perf(codegen): faster writing indentation #7820
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+1% perf gain. |
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I wrote this 6 weeks ago, but forgot to submit the PR! |
camc314
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Dec 12, 2024
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Write indentation faster. Previously was writing indentation to buffer with a call to `memset`, which is relatively expensive. Where indentation `<= 16` (common case), write 16 tabs with a single 16-byte XMM write, which is faster.
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## [0.41.0] - 2024-12-13 - fb325dc ast: [**BREAKING**] `span` field must be the first element (#7821) (Boshen) - 96a26d3 ast: [**BREAKING**] Rename `is_strict` methods to `has_use_strict_directive` (#7783) (overlookmotel) ### Features - 8991f33 ast: Add `visit_span` to `Visit` and `VisitMut` (#7816) (overlookmotel) - f7900ab ast: Add `ArrowFunctionExpression::has_use_strict_directive` method (#7784) (overlookmotel) - e727ae9 transformer/class-properties: Transform super member expressions that are inside static prop initializer (#7815) (Dunqing) ### Bug Fixes - 7610dc1 parser: Parse `import source from 'mod'` (#7833) (Boshen) - 9479e2b semantic: Missing references when `export {}` references a type-only binding and a normal (#7812) (Yunfei He) - 7a83230 semantic: Missing reference when `export default` references a type alias binding (#7813) (Dunqing) - 4a3bca8 semantic: Fix identifying strict mode arrow functions (#7785) (overlookmotel) - 5b7e1ad transformer: Remove span of define value (#7811) (Hiroshi Ogawa) - 14896cb transformer/class-properties: Create temp vars in correct scope (#7824) (overlookmotel) - 25bb6da transformer/class-properties: Fix `ScopeId`s in instance prop initializers (#7823) (overlookmotel) - 65b109a transformer/class-properties: No `raw` for generated `StringLiteral` (#7825) (overlookmotel) - 2964a61 transformer/class-properties: Unwrap failed when private field expression doesn't contain optional expression in `ChainExpression` (#7798) (Dunqing) - 6fa6785 transformer/class-properties: Panic when the callee or member is `ParenthesisExpression` or TS-syntax expressions. (#7795) (Dunqing) - bb22c67 transformer/class-properties: Fix `ScopeId`s in static prop initializers (#7791) (overlookmotel) - caa57f1 transformer/class-properties: Fix scope flags in static prop initializers (#7786) (overlookmotel) ### Performance - 4448b63 codegen: Faster writing indentation (#7820) (overlookmotel) - afaaffa codegen: Fast path for `options.print_comments()` (#7806) (Boshen) ### Refactor - 0f367e5 semantic: Improve the logic of resolving references to be cleaner (#7829) (Dunqing) - 5710950 semantic: Move export-related reference flags logic to visit functions (#7828) (Dunqing) - b290ebd transformer: Handle `<CWD>` in test runner (#7799) (Dunqing) - e70deb9 transformer/class-properties: Locate instance props insertion location in separate step (#7819) (overlookmotel) - afc5f1e transformer/class-properties: De-deduplicate code (#7805) (overlookmotel) - 47a91d2 transformer/class-properties: Shorten code (#7804) (overlookmotel) - 54ef2b9 transformer/class-properties: Rename `debug_assert_expr_is_not_parenthesis_or_typescript_syntax` (#7803) (overlookmotel) - 3cdc47c transformer/class-properties: `#[inline(always)]` on `assert_expr_neither_parenthesis_nor_typescript_syntax` (#7802) (overlookmotel) ### Testing - d72c888 transformer/replace-global-defines: Remove panicking test (#7838) (overlookmotel) Co-authored-by: Boshen <[email protected]>
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Write indentation faster. Previously was writing indentation to buffer with a call to
memset, which is relatively expensive. Where indentation<= 16(common case), write 16 tabs with a single 16-byte XMM write, which is faster.