diff options
Diffstat (limited to 'src/cmd/compile/internal/ssa/deadcode.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/deadcode.go | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/deadcode.go b/src/cmd/compile/internal/ssa/deadcode.go index 819f6de247..ae990026f5 100644 --- a/src/cmd/compile/internal/ssa/deadcode.go +++ b/src/cmd/compile/internal/ssa/deadcode.go @@ -164,6 +164,18 @@ func deadcode(f *Func) { } f.Names = f.Names[:i] + // Unlink values. + for _, b := range f.Blocks { + if !reachable[b.ID] { + b.SetControl(nil) + } + for _, v := range b.Values { + if !live[v.ID] { + v.resetArgs() + } + } + } + // Remove dead values from blocks' value list. Return dead // values to the allocator. for _, b := range f.Blocks { @@ -231,6 +243,7 @@ func (b *Block) removePred(p *Block) { if v.Op != OpPhi { continue } + v.Args[i].Uses-- v.Args[i] = v.Args[n] v.Args[n] = nil // aid GC v.Args = v.Args[:n] |