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LibJS: Add fast paths in TypedArrayPrototype.fill()
Filling a typed array with an integer shouldn't have to go through the generic Set for every element. This knocks a 7% item down to <1% in profiles of Another World JS at https://cyxx.github.io/another_js/
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d79353a477
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6f5201b759
Notes:
sideshowbarker
2024-07-17 03:10:07 +09:00
Author: https://github.com/awesomekling Commit: https://github.com/SerenityOS/serenity/commit/6f5201b759 Pull-request: https://github.com/SerenityOS/serenity/pull/24314
@ -469,6 +469,34 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::every)
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return true;
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}
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// NOTE: This function assumes that the index is valid within the TypedArray,
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// and that the TypedArray is not detached.
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template<typename T>
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inline void fast_typed_array_fill(TypedArrayBase& typed_array, u32 begin, u32 end, T value)
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{
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Checked<size_t> computed_begin = begin;
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computed_begin *= sizeof(T);
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computed_begin += typed_array.byte_offset();
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Checked<size_t> computed_end = end;
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computed_end *= sizeof(T);
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computed_end += typed_array.byte_offset();
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if (computed_begin.has_overflow() || computed_end.has_overflow()) [[unlikely]] {
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return;
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}
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if (computed_begin.value() >= typed_array.viewed_array_buffer()->byte_length()
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|| computed_end.value() > typed_array.viewed_array_buffer()->byte_length()) [[unlikely]] {
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return;
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}
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auto& array_buffer = *typed_array.viewed_array_buffer();
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auto* slot = reinterpret_cast<T*>(array_buffer.buffer().offset_pointer(computed_begin.value()));
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for (auto i = begin; i < end; ++i)
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*(slot++) = value;
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}
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// 23.2.3.9 %TypedArray%.prototype.fill ( value [ , start [ , end ] ] ), https://tc39.es/ecma262/#sec-%typedarray%.prototype.fill
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JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::fill)
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{
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@ -537,13 +565,48 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::fill)
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// 17. Set final to min(final, len).
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final = min(final, length);
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if (value.is_int32()) {
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switch (typed_array->kind()) {
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case TypedArrayBase::Kind::Uint8Array:
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fast_typed_array_fill<u8>(*typed_array, k, final, static_cast<u8>(value.as_i32()));
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return typed_array;
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case TypedArrayBase::Kind::Uint16Array:
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fast_typed_array_fill<u16>(*typed_array, k, final, static_cast<u16>(value.as_i32()));
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return typed_array;
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case TypedArrayBase::Kind::Uint32Array:
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fast_typed_array_fill<u32>(*typed_array, k, final, static_cast<u32>(value.as_i32()));
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return typed_array;
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case TypedArrayBase::Kind::Int8Array:
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fast_typed_array_fill<i8>(*typed_array, k, final, static_cast<i8>(value.as_i32()));
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return typed_array;
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case TypedArrayBase::Kind::Int16Array:
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fast_typed_array_fill<i16>(*typed_array, k, final, static_cast<i16>(value.as_i32()));
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return typed_array;
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case TypedArrayBase::Kind::Int32Array:
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fast_typed_array_fill<i32>(*typed_array, k, final, value.as_i32());
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return typed_array;
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case TypedArrayBase::Kind::Uint8ClampedArray:
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fast_typed_array_fill<u8>(*typed_array, k, final, clamp(value.as_i32(), 0, 255));
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return typed_array;
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default:
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// FIXME: Support more TypedArray kinds.
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break;
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}
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}
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// 18. Repeat, while k < final,
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while (k < final) {
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// a. Let Pk be ! ToString(𝔽(k)).
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PropertyKey property_key { k };
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// b. Perform ! Set(O, Pk, value, true).
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MUST(typed_array->set(property_key, value, Object::ShouldThrowExceptions::Yes));
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CanonicalIndex canonical_index { CanonicalIndex::Type::Index, k };
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switch (typed_array->kind()) {
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#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName, Type) \
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case TypedArrayBase::Kind::ClassName: \
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(void)typed_array_set_element<Type>(*typed_array, canonical_index, value); \
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break;
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JS_ENUMERATE_TYPED_ARRAYS
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#undef __JS_ENUMERATE
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}
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// c. Set k to k + 1.
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++k;
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