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Use move_memory in std Array#unshift

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dcodeIO
2018-01-14 02:41:13 +01:00
parent ad469ca445
commit 827bb4afe8
4 changed files with 167 additions and 3290 deletions
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23
std/assembly/array.ts
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@ -71,16 +71,19 @@ export class Array<T> {
unshift(element: T): i32 {
var oldCapacity = this.__capacity;
if (<u32>this.length >= oldCapacity)
this.__grow(max(this.length + 1, oldCapacity * 2));
// FIXME: this is inefficient because of two copies, one in __grow and one here
// move_memory(this.__memory + sizeof<T>(), this.__memory, oldCapacity * sizeof<T>());
if (oldCapacity)
for (var index: usize = oldCapacity; index > 0; --index)
store<T>(this.__memory + index * sizeof<T>(), load<T>(this.__memory + (index - 1) * sizeof<T>()));
if (<u32>this.length >= oldCapacity) {
// inlined `this.__grow(max(this.length + 1, oldCapacity * 2))` (avoids moving twice)
var newCapacity = max(this.length + 1, oldCapacity * 2);
assert(newCapacity > this.__capacity);
var newMemory = allocate_memory(<usize>newCapacity * sizeof<T>());
if (this.__memory) {
move_memory(newMemory + sizeof<T>(), this.__memory, oldCapacity * sizeof<T>());
free_memory(this.__memory);
}
this.__memory = newMemory;
this.__capacity = newCapacity;
} else
move_memory(this.__memory + sizeof<T>(), this.__memory, oldCapacity * sizeof<T>());
store<T>(this.__memory, element);
return ++this.length;
}