diff options
Diffstat (limited to 'src/cmd/compile/internal/ssa/stackalloc.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/stackalloc.go | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/src/cmd/compile/internal/ssa/stackalloc.go b/src/cmd/compile/internal/ssa/stackalloc.go index 1de22dc96e..44f4096cb2 100644 --- a/src/cmd/compile/internal/ssa/stackalloc.go +++ b/src/cmd/compile/internal/ssa/stackalloc.go @@ -22,6 +22,13 @@ type stackAllocState struct { names []LocalSlot slots []int used []bool + + nArgSlot, // Number of Values sourced to arg slot + nNotNeed, // Number of Values not needing a stack slot + nNamedSlot, // Number of Values using a named stack slot + nReuse, // Number of values reusing a stack slot + nAuto, // Number of autos allocated for stack slots. + nSelfInterfere int32 // Number of self-interferences } func newStackAllocState(f *Func) *stackAllocState { @@ -54,6 +61,7 @@ func putStackAllocState(s *stackAllocState) { s.f.Config.stackAllocState = s s.f = nil s.live = nil + s.nArgSlot, s.nNotNeed, s.nNamedSlot, s.nReuse, s.nAuto, s.nSelfInterfere = 0, 0, 0, 0, 0, 0 } type stackValState struct { @@ -75,6 +83,13 @@ func stackalloc(f *Func, spillLive [][]ID) [][]ID { defer putStackAllocState(s) s.stackalloc() + if f.pass.stats > 0 { + f.logStat("stack_alloc_stats", + s.nArgSlot, "arg_slots", s.nNotNeed, "slot_not_needed", + s.nNamedSlot, "named_slots", s.nAuto, "auto_slots", + s.nReuse, "reused_slots", s.nSelfInterfere, "self_interfering") + } + return s.live } @@ -170,9 +185,11 @@ func (s *stackAllocState) stackalloc() { for _, b := range f.Blocks { for _, v := range b.Values { if !s.values[v.ID].needSlot { + s.nNotNeed++ continue } if v.Op == OpArg { + s.nArgSlot++ continue // already picked } @@ -184,18 +201,20 @@ func (s *stackAllocState) stackalloc() { } else { name = names[v.ID] } - if name.N != nil && v.Type.Equal(name.Type) { + if name.N != nil && v.Type.Compare(name.Type) == CMPeq { for _, id := range s.interfere[v.ID] { h := f.getHome(id) if h != nil && h.(LocalSlot).N == name.N && h.(LocalSlot).Off == name.Off { // A variable can interfere with itself. // It is rare, but but it can happen. + s.nSelfInterfere++ goto noname } } if f.pass.debug > stackDebug { fmt.Printf("stackalloc %s to %s\n", v, name.Name()) } + s.nNamedSlot++ f.setHome(v, name) continue } @@ -217,11 +236,13 @@ func (s *stackAllocState) stackalloc() { var i int for i = 0; i < len(locs); i++ { if !used[i] { + s.nReuse++ break } } // If there is no unused stack slot, allocate a new one. if i == len(locs) { + s.nAuto++ locs = append(locs, LocalSlot{N: f.Config.fe.Auto(v.Type), Type: v.Type, Off: 0}) locations[v.Type] = locs } @@ -351,7 +372,7 @@ func (s *stackAllocState) buildInterferenceGraph() { if s.values[v.ID].needSlot { live.remove(v.ID) for _, id := range live.contents() { - if s.values[v.ID].typ.Equal(s.values[id].typ) { + if s.values[v.ID].typ.Compare(s.values[id].typ) == CMPeq { s.interfere[v.ID] = append(s.interfere[v.ID], id) s.interfere[id] = append(s.interfere[id], v.ID) } |