llvm/llvm-project

[ARM] computeKnownBitsForTargetNode - add handling for ARMISD::VMOVIMM\VMVNIMM

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#149,276 opened on Jul 17, 2025

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 (10 comments) (0 reactions) (1 assignee)C++ (10,782 forks)batch import
backend:ARMgood first issue

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Description

Similar to #148634 - the constant operand need to be decoded and then converted with KnownBits::makeConstant

ARMISD::VMOVFPIMM might be useful as well

Contributor guide

Research direction
Examine how ARMISD::VMOVIMM and VMVNIMM nodes are currently handled in computeKnownBitsForTargetNode. Decode the constant operand from the node and convert it to KnownBits using KnownBits::makeConstant. Refer to the similar issue #148634 for patterns. Consider also ARMISD::VMOVFPIMM if applicable.
Tech stack
None
Domain
backend
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.
1-2 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++LLVMARM architecture
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30