Re: [Haskell-cafe] Inlinable (>>>)

I had a similar WTF moment when I noticed that Lucid's HtmlT over IO was 2x slower than HtmlT over Reader/Identity. Discussions over this mailing list pointed to the lack of INLINE pragmas on various functions, like >>= It was finally resolved via a liberal sprinkling of INLINE -- https://github.com/chrisdone/lucid/pull/67/files Why can't GHC automatically consider *every* function as INLINABLE? Let the GHC heuristics decide what is worthy of being inlined. What's the downside? -- Saurabh. On 3 Mar 2017 5:36 pm, "Matthew Pickering" wrote:

I suspect this is because GHC will not specialise functions when used in other modules unless they are marked INLINABLE.

Matt

On Fri, Mar 3, 2017 at 11:40 AM, Joachim Breitner wrote:

...

Hi,

Am Donnerstag, den 02.03.2017, 18:18 +0300 schrieb David Sorokin:

...

I offer to define the functions of the Control.Category module inlinable:

-- | Right-to-left composition (<<<) :: Category cat => cat b c -> cat a b -> cat a c {-# INLINABLE (<<<) #-} (<<<) = (.)

-- | Left-to-right composition (>>>) :: Category cat => cat a b -> cat b c -> cat a c {-# INLINABLE (>>>) #-} f >>> g = g . f

Perhaps all functions from this module should be marked by this pragma as possible.

I am surprised that GHC does not consider these inlineable automatically. Maybe it should? Would be worth investigating, if someone is interested in some entry-level GHC hacking, why GHC does not treat them as `INLINEABLE` in the first place. They are certainly small enough, I would say…

Joachim

-- Joachim “nomeata” Breitner mail@joachim-breitner.de • https://www.joachim-breitner.de/ XMPP: nomeata@joachim-breitner.de • OpenPGP-Key: 0xF0FBF51F Debian Developer: nomeata@debian.org _______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.

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