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‎cppcon2025/cppcon_2025_slides.md‎

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![bg right](images/avx.jpeg)
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# SIMD Support in simdjson
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* x64: SSSE3 (128-bit), AVX-2 (256-bit), AVX-512 (512-bit)
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![bg right 90%](images/simdjsondesign.png)
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# simdjson: Design
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* First scan identifies the structural characters, start of all strings at about 10 GB/s using SIMD instructions.
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* Validates Unicode (UTF-8) at 30 GB/s.
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* Rest of parsing relies on the generated index.
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# When Your Game Grows...
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```cpp
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```
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<img src="images/happy_programmer.jpg">
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# Happy programmer...
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![bg right](images/happy_programmer.jpg)
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‎cppcon2025/images/avx.jpeg‎

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‎cppcon2025/images/simdjsondesign.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Styled JSON Display</title>
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<style>
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body {
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font-family: 'Arial', sans-serif;
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background-color: #f4f4f9;
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display: flex;
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justify-content: center;
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align-items: center;
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min-height: 100vh;
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margin: 0;
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padding: 20px;
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}
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pre {
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background-color: #ffffff;
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border-radius: 12px;
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padding: 20px;
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box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
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max-width: 600px;
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width: 100%;
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font-size: 16px;
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line-height: 1.5;
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overflow-x: auto;
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border: 1px solid #e0e0e0;
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}
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.json-key {
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color: #2c3e50;
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font-weight: bold;
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text-decoration: underline;
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}
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.json-string {
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color: #e74c3c;
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}
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.json-number {
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color: #2980b9;
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}
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.json-bracket {
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color: #8e44ad;
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font-weight: bold;
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text-decoration: underline;
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}
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.boxed {
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border: 1px solid #333;
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padding: 1px 3px;
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border-radius: 3px;
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display: inline-block;
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line-height: 1;
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}
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.string-start {
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position: relative;
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}
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.number-start::before {
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content: attr(data-first-digit);
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border: 1px solid #333;
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padding: 1px 3px;
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border-radius: 3px;
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display: inline-block;
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line-height: 1;
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}
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.number-start {
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position: relative;
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}
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</style>
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</head>
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<body>
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<pre>
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<span class="json-bracket boxed">{</span>
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<span class="json-key"><span class="boxed json-string">"</span>nom"</span><span class="boxed">:</span> <span class="string-start json-string"><span class="boxed json-string">"</span>Marie Dubois"</span><span class="boxed">,</span>
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<span class="json-key"><span class="boxed json-string">"</span>age"</span><span class="boxed">:</span> <span class="json-number number-start" data-first-digit="2">28</span><span class="boxed">,</span>
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<span class="json-key"><span class="boxed json-string">"</span>ville"</span><span class="boxed">:</span> <span class="string-start json-string"><span class="boxed json-string">"</span>Paris"</span><span class="boxed">,</span>
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<span class="json-key"><span class="boxed json-string">"</span>loisirs"</span><span class="boxed">:</span> <span class="json-bracket boxed">[</span><span class="string-start json-string"><span class="boxed json-string">"</span>lecture"</span><span class="boxed">,</span> <span class="string-start json-string"><span class="boxed json-string">"</span>voyage"</span><span class="boxed">,</span> <span class="string-start json-string"><span class="boxed json-string">"</span>yoga"</span><span class="json-bracket boxed">]</span><span class="boxed">,</span>
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<span class="json-key"><span class="boxed json-string">"</span>contact"</span><span class="boxed">:</span> <span class="json-bracket boxed">{</span>
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<span class="json-key"><span class="boxed json-string">"</span>email"</span><span class="boxed">:</span> <span class="string-start json-string"><span class="boxed json-string">"</span>[email protected]"</span><span class="boxed">,</span>
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<span class="json-key"><span class="boxed json-string">"</span>phone"</span><span class="boxed">:</span> <span class="string-start json-string"><span class="boxed json-string">"</span>+33123456789"</span>
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<span class="json-bracket boxed">}</span>
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<span class="json-bracket boxed">}</span>
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</pre>
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</body>
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</html>

‎cppcon2025/images/simdjsondesign.png‎

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