dotnet/runtime

RyuJIT/x86: REGMASK_BITS should be 16 for x86, not 32

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#7,575 opened on Mar 8, 2017

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HackathonJitThroughputarch-x86area-CodeGen-coreclrenhancementgood first issuetenet-performance

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Description

regMaskSmall can be 16 bits, not 32, for RyuJIT/x86.

category:throughput theme:ir skill-level:intermediate cost:small

Contributor guide

Research direction
Examine the definition and usage of REGMASK BITS in the RyuJIT x86 code to understand why it should be 16 bits instead of 32. Trace the code path where regMaskSmall is used to confirm the change.
Tech stack
csharp
Domain
compilersperformance
Issue type
Performance
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.
1-3 hours
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
GitC#
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60