golang/go

cmd/compile/internal/ssa: "panic during regalloc" on linux/ppc64*

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#52,924 opened on May 16, 2022

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NeedsInvestigationarch-ppc64xcompiler/runtimehelp wanted

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Description

#!watchflakes
post <- goarch ~ `ppc64.*` && log ~ `panic during regalloc` && log ~ `^\s*cmd/compile/internal/ssa`

greplogs -l -e '(?ms)panic during regalloc .*cmd/compile/internal/ssa\.\(\*sparseSet\)\.add' 2022-05-13T21:33:25-4170084/linux-ppc64le-power9osu

(attn @randall77 @dr2chase @cherrymui; CC @golang/ppc64)

Contributor guide

Research direction
Inspect the sparseSet.add function in cmd/compile/internal/ssa to understand why a panic occurs on ppc64 during regalloc.
Tech stack
go
Domain
backend
Issue type
Bug
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
Go compiler internalsSSA
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
15