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Auto merge of #18281 - emilio:more-parse-dumbness, r=jdm

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style: Avoid scanning the longhand id twice in the fast path of PropertyDeclarationBlock::parse_common

This makes the overhead of this function much lower according to `perf`.

And in general makes sense, removing overhead from the fast path.

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This commit is contained in:
bors-servo 2017-08-29 02:48:09 -05:00 • committed by GitHub
commit bd9cf3ce98
1 changed files with 7 additions and 5 deletions
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12
components/style/properties/declaration_block.rs
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@ -397,12 +397,14 @@ impl PropertyDeclarationBlock {
importance: Importance,
overwrite_more_important_and_reuse_slot: bool
) -> bool {
let definitely_new = if let PropertyDeclarationId::Longhand(id) = declaration.id() {
!self.longhands.contains(id)
} else {
false // For custom properties, always scan
let longhand_id = match declaration.id() {
PropertyDeclarationId::Longhand(id) => Some(id),
PropertyDeclarationId::Custom(..) => None,
};
let definitely_new = longhand_id.map_or(false, |id| {
!self.longhands.contains(id)
});
if !definitely_new {
let mut index_to_remove = None;
@ -444,7 +446,7 @@ impl PropertyDeclarationBlock {
}
}
if let PropertyDeclarationId::Longhand(id) = declaration.id() {
if let Some(id) = longhand_id {
self.longhands.insert(id);
}
self.declarations.push((declaration, importance));