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Commit 2d16e431 authored by David Chase's avatar David Chase
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[dev.ssa] cmd/compile: PPC64, basic support for all calls and "miscellaneous" 

Added support for ClosureCall, DeferCall, InterCall
(GoCall not yet tested).

Added support for GetClosurePtr, IsNonNil, IsInBounds, IsSliceInBounds, NilCheck
(Convert and GetG not yet tested)

Still need to implement NilCheck optimizations.
Fixed move boolean constant, order of operands to subtract.

Updates #16010.

Change-Id: Ibe0f6a6e688df4396cd77de0e9095997e4ca8ed2
Reviewed-on: https://go-review.googlesource.com/25241Reviewed-by: default avatarCherry Zhang <cherryyz@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
parent 806cacc7
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Inline Side-by-side
Showing with 780 additions and 277 deletions
src/cmd/compile/internal/ppc64/ssa.go
View file @ 2d16e431
......@@ -12,7 +12,7 @@ import (
)
var ssaRegToReg = []int16{
ppc64.REGZERO,
// ppc64.REGZERO, // not an SSA reg
ppc64.REGSP,
ppc64.REG_R2,
ppc64.REG_R3,
......@@ -44,6 +44,53 @@ var ssaRegToReg = []int16{
ppc64.REG_R29,
ppc64.REGG,
ppc64.REGTMP,
ppc64.REG_F0,
ppc64.REG_F1,
ppc64.REG_F2,
ppc64.REG_F3,
ppc64.REG_F4,
ppc64.REG_F5,
ppc64.REG_F6,
ppc64.REG_F7,
ppc64.REG_F8,
ppc64.REG_F9,
ppc64.REG_F10,
ppc64.REG_F11,
ppc64.REG_F12,
ppc64.REG_F13,
ppc64.REG_F14,
ppc64.REG_F15,
ppc64.REG_F16,
ppc64.REG_F17,
ppc64.REG_F18,
ppc64.REG_F19,
ppc64.REG_F20,
ppc64.REG_F21,
ppc64.REG_F22,
ppc64.REG_F23,
ppc64.REG_F24,
ppc64.REG_F25,
ppc64.REG_F26,
ppc64.REG_F27,
ppc64.REG_F28,
ppc64.REG_F29,
ppc64.REG_F30,
ppc64.REG_F31,
// ppc64.REG_CR0,
// ppc64.REG_CR1,
// ppc64.REG_CR2,
// ppc64.REG_CR3,
// ppc64.REG_CR4,
// ppc64.REG_CR5,
// ppc64.REG_CR6,
// ppc64.REG_CR7,
ppc64.REG_CR,
// ppc64.REG_XER,
// ppc64.REG_LR,
// ppc64.REG_CTR,
}
// Associated condition bit
......@@ -98,7 +145,26 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
// input args need no code
case ssa.OpSP, ssa.OpSB:
// nothing to do
case ssa.OpCopy:
case ssa.OpCopy, ssa.OpPPC64MOVDconvert:
// TODO: copy of floats
if v.Type.IsMemory() {
return
}
x := gc.SSARegNum(v.Args[0])
y := gc.SSARegNum(v)
if x != y {
p := gc.Prog(ppc64.AMOVD)
p.From.Type = obj.TYPE_REG
p.From.Reg = x
p.To.Reg = y
p.To.Type = obj.TYPE_REG
}
case ssa.OpPPC64LoweredGetClosurePtr:
// Closure pointer is R11 (already)
gc.CheckLoweredGetClosurePtr(v)
case ssa.OpLoadReg:
// TODO: by type
p := gc.Prog(ppc64.AMOVD)
......@@ -138,8 +204,8 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
r2 := gc.SSARegNum(v.Args[1])
p := gc.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
p.From.Reg = r1
p.Reg = r2
p.From.Reg = r2
p.Reg = r1
p.To.Type = obj.TYPE_REG
p.To.Reg = r
case ssa.OpPPC64NEG:
......@@ -195,7 +261,7 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
v.Fatalf("bad reg %s for symbol type %T, want %s", reg.Name(), v.Aux, wantreg)
}
case ssa.OpPPC64MOVDconst, ssa.OpPPC64MOVWconst, ssa.OpPPC64MOVHconst, ssa.OpPPC64MOVBconst, ssa.OpPPC64FMOVDconst, ssa.OpPPC64FMOVSconst:
case ssa.OpPPC64MOVDconst, ssa.OpPPC64MOVWconst, ssa.OpPPC64FMOVDconst, ssa.OpPPC64FMOVSconst:
p := gc.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_CONST
p.From.Offset = v.AuxInt
......@@ -261,8 +327,22 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
p.To.Type = obj.TYPE_MEM
p.To.Reg = gc.SSARegNum(v.Args[0])
gc.AddAux(&p.To, v)
case ssa.OpPPC64CALLstatic:
// TODO: deferreturn
if v.Aux.(*gc.Sym) == gc.Deferreturn.Sym {
// Deferred calls will appear to be returning to
// the CALL deferreturn(SB) that we are about to emit.
// However, the stack trace code will show the line
// of the instruction byte before the return PC.
// To avoid that being an unrelated instruction,
// insert two actual hardware NOPs that will have the right line number.
// This is different from obj.ANOP, which is a virtual no-op
// that doesn't make it into the instruction stream.
// PPC64 is unusual because TWO nops are required
// (see gc/cgen.go, gc/plive.go)
ginsnop()
ginsnop()
}
p := gc.Prog(obj.ACALL)
p.To.Type = obj.TYPE_MEM
p.To.Name = obj.NAME_EXTERN
......@@ -270,12 +350,56 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
if gc.Maxarg < v.AuxInt {
gc.Maxarg = v.AuxInt
}
case ssa.OpPPC64CALLclosure:
p := gc.Prog(obj.ACALL)
p.To.Type = obj.TYPE_MEM
p.To.Reg = gc.SSARegNum(v.Args[0])
if gc.Maxarg < v.AuxInt {
gc.Maxarg = v.AuxInt
}
case ssa.OpPPC64CALLdefer:
p := gc.Prog(obj.ACALL)
p.To.Type = obj.TYPE_MEM
p.To.Name = obj.NAME_EXTERN
p.To.Sym = gc.Linksym(gc.Deferproc.Sym)
if gc.Maxarg < v.AuxInt {
gc.Maxarg = v.AuxInt
}
case ssa.OpPPC64CALLgo:
p := gc.Prog(obj.ACALL)
p.To.Type = obj.TYPE_MEM
p.To.Name = obj.NAME_EXTERN
p.To.Sym = gc.Linksym(gc.Newproc.Sym)
if gc.Maxarg < v.AuxInt {
gc.Maxarg = v.AuxInt
}
case ssa.OpPPC64CALLinter:
p := gc.Prog(obj.ACALL)
p.To.Type = obj.TYPE_MEM
p.To.Reg = gc.SSARegNum(v.Args[0])
if gc.Maxarg < v.AuxInt {
gc.Maxarg = v.AuxInt
}
case ssa.OpVarDef:
gc.Gvardef(v.Aux.(*gc.Node))
case ssa.OpVarKill:
gc.Gvarkill(v.Aux.(*gc.Node))
case ssa.OpVarLive:
gc.Gvarlive(v.Aux.(*gc.Node))
case ssa.OpKeepAlive:
if !v.Args[0].Type.IsPtrShaped() {
v.Fatalf("keeping non-pointer alive %v", v.Args[0])
}
n, off := gc.AutoVar(v.Args[0])
if n == nil {
v.Fatalf("KeepLive with non-spilled value %s %s", v, v.Args[0])
}
if off != 0 {
v.Fatalf("KeepLive with non-zero offset spill location %s:%d", n, off)
}
gc.Gvarlive(n)
case ssa.OpPPC64Equal,
ssa.OpPPC64NotEqual,
ssa.OpPPC64LessThan,
......@@ -295,6 +419,76 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
v.Fatalf("phi arg at different location than phi: %v @ %v, but arg %v @ %v\n%s\n", v, loc, a, aloc, v.Block.Func)
}
}
case ssa.OpPPC64LoweredNilCheck:
// Optimization - if the subsequent block has a load or store
// at the same address, we don't need to issue this instruction.
// mem := v.Args[1]
// for _, w := range v.Block.Succs[0].Block().Values {
// if w.Op == ssa.OpPhi {
// if w.Type.IsMemory() {
// mem = w
// }
// continue
// }
// if len(w.Args) == 0 || !w.Args[len(w.Args)-1].Type.IsMemory() {
// // w doesn't use a store - can't be a memory op.
// continue
// }
// if w.Args[len(w.Args)-1] != mem {
// v.Fatalf("wrong store after nilcheck v=%s w=%s", v, w)
// }
// switch w.Op {
// case ssa.OpARMMOVBload, ssa.OpARMMOVBUload, ssa.OpARMMOVHload, ssa.OpARMMOVHUload,
// ssa.OpARMMOVWload, ssa.OpARMMOVFload, ssa.OpARMMOVDload,
// ssa.OpARMMOVBstore, ssa.OpARMMOVHstore, ssa.OpARMMOVWstore,
// ssa.OpARMMOVFstore, ssa.OpARMMOVDstore:
// // arg0 is ptr, auxint is offset
// if w.Args[0] == v.Args[0] && w.Aux == nil && w.AuxInt >= 0 && w.AuxInt < minZeroPage {
// if gc.Debug_checknil != 0 && int(v.Line) > 1 {
// gc.Warnl(v.Line, "removed nil check")
// }
// return
// }
// case ssa.OpARMDUFFZERO, ssa.OpARMLoweredZero, ssa.OpARMLoweredZeroU:
// // arg0 is ptr
// if w.Args[0] == v.Args[0] {
// if gc.Debug_checknil != 0 && int(v.Line) > 1 {
// gc.Warnl(v.Line, "removed nil check")
// }
// return
// }
// case ssa.OpARMDUFFCOPY, ssa.OpARMLoweredMove, ssa.OpARMLoweredMoveU:
// // arg0 is dst ptr, arg1 is src ptr
// if w.Args[0] == v.Args[0] || w.Args[1] == v.Args[0] {
// if gc.Debug_checknil != 0 && int(v.Line) > 1 {
// gc.Warnl(v.Line, "removed nil check")
// }
// return
// }
// default:
// }
// if w.Type.IsMemory() {
// if w.Op == ssa.OpVarDef || w.Op == ssa.OpVarKill || w.Op == ssa.OpVarLive {
// // these ops are OK
// mem = w
// continue
// }
// // We can't delay the nil check past the next store.
// break
// }
// }
// Issue a load which will fault if arg is nil.
p := gc.Prog(ppc64.AMOVB)
p.From.Type = obj.TYPE_MEM
p.From.Reg = gc.SSARegNum(v.Args[0])
gc.AddAux(&p.From, v)
p.To.Type = obj.TYPE_REG
p.To.Reg = ppc64.REGTMP
if gc.Debug_checknil != 0 && v.Line > 1 { // v.Line==1 in generated wrappers
gc.Warnl(v.Line, "generated nil check")
}
default:
v.Unimplementedf("genValue not implemented: %s", v.LongString())
}
......@@ -321,6 +515,26 @@ func ssaGenBlock(s *gc.SSAGenState, b, next *ssa.Block) {
s.SetLineno(b.Line)
switch b.Kind {
case ssa.BlockDefer:
// defer returns in R3:
// 0 if we should continue executing
// 1 if we should jump to deferreturn call
p := gc.Prog(ppc64.ACMP)
p.From.Type = obj.TYPE_REG
p.From.Reg = ppc64.REG_R3
p.To.Type = obj.TYPE_REG
p.To.Reg = ppc64.REG_R0
p = gc.Prog(ppc64.ABNE)
p.To.Type = obj.TYPE_BRANCH
s.Branches = append(s.Branches, gc.Branch{P: p, B: b.Succs[1].Block()})
if b.Succs[0].Block() != next {
p := gc.Prog(obj.AJMP)
p.To.Type = obj.TYPE_BRANCH
s.Branches = append(s.Branches, gc.Branch{P: p, B: b.Succs[0].Block()})
}
case ssa.BlockPlain, ssa.BlockCall, ssa.BlockCheck:
if b.Succs[0].Block() != next {
p := gc.Prog(obj.AJMP)
......
src/cmd/compile/internal/ssa/config.go
View file @ 2d16e431
......@@ -182,6 +182,7 @@ func NewConfig(arch string, fe Frontend, ctxt *obj.Link, optimize bool) *Config
c.gpRegMask = gpRegMaskPPC64
c.fpRegMask = fpRegMaskPPC64
c.FPReg = framepointerRegPPC64
c.hasGReg = true
default:
fe.Unimplementedf(0, "arch %s not implemented", arch)
}
......
src/cmd/compile/internal/ssa/gen/PPC64.rules
View file @ 2d16e431
......@@ -37,12 +37,11 @@
(Const32F [val]) -> (FMOVSconst [val])
(Const64F [val]) -> (FMOVDconst [val])
(ConstNil) -> (MOVDconst [0])
(ConstBool [b]) -> (MOVBconst [b])
(ConstBool [b]) -> (MOVWconst [b])
(Addr {sym} base) -> (MOVDaddr {sym} base)
// (Addr {sym} base) -> (ADDconst {sym} base)
(OffPtr [off] ptr) -> (ADD (MOVDconst <config.Frontend().TypeInt64()> [off]) ptr)
(StaticCall [argwid] {target} mem) -> (CALLstatic [argwid] {target} mem)
(And64 x y) -> (AND x y)
(And32 x y) -> (AND (ZeroExt32to64 x) (ZeroExt32to64 y)) // Or? (AND (ZeroExt32to64 x) (ZeroExt32to64 y))
......@@ -206,6 +205,22 @@
(MOVDstorezero [8] destptr
(MOVDstorezero [0] destptr mem))))
// Calls
// Lowering calls
(StaticCall [argwid] {target} mem) -> (CALLstatic [argwid] {target} mem)
(ClosureCall [argwid] entry closure mem) -> (CALLclosure [argwid] entry closure mem)
(DeferCall [argwid] mem) -> (CALLdefer [argwid] mem)
(GoCall [argwid] mem) -> (CALLgo [argwid] mem)
(InterCall [argwid] entry mem) -> (CALLinter [argwid] entry mem)
// Miscellaneous
(Convert <t> x mem) -> (MOVDconvert <t> x mem)
(GetClosurePtr) -> (LoweredGetClosurePtr)
(IsNonNil ptr) -> (NotEqual (CMPconst [0] ptr))
(IsInBounds idx len) -> (LessThan (CMPU idx len))
(IsSliceInBounds idx len) -> (LessEqual (CMPU idx len))
(NilCheck ptr mem) -> (LoweredNilCheck ptr mem)
// Optimizations
(ADD (MOVDconst [c]) x) -> (ADDconst [c] x)
......
src/cmd/compile/internal/ssa/opGen.go
View file @ 2d16e431
This diff is collapsed.
src/cmd/compile/internal/ssa/rewritePPC64.go
View file @ 2d16e431
......@@ -34,6 +34,8 @@ func rewriteValuePPC64(v *Value, config *Config) bool {
return rewriteValuePPC64_OpAnd64(v, config)
case OpAnd8:
return rewriteValuePPC64_OpAnd8(v, config)
case OpClosureCall:
return rewriteValuePPC64_OpClosureCall(v, config)
case OpConst16:
return rewriteValuePPC64_OpConst16(v, config)
case OpConst32:
......@@ -50,6 +52,10 @@ func rewriteValuePPC64(v *Value, config *Config) bool {
return rewriteValuePPC64_OpConstBool(v, config)
case OpConstNil:
return rewriteValuePPC64_OpConstNil(v, config)
case OpConvert:
return rewriteValuePPC64_OpConvert(v, config)
case OpDeferCall:
return rewriteValuePPC64_OpDeferCall(v, config)
case OpDiv32F:
return rewriteValuePPC64_OpDiv32F(v, config)
case OpDiv64F:
......@@ -82,6 +88,10 @@ func rewriteValuePPC64(v *Value, config *Config) bool {
return rewriteValuePPC64_OpGeq8(v, config)
case OpGeq8U:
return rewriteValuePPC64_OpGeq8U(v, config)
case OpGetClosurePtr:
return rewriteValuePPC64_OpGetClosurePtr(v, config)
case OpGoCall:
return rewriteValuePPC64_OpGoCall(v, config)
case OpGreater16:
return rewriteValuePPC64_OpGreater16(v, config)
case OpGreater16U:
......@@ -98,6 +108,14 @@ func rewriteValuePPC64(v *Value, config *Config) bool {
return rewriteValuePPC64_OpGreater8(v, config)
case OpGreater8U:
return rewriteValuePPC64_OpGreater8U(v, config)
case OpInterCall:
return rewriteValuePPC64_OpInterCall(v, config)
case OpIsInBounds:
return rewriteValuePPC64_OpIsInBounds(v, config)
case OpIsNonNil:
return rewriteValuePPC64_OpIsNonNil(v, config)
case OpIsSliceInBounds:
return rewriteValuePPC64_OpIsSliceInBounds(v, config)
case OpLeq16:
return rewriteValuePPC64_OpLeq16(v, config)
case OpLeq16U:
......@@ -184,6 +202,8 @@ func rewriteValuePPC64(v *Value, config *Config) bool {
return rewriteValuePPC64_OpNeq8(v, config)
case OpNeqPtr:
return rewriteValuePPC64_OpNeqPtr(v, config)
case OpNilCheck:
return rewriteValuePPC64_OpNilCheck(v, config)
case OpOffPtr:
return rewriteValuePPC64_OpOffPtr(v, config)
case OpOr16:
......@@ -500,6 +520,25 @@ func rewriteValuePPC64_OpAnd8(v *Value, config *Config) bool {
return true
}
}
func rewriteValuePPC64_OpClosureCall(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (ClosureCall [argwid] entry closure mem)
// cond:
// result: (CALLclosure [argwid] entry closure mem)
for {
argwid := v.AuxInt
entry := v.Args[0]
closure := v.Args[1]
mem := v.Args[2]
v.reset(OpPPC64CALLclosure)
v.AuxInt = argwid
v.AddArg(entry)
v.AddArg(closure)
v.AddArg(mem)
return true
}
}
func rewriteValuePPC64_OpConst16(v *Value, config *Config) bool {
b := v.Block
_ = b
......@@ -583,10 +622,10 @@ func rewriteValuePPC64_OpConstBool(v *Value, config *Config) bool {
_ = b
// match: (ConstBool [b])
// cond:
// result: (MOVBconst [b])
// result: (MOVWconst [b])
for {
b := v.AuxInt
v.reset(OpPPC64MOVBconst)
v.reset(OpPPC64MOVWconst)
v.AuxInt = b
return true
}
......@@ -603,6 +642,38 @@ func rewriteValuePPC64_OpConstNil(v *Value, config *Config) bool {
return true
}
}
func rewriteValuePPC64_OpConvert(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (Convert <t> x mem)
// cond:
// result: (MOVDconvert <t> x mem)
for {
t := v.Type
x := v.Args[0]
mem := v.Args[1]
v.reset(OpPPC64MOVDconvert)
v.Type = t
v.AddArg(x)
v.AddArg(mem)
return true
}
}
func rewriteValuePPC64_OpDeferCall(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (DeferCall [argwid] mem)
// cond:
// result: (CALLdefer [argwid] mem)
for {
argwid := v.AuxInt
mem := v.Args[0]
v.reset(OpPPC64CALLdefer)
v.AuxInt = argwid
v.AddArg(mem)
return true
}
}
func rewriteValuePPC64_OpDiv32F(v *Value, config *Config) bool {
b := v.Block
_ = b
......@@ -895,6 +966,32 @@ func rewriteValuePPC64_OpGeq8U(v *Value, config *Config) bool {
return true
}
}
func rewriteValuePPC64_OpGetClosurePtr(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (GetClosurePtr)
// cond:
// result: (LoweredGetClosurePtr)
for {
v.reset(OpPPC64LoweredGetClosurePtr)
return true
}
}
func rewriteValuePPC64_OpGoCall(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (GoCall [argwid] mem)
// cond:
// result: (CALLgo [argwid] mem)
for {
argwid := v.AuxInt
mem := v.Args[0]
v.reset(OpPPC64CALLgo)
v.AuxInt = argwid
v.AddArg(mem)
return true
}
}
func rewriteValuePPC64_OpGreater16(v *Value, config *Config) bool {
b := v.Block
_ = b
......@@ -1047,6 +1144,73 @@ func rewriteValuePPC64_OpGreater8U(v *Value, config *Config) bool {
return true
}
}
func rewriteValuePPC64_OpInterCall(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (InterCall [argwid] entry mem)
// cond:
// result: (CALLinter [argwid] entry mem)
for {
argwid := v.AuxInt
entry := v.Args[0]
mem := v.Args[1]
v.reset(OpPPC64CALLinter)
v.AuxInt = argwid
v.AddArg(entry)
v.AddArg(mem)
return true
}
}
func rewriteValuePPC64_OpIsInBounds(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (IsInBounds idx len)
// cond:
// result: (LessThan (CMPU idx len))
for {
idx := v.Args[0]
len := v.Args[1]
v.reset(OpPPC64LessThan)
v0 := b.NewValue0(v.Line, OpPPC64CMPU, TypeFlags)
v0.AddArg(idx)
v0.AddArg(len)
v.AddArg(v0)
return true
}
}
func rewriteValuePPC64_OpIsNonNil(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (IsNonNil ptr)
// cond:
// result: (NotEqual (CMPconst [0] ptr))
for {
ptr := v.Args[0]
v.reset(OpPPC64NotEqual)
v0 := b.NewValue0(v.Line, OpPPC64CMPconst, TypeFlags)
v0.AuxInt = 0
v0.AddArg(ptr)
v.AddArg(v0)
return true
}
}
func rewriteValuePPC64_OpIsSliceInBounds(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (IsSliceInBounds idx len)
// cond:
// result: (LessEqual (CMPU idx len))
for {
idx := v.Args[0]
len := v.Args[1]
v.reset(OpPPC64LessEqual)
v0 := b.NewValue0(v.Line, OpPPC64CMPU, TypeFlags)
v0.AddArg(idx)
v0.AddArg(len)
v.AddArg(v0)
return true
}
}
func rewriteValuePPC64_OpLeq16(v *Value, config *Config) bool {
b := v.Block
_ = b
......@@ -2115,6 +2279,21 @@ func rewriteValuePPC64_OpNeqPtr(v *Value, config *Config) bool {
return true
}
}
func rewriteValuePPC64_OpNilCheck(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (NilCheck ptr mem)
// cond:
// result: (LoweredNilCheck ptr mem)
for {
ptr := v.Args[0]
mem := v.Args[1]
v.reset(OpPPC64LoweredNilCheck)
v.AddArg(ptr)
v.AddArg(mem)
return true
}
}
func rewriteValuePPC64_OpOffPtr(v *Value, config *Config) bool {
b := v.Block
_ = b
......
src/cmd/compile/internal/ssa/schedule.go
View file @ 2d16e431
......@@ -84,7 +84,7 @@ func schedule(f *Func) {
// Compute score. Larger numbers are scheduled closer to the end of the block.
for _, v := range b.Values {
switch {
case v.Op == OpAMD64LoweredGetClosurePtr || v.Op == OpARMLoweredGetClosurePtr || v.Op == Op386LoweredGetClosurePtr:
case v.Op == OpAMD64LoweredGetClosurePtr || v.Op == OpPPC64LoweredGetClosurePtr || v.Op == OpARMLoweredGetClosurePtr || v.Op == Op386LoweredGetClosurePtr:
// We also score GetLoweredClosurePtr as early as possible to ensure that the
// context register is not stomped. GetLoweredClosurePtr should only appear
// in the entry block where there are no phi functions, so there is no
......
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