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The wasm baseline compiler slows down significantly when compiling code that has extensive need of stack maps, for example the Dart-Barista benchmark. This is because StackMapGenerator::createStackMap spends a lot of time iterating over a vector of booleans, one element at a time, to identify reftyped stack slots. This patch gives `class MachineStackTracker` its own iterator class `Iter` to hide the details. This provides fast(er) iteration by scanning backwards through the vector of booleans until the scan-index becomes 8-aligned. After that, it jumps backwards in steps of 8 elements to the extent possible. For a --no-threads --wasm-compiler=baseline compilation only of Barista 3, this reduces compilation time from 0.110 to 0.082 user seconds (Intel Core i5 1135G7). Differential Revision: https://phabricator.services.mozilla.com/D167288 |
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| loader | ||
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| src | ||
| xpconnect | ||
| app.mozbuild | ||
| ffi.configure | ||
| moz.build | ||
| moz.configure | ||
| sub.configure | ||