llvm/llvm-project

[NVPTX] Port code to `llvm/lib/CodeGen/SelectionDAG/*`

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#116,695 opened on Nov 18, 2024

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backend:NVPTXgood first issuellvm:SelectionDAG

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Description

Some of NVPTX's custom operation lowering and custom DAG combines do not rely on NVPTXISD nodes. A majority of these operation lowerings and DAG combines can be ported to live in LegalizeDAG.cpp or DAGCombiner.cpp respectively.

This will increase the coverage we have on this code and enable other targets to benefit from the work we've done.

For example,

Contributor guide

Research direction
Examine the NVPTX custom lowerings and combines listed, then move them to LegalizeDAG.cpp and DAGCombiner.cpp respectively, ensuring the generic DAG combines are properly triggered.
Tech stack
cpp
Domain
compilers
Issue type
Refactor
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
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.
Clear
Prerequisites
C++GitLLVM
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40