Allow effect inference of eltype(::Tuple)
#48322
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
By bumping max_methods for `eltype` slightly to cover all four Tuple methods.
|
Would this be generally useful? I mean, if this improvement is useful especially for some external |
|
Yes, it allowed inference to know that |
aviatesk
approved these changes
Jan 18, 2023
nsajko
added a commit
to nsajko/julia
that referenced
this pull request
Jun 21, 2025
The `eltype` function was one of the few functions in the sysimage with
a `max_methods` value (the world-splitting threshold) greater than the
default. This was a workaround for the unnecessarily large number of
methods of `eltype(::Type{<:Tuple})`. The `max_methods` value was
increased in PR JuliaLang#48322 to help effect inference.
Reduce the number of `eltype(::Type{<:Tuple})` methods, which then also
allows keeping the `max_methods` for `eltype` at the default value.
The intent here is to guard against unnecessary invalidation of the
sysimage or other precompiled code, which might require decreasing the
`max_methods` value to the natural minimum for many interface functions,
by which I mean "generic function meant to have methods added to it by
package authors". See also: PR JuliaLang#57884.
nsajko
added a commit
to nsajko/julia
that referenced
this pull request
Jun 21, 2025
The `eltype` function was one of the few functions in the sysimage with
a `max_methods` value (the world-splitting threshold) greater than the
default. This was a workaround for the unnecessarily large number of
methods of `eltype(::Type{<:Tuple})`. The `max_methods` value was
increased in PR JuliaLang#48322 to help effect inference.
Reduce the number of `eltype(::Type{<:Tuple})` methods, which then also
allows keeping the `max_methods` for `eltype` at the default value.
The intent here is to guard against unnecessary invalidation of the
sysimage or other precompiled code, which might require decreasing the
`max_methods` value to the natural minimum for many interface
functions, by which I mean "generic function meant to have methods
added to it by package authors". I intend to approach this issue in
following PRs. See also: PR JuliaLang#57884.
Regarding future work: I consider the "natural minimum" value for
interface functions taking types to be **two**, because the bottom type
subtypes each type. If the interface function doesn't accept types, the
natural minimum should be **one**.
nsajko
added a commit
to nsajko/julia
that referenced
this pull request
Jun 21, 2025
The `eltype` function was one of the few functions in the sysimage with
a `max_methods` value (the world-splitting threshold) greater than the
default. This was a workaround for the unnecessarily large number of
methods of `eltype(::Type{<:Tuple})`. The `max_methods` value was
increased in PR JuliaLang#48322 to help effect inference.
Reduce the number of `eltype(::Type{<:Tuple})` methods, which then also
allows keeping the `max_methods` for `eltype` at the default value.
The intent here is to guard against unnecessary invalidation of the
sysimage or other precompiled code, which might require decreasing the
`max_methods` value to the natural minimum for many interface
functions, by which I mean "generic function meant to have methods
added to it by package authors". I intend to approach this issue in
following PRs. See also: PR JuliaLang#57884.
Regarding future work: I consider the "natural minimum" value for
interface functions taking types to be **two**, because the bottom type
subtypes each type. If the interface function doesn't accept types, the
natural minimum should be **one**.
JeffBezanson
pushed a commit
that referenced
this pull request
Aug 28, 2025
#58788) The `eltype` function was one of the few functions in the sysimage with a `max_methods` value (the world-splitting threshold) greater than the default. This was a workaround for the unnecessarily large number of methods of `eltype(::Type{<:Tuple})`. The `max_methods` value was increased in PR #48322 to help effect inference.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
By bumping max_methods for
eltypeslightly to cover all four Tuple methods.