From 37b5c05ec5679710adcd0464c180c429d3ee7f1f Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sun, 10 Dec 2023 11:53:24 +0100
Subject: [PATCH] LibJS: Add fast path for Uint8ClampedArray Get/Put

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/ :^)
---
 Userland/Libraries/LibJS/Bytecode/CommonImplementations.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Userland/Libraries/LibJS/Bytecode/CommonImplementations.cpp b/Userland/Libraries/LibJS/Bytecode/CommonImplementations.cpp
index a62a4f9567..38a1e8e6c4 100644
--- a/Userland/Libraries/LibJS/Bytecode/CommonImplementations.cpp
+++ b/Userland/Libraries/LibJS/Bytecode/CommonImplementations.cpp
@@ -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;