Constant folding improvements #3466
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dottybot
reviewed
Nov 13, 2017
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if(!e) { a } else { b } is now transformed into if(e) { b } else { a }
This case was intentionally not included.
On benchmarking that I did for original optimization this stopped branches
from being merged by further optimizations
…On 13 November 2017 08:05:19 gan_ ***@***.***> wrote:
Expressions with constant type are now folded correctly.
ConstantFold doesn't call typer's `ConstFold.apply` on every expression
making it faster.
`if(!e) { a } else { b }` is now transformed into `if(e) { b } else { a }`
You can view, comment on, or merge this pull request online at:
#3466
-- Commit Summary --
* Merge remote-tracking branch 'origin/const-fold' into wip-local-opt
-- File Changes --
M compiler/src/dotty/tools/dotc/transform/localopt/ConstantFold.scala (38)
M compiler/test/dotty/tools/dotc/SimplifyTests.scala (62)
-- Patch Links --
https://github.com/lampepfl/dotty/pull/3466.patch
https://github.com/lampepfl/dotty/pull/3466.diff
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#3466
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| @@ -76,9 +77,6 @@ import Simplify.desugarIdent | |||
| // cond.select(defn.Boolean_&&).appliedTo(elsep) | |||
| // the other case ins't handled intentionally. See previous case for explanation | |||
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| case If(t @ Select(recv, _), thenp, elsep) if t.symbol eq defn.Boolean_! => | |||
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I'm confused, in the PR description you say that if(!e) { a } else { b } now if(e) { b } else { a }, but it seams that you just removed the case doing that... Could you had a test for this example?
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Hi, I looked into it: you are right. It's an error on my part, I didn't add the feature, I only added documentation for it.
Sorry or the confusion...
Expressions with constant type are now folded correctly. ConstantFold doesn't call typer's ConstFold.apply on every expression making it faster
gan74
changed the title
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Expressions with constant type are now folded correctly.
ConstantFold doesn't call typer's
ConstFold.applyon every expression making it faster.if(!e) { a } else { b }is now transformed intoif(e) { b } else { a }