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cmd/go: go1.11.4 toolchain3 build fail with "slice bounds out of range" on 32-bit MIPS on Debian buildd [1.11 backport] #29442

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gopherbot opened this issue Dec 28, 2018 · 4 comments

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@gopherbot
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@gopherbot gopherbot commented Dec 28, 2018

@anthonyfok requested issue #29402 to be considered for backport to the next 1.11 minor release.

@gopherbot please consider this for backport to 1.11, otherwise release-branch.go1.11 would fail to build on 32-bit MIPS. Thanks!

@anthonyfok

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@anthonyfok anthonyfok commented Dec 28, 2018

@cherrymui When you are free, could you please look into cherry-picking your fix to go1.11 too?
Many thanks!

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@gopherbot gopherbot commented Dec 28, 2018

Change https://golang.org/cl/155799 mentions this issue: [release-branch.go1.11] cmd/compile: fix MIPS SGTconst-with-shift rules

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@katiehockman katiehockman commented Jan 4, 2019

Approving the cherry pick since this constitutes a serious problem with no workaround.

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@gopherbot gopherbot commented Jan 4, 2019

Closed by merging b2c472f to release-branch.go1.11.

@gopherbot gopherbot closed this Jan 4, 2019
gopherbot pushed a commit that referenced this issue Jan 4, 2019
(SGTconst [c] (SRLconst _ [d])) && 0 <= int32(c) && uint32(d) <= 31 && 1<<(32-uint32(d)) <= int32(c) -> (MOVWconst [1])

This rule is problematic. 1<<(32-uint32(d)) <= int32(c) meant to
say that it is true if c is greater than the largest possible
value of the right shift. But when d==1, 1<<(32-1) is negative
and results in the wrong comparison.

Rewrite the rules in a more direct way.

Updates #29402.
Fixes #29442.

Change-Id: I5940fc9538d9bc3a4bcae8aa34672867540dc60e
Reviewed-on: https://go-review.googlesource.com/c/155798
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
(cherry picked from commit 6a64efc)
Reviewed-on: https://go-review.googlesource.com/c/155799
Reviewed-by: David Chase <drchase@google.com>
@julieqiu julieqiu modified the milestones: Go1.11.5, Go1.11.6 Jan 23, 2019
@golang golang locked and limited conversation to collaborators Jan 23, 2020
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