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Some minor perf improvements #16941

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Some minor perf improvements #16941

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nojaf
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@nojaf nojaf commented Mar 23, 2024

Description

Some things that got detected by the work happening in ionide/ionide-analyzers#85

Checklist

  • Test cases added

  • Performance benchmarks added in case of performance changes

  • Release notes entry updated:

    Please make sure to add an entry with short succinct description of the change as well as link to this pull request to the respective release notes file, if applicable.

    Release notes files:

    • If anything under src/Compiler has been changed, please make sure to make an entry in docs/release-notes/.FSharp.Compiler.Service/<version>.md, where <version> is usually "highest" one, e.g. 42.8.200
    • If language feature was added (i.e. LanguageFeatures.fsi was changed), please add it to docs/releae-notes/.Language/preview.md
    • If a change to FSharp.Core was made, please make sure to edit docs/release-notes/.FSharp.Core/<version>.md where version is "highest" one, e.g. 8.0.200.

    Information about the release notes entries format can be found in the documentation.
    Example:

    If you believe that release notes are not necessary for this PR, please add NO_RELEASE_NOTES label to the pull request.

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❗ Release notes required

@nojaf,

Caution

No release notes found for the changed paths (see table below).

Please make sure to add an entry with an informative description of the change as well as link to this pull request, issue and language suggestion if applicable. Release notes for this repository are based on Keep A Changelog format.

The following format is recommended for this repository:

* <Informative description>. ([PR #XXXXX](https://github.com/dotnet/fsharp/pull/XXXXX))

See examples in the files, listed in the table below or in th full documentation at https://fsharp.github.io/fsharp-compiler-docs/release-notes/About.html.

If you believe that release notes are not necessary for this PR, please add NO_RELEASE_NOTES label to the pull request.

You can open this PR in browser to add release notes: open in github.dev

Change path Release notes path Description
src/Compiler docs/release-notes/.FSharp.Compiler.Service/8.0.300.md No release notes found or release notes format is not correct

majocha
majocha reviewed Mar 23, 2024
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src/Compiler/AbstractIL/ilwrite.fs
@@ -3215,7 +3215,7 @@ let count f arr =
module FileSystemUtilities =
open System.Reflection
open System.Globalization
let progress = try Environment.GetEnvironmentVariable("FSharp_DebugSetFilePermissions") <> null with _ -> false
let progress = try not (isNull (Environment.GetEnvironmentVariable("FSharp_DebugSetFilePermissions"))) with _ -> false
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isNotNull ?

fsharp/src/Compiler/Utilities/illib.fs

Line 88 in 890e6e1

let inline isNotNull (x: 'T) = not (isNull x)

vzarytovskii
vzarytovskii reviewed Mar 23, 2024
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src/Compiler/Driver/CreateILModule.fs
@@ -54,11 +54,12 @@ module AttributeHelpers =
| Some(Attrib(_, _, [ AttribBoolArg p ], _, _, _, _)) -> Some p
| _ -> None

[<return: Struct>]
let (|ILVersion|_|) (versionString: string) =
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These are covered in @psfinaki PR likely, and we decided to wait with changes for a bit, since we already have some SO reports in compiler and those need careful verification.

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#16822

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Reason to postpone it is here: #16316 (comment)
There were stackoverflows when allocating more things on stack in certain cases. We will need to make sure we aren't hitting (or won't be hitting) it with AP changes.

@nojaf nojaf closed this Apr 8, 2024
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