[go] cmd/compile: fix internal compiler error: bad write barrier type

[Gopher Robot (Gerrit)]

Gopher Robot submitted the change

Change information

Commit message:

cmd/compile: fix internal compiler error: bad write barrier type

This change fixes an issue where the compiler panics with 'bad
write barrier type' for zero-sized arrays. The loops in
storeTypeScalars and storeTypePtrs erroneously processed
zero-sized arrays causing invalid operations. This ignores them.

Fixes #77815

Change-Id: I0db1b924fc63a75f1bed7488e2dc54d2de5dc0b2

Reviewed-on: https://go-review.googlesource.com/c/go/+/749380

Reviewed-by: Keith Randall <k...@google.com>

Auto-Submit: Keith Randall <k...@golang.org>

Reviewed-by: David Chase <drc...@google.com>

Reviewed-by: Keith Randall <k...@golang.org>

LUCI-TryBot-Result: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Files:

• M src/cmd/compile/internal/ssagen/ssa.go
• A test/fixedbugs/issue77815.go

Change size: S

Delta: 2 files changed, 22 insertions(+), 2 deletions(-)

Branch: refs/heads/master

Submit Requirements:

• Code-Review: +1 by David Chase, +1 by Keith Randall, +2 by Keith Randall
• TryBots-Pass: LUCI-TryBot-Result+1 by Go LUCI

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Gerrit

Gerrit-MessageType: merged

Gerrit-Project: go

Gerrit-Branch: master

Gerrit-Change-Id: I0db1b924fc63a75f1bed7488e2dc54d2de5dc0b2

Gerrit-Change-Number: 749380

Gerrit-PatchSet: 5

Gerrit-Owner: Francisco Ferraz <francisc...@gmail.com>

Gerrit-Reviewer: David Chase <drc...@google.com>

Gerrit-Reviewer: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Gerrit-Reviewer: Gopher Robot <go...@golang.org>

Gerrit-Reviewer: Keith Randall <k...@golang.org>

Gerrit-Reviewer: Keith Randall <k...@google.com>

Gerrit-CC: Mateusz Poliwczak <mpoliw...@gmail.com>