llvm/llvm-project

[DAG] computeKnownFPClass - add ISD::SQRT handling + test coverage

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#189,583 opened on Mar 31, 2026

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good first issuellvm:SelectionDAG

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Description

This will need to be based off the implementation in computeKnownFPClass in ValueTracking.cpp.

This should be tested with IR tests and not unit tests

Contributor guide

Research direction
Familiarize yourself with computeKnownFPClass in ValueTracking.cpp and implement the SQRT handling in the DAG version, then add IR tests.
Tech stack
cpp
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
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.
Clear
Prerequisites
C++LLVMDAG
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40