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<h3>
Sebastian Graf pushed to branch wip/refactor-demand
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c642a43abf2bbf766cc97ebd090e022e811eeabe">c642a43a</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-11-11T16:14:02+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Demand: Interleave usage and strictness demands (#18903)
As outlined in #18903, interleaving usage and strictness demands not
only means a more compact demand representation, but also allows us to
express demands that we weren't easily able to express before.
Call demands
============
Call demands are *relative* in the sense that a call demand `Cn(cd)`
on `g` says "`g` is called `n` times. *Whenever `g` is called*, the
result is used according to `cd`". Example from #18903:
```hs
h :: Int -> Int
h m =
let g :: Int -> (Int,Int)
g 1 = (m, 0)
g n = (2 * n, 2 `div` n)
{-# NOINLINE g #-}
in case m of
1 -> 0
2 -> snd (g m)
_ -> uncurry (+) (g m)
```
Without the interleaved representation, we would just get `L` for the
strictness demand on `g`. Now we are able to express that whenever
`g` is called, its second component is used strictly in denoting `g`
by `1C1((1(U),S(U)))`. This would allow Nested CPR to unbox the
division, for example.
Nested strict product demands
=============================
Fixing #18903 gives us enough expressiveness to tackle #18885, where we
have
```hs
f :: Int -> Int
f y =
let x
| expensive y == 1 = (expensive (y+1), expensive (y+2))
| otherwise = (expensive (y+3), expensive (y+4))
in case () of
_ | expensive (y+5) == 42 -> fst x
_ | expensive (y+6) == 41 -> fst x + snd x
_ | otherwise -> 0
```
Here, we used to give `x` demand `1P(1P(U),1P(U))`. The outer `1`
is because `x` is used lazily and the inner `1`s are redundant with
that fact. That leaves some expressiveness on the table. After this
change, we infer `1P(SP(U),1P(U))`, meaning that *whenever we evaluate
`x`*, we evaluate its first component strictly, effectively making
strictness product demands apply *relatively*. Usage product demands
still apply absolutely, though.
More details on how we could exploit the new language in
`Note [Absent sub-demands]`.
Fixes #18903 and fixes #18885.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d2d37c6d70a93854090a91467e5987102e4d4d7">3d2d37c6</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-11-11T16:14:02+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update user's guide entry on demand analysis and worker/wrapper
The demand signature notation has been undocumented for a long time.
The only source to understand it, apart from reading the `Outputable`
instance, has been an outdated wiki page.
Since the previous commits have reworked the demand lattice, I took
it as an opportunity to also write some documentation about notation.
</pre>
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