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<h3>
Sebastian Graf pushed to branch wip/mod-rem-strict
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8129df947eec0d4f803fb8bdb3cfc4a7088ba2fd">8129df94</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-05-15T12:58:18+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make `Int`'s `mod` and `rem` strict in their first arguments
They used to be strict until 4d2ac2d (9 years ago).
It's obviously better to be strict for performance reasons.
It also blocks #18067.
NoFib results:
```
--------------------------------------------------------------------------------
Program Allocs Instrs
--------------------------------------------------------------------------------
integer -1.1% +0.4%
wheel-sieve2 +21.2% +20.7%
--------------------------------------------------------------------------------
Min -1.1% -0.0%
Max +21.2% +20.7%
Geometric Mean +0.2% +0.2%
```
The regression in `wheel-sieve2` is due to reboxing that likely will go
away with the resolution of #18067. See !3282 for details.
Fixes #18187.
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<h4>1 changed file:</h4>
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<a href="#13051caa3e90fdf52d8cd971a61ab47ad07c105f">
libraries/base/GHC/Real.hs
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<h4>Changes:</h4>
<li id="13051caa3e90fdf52d8cd971a61ab47ad07c105f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8129df947eec0d4f803fb8bdb3cfc4a7088ba2fd#13051caa3e90fdf52d8cd971a61ab47ad07c105f"><strong>libraries/base/GHC/Real.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">@@ -334,11 +334,8 @@ instance Integral Int where</td>
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Int</span></span>
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<pre style="margin: 0;"> <span id="LC335" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span> <span class="p">`</span><span class="n" style="color: #333;">quotInt</span><span class="p">`</span> <span class="n" style="color: #333;">b</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="n" style="color: #333;"><span class="idiff left">a</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">rem</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">b</span></span></span>
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<pre style="margin: 0;">+<span id="LC337" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">!</span></span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">rem</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">b</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- See Note [Special case of mod and rem is lazy]</span></span></span>
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<pre style="margin: 0;"> <span id="LC338" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">b</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;">divZeroError</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;">-- The quotRem CPU instruction fails for minBound `quotRem` -1,</span></span>
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<pre style="margin: 0;">-<span id="LC340" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but minBound `rem` -1 is well-defined (0). We therefore</span></span>
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<pre style="margin: 0;">-<span id="LC341" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- special-case it.</span></span>
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<pre style="margin: 0;"> <span id="LC339" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">==</span> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;"> <span id="LC340" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span> <span class="p">`</span><span class="n" style="color: #333;">remInt</span><span class="p">`</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;"> <span id="LC341" class="line" lang="haskell"></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">@@ -348,11 +345,8 @@ instance Integral Int where</td>
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<pre style="margin: 0;"> <span id="LC345" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Int</span></span>
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<pre style="margin: 0;"> <span id="LC346" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span> <span class="p">`</span><span class="n" style="color: #333;">divInt</span><span class="p">`</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;"> <span id="LC347" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC351" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">a</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">mod</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">b</span></span></span>
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">!</span></span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">mod</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">b</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- See Note [Special case of mod and rem is lazy]</span></span></span>
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<pre style="margin: 0;"> <span id="LC349" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">b</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;">divZeroError</span></span>
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The divMod CPU instruction fails for minBound `divMod` -1,</span></span>
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<pre style="margin: 0;">-<span id="LC354" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but minBound `mod` -1 is well-defined (0). We therefore</span></span>
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<pre style="margin: 0;">-<span id="LC355" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- special-case it.</span></span>
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<pre style="margin: 0;"> <span id="LC350" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">==</span> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;"> <span id="LC351" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span> <span class="p">`</span><span class="n" style="color: #333;">modInt</span><span class="p">`</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;"> <span id="LC352" class="line" lang="haskell"></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">@@ -368,6 +362,15 @@ instance Integral Int where</td>
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<pre style="margin: 0;"> <span id="LC362" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">==</span> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">minBound</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">overflowError</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span> <span class="p">`</span><span class="n" style="color: #333;">divModInt</span><span class="p">`</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;"> <span id="LC364" class="line" lang="haskell"></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;">{- Note [Special case of mod and rem is lazy]</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;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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;">The `quotRem`/`divMod` CPU instruction fails for minBound `quotRem` -1, but</span></span>
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">minBound `rem` -1 is well-defined (0). We therefore special-case for `b == -1`,</span></span>
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but not for `a == minBound` because of Note [Order of tests] in GHC.Int. But</span></span>
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<pre style="margin: 0;">+<span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">now we have to make sure the function stays strict in a, to guarantee unboxing.</span></span>
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Hence the bang on a, see #18187.</span></span>
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<pre style="margin: 0;">+<span id="LC372" 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="LC373" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC375" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Instances for @Word@</span></span>
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------------------------------------------------------</span></span>
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