diff options
Diffstat (limited to 'src/cmd/compile/internal/ssa/value.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/value.go | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/value.go b/src/cmd/compile/internal/ssa/value.go index e3510b135e..0e71326450 100644 --- a/src/cmd/compile/internal/ssa/value.go +++ b/src/cmd/compile/internal/ssa/value.go @@ -38,6 +38,9 @@ type Value struct { // Source line number Line int32 + // Use count. Each appearance in Value.Args and Block.Control counts once. + Uses int32 + // Storage for the first three args argstorage [3]*Value } @@ -162,17 +165,24 @@ func (v *Value) AddArg(w *Value) { v.resetArgs() // use argstorage } v.Args = append(v.Args, w) + w.Uses++ } func (v *Value) AddArgs(a ...*Value) { if v.Args == nil { v.resetArgs() // use argstorage } v.Args = append(v.Args, a...) + for _, x := range a { + x.Uses++ + } } func (v *Value) SetArg(i int, w *Value) { + v.Args[i].Uses-- v.Args[i] = w + w.Uses++ } func (v *Value) RemoveArg(i int) { + v.Args[i].Uses-- copy(v.Args[i:], v.Args[i+1:]) v.Args[len(v.Args)-1] = nil // aid GC v.Args = v.Args[:len(v.Args)-1] @@ -188,6 +198,9 @@ func (v *Value) SetArgs2(a *Value, b *Value) { } func (v *Value) resetArgs() { + for _, a := range v.Args { + a.Uses-- + } v.argstorage[0] = nil v.argstorage[1] = nil v.Args = v.argstorage[:0] |