LLVM #5 — Mutable Variables
The article discusses the addition of mutable variables to the Kaleidoscope language within the LLVM framework. It explains the challenges of maintaining SSA form while allowing variable mutation and introduces a solution involving memory management techniques. The process includes creating memory addresses for variables and using a lifting pass to optimize performance by replacing memory accesses with CPU registers.
- ▪Kaleidoscope previously only supported immutable variables, limiting its functionality.
- ▪The article introduces the ability to mutate variables and define new local variables.
- ▪LLVM's mem2reg pass optimizes memory usage by replacing memory accesses with high-speed CPU registers.
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| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/lahari_tenneti_4a8a082e9c/llvm-5-mutable-variables-ppg |
| Publication time | Mon, 18 May 2026 09:40:38 +0000 |
| Retrieval time | 2026-05-18T10:04:56.157Z |
| Last seen | 2026-05-18T10:04:56.157Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | KUyYRhM6yFgf |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
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| Publisher visit | Yes — open original |
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3479289) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Lahari Tenneti Posted on May 18 LLVM #5 — Mutable Variables #compilers #llvm #computerscience #learning LLVM - Kaleidoscope (7 Part Series) 1 LLVM — Introduction and Setup 2 LLVM #1 — Lexer, Parser, Codegen ... 3 more parts... 3 Compiler Optimisations 4 LLVM #2 — Optimiser Support & JIT Compilation 5 LLVM #3 — Control Flow 6 LLVM #4 — User Defined Operators 7 LLVM #5 — Mutable Variables So far, Kaleidoscope has been a functional language with immutable variables and no reassignment.
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