sumtype: reduce template overhead of match #9087
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Tuples with the same dimensions now share a single instantiation, regardless of the types held by the SumTypes they are used for.
Calls to matchImpl whose SumType arguments have the same dimensions will now share instantiations, instead of having separate ones.
This reduces the number of templates instantiated by matchImpl in the common case where only one SumType is being matched on.
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Thanks for your pull request and interest in making D better, @pbackus! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.
Please see CONTRIBUTING.md for more information. If you have addressed all reviews or aren't sure how to proceed, don't hesitate to ping us with a simple comment. Bugzilla referencesYour PR doesn't reference any Bugzilla issue. If your PR contains non-trivial changes, please reference a Bugzilla issue or create a manual changelog. Testing this PR locallyIf you don't have a local development environment setup, you can use Digger to test this PR: dub run digger -- build "master + phobos#9087" |
thewilsonator
approved these changes
Nov 20, 2024
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Please review this PR commit-by-commit.
The changes in this PR can be grouped into two categories:
matchImplto eliminate unnecessary instantiations.matchImpl.Altogether, these changes reduce the time take to run
std.sumtype's test suite by about 14%.See also pbackus/sumtype#91, which added these changes to the dub version of
sumtype.Before
../dmd/generated/linux/release/64/dmd -conf= -I../dmd/druntime/import -w -preview=dip1000 -preview=dtorfields -preview=fieldwise -m64 -fPIC -O -release -main -unittest -version=StdUnittest generated/linux/release/64/libphobos2.a -defaultlib= -debuglib= -L-lpthread -L-lm -L-ldl -cov=ctfe -run std/sumtype.dAfter
../dmd/generated/linux/release/64/dmd -conf= -I../dmd/druntime/import -w -preview=dip1000 -preview=dtorfields -preview=fieldwise -m64 -fPIC -O -release -main -unittest -version=StdUnittest generated/linux/release/64/libphobos2.a -defaultlib= -debuglib= -L-lpthread -L-lm -L-ldl -cov=ctfe -run std/sumtype.d