Re: [fpc-devel] The 15k bounty: Optimizing executable speed forLinux x86 / LLVM

To add my two pence to this: Low-level optimisation is my personal speciality.  Currently a lot of what I do is on small savings within the peephole optimizer on x86 systems.  Generally the result is that the compiler runs slightly more slowly, but the final binary runs a bit more efficiently -

Re: [fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

On Sat, Oct 27, 2018 at 8:22 PM Ozz Nixon wrote: > * Sorry for off topic - just that grabbed my "What did he just say?" > button.. > Huh? I said "Also linked lists absolutely everywhere, that would perform much better as array based lists." Meaning, exactly the same thing you just implied. You

Re: [fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

SORRY - JUST RE-READ... that is what you are saying... it's late here ;-( On Sat, Oct 27, 2018 at 8:22 PM Ozz Nixon wrote: > * Not arguing, but... * > > Linked List faster than Array? > Unless I missed what you are talking about... I always teach programmers: > > Array is the fastest collection

Re: [fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

* Not arguing, but... * Linked List faster than Array? Unless I missed what you are talking about... I always teach programmers: Array is the fastest collection to use, followed by Linked List, followed by bTree, etc. * Sorry for off topic - just that grabbed my "What did he just say?"

Re: [fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

On Sat, Oct 27, 2018 at 6:46 PM Sven Barth via fpc-devel < fpc-devel@lists.freepascal.org> wrote: > Except of course for optimizations that can be done on the platform > independent node tree. > That specifically is IMO the "key" to a higher compiler-wide level of optimization capabilities, as

Re: [fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

Ben Grasset schrieb am So., 28. Okt. 2018, 00:29: > On Sat, Oct 27, 2018 at 1:38 PM Florian Klämpfl > wrote: > >> That it is useful to work on table based exception handling for all >> targets >> > > Not arguing with that at all. I was just trying to point out that I'm not > a fan of the idea

Re: [fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

On Sat, Oct 27, 2018 at 1:38 PM Florian Klämpfl wrote: > That it is useful to work on table based exception handling for all targets > Not arguing with that at all. I was just trying to point out that I'm not a fan of the idea that FPC's code generators are "good enough" as is.

Re: [fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

Am 27.10.2018 um 19:19 schrieb Michael Van Canneyt: > > > On Sat, 27 Oct 2018, Florian Klämpfl wrote: > >> If you read the whole thread, LLVM needs a rewritten exception handling as >> well. Further, a quick test >> of table based exception handling on bansi1 (which is mainly a memory >>

Re: [fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

Am 27.10.2018 um 18:21 schrieb Ben Grasset: > On Sat, Oct 27, 2018 at 8:47 AM Jonas Maebe > wrote: > > On 27/10/18 05:45, Ben Grasset wrote: > >    > > You also need "opt" if you want to perform full optimizations (or just > use clang, which a.o.

Re: [fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

On Sat, Oct 27, 2018 at 8:47 AM Jonas Maebe wrote: > On 27/10/18 05:45, Ben Grasset wrote: > You also need "opt" if you want to perform full optimizations (or just > use clang, which a.o. combines the functionality of llc and opt). > > There's one more problem I forgot to mention in my first

Re: [fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

On 27/10/18 05:45, Ben Grasset wrote: As far as dependencies, it would add none whatsoever other than a copy of the LLC or LLVM-AS binaries (as in, no more than any other target FPC supports. Just think of it as yet another assembler format.) You also need "opt" if you want to perform full

Re: [fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

On Saturday 27 October 2018 09:27:59 Sven Barth via fpc-devel wrote: > > > > Not really. The IR format has been pretty stable since version 3.9 or so > > (LLVM is current at version 8.) As far as dependencies, it would add none > > whatsoever other than a copy of the LLC or LLVM-AS binaries (as

Re: [fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

Ben Grasset schrieb am Sa., 27. Okt. 2018, 05:46: > On Thu, Oct 25, 2018 at 3:06 AM Sven Barth via fpc-devel < > fpc-devel@lists.freepascal.org> wrote: > >> Simon Kissel schrieb am Do., 25. Okt. >> 2018, 08:54: >> >>> - Complete the LLVM branch of FPC. It looks like Jonas has stopped >>>