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# What's Changed? We've been hard at work fixing bugs and introducing new features! ## VM * Include constant-folding information in Luau cost model for inlining and loop unrolling * ~1% improvement in compile times ## New Type Solver * `Luau::shallowClone`'s last argument, whether to clone persistent (builtin) types, is now non-optional. * Refinements on properties of tables are now computed with a `read` table property. This resolves some issues around refining table properies and then trying to set them. Fixes #1344. Fixes #1651. ``` if foo.bar then -- Prior to this release, this would be `typeof(foo) & { bar: ~(false?) } -- Now, this is `typeof(foo) & { read bar: ~(false?) } end ``` * The type function `keyof` should respect the empty string as a property, as in: ``` -- equivalent to type Foo ="" type Foo = keyof<{ [""]: number }> ``` * Descend into literals to report subtyping errors for function calls: this both improves bidirectional inference and makes errors more specific. Before, the error reporting for a table with incorrect members passed to a function would cite the entire table, but now it only cites the members that are incorrectly typed. * Fixes a case where intersecting two tables without any common properties would create `never`, instead of a table with both of their properties. # Internal Contributors Co-authored-by: Ariel Weiss <aaronweiss@roblox.com> Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com> Co-authored-by: James McNellis <jmcnellis@roblox.com> Co-authored-by: Sora Kanosue <skanosue@roblox.com> Co-authored-by: Talha Pathan <tpathan@roblox.com> Co-authored-by: Vighnesh Vijay <vvijay@roblox.com> Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com> --------- Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com> Co-authored-by: Varun Saini <61795485+vrn-sn@users.noreply.github.com> Co-authored-by: Alexander Youngblood <ayoungblood@roblox.com> Co-authored-by: Aviral Goel <agoel@roblox.com> Co-authored-by: Vighnesh <vvijay@roblox.com> Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com> Co-authored-by: Ariel Weiss <aaronweiss@roblox.com> Co-authored-by: Andy Friesen <afriesen@roblox.com>
32 lines
1.1 KiB
C++
32 lines
1.1 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#pragma once
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#include "Luau/Ast.h"
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#include "Luau/DenseHash.h"
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namespace Luau
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{
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namespace Compile
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{
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struct Constant;
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// cost model: 8 bytes, where first byte is the baseline cost, and the next 7 bytes are discounts for when variable #i is constant
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uint64_t modelCost(
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AstNode* root,
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AstLocal* const* vars,
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size_t varCount,
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const DenseHashMap<AstExprCall*, int>& builtins,
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const DenseHashMap<AstExpr*, Constant>& constants
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);
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// when additional data is not available, used to test the cost model
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uint64_t modelCost(AstNode* root, AstLocal* const* vars, size_t varCount);
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// cost is computed as B - sum(Di * Ci), where B is baseline cost, Di is the discount for each variable and Ci is 1 when variable #i is constant
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int computeCost(uint64_t model, const bool* varsConst, size_t varCount);
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// get loop trip count or -1 if we can't compute it precisely
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int getTripCount(double from, double to, double step);
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} // namespace Compile
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} // namespace Luau
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