Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 820 insertions, 0 deletions

diff --git a/src/cmd/compile/internal/loong64/ssa.go b/src/cmd/compile/internal/loong64/ssa.go
new file mode 100644
index 0000000..8193b4e
--- /dev/null
+++ b/src/cmd/compile/internal/loong64/ssa.go
@@ -0,0 +1,820 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package loong64
+
+import (
+	"math"
+
+	"cmd/compile/internal/base"
+	"cmd/compile/internal/ir"
+	"cmd/compile/internal/logopt"
+	"cmd/compile/internal/ssa"
+	"cmd/compile/internal/ssagen"
+	"cmd/compile/internal/types"
+	"cmd/internal/obj"
+	"cmd/internal/obj/loong64"
+)
+
+// isFPreg reports whether r is an FP register.
+func isFPreg(r int16) bool {
+	return loong64.REG_F0 <= r && r <= loong64.REG_F31
+}
+
+// loadByType returns the load instruction of the given type.
+func loadByType(t *types.Type, r int16) obj.As {
+	if isFPreg(r) {
+		if t.Size() == 4 {
+			return loong64.AMOVF
+		} else {
+			return loong64.AMOVD
+		}
+	} else {
+		switch t.Size() {
+		case 1:
+			if t.IsSigned() {
+				return loong64.AMOVB
+			} else {
+				return loong64.AMOVBU
+			}
+		case 2:
+			if t.IsSigned() {
+				return loong64.AMOVH
+			} else {
+				return loong64.AMOVHU
+			}
+		case 4:
+			if t.IsSigned() {
+				return loong64.AMOVW
+			} else {
+				return loong64.AMOVWU
+			}
+		case 8:
+			return loong64.AMOVV
+		}
+	}
+	panic("bad load type")
+}
+
+// storeByType returns the store instruction of the given type.
+func storeByType(t *types.Type, r int16) obj.As {
+	if isFPreg(r) {
+		if t.Size() == 4 {
+			return loong64.AMOVF
+		} else {
+			return loong64.AMOVD
+		}
+	} else {
+		switch t.Size() {
+		case 1:
+			return loong64.AMOVB
+		case 2:
+			return loong64.AMOVH
+		case 4:
+			return loong64.AMOVW
+		case 8:
+			return loong64.AMOVV
+		}
+	}
+	panic("bad store type")
+}
+
+func ssaGenValue(s *ssagen.State, v *ssa.Value) {
+	switch v.Op {
+	case ssa.OpCopy, ssa.OpLOONG64MOVVreg:
+		if v.Type.IsMemory() {
+			return
+		}
+		x := v.Args[0].Reg()
+		y := v.Reg()
+		if x == y {
+			return
+		}
+		as := loong64.AMOVV
+		if isFPreg(x) && isFPreg(y) {
+			as = loong64.AMOVD
+		}
+		p := s.Prog(as)
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = x
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = y
+	case ssa.OpLOONG64MOVVnop:
+		// nothing to do
+	case ssa.OpLoadReg:
+		if v.Type.IsFlags() {
+			v.Fatalf("load flags not implemented: %v", v.LongString())
+			return
+		}
+		r := v.Reg()
+		p := s.Prog(loadByType(v.Type, r))
+		ssagen.AddrAuto(&p.From, v.Args[0])
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = r
+	case ssa.OpStoreReg:
+		if v.Type.IsFlags() {
+			v.Fatalf("store flags not implemented: %v", v.LongString())
+			return
+		}
+		r := v.Args[0].Reg()
+		p := s.Prog(storeByType(v.Type, r))
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = r
+		ssagen.AddrAuto(&p.To, v)
+	case ssa.OpLOONG64ADDV,
+		ssa.OpLOONG64SUBV,
+		ssa.OpLOONG64AND,
+		ssa.OpLOONG64OR,
+		ssa.OpLOONG64XOR,
+		ssa.OpLOONG64NOR,
+		ssa.OpLOONG64SLLV,
+		ssa.OpLOONG64SRLV,
+		ssa.OpLOONG64SRAV,
+		ssa.OpLOONG64ROTR,
+		ssa.OpLOONG64ROTRV,
+		ssa.OpLOONG64ADDF,
+		ssa.OpLOONG64ADDD,
+		ssa.OpLOONG64SUBF,
+		ssa.OpLOONG64SUBD,
+		ssa.OpLOONG64MULF,
+		ssa.OpLOONG64MULD,
+		ssa.OpLOONG64DIVF,
+		ssa.OpLOONG64DIVD,
+		ssa.OpLOONG64MULV, ssa.OpLOONG64MULHV, ssa.OpLOONG64MULHVU,
+		ssa.OpLOONG64DIVV, ssa.OpLOONG64REMV, ssa.OpLOONG64DIVVU, ssa.OpLOONG64REMVU:
+		p := s.Prog(v.Op.Asm())
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = v.Args[1].Reg()
+		p.Reg = v.Args[0].Reg()
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg()
+	case ssa.OpLOONG64SGT,
+		ssa.OpLOONG64SGTU:
+		p := s.Prog(v.Op.Asm())
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = v.Args[0].Reg()
+		p.Reg = v.Args[1].Reg()
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg()
+	case ssa.OpLOONG64ADDVconst,
+		ssa.OpLOONG64SUBVconst,
+		ssa.OpLOONG64ANDconst,
+		ssa.OpLOONG64ORconst,
+		ssa.OpLOONG64XORconst,
+		ssa.OpLOONG64NORconst,
+		ssa.OpLOONG64SLLVconst,
+		ssa.OpLOONG64SRLVconst,
+		ssa.OpLOONG64SRAVconst,
+		ssa.OpLOONG64ROTRconst,
+		ssa.OpLOONG64ROTRVconst,
+		ssa.OpLOONG64SGTconst,
+		ssa.OpLOONG64SGTUconst:
+		p := s.Prog(v.Op.Asm())
+		p.From.Type = obj.TYPE_CONST
+		p.From.Offset = v.AuxInt
+		p.Reg = v.Args[0].Reg()
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg()
+	case ssa.OpLOONG64MOVVconst:
+		r := v.Reg()
+		p := s.Prog(v.Op.Asm())
+		p.From.Type = obj.TYPE_CONST
+		p.From.Offset = v.AuxInt
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = r
+		if isFPreg(r) {
+			// cannot move into FP or special registers, use TMP as intermediate
+			p.To.Reg = loong64.REGTMP
+			p = s.Prog(loong64.AMOVV)
+			p.From.Type = obj.TYPE_REG
+			p.From.Reg = loong64.REGTMP
+			p.To.Type = obj.TYPE_REG
+			p.To.Reg = r
+		}
+	case ssa.OpLOONG64MOVFconst,
+		ssa.OpLOONG64MOVDconst:
+		p := s.Prog(v.Op.Asm())
+		p.From.Type = obj.TYPE_FCONST
+		p.From.Val = math.Float64frombits(uint64(v.AuxInt))
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg()
+	case ssa.OpLOONG64CMPEQF,
+		ssa.OpLOONG64CMPEQD,
+		ssa.OpLOONG64CMPGEF,
+		ssa.OpLOONG64CMPGED,
+		ssa.OpLOONG64CMPGTF,
+		ssa.OpLOONG64CMPGTD:
+		p := s.Prog(v.Op.Asm())
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = v.Args[0].Reg()
+		p.Reg = v.Args[1].Reg()
+	case ssa.OpLOONG64MOVVaddr:
+		p := s.Prog(loong64.AMOVV)
+		p.From.Type = obj.TYPE_ADDR
+		p.From.Reg = v.Args[0].Reg()
+		var wantreg string
+		// MOVV $sym+off(base), R
+		// the assembler expands it as the following:
+		// - base is SP: add constant offset to SP (R3)
+		// when constant is large, tmp register (R30) may be used
+		// - base is SB: load external address with relocation
+		switch v.Aux.(type) {
+		default:
+			v.Fatalf("aux is of unknown type %T", v.Aux)
+		case *obj.LSym:
+			wantreg = "SB"
+			ssagen.AddAux(&p.From, v)
+		case *ir.Name:
+			wantreg = "SP"
+			ssagen.AddAux(&p.From, v)
+		case nil:
+			// No sym, just MOVV $off(SP), R
+			wantreg = "SP"
+			p.From.Offset = v.AuxInt
+		}
+		if reg := v.Args[0].RegName(); reg != wantreg {
+			v.Fatalf("bad reg %s for symbol type %T, want %s", reg, v.Aux, wantreg)
+		}
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg()
+	case ssa.OpLOONG64MOVBload,
+		ssa.OpLOONG64MOVBUload,
+		ssa.OpLOONG64MOVHload,
+		ssa.OpLOONG64MOVHUload,
+		ssa.OpLOONG64MOVWload,
+		ssa.OpLOONG64MOVWUload,
+		ssa.OpLOONG64MOVVload,
+		ssa.OpLOONG64MOVFload,
+		ssa.OpLOONG64MOVDload:
+		p := s.Prog(v.Op.Asm())
+		p.From.Type = obj.TYPE_MEM
+		p.From.Reg = v.Args[0].Reg()
+		ssagen.AddAux(&p.From, v)
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg()
+	case ssa.OpLOONG64MOVBstore,
+		ssa.OpLOONG64MOVHstore,
+		ssa.OpLOONG64MOVWstore,
+		ssa.OpLOONG64MOVVstore,
+		ssa.OpLOONG64MOVFstore,
+		ssa.OpLOONG64MOVDstore:
+		p := s.Prog(v.Op.Asm())
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = v.Args[1].Reg()
+		p.To.Type = obj.TYPE_MEM
+		p.To.Reg = v.Args[0].Reg()
+		ssagen.AddAux(&p.To, v)
+	case ssa.OpLOONG64MOVBstorezero,
+		ssa.OpLOONG64MOVHstorezero,
+		ssa.OpLOONG64MOVWstorezero,
+		ssa.OpLOONG64MOVVstorezero:
+		p := s.Prog(v.Op.Asm())
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = loong64.REGZERO
+		p.To.Type = obj.TYPE_MEM
+		p.To.Reg = v.Args[0].Reg()
+		ssagen.AddAux(&p.To, v)
+	case ssa.OpLOONG64MOVBreg,
+		ssa.OpLOONG64MOVBUreg,
+		ssa.OpLOONG64MOVHreg,
+		ssa.OpLOONG64MOVHUreg,
+		ssa.OpLOONG64MOVWreg,
+		ssa.OpLOONG64MOVWUreg:
+		a := v.Args[0]
+		for a.Op == ssa.OpCopy || a.Op == ssa.OpLOONG64MOVVreg {
+			a = a.Args[0]
+		}
+		if a.Op == ssa.OpLoadReg && loong64.REG_R0 <= a.Reg() && a.Reg() <= loong64.REG_R31 {
+			// LoadReg from a narrower type does an extension, except loading
+			// to a floating point register. So only eliminate the extension
+			// if it is loaded to an integer register.
+
+			t := a.Type
+			switch {
+			case v.Op == ssa.OpLOONG64MOVBreg && t.Size() == 1 && t.IsSigned(),
+				v.Op == ssa.OpLOONG64MOVBUreg && t.Size() == 1 && !t.IsSigned(),
+				v.Op == ssa.OpLOONG64MOVHreg && t.Size() == 2 && t.IsSigned(),
+				v.Op == ssa.OpLOONG64MOVHUreg && t.Size() == 2 && !t.IsSigned(),
+				v.Op == ssa.OpLOONG64MOVWreg && t.Size() == 4 && t.IsSigned(),
+				v.Op == ssa.OpLOONG64MOVWUreg && t.Size() == 4 && !t.IsSigned():
+				// arg is a proper-typed load, already zero/sign-extended, don't extend again
+				if v.Reg() == v.Args[0].Reg() {
+					return
+				}
+				p := s.Prog(loong64.AMOVV)
+				p.From.Type = obj.TYPE_REG
+				p.From.Reg = v.Args[0].Reg()
+				p.To.Type = obj.TYPE_REG
+				p.To.Reg = v.Reg()
+				return
+			default:
+			}
+		}
+		fallthrough
+	case ssa.OpLOONG64MOVWF,
+		ssa.OpLOONG64MOVWD,
+		ssa.OpLOONG64TRUNCFW,
+		ssa.OpLOONG64TRUNCDW,
+		ssa.OpLOONG64MOVVF,
+		ssa.OpLOONG64MOVVD,
+		ssa.OpLOONG64TRUNCFV,
+		ssa.OpLOONG64TRUNCDV,
+		ssa.OpLOONG64MOVFD,
+		ssa.OpLOONG64MOVDF,
+		ssa.OpLOONG64NEGF,
+		ssa.OpLOONG64NEGD,
+		ssa.OpLOONG64SQRTD,
+		ssa.OpLOONG64SQRTF:
+		p := s.Prog(v.Op.Asm())
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = v.Args[0].Reg()
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg()
+	case ssa.OpLOONG64NEGV:
+		// SUB from REGZERO
+		p := s.Prog(loong64.ASUBVU)
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = v.Args[0].Reg()
+		p.Reg = loong64.REGZERO
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg()
+	case ssa.OpLOONG64DUFFZERO:
+		// runtime.duffzero expects start address - 8 in R19
+		p := s.Prog(loong64.ASUBVU)
+		p.From.Type = obj.TYPE_CONST
+		p.From.Offset = 8
+		p.Reg = v.Args[0].Reg()
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = loong64.REG_R19
+		p = s.Prog(obj.ADUFFZERO)
+		p.To.Type = obj.TYPE_MEM
+		p.To.Name = obj.NAME_EXTERN
+		p.To.Sym = ir.Syms.Duffzero
+		p.To.Offset = v.AuxInt
+	case ssa.OpLOONG64LoweredZero:
+		// SUBV	$8, R19
+		// MOVV	R0, 8(R19)
+		// ADDV	$8, R19
+		// BNE	Rarg1, R19, -2(PC)
+		// arg1 is the address of the last element to zero
+		var sz int64
+		var mov obj.As
+		switch {
+		case v.AuxInt%8 == 0:
+			sz = 8
+			mov = loong64.AMOVV
+		case v.AuxInt%4 == 0:
+			sz = 4
+			mov = loong64.AMOVW
+		case v.AuxInt%2 == 0:
+			sz = 2
+			mov = loong64.AMOVH
+		default:
+			sz = 1
+			mov = loong64.AMOVB
+		}
+		p := s.Prog(loong64.ASUBVU)
+		p.From.Type = obj.TYPE_CONST
+		p.From.Offset = sz
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = loong64.REG_R19
+		p2 := s.Prog(mov)
+		p2.From.Type = obj.TYPE_REG
+		p2.From.Reg = loong64.REGZERO
+		p2.To.Type = obj.TYPE_MEM
+		p2.To.Reg = loong64.REG_R19
+		p2.To.Offset = sz
+		p3 := s.Prog(loong64.AADDVU)
+		p3.From.Type = obj.TYPE_CONST
+		p3.From.Offset = sz
+		p3.To.Type = obj.TYPE_REG
+		p3.To.Reg = loong64.REG_R19
+		p4 := s.Prog(loong64.ABNE)
+		p4.From.Type = obj.TYPE_REG
+		p4.From.Reg = v.Args[1].Reg()
+		p4.Reg = loong64.REG_R19
+		p4.To.Type = obj.TYPE_BRANCH
+		p4.To.SetTarget(p2)
+	case ssa.OpLOONG64DUFFCOPY:
+		p := s.Prog(obj.ADUFFCOPY)
+		p.To.Type = obj.TYPE_MEM
+		p.To.Name = obj.NAME_EXTERN
+		p.To.Sym = ir.Syms.Duffcopy
+		p.To.Offset = v.AuxInt
+	case ssa.OpLOONG64LoweredMove:
+		// SUBV	$8, R19
+		// MOVV	8(R19), Rtmp
+		// MOVV	Rtmp, (R4)
+		// ADDV	$8, R19
+		// ADDV	$8, R4
+		// BNE	Rarg2, R19, -4(PC)
+		// arg2 is the address of the last element of src
+		var sz int64
+		var mov obj.As
+		switch {
+		case v.AuxInt%8 == 0:
+			sz = 8
+			mov = loong64.AMOVV
+		case v.AuxInt%4 == 0:
+			sz = 4
+			mov = loong64.AMOVW
+		case v.AuxInt%2 == 0:
+			sz = 2
+			mov = loong64.AMOVH
+		default:
+			sz = 1
+			mov = loong64.AMOVB
+		}
+		p := s.Prog(loong64.ASUBVU)
+		p.From.Type = obj.TYPE_CONST
+		p.From.Offset = sz
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = loong64.REG_R19
+		p2 := s.Prog(mov)
+		p2.From.Type = obj.TYPE_MEM
+		p2.From.Reg = loong64.REG_R19
+		p2.From.Offset = sz
+		p2.To.Type = obj.TYPE_REG
+		p2.To.Reg = loong64.REGTMP
+		p3 := s.Prog(mov)
+		p3.From.Type = obj.TYPE_REG
+		p3.From.Reg = loong64.REGTMP
+		p3.To.Type = obj.TYPE_MEM
+		p3.To.Reg = loong64.REG_R4
+		p4 := s.Prog(loong64.AADDVU)
+		p4.From.Type = obj.TYPE_CONST
+		p4.From.Offset = sz
+		p4.To.Type = obj.TYPE_REG
+		p4.To.Reg = loong64.REG_R19
+		p5 := s.Prog(loong64.AADDVU)
+		p5.From.Type = obj.TYPE_CONST
+		p5.From.Offset = sz
+		p5.To.Type = obj.TYPE_REG
+		p5.To.Reg = loong64.REG_R4
+		p6 := s.Prog(loong64.ABNE)
+		p6.From.Type = obj.TYPE_REG
+		p6.From.Reg = v.Args[2].Reg()
+		p6.Reg = loong64.REG_R19
+		p6.To.Type = obj.TYPE_BRANCH
+		p6.To.SetTarget(p2)
+	case ssa.OpLOONG64CALLstatic, ssa.OpLOONG64CALLclosure, ssa.OpLOONG64CALLinter:
+		s.Call(v)
+	case ssa.OpLOONG64CALLtail:
+		s.TailCall(v)
+	case ssa.OpLOONG64LoweredWB:
+		p := s.Prog(obj.ACALL)
+		p.To.Type = obj.TYPE_MEM
+		p.To.Name = obj.NAME_EXTERN
+		// AuxInt encodes how many buffer entries we need.
+		p.To.Sym = ir.Syms.GCWriteBarrier[v.AuxInt-1]
+	case ssa.OpLOONG64LoweredPanicBoundsA, ssa.OpLOONG64LoweredPanicBoundsB, ssa.OpLOONG64LoweredPanicBoundsC:
+		p := s.Prog(obj.ACALL)
+		p.To.Type = obj.TYPE_MEM
+		p.To.Name = obj.NAME_EXTERN
+		p.To.Sym = ssagen.BoundsCheckFunc[v.AuxInt]
+		s.UseArgs(16) // space used in callee args area by assembly stubs
+	case ssa.OpLOONG64LoweredAtomicLoad8, ssa.OpLOONG64LoweredAtomicLoad32, ssa.OpLOONG64LoweredAtomicLoad64:
+		as := loong64.AMOVV
+		switch v.Op {
+		case ssa.OpLOONG64LoweredAtomicLoad8:
+			as = loong64.AMOVB
+		case ssa.OpLOONG64LoweredAtomicLoad32:
+			as = loong64.AMOVW
+		}
+		s.Prog(loong64.ADBAR)
+		p := s.Prog(as)
+		p.From.Type = obj.TYPE_MEM
+		p.From.Reg = v.Args[0].Reg()
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg0()
+		s.Prog(loong64.ADBAR)
+	case ssa.OpLOONG64LoweredAtomicStore8, ssa.OpLOONG64LoweredAtomicStore32, ssa.OpLOONG64LoweredAtomicStore64:
+		as := loong64.AMOVV
+		switch v.Op {
+		case ssa.OpLOONG64LoweredAtomicStore8:
+			as = loong64.AMOVB
+		case ssa.OpLOONG64LoweredAtomicStore32:
+			as = loong64.AMOVW
+		}
+		s.Prog(loong64.ADBAR)
+		p := s.Prog(as)
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = v.Args[1].Reg()
+		p.To.Type = obj.TYPE_MEM
+		p.To.Reg = v.Args[0].Reg()
+		s.Prog(loong64.ADBAR)
+	case ssa.OpLOONG64LoweredAtomicStorezero32, ssa.OpLOONG64LoweredAtomicStorezero64:
+		as := loong64.AMOVV
+		if v.Op == ssa.OpLOONG64LoweredAtomicStorezero32 {
+			as = loong64.AMOVW
+		}
+		s.Prog(loong64.ADBAR)
+		p := s.Prog(as)
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = loong64.REGZERO
+		p.To.Type = obj.TYPE_MEM
+		p.To.Reg = v.Args[0].Reg()
+		s.Prog(loong64.ADBAR)
+	case ssa.OpLOONG64LoweredAtomicExchange32, ssa.OpLOONG64LoweredAtomicExchange64:
+		// DBAR
+		// MOVV	Rarg1, Rtmp
+		// LL	(Rarg0), Rout
+		// SC	Rtmp, (Rarg0)
+		// BEQ	Rtmp, -3(PC)
+		// DBAR
+		ll := loong64.ALLV
+		sc := loong64.ASCV
+		if v.Op == ssa.OpLOONG64LoweredAtomicExchange32 {
+			ll = loong64.ALL
+			sc = loong64.ASC
+		}
+		s.Prog(loong64.ADBAR)
+		p := s.Prog(loong64.AMOVV)
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = v.Args[1].Reg()
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = loong64.REGTMP
+		p1 := s.Prog(ll)
+		p1.From.Type = obj.TYPE_MEM
+		p1.From.Reg = v.Args[0].Reg()
+		p1.To.Type = obj.TYPE_REG
+		p1.To.Reg = v.Reg0()
+		p2 := s.Prog(sc)
+		p2.From.Type = obj.TYPE_REG
+		p2.From.Reg = loong64.REGTMP
+		p2.To.Type = obj.TYPE_MEM
+		p2.To.Reg = v.Args[0].Reg()
+		p3 := s.Prog(loong64.ABEQ)
+		p3.From.Type = obj.TYPE_REG
+		p3.From.Reg = loong64.REGTMP
+		p3.To.Type = obj.TYPE_BRANCH
+		p3.To.SetTarget(p)
+		s.Prog(loong64.ADBAR)
+	case ssa.OpLOONG64LoweredAtomicAdd32, ssa.OpLOONG64LoweredAtomicAdd64:
+		// DBAR
+		// LL	(Rarg0), Rout
+		// ADDV Rarg1, Rout, Rtmp
+		// SC	Rtmp, (Rarg0)
+		// BEQ	Rtmp, -3(PC)
+		// DBAR
+		// ADDV Rarg1, Rout
+		ll := loong64.ALLV
+		sc := loong64.ASCV
+		if v.Op == ssa.OpLOONG64LoweredAtomicAdd32 {
+			ll = loong64.ALL
+			sc = loong64.ASC
+		}
+		s.Prog(loong64.ADBAR)
+		p := s.Prog(ll)
+		p.From.Type = obj.TYPE_MEM
+		p.From.Reg = v.Args[0].Reg()
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg0()
+		p1 := s.Prog(loong64.AADDVU)
+		p1.From.Type = obj.TYPE_REG
+		p1.From.Reg = v.Args[1].Reg()
+		p1.Reg = v.Reg0()
+		p1.To.Type = obj.TYPE_REG
+		p1.To.Reg = loong64.REGTMP
+		p2 := s.Prog(sc)
+		p2.From.Type = obj.TYPE_REG
+		p2.From.Reg = loong64.REGTMP
+		p2.To.Type = obj.TYPE_MEM
+		p2.To.Reg = v.Args[0].Reg()
+		p3 := s.Prog(loong64.ABEQ)
+		p3.From.Type = obj.TYPE_REG
+		p3.From.Reg = loong64.REGTMP
+		p3.To.Type = obj.TYPE_BRANCH
+		p3.To.SetTarget(p)
+		s.Prog(loong64.ADBAR)
+		p4 := s.Prog(loong64.AADDVU)
+		p4.From.Type = obj.TYPE_REG
+		p4.From.Reg = v.Args[1].Reg()
+		p4.Reg = v.Reg0()
+		p4.To.Type = obj.TYPE_REG
+		p4.To.Reg = v.Reg0()
+	case ssa.OpLOONG64LoweredAtomicAddconst32, ssa.OpLOONG64LoweredAtomicAddconst64:
+		// DBAR
+		// LL	(Rarg0), Rout
+		// ADDV $auxint, Rout, Rtmp
+		// SC	Rtmp, (Rarg0)
+		// BEQ	Rtmp, -3(PC)
+		// DBAR
+		// ADDV $auxint, Rout
+		ll := loong64.ALLV
+		sc := loong64.ASCV
+		if v.Op == ssa.OpLOONG64LoweredAtomicAddconst32 {
+			ll = loong64.ALL
+			sc = loong64.ASC
+		}
+		s.Prog(loong64.ADBAR)
+		p := s.Prog(ll)
+		p.From.Type = obj.TYPE_MEM
+		p.From.Reg = v.Args[0].Reg()
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg0()
+		p1 := s.Prog(loong64.AADDVU)
+		p1.From.Type = obj.TYPE_CONST
+		p1.From.Offset = v.AuxInt
+		p1.Reg = v.Reg0()
+		p1.To.Type = obj.TYPE_REG
+		p1.To.Reg = loong64.REGTMP
+		p2 := s.Prog(sc)
+		p2.From.Type = obj.TYPE_REG
+		p2.From.Reg = loong64.REGTMP
+		p2.To.Type = obj.TYPE_MEM
+		p2.To.Reg = v.Args[0].Reg()
+		p3 := s.Prog(loong64.ABEQ)
+		p3.From.Type = obj.TYPE_REG
+		p3.From.Reg = loong64.REGTMP
+		p3.To.Type = obj.TYPE_BRANCH
+		p3.To.SetTarget(p)
+		s.Prog(loong64.ADBAR)
+		p4 := s.Prog(loong64.AADDVU)
+		p4.From.Type = obj.TYPE_CONST
+		p4.From.Offset = v.AuxInt
+		p4.Reg = v.Reg0()
+		p4.To.Type = obj.TYPE_REG
+		p4.To.Reg = v.Reg0()
+	case ssa.OpLOONG64LoweredAtomicCas32, ssa.OpLOONG64LoweredAtomicCas64:
+		// MOVV $0, Rout
+		// DBAR
+		// LL	(Rarg0), Rtmp
+		// BNE	Rtmp, Rarg1, 4(PC)
+		// MOVV Rarg2, Rout
+		// SC	Rout, (Rarg0)
+		// BEQ	Rout, -4(PC)
+		// DBAR
+		ll := loong64.ALLV
+		sc := loong64.ASCV
+		if v.Op == ssa.OpLOONG64LoweredAtomicCas32 {
+			ll = loong64.ALL
+			sc = loong64.ASC
+		}
+		p := s.Prog(loong64.AMOVV)
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = loong64.REGZERO
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg0()
+		s.Prog(loong64.ADBAR)
+		p1 := s.Prog(ll)
+		p1.From.Type = obj.TYPE_MEM
+		p1.From.Reg = v.Args[0].Reg()
+		p1.To.Type = obj.TYPE_REG
+		p1.To.Reg = loong64.REGTMP
+		p2 := s.Prog(loong64.ABNE)
+		p2.From.Type = obj.TYPE_REG
+		p2.From.Reg = v.Args[1].Reg()
+		p2.Reg = loong64.REGTMP
+		p2.To.Type = obj.TYPE_BRANCH
+		p3 := s.Prog(loong64.AMOVV)
+		p3.From.Type = obj.TYPE_REG
+		p3.From.Reg = v.Args[2].Reg()
+		p3.To.Type = obj.TYPE_REG
+		p3.To.Reg = v.Reg0()
+		p4 := s.Prog(sc)
+		p4.From.Type = obj.TYPE_REG
+		p4.From.Reg = v.Reg0()
+		p4.To.Type = obj.TYPE_MEM
+		p4.To.Reg = v.Args[0].Reg()
+		p5 := s.Prog(loong64.ABEQ)
+		p5.From.Type = obj.TYPE_REG
+		p5.From.Reg = v.Reg0()
+		p5.To.Type = obj.TYPE_BRANCH
+		p5.To.SetTarget(p1)
+		p6 := s.Prog(loong64.ADBAR)
+		p2.To.SetTarget(p6)
+	case ssa.OpLOONG64LoweredNilCheck:
+		// Issue a load which will fault if arg is nil.
+		p := s.Prog(loong64.AMOVB)
+		p.From.Type = obj.TYPE_MEM
+		p.From.Reg = v.Args[0].Reg()
+		ssagen.AddAux(&p.From, v)
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = loong64.REGTMP
+		if logopt.Enabled() {
+			logopt.LogOpt(v.Pos, "nilcheck", "genssa", v.Block.Func.Name)
+		}
+		if base.Debug.Nil != 0 && v.Pos.Line() > 1 { // v.Pos.Line()==1 in generated wrappers
+			base.WarnfAt(v.Pos, "generated nil check")
+		}
+	case ssa.OpLOONG64FPFlagTrue,
+		ssa.OpLOONG64FPFlagFalse:
+		// MOVV	$0, r
+		// BFPF	2(PC)
+		// MOVV	$1, r
+		branch := loong64.ABFPF
+		if v.Op == ssa.OpLOONG64FPFlagFalse {
+			branch = loong64.ABFPT
+		}
+		p := s.Prog(loong64.AMOVV)
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = loong64.REGZERO
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg()
+		p2 := s.Prog(branch)
+		p2.To.Type = obj.TYPE_BRANCH
+		p3 := s.Prog(loong64.AMOVV)
+		p3.From.Type = obj.TYPE_CONST
+		p3.From.Offset = 1
+		p3.To.Type = obj.TYPE_REG
+		p3.To.Reg = v.Reg()
+		p4 := s.Prog(obj.ANOP) // not a machine instruction, for branch to land
+		p2.To.SetTarget(p4)
+	case ssa.OpLOONG64LoweredGetClosurePtr:
+		// Closure pointer is R22 (loong64.REGCTXT).
+		ssagen.CheckLoweredGetClosurePtr(v)
+	case ssa.OpLOONG64LoweredGetCallerSP:
+		// caller's SP is FixedFrameSize below the address of the first arg
+		p := s.Prog(loong64.AMOVV)
+		p.From.Type = obj.TYPE_ADDR
+		p.From.Offset = -base.Ctxt.Arch.FixedFrameSize
+		p.From.Name = obj.NAME_PARAM
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg()
+	case ssa.OpLOONG64LoweredGetCallerPC:
+		p := s.Prog(obj.AGETCALLERPC)
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg()
+	case ssa.OpLOONG64MASKEQZ, ssa.OpLOONG64MASKNEZ:
+		p := s.Prog(v.Op.Asm())
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = v.Args[1].Reg()
+		p.Reg = v.Args[0].Reg()
+		p.To.Type = obj.TYPE_REG
+		p.To.Reg = v.Reg()
+	case ssa.OpClobber, ssa.OpClobberReg:
+		// TODO: implement for clobberdead experiment. Nop is ok for now.
+	default:
+		v.Fatalf("genValue not implemented: %s", v.LongString())
+	}
+}
+
+var blockJump = map[ssa.BlockKind]struct {
+	asm, invasm obj.As
+}{
+	ssa.BlockLOONG64EQ:  {loong64.ABEQ, loong64.ABNE},
+	ssa.BlockLOONG64NE:  {loong64.ABNE, loong64.ABEQ},
+	ssa.BlockLOONG64LTZ: {loong64.ABLTZ, loong64.ABGEZ},
+	ssa.BlockLOONG64GEZ: {loong64.ABGEZ, loong64.ABLTZ},
+	ssa.BlockLOONG64LEZ: {loong64.ABLEZ, loong64.ABGTZ},
+	ssa.BlockLOONG64GTZ: {loong64.ABGTZ, loong64.ABLEZ},
+	ssa.BlockLOONG64FPT: {loong64.ABFPT, loong64.ABFPF},
+	ssa.BlockLOONG64FPF: {loong64.ABFPF, loong64.ABFPT},
+}
+
+func ssaGenBlock(s *ssagen.State, b, next *ssa.Block) {
+	switch b.Kind {
+	case ssa.BlockPlain:
+		if b.Succs[0].Block() != next {
+			p := s.Prog(obj.AJMP)
+			p.To.Type = obj.TYPE_BRANCH
+			s.Branches = append(s.Branches, ssagen.Branch{P: p, B: b.Succs[0].Block()})
+		}
+	case ssa.BlockDefer:
+		// defer returns in R19:
+		// 0 if we should continue executing
+		// 1 if we should jump to deferreturn call
+		p := s.Prog(loong64.ABNE)
+		p.From.Type = obj.TYPE_REG
+		p.From.Reg = loong64.REGZERO
+		p.Reg = loong64.REG_R19
+		p.To.Type = obj.TYPE_BRANCH
+		s.Branches = append(s.Branches, ssagen.Branch{P: p, B: b.Succs[1].Block()})
+		if b.Succs[0].Block() != next {
+			p := s.Prog(obj.AJMP)
+			p.To.Type = obj.TYPE_BRANCH
+			s.Branches = append(s.Branches, ssagen.Branch{P: p, B: b.Succs[0].Block()})
+		}
+	case ssa.BlockExit, ssa.BlockRetJmp:
+	case ssa.BlockRet:
+		s.Prog(obj.ARET)
+	case ssa.BlockLOONG64EQ, ssa.BlockLOONG64NE,
+		ssa.BlockLOONG64LTZ, ssa.BlockLOONG64GEZ,
+		ssa.BlockLOONG64LEZ, ssa.BlockLOONG64GTZ,
+		ssa.BlockLOONG64FPT, ssa.BlockLOONG64FPF:
+		jmp := blockJump[b.Kind]
+		var p *obj.Prog
+		switch next {
+		case b.Succs[0].Block():
+			p = s.Br(jmp.invasm, b.Succs[1].Block())
+		case b.Succs[1].Block():
+			p = s.Br(jmp.asm, b.Succs[0].Block())
+		default:
+			if b.Likely != ssa.BranchUnlikely {
+				p = s.Br(jmp.asm, b.Succs[0].Block())
+				s.Br(obj.AJMP, b.Succs[1].Block())
+			} else {
+				p = s.Br(jmp.invasm, b.Succs[1].Block())
+				s.Br(obj.AJMP, b.Succs[0].Block())
+			}
+		}
+		if !b.Controls[0].Type.IsFlags() {
+			p.From.Type = obj.TYPE_REG
+			p.From.Reg = b.Controls[0].Reg()
+		}
+	default:
+		b.Fatalf("branch not implemented: %s", b.LongString())
+	}
+}