• Las (1/1) Mar 05 2017 Is Phobos compiled with LTO enabled?
• Temtaime (2/3) Mar 05 2017 There is no LTO with D.
• Daniel Kozak via Digitalmars-d (3/6) Mar 05 2017 Yes it is
• Johan Engelen (3/10) Mar 05 2017 And it appeared first in the recent LDC 1.1 release.
• Temtaime (3/10) Mar 07 2017 Being specific only for LDC and only on linux - it's a lie to say
• Johan Engelen (7/18) Mar 07 2017 Cheer up, you wrote "there is no LTO with D", which there clearly
• Johan Engelen (6/9) Mar 07 2017 Has anybody tried LLD on Windows for D already?
• kinke (12/22) Mar 07 2017 Yep, I gave LLD 3.9 a try on Win64 some weeks ago. Works out of
• Johan Engelen (6/10) Mar 08 2017 Niiice. Awesome indeed!
• Johan Engelen (3/7) Mar 08 2017 Er... stop me before doing something stupid :)
• Daniel Kozak via Digitalmars-d (4/23) Mar 07 2017 OTOH he maybe has dmd in mind when he speaking about D. It is a really
• Dmitry Olshansky (5/6) Mar 05 2017 LTO is *link* time optimization so I'd say it makes no sense for
• John Colvin (2/8) Mar 05 2017 Shared libraries are linked.
• Johan Engelen (10/14) Mar 05 2017 Static libraries _are_ linked into your executable and LTO is

Las <lasssafin gmail.com> writes:

Is Phobos compiled with LTO enabled?

Temtaime <temtaime gmail.com> writes:

On Sunday, 5 March 2017 at 17:17:13 UTC, Las wrote:
 Is Phobos compiled with LTO enabled?

There is no LTO with D.

Daniel Kozak via Digitalmars-d <digitalmars-d puremagic.com> writes:

Dne 5.3.2017 v 20:31 Temtaime via Digitalmars-d napsal(a):

 On Sunday, 5 March 2017 at 17:17:13 UTC, Las wrote:
 Is Phobos compiled with LTO enabled?

 There is no LTO with D.

Yes it is
https://johanengelen.github.io/ldc/2016/11/10/Link-Time-Optimization-LDC.html

Johan Engelen <j j.nl> writes:

On Sunday, 5 March 2017 at 19:52:12 UTC, Daniel Kozak wrote:
 Dne 5.3.2017 v 20:31 Temtaime via Digitalmars-d napsal(a):

 On Sunday, 5 March 2017 at 17:17:13 UTC, Las wrote:
 Is Phobos compiled with LTO enabled?

 There is no LTO with D.

 Yes it is
 https://johanengelen.github.io/ldc/2016/11/10/Link-Time-Optimization-LDC.html

And it appeared first in the recent LDC 1.1 release.

-Johan

Temtaime <temtaime gmail.com> writes:

On Sunday, 5 March 2017 at 19:52:12 UTC, Daniel Kozak wrote:
 Dne 5.3.2017 v 20:31 Temtaime via Digitalmars-d napsal(a):

 On Sunday, 5 March 2017 at 17:17:13 UTC, Las wrote:
 Is Phobos compiled with LTO enabled?

 There is no LTO with D.

 Yes it is
 https://johanengelen.github.io/ldc/2016/11/10/Link-Time-Optimization-LDC.html

Being specific only for LDC and only on linux - it's a lie to say 
simple « yes ».

Johan Engelen <j j.nl> writes:

On Tuesday, 7 March 2017 at 18:15:52 UTC, Temtaime wrote:
 On Sunday, 5 March 2017 at 19:52:12 UTC, Daniel Kozak wrote:
 Dne 5.3.2017 v 20:31 Temtaime via Digitalmars-d napsal(a):

 On Sunday, 5 March 2017 at 17:17:13 UTC, Las wrote:
 Is Phobos compiled with LTO enabled?

 There is no LTO with D.

 Yes it is
 https://johanengelen.github.io/ldc/2016/11/10/Link-Time-Optimization-LDC.html

 Being specific only for LDC and only on linux - it's a lie to 
 say simple « yes ».

Cheer up, you wrote "there is no LTO with D", which there clearly 
is. :-)

It works on OS X too.
And OS X is the only platform for which we package the LTO linker 
binaries in the release.

-Johan

Johan Engelen <j j.nl> writes:

On Tuesday, 7 March 2017 at 18:42:40 UTC, Johan Engelen wrote:
 It works on OS X too.
 And OS X is the only platform for which we package the LTO 
 linker binaries in the release.

Has anybody tried LLD on Windows for D already?
https://lld.llvm.org/windows_support.html

If LLD works (or another linker that can use the LLVM plugin), 
then LTO is also available on Windows.

-Johan

kinke <noone nowhere.com> writes:

On Tuesday, 7 March 2017 at 18:46:15 UTC, Johan Engelen wrote:
 On Tuesday, 7 March 2017 at 18:42:40 UTC, Johan Engelen wrote:
 It works on OS X too.
 And OS X is the only platform for which we package the LTO 
 linker binaries in the release.

 Has anybody tried LLD on Windows for D already?
 https://lld.llvm.org/windows_support.html

 If LLD works (or another linker that can use the LLVM plugin), 
 then LTO is also available on Windows.

 -Johan

Yep, I gave LLD 3.9 a try on Win64 some weeks ago. Works out of 
the box as drop-in replacement for Microsoft's link.exe, incl. 
usage of environment variables. What's apparently still lacking 
is debuginfos (.pdb) generation, so our CDB debugging tests 
failed (all others worked IIRC).
LLD is supposed to be significantly faster than Microsoft's 
linker; I haven't done any measurements yet. Besides offering 
nice stuff like LTO, integrating LLD should allow LDC to directly 
cross-compile *and* cross-link. So you'll only need the target 
system libs to produce objects, libraries and executables for 
'any' target. Which is pretty awesome.

Johan Engelen <j j.nl> writes:

On Tuesday, 7 March 2017 at 22:38:33 UTC, kinke wrote:
 
 Yep, I gave LLD 3.9 a try on Win64 some weeks ago. Works out of 
 the box as drop-in replacement for Microsoft's link.exe, incl. 
 usage of environment variables.

Niiice. Awesome indeed!

Does LLVM trunk automatically build an LLD LTO plugin on Windows? 
If not, we should ask about it on the LLVM mailing list.

cheers,
   Johan

Johan Engelen <j j.nl> writes:

On Wednesday, 8 March 2017 at 17:16:58 UTC, Johan Engelen wrote:
 
 Does LLVM trunk automatically build an LLD LTO plugin on 
 Windows? If not, we should ask about it on the LLVM mailing 
 list.

Er... stop me before doing something stupid :)
LTO is of course a native feature of LLD.

Daniel Kozak via Digitalmars-d <digitalmars-d puremagic.com> writes:

Dne 7.3.2017 v 19:42 Johan Engelen via Digitalmars-d napsal(a):

 On Tuesday, 7 March 2017 at 18:15:52 UTC, Temtaime wrote:
 On Sunday, 5 March 2017 at 19:52:12 UTC, Daniel Kozak wrote:
 Dne 5.3.2017 v 20:31 Temtaime via Digitalmars-d napsal(a):

 On Sunday, 5 March 2017 at 17:17:13 UTC, Las wrote:
 Is Phobos compiled with LTO enabled?

 There is no LTO with D.

 Yes it is
 https://johanengelen.github.io/ldc/2016/11/10/Link-Time-Optimization-LDC.html 

 Being specific only for LDC and only on linux - it's a lie to say 
 simple « yes ».

 Cheer up, you wrote "there is no LTO with D", which there clearly is. :-)

 It works on OS X too.
 And OS X is the only platform for which we package the LTO linker 
 binaries in the release.

 -Johan

OTOH he maybe has dmd in mind when he speaking about D. It is a really 
common pattern (problem) I am challenging every time (unfortunately) 
when I am speaking about D.

Dmitry Olshansky <dmitry.olsh gmail.com> writes:

On 3/5/17 6:17 PM, Las wrote:
 Is Phobos compiled with LTO enabled?

LTO is *link* time optimization so I'd say it makes no sense for 
libraries, as they are not linked.

---
Dmitry Olshansky

John Colvin <john.loughran.colvin gmail.com> writes:

On Sunday, 5 March 2017 at 21:00:32 UTC, Dmitry Olshansky wrote:
 On 3/5/17 6:17 PM, Las wrote:
 Is Phobos compiled with LTO enabled?

 LTO is *link* time optimization so I'd say it makes no sense 
 for libraries, as they are not linked.

 ---
 Dmitry Olshansky

Shared libraries are linked.

Johan Engelen <j j.nl> writes:

On Sunday, 5 March 2017 at 21:00:32 UTC, Dmitry Olshansky wrote:
 On 3/5/17 6:17 PM, Las wrote:
 Is Phobos compiled with LTO enabled?

 LTO is *link* time optimization so I'd say it makes no sense 
 for libraries, as they are not linked.

Static libraries _are_ linked into your executable and LTO is 
very relevant for libraries.
Having druntime and/or Phobos compiled with LTO enabled can 
provide massive speedups.
I have not worked on it yet, but it'd be awesome if we could ship 
LDC with LTO versions of druntime and Phobos. PRs with additions 
to our CMake files are very welcome! :-)

cheers,
   Johan