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cmd/compile: linux/s390x: inlining bug in s390x [1.21 backport] #64472

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gopherbot opened this issue Nov 30, 2023 · 3 comments
Closed

cmd/compile: linux/s390x: inlining bug in s390x [1.21 backport] #64472

gopherbot opened this issue Nov 30, 2023 · 3 comments
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CherryPickApproved Used during the release process for point releases compiler/runtime Issues related to the Go compiler and/or runtime.
Milestone
Go1.21.6

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@gopherbot
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@randall77 requested issue #64468 to be considered for backport to the next 1.21 minor release.

@gopherbot please open a backport issue for 1.21.

This is a pretty serious miscompilation with no easy workaround.
@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label Nov 30, 2023
@gopherbot gopherbot mentioned this issue Nov 30, 2023
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@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Nov 30, 2023
@gopherbot gopherbot added this to the Go1.21.5 milestone Nov 30, 2023
@gopherbot
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Change https://go.dev/cl/546356 mentions this issue: [release-branch.go1.21] cmd/compile: fix memcombine pass for big endian, > 1 byte elements

@gopherbot gopherbot modified the milestones: Go1.21.5, Go1.21.6 Dec 5, 2023
@cagedmantis
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Approved. It's a serious issue without a workaround.

@cagedmantis cagedmantis added the CherryPickApproved Used during the release process for point releases label Dec 6, 2023
@gopherbot gopherbot removed the CherryPickCandidate Used during the release process for point releases label Dec 6, 2023
gopherbot pushed a commit that referenced this issue Dec 6, 2023
@randall77 @cagedmantis
[release-branch.go1.21] cmd/compile: fix memcombine pass for big endi…
8c840b1 
…an, > 1 byte elements

The shift amounts were wrong in this case, leading to miscompilation
of load combining.

Also the store combining was not triggering when it should.

Fixes #64472

Change-Id: Iaeb08972c5fc1d6f628800334789c6af7216e87b
Reviewed-on: https://go-review.googlesource.com/c/go/+/546355
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/546356
@gopherbot
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Closed by merging 8c840b1 to release-branch.go1.21.

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CherryPickApproved Used during the release process for point releases compiler/runtime Issues related to the Go compiler and/or runtime.
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Go1.21.6
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@cagedmantis @gopherbot