hc-devs On Behalf Of Viktor
| Dukhovni
| Sent: 20 November 2021 00:57
| To: ghc-devs@haskell.org
| Subject: [EXTERNAL] Unexpected duplicate join points in "Core" output?
|
| The below "Core" output from "ghc -O2" (9.2/8.10) for the attached
| program shows seemin
On Sat, Nov 20, 2021 at 09:15:15PM +, Simon Peyton Jones via ghc-devs wrote:
> GHC.Core.Opt.CSE is conservative at the moment, and never CSE's *any*
> join point. It would not be hard to make it clever enough to CSE join
> points, but no one has yet done it.
>
> Do open a ticket!
Thanks, I
stead. (For now, it just forwards to simo...@microsoft.com.)
>
> | -Original Message-
> | From: ghc-devs On Behalf Of Viktor
> | Dukhovni
> | Sent: 20 November 2021 00:57
> | To: ghc-devs@haskell.org
> | Subject: [EXTERNAL] Unexpected duplicate join points in &q
On Sun, Nov 21, 2021 at 06:53:53AM -0500, Carter Schonwald wrote:
> On Sat, Nov 20, 2021 at 4:17 PM Simon Peyton Jones via ghc-devs <
> ghc-devs@haskell.org> wrote:
>
> > There is absolutely no reason not to common-up those to join points. But
> > we can't common up some join points when we coul
November 2021 21:27
| To: ghc-devs@haskell.org
| Subject: Re: [EXTERNAL] Unexpected duplicate join points in "Core"
| output?
|
| On Sun, Nov 21, 2021 at 06:53:53AM -0500, Carter Schonwald wrote:
|
| > On Sat, Nov 20, 2021 at 4:17 PM Simon Peyton Jones via ghc-devs <
| > ghc-devs
On Wed, Nov 24, 2021 at 11:14:00PM +, Simon Peyton Jones via ghc-devs wrote:
> | For two join points to be duplicates they need to not only be alpha
> | equivalent but to also have the same continuation.
>
> Yes exactly. And it would not be hard to adapt the existing CSE pass
> to support t
On Wed, Nov 24, 2021 at 06:32:04PM -0500, Viktor Dukhovni wrote:
> > Yes exactly. And it would not be hard to adapt the existing CSE pass
> > to support this. Just needs doing.
> >
> > A ticket and a repo case would be really helpful.
>
> I'll do my best to construct a standalone reproducer tha
