GC.
Debatable. All fields that are interface references would double in size.
and you don't need cascaded load to call methods.
True, but on the other hand, it takes up 2 registers rather than one, costing
twice as much to copy around, store, pass/return to functions, etc.
Two pointers structs are passed in register, which is fast. If that spill, that
spill on stack, which is hot, and prefetcher friendly.
That underestimates how precious register real estate is on the x86.
On the other hand, the double indirection is very cache unfriendly.
I suspect that the results of all this will be some use cases go faster, other
use cases go slower, a decidedly mixed result.
