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cmd/compile: internal compiler error: 'f': value .autotmp_1 (nil) incorrectly live at entry [1.21 backport] #61781

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gopherbot opened this issue Aug 5, 2023 · 2 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.
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@gopherbot
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@cuonglm requested issue #61778 to be considered for backport to the next 1.21 minor release.

@gopherbot please backport this to go1.21

The ICE introduced in CL 497276, where an optimization for len(string([]byte)) was added.

@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label Aug 5, 2023
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Aug 5, 2023
@gopherbot gopherbot added this to the Go1.21.1 milestone Aug 5, 2023
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Change https://go.dev/cl/516535 mentions this issue: [release-branch.go1.21] cmd/compile: fix missing init nodes for len(string([]byte)) optimization

@heschi heschi added the CherryPickApproved Used during the release process for point releases label Aug 9, 2023
@gopherbot gopherbot removed the CherryPickCandidate Used during the release process for point releases label Aug 9, 2023
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Closed by merging 1755d14 to release-branch.go1.21.

gopherbot pushed a commit that referenced this issue Aug 11, 2023
…tring([]byte)) optimization

CL 497276 added optimization for len(string([]byte)) by avoiding call to
slicebytetostring. However, the bytes to string expression may contain
init nodes, which need to be preserved. Otherwise, it would make the
liveness analysis confusing about the lifetime of temporary variables
created by init nodes.

Fixes #61781

Change-Id: I6d1280a7d61bcc75f11132af41bda086f084ab54
Reviewed-on: https://go-review.googlesource.com/c/go/+/516375
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/516535
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