From 2c01596b166decc5be1b05f73a2798653f9dc8b7 Mon Sep 17 00:00:00 2001 From: Paul Adenot Date: Wed, 9 Aug 2023 16:26:36 +0200 Subject: [PATCH] Use set(...) when possible to make copies faster This fixes #22. --- js/ringbuf.js | 13 +++++++++++++ public/example/index.js | 13 +++++++++++++ 2 files changed, 26 insertions(+) diff --git a/js/ringbuf.js b/js/ringbuf.js index 67171b8..851f9cb 100644 --- a/js/ringbuf.js +++ b/js/ringbuf.js @@ -344,6 +344,19 @@ export class RingBuffer { * @private */ _copy(input, offset_input, output, offset_output, size) { + if (!size) { + return; + } + // Fast-path: use `set(...)` if possible: copying all the input linearly to + // the output. + if ( + offset_input === 0 && + offset_output + input.length <= this._storage_capacity() && + input.length === size + ) { + output.set(input, offset_output); + return; + } for (let i = 0; i < size; i++) { output[offset_output + i] = input[offset_input + i]; } diff --git a/public/example/index.js b/public/example/index.js index 292397c..c34663a 100644 --- a/public/example/index.js +++ b/public/example/index.js @@ -596,6 +596,19 @@ class RingBuffer { * @private */ _copy(input, offset_input, output, offset_output, size) { + if (!size) { + return; + } + // Fast-path: use `set(...)` if possible: copying all the input linearly to + // the output. + if ( + offset_input === 0 && + offset_output + input.length <= this._storage_capacity() && + input.length === size + ) { + output.set(input, offset_output); + return; + } for (let i = 0; i < size; i++) { output[offset_output + i] = input[offset_input + i]; } pFad - Phonifier reborn

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