diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/cmd/compile/internal/gc/plive.go | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/gc/plive.go b/src/cmd/compile/internal/gc/plive.go index b3cecdf894..8b8882ac55 100644 --- a/src/cmd/compile/internal/gc/plive.go +++ b/src/cmd/compile/internal/gc/plive.go @@ -186,6 +186,17 @@ func (lv *Liveness) valueEffects(v *ssa.Value) (pos int32, effect liveEffect) { return -1, 0 } + // AllocFrame has dropped unused variables from + // lv.fn.Func.Dcl, but they might still be referenced by + // OpVarFoo pseudo-ops. Ignore them to prevent "lost track of + // variable" ICEs (issue 19632). + switch v.Op { + case ssa.OpVarDef, ssa.OpVarKill, ssa.OpVarLive, ssa.OpKeepAlive: + if !n.Used() { + return -1, 0 + } + } + pos = liveIndex(n, lv.vars) if pos < 0 { return -1, 0 |