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<h3>
Ben Gamari pushed to branch wip/T16742
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/041960356df883d5883f973acefe44f15b678f4e">04196035</a></strong>
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<span>by Ben Gamari</span>
<i>at 2019-06-11T22:50:52Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PrelRules: Don't break let/app invariant in shiftRule
Previously shiftRule would rewrite as invalid shift like
```
let x = I# (uncheckedIShiftL# n 80)
in ...
```
to
```
let x = I# (error "invalid shift")
in ...
```
However, this breaks the let/app invariant as `error` is not
okay-for-speculation. There isn't an easy way to avoid this so let's not
try. Instead we just take advantage of the undefined nature of invalid
shifts and return zero.
Fixes #16742.
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<h4>7 changed files:</h4>
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<li class="file-stats">
<a href="#c51feff1097e886121a45f5d4b0baf4d9793d59e">
compiler/coreSyn/CoreSyn.hs
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<li class="file-stats">
<a href="#844514241b3e1a009f66bf594cbb57fef61482fb">
compiler/prelude/PrelRules.hs
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<li class="file-stats">
<a href="#9715ddba4708ba02dac192a1f72fa50717761aff">
compiler/prelude/PrimOp.hs
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<li class="file-stats">
<a href="#4d59cf0c96c12a05bf8356f74fc6e243511066d1">
testsuite/tests/codeGen/should_run/T16449_2.hs
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<a href="#fc71411b980ba2e43ce1a3ea8b896057e74537a6">
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−
testsuite/tests/codeGen/should_run/T16449_2.stderr
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+
testsuite/tests/codeGen/should_run/T16449_2.stdout
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<a href="#b9bba9766faf563ab195fb1402f14fa78ad5c66f">
testsuite/tests/codeGen/should_run/all.T
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<h4>Changes:</h4>
<li id="c51feff1097e886121a45f5d4b0baf4d9793d59e">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/041960356df883d5883f973acefe44f15b678f4e#c51feff1097e886121a45f5d4b0baf4d9793d59e"><strong>compiler/coreSyn/CoreSyn.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">@@ -445,6 +445,9 @@ which will generate a @case@ if necessary</td>
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<pre style="margin: 0;"> <span id="LC445" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The let/app invariant is initially enforced by mkCoreLet and mkCoreApp in</span></span>
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446
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<pre style="margin: 0;"> <span id="LC446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">coreSyn/MkCore.</span></span>
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447
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<pre style="margin: 0;"> <span id="LC447" class="line" lang="haskell"></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;">For discussion of some implications of the let/app invariant primops see</span></span>
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<pre style="margin: 0;">+<span id="LC449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Checking versus non-checking primops] in PrimOp.</span></span>
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<pre style="margin: 0;">+<span id="LC450" class="line" lang="haskell"></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;">Note [CoreSyn type and coercion invariant]</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;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We allow a /non-recursive/, /non-top-level/ let to bind type and</span></span>
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<li id="844514241b3e1a009f66bf594cbb57fef61482fb">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/041960356df883d5883f973acefe44f15b678f4e#844514241b3e1a009f66bf594cbb57fef61482fb"><strong>compiler/prelude/PrelRules.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">@@ -475,8 +475,7 @@ shiftRule shift_op</td>
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<pre style="margin: 0;"> <span id="LC475" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">e1</span></span>
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<pre style="margin: 0;"> <span id="LC476" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Guarding against silly shifts]</span></span>
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<pre style="margin: 0;"> <span id="LC477" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">shift_len</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">shift_len</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">wordSizeInBits</span> <span class="n" style="color: #333;">dflags</span></span>
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<pre style="margin: 0;">-<span id="LC478" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkRuntimeErrorApp</span> <span class="n" style="color: #333;">rUNTIME_ERROR_ID</span> <span class="n" style="color: #333;">wordPrimTy</span></span>
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<pre style="margin: 0;">-<span id="LC479" class="line" lang="haskell"> <span class="p">(</span><span class="s" style="color: #d14;">"Bad shift length "</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">shift_len</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC478" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Lit</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkLitNumberWrap</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">LitNumInt</span> <span class="mi" style="color: #099;">0</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">e1</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC479" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC480" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do the shift at type Integer, but shift length is Int</span></span>
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<pre style="margin: 0;"> <span id="LC481" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Lit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LitNumber</span> <span class="n" style="color: #333;">nt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">t</span><span class="p">)</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">@@ -701,7 +700,27 @@ can't constant fold it, but if it gets to the assember we get</td>
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Error: operand type mismatch for `shl'</span></span>
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"></span>
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702
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So the best thing to do is to rewrite the shift with a call to error,</span></span>
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<pre style="margin: 0;">-<span id="LC704" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">when the second arg is stupid.</span></span>
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<pre style="margin: 0;">+<span id="LC703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">when the second arg is large. However, in general we cannot do this; consider</span></span>
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<pre style="margin: 0;">+<span id="LC704" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">this case</span></span>
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<pre style="margin: 0;">+<span id="LC705" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let x = I# (uncheckedIShiftL# n 80)</span></span>
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<pre style="margin: 0;">+<span id="LC707" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in ...</span></span>
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<pre style="margin: 0;">+<span id="LC708" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here x contains an invalid shift and consequently we would like to rewrite it</span></span>
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<pre style="margin: 0;">+<span id="LC710" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">as follows:</span></span>
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<pre style="margin: 0;">+<span id="LC711" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC712" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let x = I# (error "invalid shift)</span></span>
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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in ...</span></span>
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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC715" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This was originally done in the fix to #16449 but this breaks the let/app</span></span>
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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">invariant (see Note [CoreSyn let/app invariant] in CoreSyn) as noted in #16742.</span></span>
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For the reasons discussed in Note [Checking versus non-checking primops] (in</span></span>
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the PrimOp module) there is no safe way rewrite the argument of I# such that</span></span>
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719
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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it bottoms.</span></span>
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consequently we instead take advantage of the fact that large shifts are</span></span>
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<pre style="margin: 0;">+<span id="LC722" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">undefined behavior (see associated documentation in primops.txt.pp) and</span></span>
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<pre style="margin: 0;">+<span id="LC723" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">transform the invalid shift into an "obviously incorrect" value.</span></span>
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<pre style="margin: 0;"> <span id="LC724" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC725" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are two cases:</span></span>
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<pre style="margin: 0;"> <span id="LC726" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/041960356df883d5883f973acefe44f15b678f4e#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">@@ -304,6 +304,27 @@ primOpOutOfLine :: PrimOp -> Bool</td>
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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>
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<pre style="margin: 0;">+<span id="LC307" 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="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>
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<pre style="margin: 0;">+<span id="LC310" 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="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;"> a. Checking primops behave, for instance, like division. In this</span></span>
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<pre style="margin: 0;">+<span id="LC313" 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="LC314" 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="LC315" 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="LC316" class="line" lang="haskell"></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;"> b. Non-checking primops behavior, for instance, like addition. While</span></span>
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<pre style="margin: 0;">+<span id="LC318" 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="LC319" 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="LC320" 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="LC321" class="line" lang="haskell"></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;"> 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="LC323" 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="LC324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (see Note [CoreSyn let/app invariant] in CoreSyn) which is critical to</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;"> 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 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="LC329" 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="LC330" 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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<a href="https://gitlab.haskell.org/ghc/ghc/commit/041960356df883d5883f973acefe44f15b678f4e#4d59cf0c96c12a05bf8356f74fc6e243511066d1"><strong>testsuite/tests/codeGen/should_run/T16449_2.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">@@ -5,5 +5,9 @@ module Main where</td>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prim</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Int</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Test that large unchecked shifts, which constitute undefined behavior, do</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- not crash the compiler and instead evaluate to 0.</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Guarding against silly shifts] in PrelRules.</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Shift should be larger than the word size (e.g. 64 on 64-bit) for this test.</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">uncheckedIShiftL</span><span class="o" style="font-weight: 600;">#</span> <span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span> <span class="mi" style="color: #099;">1000</span><span class="o" style="font-weight: 600;">#</span><span class="p">))</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/041960356df883d5883f973acefe44f15b678f4e#fc71411b980ba2e43ce1a3ea8b896057e74537a6"><strong>testsuite/tests/codeGen/should_run/T16449_2.stderr</strong>
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<pre style="margin: 0;">-<span id="LC1" class="line" lang="plaintext">T16449_2: Bad shift length 1000</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/041960356df883d5883f973acefe44f15b678f4e#dcb5ec3e55deda44707a5d082c7fdf480e4947c3"><strong>testsuite/tests/codeGen/should_run/T16449_2.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">0</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext"></span></pre>
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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">@@ -196,4 +196,4 @@ test('T15892',</td>
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<pre style="margin: 0;"> <span id="LC196" class="line" lang="perl"> <span class="nv" style="color: #008080;">extra_run_opts</span><span class="p">(</span><span class="s" style="color: #d14;">'+RTS -G1 -A32k -RTS'</span><span class="p">)</span> <span class="p">],</span></span>
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197
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197
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="perl"> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">'-O'</span><span class="p">])</span></span>
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198
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198
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16617'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16449_2'</span><span class="p">,</span> <span class="nv" style="color: #008080;">exit_code</span><span class="p">(</span><span class="mi" style="color: #099;"><span class="idiff left right">1</span></span><span class="p">),</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span></pre>
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16449_2'</span><span class="p">,</span> <span class="nv" style="color: #008080;">exit_code</span><span class="p">(</span><span class="mi" style="color: #099;"><span class="idiff left right">0</span></span><span class="p">),</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span></pre>
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