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[dev.ssa] cmd/compile: fix a few bugs for SSA for ARM
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- 64x signed right shift was wrong for shift larger than 0x80000000.
- for Lsh-followed-by-Rsh, the intermediate value should be full int
  width, so when it is spilled MOVW should be used.
- use RET for RetJmp, so the assembler can take case of restoring LR
  for non-leaf case.
- reserve R9 in dynlink mode. R9 is used for GOT by the assembler.

Progress on SSA backend for ARM. Still not complete.

Updates #15365.

Change-Id: I3caca256b92ff7cf96469da2feaf4868a592efc5
Reviewed-on: https://go-review.googlesource.com/23793
Reviewed-by: David Chase <[email protected]>
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@cherrymui
cherrymui committed Jun 8, 2016
1 parent 225ef76 commit fa54bf1
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Showing 6 changed files with 63 additions and 71 deletions.
2 changes: 1 addition & 1 deletion src/cmd/compile/internal/arm/ssa.go
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Original file line number Diff line number Diff line change
Expand Up @@ -717,7 +717,7 @@ func ssaGenBlock(s *gc.SSAGenState, b, next *ssa.Block) {
gc.Prog(obj.ARET)

case ssa.BlockRetJmp:
p := gc.Prog(obj.AJMP)
p := gc.Prog(obj.ARET)
p.To.Type = obj.TYPE_MEM
p.To.Name = obj.NAME_EXTERN
p.To.Sym = gc.Linksym(b.Aux.(*gc.Sym))
Expand Down
12 changes: 6 additions & 6 deletions src/cmd/compile/internal/ssa/gen/ARM.rules
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Original file line number Diff line number Diff line change
Expand Up @@ -129,11 +129,11 @@
(Rsh32x64 x (Const64 [c])) && uint64(c) < 32 -> (SRAconst x [c])
(Rsh32Ux64 x (Const64 [c])) && uint64(c) < 32 -> (SRLconst x [c])
(Lsh16x64 x (Const64 [c])) && uint64(c) < 16 -> (SLLconst x [c])
(Rsh16x64 <t> x (Const64 [c])) && uint64(c) < 16 -> (SRAconst (SLLconst <t> x [16]) [c+16])
(Rsh16Ux64 <t> x (Const64 [c])) && uint64(c) < 16 -> (SRLconst (SLLconst <t> x [16]) [c+16])
(Rsh16x64 x (Const64 [c])) && uint64(c) < 16 -> (SRAconst (SLLconst <config.fe.TypeUInt32()> x [16]) [c+16])
(Rsh16Ux64 x (Const64 [c])) && uint64(c) < 16 -> (SRLconst (SLLconst <config.fe.TypeUInt32()> x [16]) [c+16])
(Lsh8x64 x (Const64 [c])) && uint64(c) < 8 -> (SLLconst x [c])
(Rsh8x64 <t> x (Const64 [c])) && uint64(c) < 8 -> (SRAconst (SLLconst <t> x [24]) [c+24])
(Rsh8Ux64 <t> x (Const64 [c])) && uint64(c) < 8 -> (SRLconst (SLLconst <t> x [24]) [c+24])
(Rsh8x64 x (Const64 [c])) && uint64(c) < 8 -> (SRAconst (SLLconst <config.fe.TypeUInt32()> x [24]) [c+24])
(Rsh8Ux64 x (Const64 [c])) && uint64(c) < 8 -> (SRLconst (SLLconst <config.fe.TypeUInt32()> x [24]) [c+24])

// large constant shifts
(Lsh32x64 _ (Const64 [c])) && uint64(c) >= 32 -> (Const32 [0])
Expand All @@ -145,8 +145,8 @@

// large constant signed right shift, we leave the sign bit
(Rsh32x64 x (Const64 [c])) && uint64(c) >= 32 -> (SRAconst x [31])
(Rsh16x64 <t> x (Const64 [c])) && uint64(c) >= 16 -> (SRAconst (SLLconst <t> x [16]) [31])
(Rsh8x64 <t> x (Const64 [c])) && uint64(c) >= 8 -> (SRAconst (SLLconst <t> x [24]) [31])
(Rsh16x64 x (Const64 [c])) && uint64(c) >= 16 -> (SRAconst (SLLconst <config.fe.TypeUInt32()> x [16]) [31])
(Rsh8x64 x (Const64 [c])) && uint64(c) >= 8 -> (SRAconst (SLLconst <config.fe.TypeUInt32()> x [24]) [31])

(Lrot32 x [c]) -> (SRRconst x [32-c&31])
(Lrot16 <t> x [c]) -> (OR (SLLconst <t> x [c&15]) (SRLconst <t> x [16-c&15]))
Expand Down
21 changes: 9 additions & 12 deletions src/cmd/compile/internal/ssa/gen/dec64.rules
View file
Original file line number Diff line number Diff line change
Expand Up @@ -230,7 +230,7 @@

// 64x signed right shift
// result.hi = hi>>s
// result.lo = lo>>s | hi<<(32-s) | (hi>>(s-32))&^signmask(s-32) // hi>>(s-32) is signed, large shifts result 0/-1
// result.lo = lo>>s | hi<<(32-s) | (hi>>(s-32))&zeromask(s>>5) // hi>>(s-32) is signed, large shifts result 0/-1
(Rsh64x32 (Int64Make hi lo) s) ->
(Int64Make
(Rsh32x32 <config.fe.TypeUInt32()> hi s)
Expand All @@ -244,9 +244,8 @@
(Rsh32x32 <config.fe.TypeUInt32()>
hi
(Sub32 <config.fe.TypeUInt32()> s (Const32 <config.fe.TypeUInt32()> [32])))
(Com32 <config.fe.TypeUInt32()>
(Signmask
(Sub32 <config.fe.TypeUInt32()> s (Const32 <config.fe.TypeUInt32()> [32])))))))
(Zeromask
(Rsh32Ux32 <config.fe.TypeUInt32()> s (Const32 <config.fe.TypeUInt32()> [5]))))))
(Rsh64x16 (Int64Make hi lo) s) ->
(Int64Make
(Rsh32x16 <config.fe.TypeUInt32()> hi s)
Expand All @@ -260,10 +259,9 @@
(Rsh32x16 <config.fe.TypeUInt32()>
hi
(Sub16 <config.fe.TypeUInt16()> s (Const16 <config.fe.TypeUInt16()> [32])))
(Com32 <config.fe.TypeUInt32()>
(Signmask
(SignExt16to32
(Sub16 <config.fe.TypeUInt16()> s (Const16 <config.fe.TypeUInt16()> [32]))))))))
(Zeromask
(ZeroExt16to32
(Rsh16Ux32 <config.fe.TypeUInt16()> s (Const32 <config.fe.TypeUInt32()> [5])))))))
(Rsh64x8 (Int64Make hi lo) s) ->
(Int64Make
(Rsh32x8 <config.fe.TypeUInt32()> hi s)
Expand All @@ -277,10 +275,9 @@
(Rsh32x8 <config.fe.TypeUInt32()>
hi
(Sub8 <config.fe.TypeUInt8()> s (Const8 <config.fe.TypeUInt8()> [32])))
(Com32 <config.fe.TypeUInt32()>
(Signmask
(SignExt8to32
(Sub8 <config.fe.TypeUInt8()> s (Const8 <config.fe.TypeUInt8()> [32]))))))))
(Zeromask
(ZeroExt8to32
(Rsh8Ux32 <config.fe.TypeUInt8()> s (Const32 <config.fe.TypeUInt32()> [5])))))))

// 64xConst32 shifts
// we probably do not need them -- lateopt may take care of them just fine
Expand Down
11 changes: 9 additions & 2 deletions src/cmd/compile/internal/ssa/regalloc.go
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Original file line number Diff line number Diff line change
Expand Up @@ -458,8 +458,15 @@ func (s *regAllocState) init(f *Func) {
if s.f.Config.ctxt.Framepointer_enabled && s.f.Config.FPReg >= 0 {
s.allocatable &^= 1 << uint(s.f.Config.FPReg)
}
if s.f.Config.ctxt.Flag_dynlink && s.f.Config.arch == "amd64" {
s.allocatable &^= 1 << 15 // R15
if s.f.Config.ctxt.Flag_dynlink {
switch s.f.Config.arch {
case "amd64":
s.allocatable &^= 1 << 15 // R15
case "arm":
s.allocatable &^= 1 << 9 // R9
default:
s.f.Config.fe.Unimplementedf(0, "arch %s not implemented", s.f.Config.arch)
}
}

s.regs = make([]regState, s.numRegs)
Expand Down
42 changes: 18 additions & 24 deletions src/cmd/compile/internal/ssa/rewriteARM.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -3601,11 +3601,10 @@ func rewriteValueARM_OpRsh16Ux32(v *Value, config *Config) bool {
func rewriteValueARM_OpRsh16Ux64(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (Rsh16Ux64 <t> x (Const64 [c]))
// match: (Rsh16Ux64 x (Const64 [c]))
// cond: uint64(c) < 16
// result: (SRLconst (SLLconst <t> x [16]) [c+16])
// result: (SRLconst (SLLconst <config.fe.TypeUInt32()> x [16]) [c+16])
for {
t := v.Type
x := v.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpConst64 {
Expand All @@ -3616,7 +3615,7 @@ func rewriteValueARM_OpRsh16Ux64(v *Value, config *Config) bool {
break
}
v.reset(OpARMSRLconst)
v0 := b.NewValue0(v.Line, OpARMSLLconst, t)
v0 := b.NewValue0(v.Line, OpARMSLLconst, config.fe.TypeUInt32())
v0.AddArg(x)
v0.AuxInt = 16
v.AddArg(v0)
Expand Down Expand Up @@ -3699,11 +3698,10 @@ func rewriteValueARM_OpRsh16x32(v *Value, config *Config) bool {
func rewriteValueARM_OpRsh16x64(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (Rsh16x64 <t> x (Const64 [c]))
// match: (Rsh16x64 x (Const64 [c]))
// cond: uint64(c) < 16
// result: (SRAconst (SLLconst <t> x [16]) [c+16])
// result: (SRAconst (SLLconst <config.fe.TypeUInt32()> x [16]) [c+16])
for {
t := v.Type
x := v.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpConst64 {
Expand All @@ -3714,18 +3712,17 @@ func rewriteValueARM_OpRsh16x64(v *Value, config *Config) bool {
break
}
v.reset(OpARMSRAconst)
v0 := b.NewValue0(v.Line, OpARMSLLconst, t)
v0 := b.NewValue0(v.Line, OpARMSLLconst, config.fe.TypeUInt32())
v0.AddArg(x)
v0.AuxInt = 16
v.AddArg(v0)
v.AuxInt = c + 16
return true
}
// match: (Rsh16x64 <t> x (Const64 [c]))
// match: (Rsh16x64 x (Const64 [c]))
// cond: uint64(c) >= 16
// result: (SRAconst (SLLconst <t> x [16]) [31])
// result: (SRAconst (SLLconst <config.fe.TypeUInt32()> x [16]) [31])
for {
t := v.Type
x := v.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpConst64 {
Expand All @@ -3736,7 +3733,7 @@ func rewriteValueARM_OpRsh16x64(v *Value, config *Config) bool {
break
}
v.reset(OpARMSRAconst)
v0 := b.NewValue0(v.Line, OpARMSLLconst, t)
v0 := b.NewValue0(v.Line, OpARMSLLconst, config.fe.TypeUInt32())
v0.AddArg(x)
v0.AuxInt = 16
v.AddArg(v0)
Expand Down Expand Up @@ -3981,11 +3978,10 @@ func rewriteValueARM_OpRsh8Ux32(v *Value, config *Config) bool {
func rewriteValueARM_OpRsh8Ux64(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (Rsh8Ux64 <t> x (Const64 [c]))
// match: (Rsh8Ux64 x (Const64 [c]))
// cond: uint64(c) < 8
// result: (SRLconst (SLLconst <t> x [24]) [c+24])
// result: (SRLconst (SLLconst <config.fe.TypeUInt32()> x [24]) [c+24])
for {
t := v.Type
x := v.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpConst64 {
Expand All @@ -3996,7 +3992,7 @@ func rewriteValueARM_OpRsh8Ux64(v *Value, config *Config) bool {
break
}
v.reset(OpARMSRLconst)
v0 := b.NewValue0(v.Line, OpARMSLLconst, t)
v0 := b.NewValue0(v.Line, OpARMSLLconst, config.fe.TypeUInt32())
v0.AddArg(x)
v0.AuxInt = 24
v.AddArg(v0)
Expand Down Expand Up @@ -4079,11 +4075,10 @@ func rewriteValueARM_OpRsh8x32(v *Value, config *Config) bool {
func rewriteValueARM_OpRsh8x64(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (Rsh8x64 <t> x (Const64 [c]))
// match: (Rsh8x64 x (Const64 [c]))
// cond: uint64(c) < 8
// result: (SRAconst (SLLconst <t> x [24]) [c+24])
// result: (SRAconst (SLLconst <config.fe.TypeUInt32()> x [24]) [c+24])
for {
t := v.Type
x := v.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpConst64 {
Expand All @@ -4094,18 +4089,17 @@ func rewriteValueARM_OpRsh8x64(v *Value, config *Config) bool {
break
}
v.reset(OpARMSRAconst)
v0 := b.NewValue0(v.Line, OpARMSLLconst, t)
v0 := b.NewValue0(v.Line, OpARMSLLconst, config.fe.TypeUInt32())
v0.AddArg(x)
v0.AuxInt = 24
v.AddArg(v0)
v.AuxInt = c + 24
return true
}
// match: (Rsh8x64 <t> x (Const64 [c]))
// match: (Rsh8x64 x (Const64 [c]))
// cond: uint64(c) >= 8
// result: (SRAconst (SLLconst <t> x [24]) [31])
// result: (SRAconst (SLLconst <config.fe.TypeUInt32()> x [24]) [31])
for {
t := v.Type
x := v.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpConst64 {
Expand All @@ -4116,7 +4110,7 @@ func rewriteValueARM_OpRsh8x64(v *Value, config *Config) bool {
break
}
v.reset(OpARMSRAconst)
v0 := b.NewValue0(v.Line, OpARMSLLconst, t)
v0 := b.NewValue0(v.Line, OpARMSLLconst, config.fe.TypeUInt32())
v0.AddArg(x)
v0.AuxInt = 24
v.AddArg(v0)
Expand Down
46 changes: 20 additions & 26 deletions src/cmd/compile/internal/ssa/rewritedec64.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1873,7 +1873,7 @@ func rewriteValuedec64_OpRsh64x16(v *Value, config *Config) bool {
_ = b
// match: (Rsh64x16 (Int64Make hi lo) s)
// cond:
// result: (Int64Make (Rsh32x16 <config.fe.TypeUInt32()> hi s) (Or32 <config.fe.TypeUInt32()> (Or32 <config.fe.TypeUInt32()> (Rsh32Ux16 <config.fe.TypeUInt32()> lo s) (Lsh32x16 <config.fe.TypeUInt32()> hi (Sub16 <config.fe.TypeUInt16()> (Const16 <config.fe.TypeUInt16()> [32]) s))) (And32 <config.fe.TypeUInt32()> (Rsh32x16 <config.fe.TypeUInt32()> hi (Sub16 <config.fe.TypeUInt16()> s (Const16 <config.fe.TypeUInt16()> [32]))) (Com32 <config.fe.TypeUInt32()> (Signmask (SignExt16to32 (Sub16 <config.fe.TypeUInt16()> s (Const16 <config.fe.TypeUInt16()> [32]))))))))
// result: (Int64Make (Rsh32x16 <config.fe.TypeUInt32()> hi s) (Or32 <config.fe.TypeUInt32()> (Or32 <config.fe.TypeUInt32()> (Rsh32Ux16 <config.fe.TypeUInt32()> lo s) (Lsh32x16 <config.fe.TypeUInt32()> hi (Sub16 <config.fe.TypeUInt16()> (Const16 <config.fe.TypeUInt16()> [32]) s))) (And32 <config.fe.TypeUInt32()> (Rsh32x16 <config.fe.TypeUInt32()> hi (Sub16 <config.fe.TypeUInt16()> s (Const16 <config.fe.TypeUInt16()> [32]))) (Zeromask (ZeroExt16to32 (Rsh16Ux32 <config.fe.TypeUInt16()> s (Const32 <config.fe.TypeUInt32()> [5])))))))
for {
v_0 := v.Args[0]
if v_0.Op != OpInt64Make {
Expand Down Expand Up @@ -1913,14 +1913,12 @@ func rewriteValuedec64_OpRsh64x16(v *Value, config *Config) bool {
v9.AddArg(v10)
v8.AddArg(v9)
v7.AddArg(v8)
v11 := b.NewValue0(v.Line, OpCom32, config.fe.TypeUInt32())
v12 := b.NewValue0(v.Line, OpSignmask, config.fe.TypeInt32())
v13 := b.NewValue0(v.Line, OpSignExt16to32, config.fe.TypeInt32())
v14 := b.NewValue0(v.Line, OpSub16, config.fe.TypeUInt16())
v14.AddArg(s)
v15 := b.NewValue0(v.Line, OpConst16, config.fe.TypeUInt16())
v15.AuxInt = 32
v14.AddArg(v15)
v11 := b.NewValue0(v.Line, OpZeromask, config.fe.TypeUInt32())
v12 := b.NewValue0(v.Line, OpZeroExt16to32, config.fe.TypeUInt32())
v13 := b.NewValue0(v.Line, OpRsh16Ux32, config.fe.TypeUInt16())
v13.AddArg(s)
v14 := b.NewValue0(v.Line, OpConst32, config.fe.TypeUInt32())
v14.AuxInt = 5
v13.AddArg(v14)
v12.AddArg(v13)
v11.AddArg(v12)
Expand All @@ -1936,7 +1934,7 @@ func rewriteValuedec64_OpRsh64x32(v *Value, config *Config) bool {
_ = b
// match: (Rsh64x32 (Int64Make hi lo) s)
// cond:
// result: (Int64Make (Rsh32x32 <config.fe.TypeUInt32()> hi s) (Or32 <config.fe.TypeUInt32()> (Or32 <config.fe.TypeUInt32()> (Rsh32Ux32 <config.fe.TypeUInt32()> lo s) (Lsh32x32 <config.fe.TypeUInt32()> hi (Sub32 <config.fe.TypeUInt32()> (Const32 <config.fe.TypeUInt32()> [32]) s))) (And32 <config.fe.TypeUInt32()> (Rsh32x32 <config.fe.TypeUInt32()> hi (Sub32 <config.fe.TypeUInt32()> s (Const32 <config.fe.TypeUInt32()> [32]))) (Com32 <config.fe.TypeUInt32()> (Signmask (Sub32 <config.fe.TypeUInt32()> s (Const32 <config.fe.TypeUInt32()> [32])))))))
// result: (Int64Make (Rsh32x32 <config.fe.TypeUInt32()> hi s) (Or32 <config.fe.TypeUInt32()> (Or32 <config.fe.TypeUInt32()> (Rsh32Ux32 <config.fe.TypeUInt32()> lo s) (Lsh32x32 <config.fe.TypeUInt32()> hi (Sub32 <config.fe.TypeUInt32()> (Const32 <config.fe.TypeUInt32()> [32]) s))) (And32 <config.fe.TypeUInt32()> (Rsh32x32 <config.fe.TypeUInt32()> hi (Sub32 <config.fe.TypeUInt32()> s (Const32 <config.fe.TypeUInt32()> [32]))) (Zeromask (Rsh32Ux32 <config.fe.TypeUInt32()> s (Const32 <config.fe.TypeUInt32()> [5]))))))
for {
v_0 := v.Args[0]
if v_0.Op != OpInt64Make {
Expand Down Expand Up @@ -1976,13 +1974,11 @@ func rewriteValuedec64_OpRsh64x32(v *Value, config *Config) bool {
v9.AddArg(v10)
v8.AddArg(v9)
v7.AddArg(v8)
v11 := b.NewValue0(v.Line, OpCom32, config.fe.TypeUInt32())
v12 := b.NewValue0(v.Line, OpSignmask, config.fe.TypeInt32())
v13 := b.NewValue0(v.Line, OpSub32, config.fe.TypeUInt32())
v13.AddArg(s)
v14 := b.NewValue0(v.Line, OpConst32, config.fe.TypeUInt32())
v14.AuxInt = 32
v13.AddArg(v14)
v11 := b.NewValue0(v.Line, OpZeromask, config.fe.TypeUInt32())
v12 := b.NewValue0(v.Line, OpRsh32Ux32, config.fe.TypeUInt32())
v12.AddArg(s)
v13 := b.NewValue0(v.Line, OpConst32, config.fe.TypeUInt32())
v13.AuxInt = 5
v12.AddArg(v13)
v11.AddArg(v12)
v7.AddArg(v11)
Expand Down Expand Up @@ -2078,7 +2074,7 @@ func rewriteValuedec64_OpRsh64x8(v *Value, config *Config) bool {
_ = b
// match: (Rsh64x8 (Int64Make hi lo) s)
// cond:
// result: (Int64Make (Rsh32x8 <config.fe.TypeUInt32()> hi s) (Or32 <config.fe.TypeUInt32()> (Or32 <config.fe.TypeUInt32()> (Rsh32Ux8 <config.fe.TypeUInt32()> lo s) (Lsh32x8 <config.fe.TypeUInt32()> hi (Sub8 <config.fe.TypeUInt8()> (Const8 <config.fe.TypeUInt8()> [32]) s))) (And32 <config.fe.TypeUInt32()> (Rsh32x8 <config.fe.TypeUInt32()> hi (Sub8 <config.fe.TypeUInt8()> s (Const8 <config.fe.TypeUInt8()> [32]))) (Com32 <config.fe.TypeUInt32()> (Signmask (SignExt8to32 (Sub8 <config.fe.TypeUInt8()> s (Const8 <config.fe.TypeUInt8()> [32]))))))))
// result: (Int64Make (Rsh32x8 <config.fe.TypeUInt32()> hi s) (Or32 <config.fe.TypeUInt32()> (Or32 <config.fe.TypeUInt32()> (Rsh32Ux8 <config.fe.TypeUInt32()> lo s) (Lsh32x8 <config.fe.TypeUInt32()> hi (Sub8 <config.fe.TypeUInt8()> (Const8 <config.fe.TypeUInt8()> [32]) s))) (And32 <config.fe.TypeUInt32()> (Rsh32x8 <config.fe.TypeUInt32()> hi (Sub8 <config.fe.TypeUInt8()> s (Const8 <config.fe.TypeUInt8()> [32]))) (Zeromask (ZeroExt8to32 (Rsh8Ux32 <config.fe.TypeUInt8()> s (Const32 <config.fe.TypeUInt32()> [5])))))))
for {
v_0 := v.Args[0]
if v_0.Op != OpInt64Make {
Expand Down Expand Up @@ -2118,14 +2114,12 @@ func rewriteValuedec64_OpRsh64x8(v *Value, config *Config) bool {
v9.AddArg(v10)
v8.AddArg(v9)
v7.AddArg(v8)
v11 := b.NewValue0(v.Line, OpCom32, config.fe.TypeUInt32())
v12 := b.NewValue0(v.Line, OpSignmask, config.fe.TypeInt32())
v13 := b.NewValue0(v.Line, OpSignExt8to32, config.fe.TypeInt32())
v14 := b.NewValue0(v.Line, OpSub8, config.fe.TypeUInt8())
v14.AddArg(s)
v15 := b.NewValue0(v.Line, OpConst8, config.fe.TypeUInt8())
v15.AuxInt = 32
v14.AddArg(v15)
v11 := b.NewValue0(v.Line, OpZeromask, config.fe.TypeUInt32())
v12 := b.NewValue0(v.Line, OpZeroExt8to32, config.fe.TypeUInt32())
v13 := b.NewValue0(v.Line, OpRsh8Ux32, config.fe.TypeUInt8())
v13.AddArg(s)
v14 := b.NewValue0(v.Line, OpConst32, config.fe.TypeUInt32())
v14.AuxInt = 5
v13.AddArg(v14)
v12.AddArg(v13)
v11.AddArg(v12)
Expand Down

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