Micro-optimize push() and insert(). #315
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r? @mbrubeck |
This helps with some micro-benchmarks in Firefox where we end up pushing thousands of elements to a SmallVec. See https://treeherder.mozilla.org/perfherder/comparesubtest?originalProject=try&newProject=try&newRevision=78b672e152c65fbacd3f0bccc4bd069b177addd6&originalSignature=4765498&newSignature=4765498&framework=1&application=firefox&originalRevision=6f0164143af00325c9f15e7c6387d8f9c7993daf&page=1&showOnlyConfident=1
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Fixed MSRV, I think. |
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https://bugzilla.mozilla.org/show_bug.cgi?id=1853969 is the regression this addresses. |
dshin-moz
reviewed
Sep 20, 2023
| // so that the optimizer removes duplicated calls to it | ||
| // from callers like insert() | ||
| // prefer triple_mut() even if triple() would work so that the optimizer removes duplicated | ||
| // calls to it from callers. |
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So then, does this comment make sense anymore?
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Potentially? In code like:
vec.try_reserve(1)?;
vec.push(...);
It might still be useful / let the compiler optimize more.
mbrubeck
approved these changes
Sep 20, 2023
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Merged to the |
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This helps with some micro-benchmarks in Firefox where we end up pushing thousands of elements to a SmallVec.
See https://treeherder.mozilla.org/perfherder/comparesubtest?originalProject=try&newProject=try&newRevision=78b672e152c65fbacd3f0bccc4bd069b177addd6&originalSignature=4765498&newSignature=4765498&framework=1&application=firefox&originalRevision=6f0164143af00325c9f15e7c6387d8f9c7993daf&page=1&showOnlyConfident=1