On 02/13/2013 03:56 PM, Marco Leise wrote:
Ok, I get pretty much the same numbers as before with: ldmd2 -O -inline -release It's even a bit faster than my loooong command line.
My experience has been that the higher -O values of ldc don't do much, but of course, that's going to vary depending on your code. I think above -O3 it's all link-time, no?
Do these numbers tell us, that there are such huge differences in the handling of floating point value between different AMD64 CPUs? I can't quite make a rhyme of it yet.
AMD vs Intel might make a difference (my machine is an i7).
What version of LLVM are you using, mine is 3.1. 3.0 is minimum and 3.2 is recommended for LDC2.
LLVM 3.2.
_THAT_ I can reproduce with GDC! : D code serial with dimension 32768 ... using floats Total time: 24.415 [sec] using doubles Total time: 23.268 [sec] using reals Total time: 25.168 [sec] It's the exact same pattern.
I've never, EVER had ldc-compiled code run four times faster than GDC-compiled code. In fact, I don't think I've ever had LDC-compiled code run faster than GDC-compiled code at all, except where the choice of optimizations was different. That's what makes me concerned that there's some kind of bug in play here ....
