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llvm

Generate, optimize, and inspect LLVM Intermediate Representation using Clang, opt, and llc.

159|20|Updated Feb 20, 2026
Search Tags:#optimization#ir#clang#compiler#llvm#opt#llc
One-click install
npx skills add https://github.com/mohitmishra786/low-level-dev-skills --skill llvm
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: llvm
Source: https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/compilers/llvm
Command: npx skills add https://github.com/mohitmishra786/low-level-dev-skills --skill llvm

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) and scripts (resource) components.

What problem does it solve?

This Skill empowers users to understand, generate, and manipulate LLVM Intermediate Representation (IR), enabling deeper insights into compiler optimizations and custom tool development.

Core Features & Use Cases

  • IR Generation: Learn to emit LLVM IR from source code using Clang.
  • Optimization Passes: Apply and analyze various optimization passes using opt.
  • IR Inspection: Understand key IR constructs and debugging missed optimizations.
  • Use Case: Debugging why a specific optimization isn't being applied to your C++ code by inspecting the generated LLVM IR and understanding the pass pipeline.

Quick Start

Generate LLVM IR from a C source file named 'main.c' using the command clang -O0 -emit-llvm -S main.c -o main.ll.

Frequently Asked Questions about llvm

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I generate LLVM IR from C or C++ source code?▼

Generate LLVM IR from C or C++ source code by using Clang with the flags `-O0 -emit-llvm -S`. This compiles your source file into a human-readable `.ll` text file for inspection.

How do I apply optimization passes to LLVM IR?▼

Apply optimization passes to LLVM IR using the `opt` tool. This allows you to analyze and transform the intermediate representation to understand how specific compiler optimizations affect your code.

How can I debug why a specific optimization isn't being applied to my code?▼

Debug missed optimizations by inspecting the generated LLVM IR and analyzing the pass pipeline. Generate the IR with Clang, then use `opt` to manually apply passes and identify where the optimization fails.

What is the best way to lower LLVM IR to assembly?▼

Lower LLVM IR to target-specific assembly by using the `llc` tool. This translates the optimized intermediate representation into machine code for your specified architecture.

Do I need to understand IR constructs to develop custom LLVM-based tools?▼

Understanding IR constructs is essential for custom LLVM-based tool development. Inspecting the intermediate representation provides the deep compiler analysis needed to build and debug specialized tooling.

What does the LLVM IR inspection process involve?▼

LLVM IR inspection involves emitting the intermediate representation from source code and analyzing its constructs. This process reveals how the compiler interprets your code and applies optimizations.

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