On Monday, 3 August 2015 at 17:33:30 UTC, aki wrote:
On Monday, 3 August 2015 at 16:47:58 UTC, John Colvin wrote:
changing two lines:
final class SubFoo : Foo {
int test(F)(F obj, int repeat) {
I tried it. DMD is no change, while GDC gets acceptable score.
D(DMD 2.067.1): 2.445
D(GDC 4.9.2/2.066): 0.928
Now I got a hint how to improve the code by hand.
Thanks, John.
But the original Java code that I'm porting is
about 10,000 lines of code.
And the performance is about 3 times different.
Yes! Java is 3 times faster than D in my app.
I hope the future DMD/GDC compiler will do the
similar optimization automatically, not by hand.
Aki.
LLVM might be able to do achieve Java's optimization for your use
case using profile-guided optimization. In principle, it's hard
to choose which function to inline without the function call
counts, but LLVM has a back-end with sampling support.
http://clang.llvm.org/docs/UsersManual.html#profile-guided-optimization
Whether or not this is or will be available soon for D in LDC is
a different matter.
