# SIMD-accelerated integer-to-string conversion

DevFeed: [SIMD-accelerated integer-to-string conversion](<https://devfeed.tech/articles/simd-accelerated-integer-to-string-conversion-29406.md>)

Original publisher: [Read original article](<https://lemire.me/blog/2026/05/18/simd-accelerated-integer-to-string-conversion/>)

Author: Daniel Lemire

Published: 2026-05-18T19:39:49Z

Content type: article

Language: en

Sources: [Daniel Lemire](<https://devfeed.tech/sources/daniel-lemire.md>)

Topics: [C++](<https://devfeed.tech/topics/c-plus-plus.md>), [cpu](<https://devfeed.tech/topics/cpu.md>), [Compiler](<https://devfeed.tech/topics/compiler.md>), [Logging](<https://devfeed.tech/topics/logging.md>)

Tags: [amd](<https://devfeed.tech/tags/amd.md>), [avx](<https://devfeed.tech/tags/avx.md>), [c-plus-plus](<https://devfeed.tech/tags/c-plus-plus.md>), [compiler](<https://devfeed.tech/tags/compiler.md>), [csv](<https://devfeed.tech/tags/csv.md>), [intel](<https://devfeed.tech/tags/intel.md>), [json](<https://devfeed.tech/tags/json.md>), [logging](<https://devfeed.tech/tags/logging.md>), [performance](<https://devfeed.tech/tags/performance.md>)

## AI overview

This article explains SIMD-based techniques for converting 64-bit integers to decimal strings. It describes division and lookup-table approaches, then discusses using AVX-512 and IFMA instructions on recent AMD and Intel processors to process multiple values in parallel.

## Source excerpt

Converting a 64-bit integer to its decimal string representation is a mundane task that shows up everywhere: logging, JSON serialization, CSV output, debug prints, etc. In C++, you might use std::to_chars, sprintf, or some library routine. How do these functions work? At a high level, they repeatedly divide by ten. Start with your integer k. ... Continue reading SIMD-accelerated integer-to-string conversion