On Friday, 3 March 2017 at 22:06:11 UTC, berni wrote:
On Friday, 3 March 2017 at 20:10:25 UTC, Ali Çehreli wrote:
Which would put gdc in between the two. Is your experience
different?
Actually, I've got not much experience. A few weeks ago I ran a
test where ldc was in between dmd and gdc. But I missed the
-release flags then. With that flag it's faster, but still
slower than gdc on that one (B below). With an other testcase,
where I compared them, gdc and ldc are on equals speed (A
below).
A) dmd 52s, gdc 22s, ldc 22s
B) dmd 432s, gdc 280s, ldc 310s
If you think you have a good testcase, it's nice for compiler
devs like me to open a new thread about the difference that you
found between the compilers (so that we can try and improve
things). Depending on language/Phobos/druntime versions of DMD,
LDC, and GDC, it's not always clear if the comparison is fair and
the results can be skewed.
(that said, I think on average, gcc creates slightly faster
binaries than clang, but those are highly developed compilers,
and LDC (at least) isn't. So I am not surprised if GDC creates
slightly faster binaries than LDC for some test cases. For other
test cases, LDC wins, but those are not so interesting. Because I
work on LDC, I'm always keen on seeing testcases where _GDC_
wins.)
Thanks!
Johan
