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LibJS: Add fast path for Uint8ClampedArray Get/Put

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These are just like Uint8Array, except Put values have to be clamped
in the 0..255 range.

Takes CPU usage from 40% to 30% on the "Canvas Cycle" demo at
http://www.effectgames.com/demos/canvascycle/ :^)
This commit is contained in:
Andreas Kling 2023-12-10 11:53:24 +01:00
parent 7abb182fa3
commit 37b5c05ec5
1 changed files with 5 additions and 0 deletions
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5
Userland/Libraries/LibJS/Bytecode/CommonImplementations.cpp
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@ -135,6 +135,8 @@ ThrowCompletionOr<Value> get_by_value(VM& vm, Value base_value, Value property_k
return fast_integer_indexed_element_get<i16>(typed_array, index);
case TypedArrayBase::Kind::Int32Array:
return fast_integer_indexed_element_get<i32>(typed_array, index);
case TypedArrayBase::Kind::Uint8ClampedArray:
return fast_integer_indexed_element_get<u8>(typed_array, index);
default:
// FIXME: Support more TypedArray kinds.
break;
@ -423,6 +425,9 @@ ThrowCompletionOr<void> put_by_value(VM& vm, Value base, Value property_key_valu
case TypedArrayBase::Kind::Int32Array:
fast_integer_indexed_element_set<i32>(typed_array, index, value.as_i32());
return {};
case TypedArrayBase::Kind::Uint8ClampedArray:
fast_integer_indexed_element_set<u8>(typed_array, index, clamp(value.as_i32(), 0, 255));
return {};
default:
// FIXME: Support more TypedArray kinds.
break;