Yes, I believe there’s been a compiler regression for this specific example.
— John On Aug 24, 2014, at 5:54 PM, Mohammed El-Beltagy <mohammed.elbelt...@gmail.com> wrote: > The blog post by John > http://www.johnmyleswhite.com/notebook/2013/12/06/writing-type-stable-code-in-julia/ > demonstrated that massive improvements can be realized my having type stable > code. The reasoning was the type stable code, resulted in much more > efficient compiler generated code. This was very nicely empirically > demonstrated. It worked for Julia 0.2, but now it does not for 0.3. > > On Monday, August 25, 2014 3:19:34 AM UTC+3, Iain Dunning wrote: > Mohammed, the last post was over 6 months ago - what precisely is not valid? > > On Sunday, August 24, 2014 8:06:50 PM UTC-4, Mohammed El-Beltagy wrote: > That is no longer valid under in Julia 0.3. The code only runs 3x faster and > the type stable code looks a bit more complex. > > On Monday, December 16, 2013 8:48:40 PM UTC+2, John Myles White wrote: > I think Michael is suggesting that it would help to have an automated tool to > do this. This stuff comes up in subtle ways in complex code. While editing > some of the t-SNE code someone posted recently, I found that just removing a > single type-unstable call to maximum made the code 100x faster. It was a bit > too complex to read through code_typed or anything else, so automated tools > would make a big difference. > > -- John > > On Dec 16, 2013, at 10:46 AM, Ivar Nesje <iva...@gmail.com> wrote: > >> You might use code_typed and look at the output and see if it looks curious. >> >> kl. 19:28:05 UTC+1 mandag 16. desember 2013 skrev John Myles White følgende: >> I believe Leah was working on a tool to do some of this. >> >> -- John >> >> On Dec 16, 2013, at 10:22 AM, Michael Fox <415...@gmail.com> wrote: >> >> > After reading about type stability in the FAQ and this excellent post -- >> > http://www.johnmyleswhite.com/notebook/2013/12/06/writing-type-stable-code-in-julia/ >> > -- I want to make sure I'm doing it right. >> > >> > Is there any way to ask Julia if a particular function has achieved type >> > stability? This would be a good feature for julialint. >> >
