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author | sterni <sternenseemann@systemli.org> | 2022-09-06T19·39+0200 |
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committer | clbot <clbot@tvl.fyi> | 2022-09-11T20·02+0000 |
commit | b6ab02e48bf9e852f495a01d79fc97a1409e0a8b (patch) | |
tree | 3b7fef87addc9483da71def94dbb81f5d0e7e5ad /tvix | |
parent | cbde0292b6d029b54cf4d8ef413a6f68adbb9acf (diff) |
docs(tvix/eval): propose builtin "inlining" optimisation r/4821
Change-Id: I96a187792a1fd48cffd6b56ec22347aee8cae3af Reviewed-on: https://cl.tvl.fyi/c/depot/+/6526 Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
Diffstat (limited to 'tvix')
-rw-r--r-- | tvix/eval/docs/known-optimisation-potential.md | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/tvix/eval/docs/known-optimisation-potential.md b/tvix/eval/docs/known-optimisation-potential.md index fad773d7da63..9390e8c601fa 100644 --- a/tvix/eval/docs/known-optimisation-potential.md +++ b/tvix/eval/docs/known-optimisation-potential.md @@ -62,6 +62,24 @@ optimisations, but note the most important ones here. The same thing goes for resolving `with builtins;`, which should definitely resolve statically. +* Inline fully applied builtins with equivalent operators [medium] + + Some `builtins` have equivalent operators, e.g. `builtins.add` + corresponds to the `+` operator, `builtins.hasAttr` to the `?` + operator etc. These operators additionally compile to a primitive + VM opcode, so they should be just as cheap (if not cheaper) as + a builtin application. + + In case the compiler encounters a fully applied builtin (i.e. + no currying is occurring) and the `builtins` global is unpoisoned, + it could compile the equivalent operator bytecode instead: For + example, `builtins.add 20 22` would be compiled as `20 + 22`. + This would ensure that equivalent `builtins` can also benefit + from special optimisations we may implement for certain operators + (in the absence of currying). E.g. we could optimise access + to the `builtins` attribute set which a call to + `builtins.getAttr "foo" builtins` should also profit from. + * Avoid nested `VM::run` calls [hard] Currently when encountering Nix-native callables (thunks, closures) |