llvm/llvm-project

Implement fixed point mulifx functions in llvm-libc

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#129,123 opened on Feb 27, 2025

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good first issuelibc

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Description

ISO 18037 describes various fixed point mulifx functions which multiply a fixed point number by an integer and returns an integer rather than a fixed point type.

Contributor guide

Research direction
Study existing fixed point functions in llvm libc (e.g., addfx, subfx) and implement the mulifx family following the same pattern. Ensure correct overflow handling and rounding modes as per ISO 18037.
Tech stack
c
Domain
api
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
C
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45