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Diffstat (limited to 'src/cmd/compile/internal/gc/walk.go')
| -rw-r--r-- | src/cmd/compile/internal/gc/walk.go | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/gc/walk.go b/src/cmd/compile/internal/gc/walk.go index ca3025bbaa..79134067c6 100644 --- a/src/cmd/compile/internal/gc/walk.go +++ b/src/cmd/compile/internal/gc/walk.go @@ -3561,6 +3561,12 @@ func walkinrange(n *Node, init *Nodes) *Node { return n } + // Ensure that Int64() does not overflow on a and c (it'll happen + // for any const above 2**63; see issue #27143). + if !a.CanInt64() || !c.CanInt64() { + return n + } + if opl == OLT { // We have a < b && ... // We need a ≤ b && ... to safely use unsigned comparison tricks. |