Jarrett Billingsley wrote:
On Sat, Dec 13, 2008 at 11:16 AM, Tomas Lindquist Olsen
<to...@famolsen.dk> wrote:
I tried this out with Tango + DMD 1.033, Tango + LDC r847 and GCC 4.3.2, my
timings are as follows, best of three:
$ dmd bench.d -O -release -inline
long arith: 55630 ms
nested loop: 5090 ms
$ ldc bench.d -O3 -release -inline
long arith: 13870 ms
nested loop: 120 ms
$ gcc bench.c -O3 -s -fomit-frame-pointer
long arith: 13600 ms
nested loop: 170 ms
My cpu is: Athlon64 X2 3800+
Go LDC!
I hope bearophile will eventually understand that DMD is not good at
optimizing code, and so comparing its output to GCC's is ultimately
meaningless.
I must have missed the memo. How is dmd not good at optimizing code?
Without knowing many details about it, my understanding is that dmd
performs common optimization reasonably well and that this particular
problem has to do with the long division routine.
Andrei
