[go/release-branch.go1.25] [release-branch.go1.25] cmd/compile: handle min integer step in loop

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Carlos Amedee (Gerrit)

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Apr 23, 2026, 4:27:59 PM (2 days ago) Apr 23

to Cuong Manh Le, goph...@pubsubhelper.golang.org, golang-...@googlegroups.com, Dmitri Shuralyov, Mark Freeman, Keith Randall, David Chase, golang...@luci-project-accounts.iam.gserviceaccount.com, Keith Randall, golang-co...@googlegroups.com

Carlos Amedee submitted the change

Change information

Commit message:

[release-branch.go1.25] cmd/compile: handle min integer step in loop

Since negating min int will overflows back to itself, causing a panic
inside subWillUnderflow check.

Fixes #78675

Change-Id: Ibbf2fa3228b9890a1a76ac6f4ff504b7e125b29f

Reviewed-on: https://go-review.googlesource.com/c/go/+/766260

Auto-Submit: Cuong Manh Le <cuong.m...@gmail.com>

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

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

Reviewed-by: Jorropo <jorro...@gmail.com>

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

Reviewed-on: https://go-review.googlesource.com/c/go/+/766860

TryBot-Bypass: Dmitri Shuralyov <dmit...@golang.org>

Files:

M src/cmd/compile/internal/ssa/loopbce.go
A test/fixedbugs/issue78641.go

Change size: S

Delta: 2 files changed, 31 insertions(+), 0 deletions(-)

Branch: refs/heads/release-branch.go1.25

Submit Requirements:

Code-Review: +1 by Keith Randall, +2 by David Chase
TryBots-Pass: LUCI-TryBot-Result-1 by golang...@luci-project-accounts.iam.gserviceaccount.com, TryBot-Bypass+1 by Dmitri Shuralyov

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