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<h3>
Sebastian Graf pushed to branch wip/primop-traits
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/bbd20a71a1f27bc03cb8e59acf5ccb6516a2de37">bbd20a71</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-04-01T17:23:55+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clear up PrimOp effect semantics
Previously we classified PrimOps with two boolean flags, `can_fail` and
`has_side_effects`. Although there is quite a slew of documentation
surrounding them, see `Note [PrimOp can_fail and has_side_effects]`
and `Note [Transformations affected by can_fail and has_side_effects]`,
I found it quite hard to understand and also was confused of
conservative misclassifications for some read-only primops like
`readMutVar#` (which is marked as `has_side_effect`, although it
actually shouldn't per semantics of `has_side_effect`, see #3207), but
not for others (`indexIntArr#`, which is just `can_fail`).
This patch defines a total order of 5 different `PrimOpEffect`s:
- `NoEffect`: A pure primop
- `ReadEffect`: Ideally, `readMutVar#` should be this kind of effect,
but due to #3207 it's a `WriteEffect` and this effect will probably be
unused (TODO: Implement and comment on this).
- `ThrowsImprecise`: Possibly throws an imprecise exception (and may
perform read effects)
- `WriteEffect`: May write to a mutable ref cell, array or the world (or
read from them or throw an imprecise exception)
- `ThrowsPrecise`: May throw a precise exception, or do any of the
aforementioned effects.
Each effect is strictly "stronger" than its predecessor in this list
wrt. to program transformation that are sound to apply to it.
For example, we may speculatively execute read effects (as long as their
data dependencies such as the state token are satisfied), but we may not
speculate division (for fear of imprecise division-by-zero errors).
Which `PrimOpEffect` inhibits which transformation, including examples,
is spelled out in the rewritten `Note [Transformations affected by
PrimOpEffect]`.
Fixes #17900.
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<h4>1 changed file:</h4>
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<a href="#9715ddba4708ba02dac192a1f72fa50717761aff">
compiler/prelude/PrimOp.hs
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<h4>Changes:</h4>
<li id="9715ddba4708ba02dac192a1f72fa50717761aff">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bbd20a71a1f27bc03cb8e59acf5ccb6516a2de37#9715ddba4708ba02dac192a1f72fa50717761aff"><strong>compiler/prelude/PrimOp.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -299,132 +299,180 @@ perform a heap check or they block.</td>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"><span class="n" style="color: #333;">primOpOutOfLine</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PrimOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"primop-out-of-line.hs-incl"</span></span>
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC305" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;"> <span id="LC306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Failure and side effects</span></span>
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<pre style="margin: 0;"> <span id="LC307" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;"> <span id="LC308" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC310" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Checking versus non-checking primops]</span></span>
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<pre style="margin: 0;">-<span id="LC310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC311" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> In GHC primops break down into two classes:</span></span>
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<pre style="margin: 0;">-<span id="LC313" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a. Checking primops behave, for instance, like division. In this</span></span>
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<pre style="margin: 0;">-<span id="LC315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case the primop may throw an exception (e.g. division-by-zero)</span></span>
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<pre style="margin: 0;">-<span id="LC316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and is consequently is marked with the can_fail flag described below.</span></span>
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<pre style="margin: 0;">-<span id="LC317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The ability to fail comes at the expense of precluding some optimizations.</span></span>
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<pre style="margin: 0;">-<span id="LC318" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b. Non-checking primops behavior, for instance, like addition. While</span></span>
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<pre style="margin: 0;">-<span id="LC320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> addition can overflow it does not produce an exception. So can_fail is</span></span>
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<pre style="margin: 0;">-<span id="LC321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> set to False, and we get more optimisation opportunities. But we must</span></span>
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<pre style="margin: 0;">-<span id="LC322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> never throw an exception, so we cannot rewrite to a call to error.</span></span>
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<pre style="margin: 0;">-<span id="LC323" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> It is important that a non-checking primop never be transformed in a way that</span></span>
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<pre style="margin: 0;">-<span id="LC325" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> would cause it to bottom. Doing so would violate Core's let/app invariant</span></span>
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<pre style="margin: 0;">-<span id="LC326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (see Note [Core let/app invariant] in GHC.Core) which is critical to</span></span>
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<pre style="margin: 0;">-<span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the simplifier's ability to float without fear of changing program meaning.</span></span>
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<pre style="margin: 0;">-<span id="LC328" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC329" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [PrimOp can_fail and has_side_effects]</span></span>
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<pre style="margin: 0;">-<span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Both can_fail and has_side_effects mean that the primop has</span></span>
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<pre style="margin: 0;">-<span id="LC333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">some effect that is not captured entirely by its result value.</span></span>
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<pre style="margin: 0;">-<span id="LC334" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">---------- has_side_effects ---------------------</span></span>
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<pre style="margin: 0;">-<span id="LC336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A primop "has_side_effects" if it has some *write* effect, visible</span></span>
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<pre style="margin: 0;">-<span id="LC337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">elsewhere</span></span>
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<pre style="margin: 0;">-<span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - writing to the world (I/O)</span></span>
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<pre style="margin: 0;">-<span id="LC339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - writing to a mutable data structure (writeIORef)</span></span>
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<pre style="margin: 0;">-<span id="LC340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - throwing a synchronous Haskell exception</span></span>
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<pre style="margin: 0;">-<span id="LC341" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Often such primops have a type like</span></span>
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<pre style="margin: 0;">-<span id="LC343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> State -> input -> (State, output)</span></span>
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<pre style="margin: 0;">-<span id="LC344" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so the state token guarantees ordering. In general we rely *only* on</span></span>
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<pre style="margin: 0;">-<span id="LC345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data dependencies of the state token to enforce write-effect ordering</span></span>
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<pre style="margin: 0;">-<span id="LC346" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * NB1: if you inline unsafePerformIO, you may end up with</span></span>
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<pre style="margin: 0;">-<span id="LC348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> side-effecting ops whose 'state' output is discarded.</span></span>
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<pre style="margin: 0;">-<span id="LC349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> And programmers may do that by hand; see #9390.</span></span>
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<pre style="margin: 0;">-<span id="LC350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> That is why we (conservatively) do not discard write-effecting</span></span>
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<pre style="margin: 0;">-<span id="LC351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> primops even if both their state and result is discarded.</span></span>
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<pre style="margin: 0;">-<span id="LC352" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * NB2: We consider primops, such as raiseIO#, that can raise a</span></span>
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<pre style="margin: 0;">-<span id="LC354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (Haskell) synchronous exception to "have_side_effects" but not</span></span>
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<pre style="margin: 0;">-<span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> "can_fail". We must be careful about not discarding such things;</span></span>
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<pre style="margin: 0;">-<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> see the paper "A semantics for imprecise exceptions".</span></span>
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<pre style="margin: 0;">-<span id="LC357" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * NB3: *Read* effects (like reading an IORef) don't count here,</span></span>
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<pre style="margin: 0;">-<span id="LC359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> because it doesn't matter if we don't do them, or do them more than</span></span>
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<pre style="margin: 0;">-<span id="LC360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> once. *Sequencing* is maintained by the data dependency of the state</span></span>
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<pre style="margin: 0;">-<span id="LC361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> token.</span></span>
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<pre style="margin: 0;">-<span id="LC362" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">---------- can_fail ----------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A primop "can_fail" if it can fail with an *unchecked* exception on</span></span>
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<pre style="margin: 0;">-<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">some elements of its input domain. Main examples:</span></span>
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<pre style="margin: 0;">-<span id="LC366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> division (fails on zero denominator)</span></span>
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<pre style="margin: 0;">-<span id="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> array indexing (fails if the index is out of bounds)</span></span>
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368
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<pre style="margin: 0;">-<span id="LC368" class="line" lang="haskell"></span>
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369
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<pre style="margin: 0;">-<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">An "unchecked exception" is one that is an outright error, (not</span></span>
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370
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<pre style="margin: 0;">-<span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">turned into a Haskell exception,) such as seg-fault or</span></span>
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371
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<pre style="margin: 0;">-<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">divide-by-zero error. Such can_fail primops are ALWAYS surrounded</span></span>
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372
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<pre style="margin: 0;">-<span id="LC372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with a test that checks for the bad cases, but we need to be</span></span>
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373
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<pre style="margin: 0;">-<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">very careful about code motion that might move it out of</span></span>
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374
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the scope of the test.</span></span>
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375
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"></span>
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376
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<pre style="margin: 0;">-<span id="LC376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Transformations affected by can_fail and has_side_effects]</span></span>
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377
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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378
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<pre style="margin: 0;">-<span id="LC378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The can_fail and has_side_effects properties have the following effect</span></span>
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379
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<pre style="margin: 0;">-<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on program transformations. Summary table is followed by details.</span></span>
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380
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<pre style="margin: 0;">-<span id="LC380" class="line" lang="haskell"></span>
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381
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> can_fail has_side_effects</span></span>
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382
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<pre style="margin: 0;">-<span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Discard YES NO</span></span>
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383
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<pre style="margin: 0;">-<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Float in YES YES</span></span>
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384
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<pre style="margin: 0;">-<span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Float out NO NO</span></span>
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385
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<pre style="margin: 0;">-<span id="LC385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Duplicate YES NO</span></span>
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311
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell"><span class="cd">-- | A classification of primops by triggered side effects.</span></span>
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312
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Classification by PrimOpEffect].</span></span>
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313
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<pre style="margin: 0;">+<span id="LC313" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The `Ord` instance is significant. A "stronger" effect means less</span></span>
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314
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<pre style="margin: 0;">+<span id="LC314" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- transformations are sound to apply to them.</span></span>
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315
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<pre style="margin: 0;">+<span id="LC315" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">PrimOpEffect</span></span>
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316
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<pre style="margin: 0;">+<span id="LC316" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoEffect</span></span>
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317
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<pre style="margin: 0;">+<span id="LC317" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ReadEffect</span></span>
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318
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<pre style="margin: 0;">+<span id="LC318" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ThrowsImprecise</span></span>
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319
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<pre style="margin: 0;">+<span id="LC319" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">WriteEffect</span></span>
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<pre style="margin: 0;">+<span id="LC320" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ThrowsPrecise</span></span>
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<pre style="margin: 0;">+<span id="LC321" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Ord</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC322" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC323" class="line" lang="haskell"><span class="cd">-- | Can we discard a call to the primop, i.e. @case a `op` b of _ -> rhs@?</span></span>
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<pre style="margin: 0;">+<span id="LC324" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is a question that i.e. the Simplifier asks before dropping the @case@.</span></span>
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<pre style="margin: 0;">+<span id="LC325" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Transformations affected by can_fail and has_side_effects].</span></span>
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<pre style="margin: 0;">+<span id="LC326" class="line" lang="haskell"><span class="n" style="color: #333;">isDiscardablePrimOpEffect</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PrimOpEffect</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell"><span class="n" style="color: #333;">isDiscardablePrimOpEffect</span> <span class="n" style="color: #333;">eff</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eff</span> <span class="o" style="font-weight: 600;"><=</span> <span class="kt" style="color: #458; font-weight: 600;">ThrowsImprecise</span></span>
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<pre style="margin: 0;">+<span id="LC328" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"><span class="cd">-- | Can we duplicate a call to the primop?</span></span>
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<pre style="margin: 0;">+<span id="LC330" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is a question that i.e. the Simplifier asks when inlining definitions</span></span>
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- involving primops with multiple syntactic occurrences.</span></span>
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Transformations affected by can_fail and has_side_effects].</span></span>
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="haskell"><span class="n" style="color: #333;">isDupablePrimOpEffect</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PrimOpEffect</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC334" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- isDupablePrimOpEffect eff = True -- #3207, see the Note</span></span>
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"><span class="n" style="color: #333;">isDupablePrimOpEffect</span> <span class="n" style="color: #333;">eff</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eff</span> <span class="o" style="font-weight: 600;"><=</span> <span class="kt" style="color: #458; font-weight: 600;">ThrowsImprecise</span></span>
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC337" class="line" lang="haskell"><span class="cd">-- | Can we perform other actions first before entering the primop?</span></span>
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is the question that i.e. @FloatIn@ asks.</span></span>
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Transformations affected by can_fail and has_side_effects].</span></span>
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<pre style="margin: 0;">+<span id="LC340" class="line" lang="haskell"><span class="n" style="color: #333;">isDeferrablePrimOpEffect</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PrimOpEffect</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"><span class="n" style="color: #333;">isDeferrablePrimOpEffect</span> <span class="n" style="color: #333;">eff</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eff</span> <span class="o" style="font-weight: 600;"><=</span> <span class="kt" style="color: #458; font-weight: 600;">WriteEffect</span></span>
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"><span class="cd">-- | Can we speculatively execute this primop, before performing other actions</span></span>
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that should come first according to evaluation strategy?</span></span>
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is the question that i.e. @FloatOut@ (of a @case@) asks.</span></span>
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Transformations affected by can_fail and has_side_effects].</span></span>
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"><span class="n" style="color: #333;">isSpeculatablePrimOpEffect</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PrimOpEffect</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="haskell"><span class="n" style="color: #333;">isSpeculatablePrimOpEffect</span> <span class="n" style="color: #333;">eff</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eff</span> <span class="o" style="font-weight: 600;"><=</span> <span class="kt" style="color: #458; font-weight: 600;">ReadEffect</span></span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Classification by PrimOpEffect]</span></span>
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Some primops have effects that are not captured entirely by their result value.</span></span>
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We distinguish these cases:</span></span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * NoEffect: Pure primop, like `plusInt#`.</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * ReadEffect: A read-only primop, like `readMutVar#`, if it wasn't for #3207.</span></span>
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * ThrowsImprecise: Possibly throws an *imprecise* exception, like</span></span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> division-by-zero or a segfault arising from an out of bounds array access.</span></span>
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> An imprecise exception is an outright error and transformations may play</span></span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fast and loose by turning one imprecise exception into another, or bottom.</span></span>
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Precise vs imprecise exceptions] in GHC.Types.Demand.</span></span>
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * WriteEffect: A write side-effect, either writing to the RealWorld (IO) or</span></span>
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363
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<pre style="margin: 0;">+<span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to a mutable variable (`writeMutVar#`).</span></span>
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364
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * ThrowsPrecise: Possibly throws a *precise* exception. `raiseIO#` is the</span></span>
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365
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> only primop that does that.</span></span>
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366
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Precise vs imprecise exceptions] in GHC.Types.Demand.</span></span>
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367
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="haskell"></span>
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368
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why is this classification necessary? Because the kind of effect a primop</span></span>
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369
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">performs influences the transformations we are allowed to apply to it.</span></span>
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370
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<pre style="margin: 0;">+<span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For example let binding a division-by-zero (which `ThrowsImprecise`) might</span></span>
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371
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">violate Core's let/app invariant (see Note [Core let/app invariant] in</span></span>
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372
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Core) which is critical to the simplifier's ability to float without fear</span></span>
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373
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of changing program meaning.</span></span>
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374
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"></span>
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375
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See Note [Transformations affected by PrimOpEffect].</span></span>
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376
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"></span>
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377
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Transformations affected by PrimOpEffect]</span></span>
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378
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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379
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The PrimOpEffect of a primop affects applicability of program transformations</span></span>
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380
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in the following way.</span></span>
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381
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Summary table is followed by details.</span></span>
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382
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"></span>
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383
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | NoEff. | ReadEff. | ThrowsImp. | WriteEff. | ThrowsPrec. |</span></span>
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384
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Discard | YES | YES | YES | NO | NO |</span></span>
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385
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Dupe | YES | NO^[1] | NO^[1] | NO | NO |</span></span>
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386
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Defer | YES | YES | YES | YES | NO |</span></span>
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Speculate | YES | YES | NO | NO | NO |</span></span>
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">[1] This is only due to #3207, and should only apply to read effects that can</span></span>
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be interleaved with write effects (e.g. mutable arrays as opposed to immutable</span></span>
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ones). More details below.</span></span>
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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note how there is a total order on effects in terms of which program</span></span>
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<pre style="margin: 0;">+<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tranformations they inhibit. A "stronger" effect means less transformations</span></span>
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<pre style="margin: 0;">+<span id="LC395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are sound to apply to it. NoEffect means any tranformation is sound;</span></span>
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<pre style="margin: 0;">+<span id="LC396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ThrowsPrecise means none of the following is.</span></span>
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<pre style="margin: 0;">+<span id="LC397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Whether or not a primop is cheap to evaluate is an orthogonal concern.</span></span>
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<pre style="margin: 0;"> <span id="LC398" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Discarding. case (a `op` b) of _ -> rhs ===> rhs</span></span>
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<pre style="margin: 0;">-<span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> You should not discard a <span class="idiff left right">has_side_effects</span> primop; e.g.</span></span>
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<pre style="margin: 0;">+<span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> You should not discard a <span class="idiff left right">WriteEffect or ThrowsPrecise</span> primop; e.g.</span></span>
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<pre style="margin: 0;"> <span id="LC401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case (writeIntArray# a i v s of (# _, _ #) -> True</span></span>
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<pre style="margin: 0;">-<span id="LC390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Arguably you should be able to discard this, since the</span></span>
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<pre style="margin: 0;">-<span id="LC391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> returned stat token is not used, but that relies on NEVER</span></span>
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<pre style="margin: 0;">-<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inlining unsafePerformIO, and programmers sometimes write</span></span>
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> this kind of stuff by hand (#9390). So we (conservatively)</span></span>
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<pre style="margin: 0;">-<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> never discard a has_side_effects primop.</span></span>
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<pre style="margin: 0;">-<span id="LC395" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> However, it's fine to discard a can_fail primop. For example</span></span>
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<pre style="margin: 0;">+<span id="LC402" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Arguably you should be able to discard this, since the returned state token</span></span>
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<pre style="margin: 0;">+<span id="LC403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is not used, but that relies on NEVER inlining unsafePerformIO, and</span></span>
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<pre style="margin: 0;">+<span id="LC404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> programmers sometimes write this kind of stuff by hand (#9390). So we</span></span>
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<pre style="margin: 0;">+<span id="LC405" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (conservatively) never discard such a primop.</span></span>
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<pre style="margin: 0;">+<span id="LC406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The situation with ThrowsPrecise primops such as raiseIO# is even more</span></span>
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> restrictive: We may never discard a side effect throwing a precise exception.</span></span>
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<pre style="margin: 0;">+<span id="LC408" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> However, it's fine to discard a ThrowsImprecise primop. For example</span></span>
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case (indexIntArray# a i) of _ -> True</span></span>
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<pre style="margin: 0;">-<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We can discard indexIntArray#; it has can_fail, but not</span></span>
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<pre style="margin: 0;">-<span id="LC399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> has_side_effects; see #5658 which was all about this.</span></span>
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<pre style="margin: 0;">-<span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Notice that indexIntArray# is (in a more general handling of</span></span>
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<pre style="margin: 0;">-<span id="LC401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> effects) read effect, but we don't care about that here, and</span></span>
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<pre style="margin: 0;">-<span id="LC402" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> treat read effects as *not* has_side_effects.</span></span>
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<pre style="margin: 0;">-<span id="LC403" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Similarly (a `/#` b) can be discarded. It can seg-fault or</span></span>
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<pre style="margin: 0;">-<span id="LC405" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> cause a hardware exception, but not a synchronous Haskell</span></span>
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<pre style="margin: 0;">-<span id="LC406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exception.</span></span>
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<pre style="margin: 0;">-<span id="LC407" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC408" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC409" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Synchronous Haskell exceptions, e.g. from raiseIO#, are treated</span></span>
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<pre style="margin: 0;">-<span id="LC411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> as has_side_effects and hence are not discarded.</span></span>
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We can discard indexIntArray#; it might throw an imprecise segmentation</span></span>
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<pre style="margin: 0;">+<span id="LC412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fault, but no precise exception, so we are OK with not observing it.</span></span>
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<pre style="margin: 0;">+<span id="LC413" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See #5658 which was all about this.</span></span>
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<pre style="margin: 0;">+<span id="LC414" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Similarly (a `/#` b) can be discarded. It can seg-fault or cause a hardware</span></span>
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<pre style="margin: 0;">+<span id="LC415" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exception, but not a precise Haskell exception.</span></span>
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<pre style="margin: 0;">+<span id="LC416" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> It's obviously fine to discard a ReadEffect if its result aren't used.</span></span>
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<pre style="margin: 0;">+<span id="LC417" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC418" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Duplication. Example: The Simplifier inlines a (multi occ) binding.</span></span>
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<pre style="margin: 0;">+<span id="LC419" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> You cannot duplicate any effectful primop participating in state token</span></span>
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<pre style="margin: 0;">+<span id="LC420" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> threading. Not even what is actually a read-only effect like `readMutVar#`,</span></span>
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<pre style="margin: 0;">+<span id="LC421" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> see #3207.</span></span>
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<pre style="margin: 0;">+<span id="LC422" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> You might wonder how that can be problematic, but just look at</span></span>
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<pre style="margin: 0;">+<span id="LC423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Control.Monad.ST.Lazy.Imp.strictToLazy! We get something like this</span></span>
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<pre style="margin: 0;">+<span id="LC424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> p = case readMutVar# s v of</span></span>
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<pre style="margin: 0;">+<span id="LC425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (# s', r #) -> (S# s', r)</span></span>
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<pre style="margin: 0;">+<span id="LC426" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> s' = case p of (s', r) -> s'</span></span>
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<pre style="margin: 0;">+<span id="LC427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> r = case p of (s', r) -> r</span></span>
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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC413" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Float in. You can float a can_fail or has_side_effects primop</span></span>
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414
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<pre style="margin: 0;">-<span id="LC414" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *inwards*, but not inside a lambda (see Duplication below).</span></span>
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<pre style="margin: 0;">+<span id="LC429" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (All these bindings are boxed.) If we inline p at its two call</span></span>
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<pre style="margin: 0;">+<span id="LC430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> sites, we get a catastrophe: because the read is performed once when</span></span>
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<pre style="margin: 0;">+<span id="LC431" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> s' is demanded, and once when 'r' is demanded, which may be much</span></span>
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<pre style="margin: 0;">+<span id="LC432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> later. Utterly wrong. #3207 is real example of this happening.</span></span>
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433
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<pre style="margin: 0;"> <span id="LC433" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC416" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Float out. You must not float a can_fail primop *outwards* lest</span></span>
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417
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<pre style="margin: 0;">-<span id="LC417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> you escape the dynamic scope of the test. Example:</span></span>
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<pre style="margin: 0;">+<span id="LC434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If it wasn't for working around state token threading</span></span>
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<pre style="margin: 0;">+<span id="LC435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (see https://gitlab.haskell.org/ghc/ghc/issues/3207#note_257470 for other</span></span>
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<pre style="margin: 0;">+<span id="LC436" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> approaches), then duplication wouldn't be an issue at all, soundness-wise.</span></span>
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<pre style="margin: 0;">+<span id="LC437" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> But for the time being, we mark primops that participate in state token</span></span>
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<pre style="margin: 0;">+<span id="LC438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> threading such as `readMutVar#` (a ReadEffect at heart) and `readArray#`</span></span>
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<pre style="margin: 0;">+<span id="LC439" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (ThrowsImprecise) as WriteEffect and say that we may not duplicate</span></span>
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<pre style="margin: 0;">+<span id="LC440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> WriteEffect.</span></span>
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<pre style="margin: 0;">+<span id="LC441" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Deferring. Example: FloatIn, here inside a single-alt case:</span></span>
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<pre style="margin: 0;">+<span id="LC443" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case (a `op` b) of (# s, x #) -> case e of p -> rhs</span></span>
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<pre style="margin: 0;">+<span id="LC444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ==></span></span>
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<pre style="margin: 0;">+<span id="LC445" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case e of p -> case (a `op` b) of (# s, x #) -> rhs</span></span>
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<pre style="margin: 0;">+<span id="LC446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note that e might diverge (or throw an imprecise exception) and thus the</span></span>
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<pre style="margin: 0;">+<span id="LC447" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> side-effect we would observe by evaluating op might not happen if we defer it</span></span>
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<pre style="margin: 0;">+<span id="LC448" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> after e.</span></span>
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<pre style="margin: 0;">+<span id="LC449" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC450" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> That is a problem if op ThrowsPrecise: If e diverges, the user can catch</span></span>
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<pre style="margin: 0;">+<span id="LC451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the precise exception /before/ FloatIn, but not afterwards. Hence we may not</span></span>
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<pre style="margin: 0;">+<span id="LC452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> float in a ThrowsPrecise primop like raiseIO#.</span></span>
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<pre style="margin: 0;">+<span id="LC453" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> But since e can never throw an imprecise exception, there is no</span></span>
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<pre style="margin: 0;">+<span id="LC455" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> non-imprecise-exceptional control flow in which it is possible to observe</span></span>
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<pre style="margin: 0;">+<span id="LC456" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that a WriteEffect (and anything "weaker") didn't happen. So it's OK to</span></span>
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<pre style="margin: 0;">+<span id="LC457" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> defer (every weaker than or equal to) write effects. So you can float a</span></span>
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<pre style="margin: 0;">+<span id="LC458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> WriteEffect *inwards*, but not inside a lambda (see Duplication below [SG: It</span></span>
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<pre style="margin: 0;">+<span id="LC459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> isn't obvious to me how that explains why we shouldn't float inside a lambda</span></span>
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<pre style="margin: 0;">+<span id="LC460" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> at all]).</span></span>
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<pre style="margin: 0;">+<span id="LC461" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC462" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Speculating. Example: Float out.</span></span>
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<pre style="margin: 0;">+<span id="LC463" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> You must not float a ThrowsImprecise primop *outwards* lest you escape the</span></span>
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<pre style="margin: 0;">+<span id="LC464" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dynamic scope of the test. Example:</span></span>
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<pre style="margin: 0;"> <span id="LC465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case d ># 0# of</span></span>
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<pre style="margin: 0;"> <span id="LC466" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> True -> case x /# d of r -> r +# 1</span></span>
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> False -> 0</span></span>
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<pre style="margin: 0;">-<span id="LC421" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here we must not float the <span class="idiff left right">case</span> outwards to give</span></span>
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<pre style="margin: 0;">+<span id="LC468" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here we must not float the <span class="idiff left right">division</span> outwards to give</span></span>
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<pre style="margin: 0;"> <span id="LC469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case x/# d of r -></span></span>
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<pre style="margin: 0;"> <span id="LC470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case d ># 0# of</span></span>
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<pre style="margin: 0;"> <span id="LC471" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> True -> r +# 1</span></span>
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<pre style="margin: 0;"> <span id="LC472" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> False -> 0</span></span>
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<pre style="margin: 0;">+<span id="LC473" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Now the potential division by zero will be performed in both branches.</span></span>
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<pre style="margin: 0;"> <span id="LC474" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">Nor can you float out a has_side_effects</span> primop. For example:</span></span>
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<pre style="margin: 0;">+<span id="LC475" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">Similarly you can't float out a (stronger) WriteEffect</span> primop. For example:</span></span>
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<pre style="margin: 0;"> <span id="LC476" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if blah then case writeMutVar# v True s0 of (# s1 #) -> s1</span></span>
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<pre style="margin: 0;"> <span id="LC477" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> else s0</span></span>
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<pre style="margin: 0;"> <span id="LC478" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Notice that s0 is mentioned in both branches of the 'if', but</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -435,22 +483,9 @@ Duplicate YES NO</td>
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<pre style="margin: 0;"> <span id="LC483" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the writeMutVar will be performed in both branches, which is</span></span>
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<pre style="margin: 0;"> <span id="LC484" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> utterly wrong.</span></span>
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<pre style="margin: 0;"> <span id="LC485" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Duplication. You cannot duplicate a has_side_effect primop. You</span></span>
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<pre style="margin: 0;">-<span id="LC439" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> might wonder how this can occur given the state token threading, but</span></span>
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<pre style="margin: 0;">-<span id="LC440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> just look at Control.Monad.ST.Lazy.Imp.strictToLazy! We get</span></span>
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<pre style="margin: 0;">-<span id="LC441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> something like this</span></span>
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<pre style="margin: 0;">-<span id="LC442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> p = case readMutVar# s v of</span></span>
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<pre style="margin: 0;">-<span id="LC443" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (# s', r #) -> (S# s', r)</span></span>
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<pre style="margin: 0;">-<span id="LC444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> s' = case p of (s', r) -> s'</span></span>
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<pre style="margin: 0;">-<span id="LC445" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> r = case p of (s', r) -> r</span></span>
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<pre style="margin: 0;">-<span id="LC446" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC447" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (All these bindings are boxed.) If we inline p at its two call</span></span>
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448
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<pre style="margin: 0;">-<span id="LC448" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> sites, we get a catastrophe: because the read is performed once when</span></span>
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449
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<pre style="margin: 0;">-<span id="LC449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> s' is demanded, and once when 'r' is demanded, which may be much</span></span>
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450
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<pre style="margin: 0;">-<span id="LC450" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> later. Utterly wrong. #3207 is real example of this happening.</span></span>
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451
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<pre style="margin: 0;">-<span id="LC451" class="line" lang="haskell"></span>
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452
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<pre style="margin: 0;">-<span id="LC452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> However, it's fine to duplicate a can_fail primop. That is really</span></span>
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453
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<pre style="margin: 0;">-<span id="LC453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the only difference between can_fail and has_side_effects.</span></span>
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<pre style="margin: 0;">+<span id="LC486" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> It's OK to speculate read effects such as readMutVar#, though, because</span></span>
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<pre style="margin: 0;">+<span id="LC487" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> they can't move before a i.e. write effect purely by data dependency on the</span></span>
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<pre style="margin: 0;">+<span id="LC488" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> state token.</span></span>
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489
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<pre style="margin: 0;"> <span id="LC489" class="line" lang="haskell"></span>
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490
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Implementation: how can_fail/has_side_effects affect transformations]</span></span>
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491
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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