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Bug 1951338: Add fast path for packed elements in willBeSparseElements r=jandem

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I originally intended to reset the NON_PACKED flag in this code if there were no holes, but after a closer look, I realized that we exit early from the loop once we've seen enough non-holes, but resetting the flag would require us to examine every element.

Differential Revision: https://phabricator.services.mozilla.com/D241534
This commit is contained in:
Iain Ireland
2025-03-14 20:33:20 +00:00
parent 3d2e59c22e
commit 0a8be1129a
1 changed files with 6 additions and 2 deletions
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8
js/src/vm/NativeObject.cpp
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@@ -545,9 +545,13 @@ bool NativeObject::willBeSparseElements(uint32_t requiredCapacity,
return true;
}
uint32_t len = getDenseInitializedLength();
uint32_t initLen = getDenseInitializedLength();
if (denseElementsArePacked()) {
return minimalDenseCount > initLen;
}
const Value* elems = getDenseElements();
for (uint32_t i = 0; i < len; i++) {
for (uint32_t i = 0; i < initLen; i++) {
if (!elems[i].isMagic(JS_ELEMENTS_HOLE) && !--minimalDenseCount) {
return false;
}