golang/go

cmd/compile: use bounded shift information on non-amd64 architectures

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#25,167 opened on Apr 29, 2018

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PerformanceSuggestedcompiler/runtimehelp wanted

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Description

CL 109776 optimized some shifts on amd64. We should apply the same straightforward optimization rule changes to other architectures.

Might be a good starter SSA issue.

cc @mundaym @cherrymui

Contributor guide

Research direction
Inspect the optimization rules for shift operations on amd64 (CL 109776) and apply similar transformations to other architectures in the SSA backend.
Tech stack
go
Domain
backend
Issue type
Refactor
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
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Stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GoGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75