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cmd/compile: 16 bit-width, short branch too far ICE on loong64 #61819

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ALTree opened this issue Aug 7, 2023 · 2 comments
Closed

cmd/compile: 16 bit-width, short branch too far ICE on loong64 #61819

ALTree opened this issue Aug 7, 2023 · 2 comments
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@abner-chenc
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arch-loong64 Issues solely affecting the loongson architecture. compiler/runtime Issues related to the Go compiler and/or runtime. NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
Milestone
Go1.23

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@ALTree
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ALTree commented Aug 7, 2023 

$ gotip version
go version devel go1.22-088f953 Mon Aug 7 06:58:18 2023 +0000 linux/amd64

The (unreasonably) big function linked at the bottom of this post triggers an internal compiler error when built for GOARCH=loong64:

$ GOARCH=loong64 gotip build crash.go 

# command-line-arguments
./crash.go:22:5: 16 bit-width, short branch too far
00800 (/home/alberto/crash.go:57)	BLTZ	R4, 131880

Doesn't crash the compiler on other GOARCHs.

Full reproducer on gist.gihub.com.

cc @golang/loong64
@ALTree ALTree added NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. arch-loong64 Issues solely affecting the loongson architecture. labels Aug 7, 2023
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Aug 7, 2023
@ALTree ALTree changed the title cmd/compile: 16 bit-width, short branch too far on loong64 cmd/compile: 16 bit-width, short branch too far ICE on loong64 Aug 7, 2023
@abner-chenc
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Thank you very much for reporting this bug, I have reproduced the bug and fixed it; I am doing local testing, and I will submit the fixed patch as soon as possible.

@mknyszek mknyszek added this to the Backlog milestone Aug 9, 2023
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Change https://go.dev/cl/519915 mentions this issue: cmd/internal/obj/loong64: recheck jump offset boundary after auto-aligning loop heads

@abner-chenc abner-chenc modified the milestones: Backlog, Go1.22 Oct 25, 2023
@gopherbot gopherbot modified the milestones: Go1.22, Go1.23 Feb 6, 2024
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@abner-chenc abner-chenc

Labels
arch-loong64 Issues solely affecting the loongson architecture. compiler/runtime Issues related to the Go compiler and/or runtime. NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
Projects
Go Compiler / Runtime
Status: Done
Milestone
Go1.23
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@mknyszek @ALTree @gopherbot @abner-chenc