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[dev.ssa] cmd/compile: make sure we don't move loads between blocks
This can lead to multiple stores being live at once. Do OINDEX and ODOT using addresses & loads instead of specific ops. This keeps SSA values from containing unSSAable types. Change-Id: I79567e9d43cdee09084eb89ea0bd7aa3aad48ada Reviewed-on: https://go-review.googlesource.com/15654 Run-TryBot: Keith Randall <khr@golang.org> Reviewed-by: David Chase <drchase@google.com>
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@ -1732,8 +1732,9 @@ func (s *state) expr(n *Node) *ssa.Value {
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return s.newValue2(ssa.OpLoad, n.Type, p, s.mem())
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case ODOT:
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v := s.expr(n.Left)
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return s.newValue1I(ssa.OpStructSelect, n.Type, n.Xoffset, v)
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// TODO: fix when we can SSA struct types.
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p := s.addr(n)
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return s.newValue2(ssa.OpLoad, n.Type, p, s.mem())
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case ODOTPTR:
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p := s.expr(n.Left)
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@ -1742,29 +1743,29 @@ func (s *state) expr(n *Node) *ssa.Value {
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return s.newValue2(ssa.OpLoad, n.Type, p, s.mem())
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case OINDEX:
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if n.Left.Type.Bound >= 0 { // array or string
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switch {
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case n.Left.Type.IsString():
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a := s.expr(n.Left)
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i := s.expr(n.Right)
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i = s.extendIndex(i)
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if n.Left.Type.IsString() {
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if !n.Bounded {
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len := s.newValue1(ssa.OpStringLen, Types[TINT], a)
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s.boundsCheck(i, len)
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}
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ptrtyp := Ptrto(Types[TUINT8])
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ptr := s.newValue1(ssa.OpStringPtr, ptrtyp, a)
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ptr = s.newValue2(ssa.OpAddPtr, ptrtyp, ptr, i)
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return s.newValue2(ssa.OpLoad, Types[TUINT8], ptr, s.mem())
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} else {
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if !n.Bounded {
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len := s.constInt(Types[TINT], n.Left.Type.Bound)
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s.boundsCheck(i, len)
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}
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return s.newValue2(ssa.OpArrayIndex, n.Left.Type.Type, a, i)
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if !n.Bounded {
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len := s.newValue1(ssa.OpStringLen, Types[TINT], a)
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s.boundsCheck(i, len)
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}
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} else { // slice
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ptrtyp := Ptrto(Types[TUINT8])
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ptr := s.newValue1(ssa.OpStringPtr, ptrtyp, a)
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ptr = s.newValue2(ssa.OpAddPtr, ptrtyp, ptr, i)
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return s.newValue2(ssa.OpLoad, Types[TUINT8], ptr, s.mem())
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case n.Left.Type.IsSlice():
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p := s.addr(n)
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return s.newValue2(ssa.OpLoad, n.Left.Type.Type, p, s.mem())
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case n.Left.Type.IsArray():
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// TODO: fix when we can SSA arrays of length 1.
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p := s.addr(n)
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return s.newValue2(ssa.OpLoad, n.Left.Type.Type, p, s.mem())
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default:
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s.Fatalf("bad type for index %v", n.Left.Type)
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return nil
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}
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case OLEN, OCAP:
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@ -75,9 +75,9 @@
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// indexing operations
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// Note: bounds check has already been done
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(ArrayIndex (Load ptr mem) idx) -> (Load (PtrIndex <v.Type.PtrTo()> ptr idx) mem)
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(ArrayIndex (Load ptr mem) idx) && b == v.Args[0].Block -> (Load (PtrIndex <v.Type.PtrTo()> ptr idx) mem)
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(PtrIndex <t> ptr idx) -> (AddPtr ptr (MulPtr idx (ConstPtr [t.Elem().Size()])))
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(StructSelect [idx] (Load ptr mem)) -> (Load (OffPtr <v.Type.PtrTo()> [idx] ptr) mem)
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(StructSelect [idx] (Load ptr mem)) && b == v.Args[0].Block -> (Load (OffPtr <v.Type.PtrTo()> [idx] ptr) mem)
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// complex ops
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(ComplexReal (ComplexMake real _ )) -> real
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@ -136,15 +136,18 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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;
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case OpArrayIndex:
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// match: (ArrayIndex (Load ptr mem) idx)
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// cond:
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// cond: b == v.Args[0].Block
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// result: (Load (PtrIndex <v.Type.PtrTo()> ptr idx) mem)
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{
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if v.Args[0].Op != OpLoad {
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goto end4894dd7b58383fee5f8a92be08437c33
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goto end68b373270d9d605c420497edefaa71df
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}
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ptr := v.Args[0].Args[0]
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mem := v.Args[0].Args[1]
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idx := v.Args[1]
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if !(b == v.Args[0].Block) {
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goto end68b373270d9d605c420497edefaa71df
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}
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v.Op = OpLoad
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v.AuxInt = 0
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v.Aux = nil
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@ -157,8 +160,8 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.AddArg(mem)
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return true
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}
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goto end4894dd7b58383fee5f8a92be08437c33
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end4894dd7b58383fee5f8a92be08437c33:
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goto end68b373270d9d605c420497edefaa71df
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end68b373270d9d605c420497edefaa71df:
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;
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case OpCom16:
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// match: (Com16 (Com16 x))
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@ -1510,15 +1513,18 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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;
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case OpStructSelect:
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// match: (StructSelect [idx] (Load ptr mem))
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// cond:
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// cond: b == v.Args[0].Block
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// result: (Load (OffPtr <v.Type.PtrTo()> [idx] ptr) mem)
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{
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idx := v.AuxInt
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if v.Args[0].Op != OpLoad {
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goto end16fdb45e1dd08feb36e3cc3fb5ed8935
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goto endd1a92da3e00c16a8f5bd3bd30deca298
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}
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ptr := v.Args[0].Args[0]
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mem := v.Args[0].Args[1]
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if !(b == v.Args[0].Block) {
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goto endd1a92da3e00c16a8f5bd3bd30deca298
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}
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v.Op = OpLoad
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v.AuxInt = 0
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v.Aux = nil
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@ -1531,8 +1537,8 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.AddArg(mem)
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return true
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}
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goto end16fdb45e1dd08feb36e3cc3fb5ed8935
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end16fdb45e1dd08feb36e3cc3fb5ed8935:
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goto endd1a92da3e00c16a8f5bd3bd30deca298
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endd1a92da3e00c16a8f5bd3bd30deca298:
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;
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case OpSub16:
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// match: (Sub16 x x)
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