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cmd/compile: internal compiler error: Invalid PPC64 rotate mask [1.16 backport] #45636

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gopherbot opened this issue Apr 19, 2021 · 7 comments
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cmd/compile: internal compiler error: Invalid PPC64 rotate mask [1.16 backport] #45636

gopherbot opened this issue Apr 19, 2021 · 7 comments
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CherryPickApproved Used during the release process for point releases FrozenDueToAge
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Go1.16.4

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@gopherbot
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@pmur requested issue #45589 to be considered for backport to the next 1.16 minor release.

@gopherbot backport to 1.16 please
@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label Apr 19, 2021
@gopherbot gopherbot mentioned this issue Apr 19, 2021
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@gopherbot gopherbot added this to the Go1.16.4 milestone Apr 19, 2021
@pmur
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pmur commented Apr 19, 2021

The original issue was opened against the 1.16 when the merging support was added. It appears to have prevented somebody from compiling non-intuitive code (That is, a 0-length shift feeding an andi).

@gopherbot
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Change https://golang.org/cl/311378 mentions this issue: [release-branch.go1.16] cmd/compile: fix ANDI/SRWI merge on ppc64

@toothrot toothrot added the CherryPickApproved Used during the release process for point releases label Apr 22, 2021
@gopherbot gopherbot removed the CherryPickCandidate Used during the release process for point releases label Apr 22, 2021
@toothrot
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Approved. This is a serious issue with no workaround.

@toothrot
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@pmur @ALTree Does this also impact 1.15? If so, we need to open a backport for 1.15 as well.

@pmur
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pmur commented Apr 22, 2021

@toothrot Nope. 1.16 only.

@cagedmantis
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Thank you for this work @pmur

@gopherbot
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Closed by merging 7e70979 to release-branch.go1.16.

gopherbot pushed a commit that referenced this issue May 4, 2021
@pmur @cagedmantis
[release-branch.go1.16] cmd/compile: fix ANDI/SRWI merge on ppc64
7e70979 
The shift amount should be masked to avoid rotation values
beyond the numer of bits. In this case, if the shift amount
is 0, it should rotate 0, not 32.

Fixes #45636

Change-Id: I1e764497a39d0ec128e29af42352b70c70b2ecc5
Reviewed-on: https://go-review.googlesource.com/c/go/+/310569
Run-TryBot: Paul Murphy <murp@ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Carlos Eduardo Seo <carlos.seo@linaro.org>
Trust: Carlos Eduardo Seo <carlos.seo@linaro.org>
(cherry picked from commit c8fb0ec)
Reviewed-on: https://go-review.googlesource.com/c/go/+/311378
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
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