// Copyright 2016 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 arm

import (
	"math"

	"cmd/compile/internal/gc"
	"cmd/compile/internal/ssa"
	"cmd/internal/obj"
	"cmd/internal/obj/arm"
)

var ssaRegToReg = []int16{
	arm.REG_R0,
	arm.REG_R1,
	arm.REG_R2,
	arm.REG_R3,
	arm.REG_R4,
	arm.REG_R5,
	arm.REG_R6,
	arm.REG_R7,
	arm.REG_R8,
	arm.REG_R9,
	arm.REGG, // aka R10
	arm.REG_R11,
	arm.REG_R12,
	arm.REGSP, // aka R13
	arm.REG_R14,
	arm.REG_R15,

	arm.REG_F0,
	arm.REG_F1,
	arm.REG_F2,
	arm.REG_F3,
	arm.REG_F4,
	arm.REG_F5,
	arm.REG_F6,
	arm.REG_F7,
	arm.REG_F8,
	arm.REG_F9,
	arm.REG_F10,
	arm.REG_F11,
	arm.REG_F12,
	arm.REG_F13,
	arm.REG_F14,
	arm.REG_F15,

	arm.REG_CPSR, // flag
	0,            // SB isn't a real register.  We fill an Addr.Reg field with 0 in this case.
}

// Smallest possible faulting page at address zero,
// see ../../../../runtime/internal/sys/arch_arm.go
const minZeroPage = 4096

// loadByType returns the load instruction of the given type.
func loadByType(t ssa.Type) obj.As {
	if t.IsFloat() {
		switch t.Size() {
		case 4:
			return arm.AMOVF
		case 8:
			return arm.AMOVD
		}
	} else {
		switch t.Size() {
		case 1:
			if t.IsSigned() {
				return arm.AMOVB
			} else {
				return arm.AMOVBU
			}
		case 2:
			if t.IsSigned() {
				return arm.AMOVH
			} else {
				return arm.AMOVHU
			}
		case 4:
			return arm.AMOVW
		}
	}
	panic("bad load type")
}

// storeByType returns the store instruction of the given type.
func storeByType(t ssa.Type) obj.As {
	if t.IsFloat() {
		switch t.Size() {
		case 4:
			return arm.AMOVF
		case 8:
			return arm.AMOVD
		}
	} else {
		switch t.Size() {
		case 1:
			return arm.AMOVB
		case 2:
			return arm.AMOVH
		case 4:
			return arm.AMOVW
		}
	}
	panic("bad store type")
}

func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
	s.SetLineno(v.Line)
	switch v.Op {
	case ssa.OpInitMem:
		// memory arg needs no code
	case ssa.OpArg:
		// input args need no code
	case ssa.OpSP, ssa.OpSB, ssa.OpGetG:
		// nothing to do
	case ssa.OpCopy, ssa.OpARMMOVWconvert, ssa.OpARMMOVWreg:
		if v.Type.IsMemory() {
			return
		}
		x := gc.SSARegNum(v.Args[0])
		y := gc.SSARegNum(v)
		if x == y {
			return
		}
		as := arm.AMOVW
		if v.Type.IsFloat() {
			switch v.Type.Size() {
			case 4:
				as = arm.AMOVF
			case 8:
				as = arm.AMOVD
			default:
				panic("bad float size")
			}
		}
		p := gc.Prog(as)
		p.From.Type = obj.TYPE_REG
		p.From.Reg = x
		p.To.Type = obj.TYPE_REG
		p.To.Reg = y
	case ssa.OpLoadReg:
		if v.Type.IsFlags() {
			v.Unimplementedf("load flags not implemented: %v", v.LongString())
			return
		}
		p := gc.Prog(loadByType(v.Type))
		n, off := gc.AutoVar(v.Args[0])
		p.From.Type = obj.TYPE_MEM
		p.From.Node = n
		p.From.Sym = gc.Linksym(n.Sym)
		p.From.Offset = off
		if n.Class == gc.PPARAM || n.Class == gc.PPARAMOUT {
			p.From.Name = obj.NAME_PARAM
			p.From.Offset += n.Xoffset
		} else {
			p.From.Name = obj.NAME_AUTO
		}
		p.To.Type = obj.TYPE_REG
		p.To.Reg = gc.SSARegNum(v)
	case ssa.OpPhi:
		gc.CheckLoweredPhi(v)
	case ssa.OpStoreReg:
		if v.Type.IsFlags() {
			v.Unimplementedf("store flags not implemented: %v", v.LongString())
			return
		}
		p := gc.Prog(storeByType(v.Type))
		p.From.Type = obj.TYPE_REG
		p.From.Reg = gc.SSARegNum(v.Args[0])
		n, off := gc.AutoVar(v)
		p.To.Type = obj.TYPE_MEM
		p.To.Node = n
		p.To.Sym = gc.Linksym(n.Sym)
		p.To.Offset = off
		if n.Class == gc.PPARAM || n.Class == gc.PPARAMOUT {
			p.To.Name = obj.NAME_PARAM
			p.To.Offset += n.Xoffset
		} else {
			p.To.Name = obj.NAME_AUTO
		}
	case ssa.OpARMDIV,
		ssa.OpARMDIVU,
		ssa.OpARMMOD,
		ssa.OpARMMODU:
		// Note: for software division the assembler rewrite these
		// instructions to sequence of instructions:
		// - it puts numerator in R11 and denominator in g.m.divmod
		//	and call (say) _udiv
		// - _udiv saves R0-R3 on stack and call udiv, restores R0-R3
		//	before return
		// - udiv does the actual work
		//TODO: set approperiate regmasks and call udiv directly?
		// need to be careful for negative case
		// Or, as soft div is already expensive, we don't care?
		fallthrough
	case ssa.OpARMADD,
		ssa.OpARMADC,
		ssa.OpARMSUB,
		ssa.OpARMSBC,
		ssa.OpARMRSB,
		ssa.OpARMAND,
		ssa.OpARMOR,
		ssa.OpARMXOR,
		ssa.OpARMBIC,
		ssa.OpARMMUL,
		ssa.OpARMADDF,
		ssa.OpARMADDD,
		ssa.OpARMSUBF,
		ssa.OpARMSUBD,
		ssa.OpARMMULF,
		ssa.OpARMMULD,
		ssa.OpARMDIVF,
		ssa.OpARMDIVD:
		r := gc.SSARegNum(v)
		r1 := gc.SSARegNum(v.Args[0])
		r2 := gc.SSARegNum(v.Args[1])
		p := gc.Prog(v.Op.Asm())
		p.From.Type = obj.TYPE_REG
		p.From.Reg = r2
		p.Reg = r1
		p.To.Type = obj.TYPE_REG
		p.To.Reg = r
	case ssa.OpARMADDS,
		ssa.OpARMSUBS:
		r := gc.SSARegNum(v)
		r1 := gc.SSARegNum(v.Args[0])
		r2 := gc.SSARegNum(v.Args[1])
		p := gc.Prog(v.Op.Asm())
		p.Scond = arm.C_SBIT
		p.From.Type = obj.TYPE_REG
		p.From.Reg = r2
		p.Reg = r1
		p.To.Type = obj.TYPE_REG
		p.To.Reg = r
	case ssa.OpARMSLL,
		ssa.OpARMSRL:
		// ARM shift instructions uses only the low-order byte of the shift amount
		// generate conditional instructions to deal with large shifts
		// CMP	$32, Rarg1
		// SLL	Rarg1, Rarg0, Rdst
		// MOVW.HS	$0, Rdst
		r := gc.SSARegNum(v)
		r1 := gc.SSARegNum(v.Args[0])
		r2 := gc.SSARegNum(v.Args[1])
		p := gc.Prog(arm.ACMP)
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = 32
		p.Reg = r2
		p = gc.Prog(v.Op.Asm())
		p.From.Type = obj.TYPE_REG
		p.From.Reg = r2
		p.Reg = r1
		p.To.Type = obj.TYPE_REG
		p.To.Reg = r
		p = gc.Prog(arm.AMOVW)
		p.Scond = arm.C_SCOND_HS
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = 0
		p.To.Type = obj.TYPE_REG
		p.To.Reg = r
	case ssa.OpARMSRA:
		// ARM shift instructions uses only the low-order byte of the shift amount
		// generate conditional instructions to deal with large shifts
		// CMP	$32, Rarg1
		// SRA.HS	$31, Rarg0, Rdst // shift 31 bits to get the sign bit
		// SRA.LO	Rarg1, Rarg0, Rdst
		r := gc.SSARegNum(v)
		r1 := gc.SSARegNum(v.Args[0])
		r2 := gc.SSARegNum(v.Args[1])
		p := gc.Prog(arm.ACMP)
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = 32
		p.Reg = r2
		p = gc.Prog(arm.ASRA)
		p.Scond = arm.C_SCOND_HS
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = 31
		p.Reg = r1
		p.To.Type = obj.TYPE_REG
		p.To.Reg = r
		p = gc.Prog(arm.ASRA)
		p.Scond = arm.C_SCOND_LO
		p.From.Type = obj.TYPE_REG
		p.From.Reg = r2
		p.Reg = r1
		p.To.Type = obj.TYPE_REG
		p.To.Reg = r
	case ssa.OpARMADDconst,
		ssa.OpARMADCconst,
		ssa.OpARMSUBconst,
		ssa.OpARMSBCconst,
		ssa.OpARMRSBconst,
		ssa.OpARMRSCconst,
		ssa.OpARMANDconst,
		ssa.OpARMORconst,
		ssa.OpARMXORconst,
		ssa.OpARMBICconst,
		ssa.OpARMSLLconst,
		ssa.OpARMSRLconst,
		ssa.OpARMSRAconst:
		p := gc.Prog(v.Op.Asm())
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = v.AuxInt
		p.Reg = gc.SSARegNum(v.Args[0])
		p.To.Type = obj.TYPE_REG
		p.To.Reg = gc.SSARegNum(v)
	case ssa.OpARMADDSconst,
		ssa.OpARMSUBSconst,
		ssa.OpARMRSBSconst:
		p := gc.Prog(v.Op.Asm())
		p.Scond = arm.C_SBIT
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = v.AuxInt
		p.Reg = gc.SSARegNum(v.Args[0])
		p.To.Type = obj.TYPE_REG
		p.To.Reg = gc.SSARegNum(v)
	case ssa.OpARMSRRconst:
		p := gc.Prog(arm.AMOVW)
		p.From.Type = obj.TYPE_SHIFT
		p.From.Offset = int64(gc.SSARegNum(v.Args[0])&0xf) | arm.SHIFT_RR | (v.AuxInt&31)<<7
		p.To.Type = obj.TYPE_REG
		p.To.Reg = gc.SSARegNum(v)
	case ssa.OpARMHMUL,
		ssa.OpARMHMULU:
		// 32-bit high multiplication
		p := gc.Prog(v.Op.Asm())
		p.From.Type = obj.TYPE_REG
		p.From.Reg = gc.SSARegNum(v.Args[0])
		p.Reg = gc.SSARegNum(v.Args[1])
		p.To.Type = obj.TYPE_REGREG
		p.To.Reg = gc.SSARegNum(v)
		p.To.Offset = arm.REGTMP // throw away low 32-bit into tmp register
	case ssa.OpARMMULLU:
		// 32-bit multiplication, results 64-bit, low 32-bit in reg(v), high 32-bit in R0
		p := gc.Prog(v.Op.Asm())
		p.From.Type = obj.TYPE_REG
		p.From.Reg = gc.SSARegNum(v.Args[0])
		p.Reg = gc.SSARegNum(v.Args[1])
		p.To.Type = obj.TYPE_REGREG
		p.To.Reg = arm.REG_R0                // high 32-bit
		p.To.Offset = int64(gc.SSARegNum(v)) // low 32-bit
	case ssa.OpARMMULA:
		p := gc.Prog(v.Op.Asm())
		p.From.Type = obj.TYPE_REG
		p.From.Reg = gc.SSARegNum(v.Args[0])
		p.Reg = gc.SSARegNum(v.Args[1])
		p.To.Type = obj.TYPE_REGREG2
		p.To.Reg = gc.SSARegNum(v)                   // result
		p.To.Offset = int64(gc.SSARegNum(v.Args[2])) // addend
	case ssa.OpARMMOVWconst:
		p := gc.Prog(v.Op.Asm())
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = v.AuxInt
		p.To.Type = obj.TYPE_REG
		p.To.Reg = gc.SSARegNum(v)
	case ssa.OpARMMOVFconst,
		ssa.OpARMMOVDconst:
		p := gc.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 = gc.SSARegNum(v)
	case ssa.OpARMCMP,
		ssa.OpARMCMN,
		ssa.OpARMTST,
		ssa.OpARMTEQ,
		ssa.OpARMCMPF,
		ssa.OpARMCMPD:
		p := gc.Prog(v.Op.Asm())
		p.From.Type = obj.TYPE_REG
		// Special layout in ARM assembly
		// Comparing to x86, the operands of ARM's CMP are reversed.
		p.From.Reg = gc.SSARegNum(v.Args[1])
		p.Reg = gc.SSARegNum(v.Args[0])
	case ssa.OpARMCMPconst,
		ssa.OpARMCMNconst,
		ssa.OpARMTSTconst,
		ssa.OpARMTEQconst:
		// Special layout in ARM assembly
		p := gc.Prog(v.Op.Asm())
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = v.AuxInt
		p.Reg = gc.SSARegNum(v.Args[0])
	case ssa.OpARMMOVWaddr:
		p := gc.Prog(arm.AMOVW)
		p.From.Type = obj.TYPE_ADDR
		p.To.Type = obj.TYPE_REG
		p.To.Reg = gc.SSARegNum(v)

		var wantreg string
		// MOVW $sym+off(base), R
		// the assembler expands it as the following:
		// - base is SP: add constant offset to SP (R13)
		//               when constant is large, tmp register (R11) may be used
		// - base is SB: load external address from constant pool (use relocation)
		switch v.Aux.(type) {
		default:
			v.Fatalf("aux is of unknown type %T", v.Aux)
		case *ssa.ExternSymbol:
			wantreg = "SB"
			gc.AddAux(&p.From, v)
		case *ssa.ArgSymbol, *ssa.AutoSymbol:
			wantreg = "SP"
			gc.AddAux(&p.From, v)
		case nil:
			// No sym, just MOVW $off(SP), R
			wantreg = "SP"
			p.From.Reg = arm.REGSP
			p.From.Offset = v.AuxInt
		}
		if reg := gc.SSAReg(v.Args[0]); reg.Name() != wantreg {
			v.Fatalf("bad reg %s for symbol type %T, want %s", reg.Name(), v.Aux, wantreg)
		}

	case ssa.OpARMMOVBload,
		ssa.OpARMMOVBUload,
		ssa.OpARMMOVHload,
		ssa.OpARMMOVHUload,
		ssa.OpARMMOVWload,
		ssa.OpARMMOVFload,
		ssa.OpARMMOVDload:
		p := gc.Prog(v.Op.Asm())
		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 = gc.SSARegNum(v)
	case ssa.OpARMMOVBstore,
		ssa.OpARMMOVHstore,
		ssa.OpARMMOVWstore,
		ssa.OpARMMOVFstore,
		ssa.OpARMMOVDstore:
		p := gc.Prog(v.Op.Asm())
		p.From.Type = obj.TYPE_REG
		p.From.Reg = gc.SSARegNum(v.Args[1])
		p.To.Type = obj.TYPE_MEM
		p.To.Reg = gc.SSARegNum(v.Args[0])
		gc.AddAux(&p.To, v)
	case ssa.OpARMMOVBreg,
		ssa.OpARMMOVBUreg,
		ssa.OpARMMOVHreg,
		ssa.OpARMMOVHUreg,
		ssa.OpARMMVN,
		ssa.OpARMSQRTD,
		ssa.OpARMMOVWF,
		ssa.OpARMMOVWD,
		ssa.OpARMMOVFW,
		ssa.OpARMMOVDW,
		ssa.OpARMMOVFD,
		ssa.OpARMMOVDF:
		p := gc.Prog(v.Op.Asm())
		p.From.Type = obj.TYPE_REG
		p.From.Reg = gc.SSARegNum(v.Args[0])
		p.To.Type = obj.TYPE_REG
		p.To.Reg = gc.SSARegNum(v)
	case ssa.OpARMMOVWUF,
		ssa.OpARMMOVWUD,
		ssa.OpARMMOVFWU,
		ssa.OpARMMOVDWU:
		p := gc.Prog(v.Op.Asm())
		p.Scond = arm.C_UBIT
		p.From.Type = obj.TYPE_REG
		p.From.Reg = gc.SSARegNum(v.Args[0])
		p.To.Type = obj.TYPE_REG
		p.To.Reg = gc.SSARegNum(v)
	case ssa.OpARMCALLstatic:
		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 an actual hardware NOP 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.
			ginsnop()
		}
		p := gc.Prog(obj.ACALL)
		p.To.Type = obj.TYPE_MEM
		p.To.Name = obj.NAME_EXTERN
		p.To.Sym = gc.Linksym(v.Aux.(*gc.Sym))
		if gc.Maxarg < v.AuxInt {
			gc.Maxarg = v.AuxInt
		}
	case ssa.OpARMCALLclosure:
		p := gc.Prog(obj.ACALL)
		p.To.Type = obj.TYPE_MEM
		p.To.Offset = 0
		p.To.Reg = gc.SSARegNum(v.Args[0])
		if gc.Maxarg < v.AuxInt {
			gc.Maxarg = v.AuxInt
		}
	case ssa.OpARMCALLdefer:
		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.OpARMCALLgo:
		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.OpARMCALLinter:
		p := gc.Prog(obj.ACALL)
		p.To.Type = obj.TYPE_MEM
		p.To.Offset = 0
		p.To.Reg = gc.SSARegNum(v.Args[0])
		if gc.Maxarg < v.AuxInt {
			gc.Maxarg = v.AuxInt
		}
	case ssa.OpARMDUFFZERO:
		p := gc.Prog(obj.ADUFFZERO)
		p.To.Type = obj.TYPE_MEM
		p.To.Name = obj.NAME_EXTERN
		p.To.Sym = gc.Linksym(gc.Pkglookup("duffzero", gc.Runtimepkg))
		p.To.Offset = v.AuxInt
	case ssa.OpARMDUFFCOPY:
		p := gc.Prog(obj.ADUFFCOPY)
		p.To.Type = obj.TYPE_MEM
		p.To.Name = obj.NAME_EXTERN
		p.To.Sym = gc.Linksym(gc.Pkglookup("duffcopy", gc.Runtimepkg))
		p.To.Offset = v.AuxInt
	case ssa.OpARMLoweredNilCheck:
		// 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(arm.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 = arm.REGTMP
		if gc.Debug_checknil != 0 && v.Line > 1 { // v.Line==1 in generated wrappers
			gc.Warnl(v.Line, "generated nil check")
		}
	case ssa.OpARMLoweredZero, ssa.OpARMLoweredZeroU:
		// MOVW.P	Rarg2, 4(R1)
		// CMP	Rarg1, R1
		// BLT	-2(PC)
		// arg1 is the end of memory to zero
		// arg2 is known to be zero
		var sz int64 = 4
		mov := arm.AMOVW
		if v.Op == ssa.OpARMLoweredZeroU { // unaligned
			sz = 1
			mov = arm.AMOVB
		}
		p := gc.Prog(mov)
		p.Scond = arm.C_PBIT
		p.From.Type = obj.TYPE_REG
		p.From.Reg = gc.SSARegNum(v.Args[2])
		p.To.Type = obj.TYPE_MEM
		p.To.Reg = arm.REG_R1
		p.To.Offset = sz
		p2 := gc.Prog(arm.ACMP)
		p2.From.Type = obj.TYPE_REG
		p2.From.Reg = gc.SSARegNum(v.Args[1])
		p2.Reg = arm.REG_R1
		p3 := gc.Prog(arm.ABLT)
		p3.To.Type = obj.TYPE_BRANCH
		gc.Patch(p3, p)
	case ssa.OpARMLoweredMove, ssa.OpARMLoweredMoveU:
		// MOVW.P	4(R1), Rtmp
		// MOVW.P	Rtmp, 4(R2)
		// CMP	Rarg2, R1
		// BLT	-3(PC)
		// arg2 is the end of src
		var sz int64 = 4
		mov := arm.AMOVW
		if v.Op == ssa.OpARMLoweredMoveU { // unaligned
			sz = 1
			mov = arm.AMOVB
		}
		p := gc.Prog(mov)
		p.Scond = arm.C_PBIT
		p.From.Type = obj.TYPE_MEM
		p.From.Reg = arm.REG_R1
		p.From.Offset = sz
		p.To.Type = obj.TYPE_REG
		p.To.Reg = arm.REGTMP
		p2 := gc.Prog(mov)
		p2.Scond = arm.C_PBIT
		p2.From.Type = obj.TYPE_REG
		p2.From.Reg = arm.REGTMP
		p2.To.Type = obj.TYPE_MEM
		p2.To.Reg = arm.REG_R2
		p2.To.Offset = sz
		p3 := gc.Prog(arm.ACMP)
		p3.From.Type = obj.TYPE_REG
		p3.From.Reg = gc.SSARegNum(v.Args[2])
		p3.Reg = arm.REG_R1
		p4 := gc.Prog(arm.ABLT)
		p4.To.Type = obj.TYPE_BRANCH
		gc.Patch(p4, p)
	case ssa.OpARMLoweredZeromask:
		// int32(arg0>>1 - arg0) >> 31
		// RSB	r0>>1, r0, r
		// SRA	$31, r, r
		r0 := gc.SSARegNum(v.Args[0])
		r := gc.SSARegNum(v)
		p := gc.Prog(arm.ARSB)
		p.From.Type = obj.TYPE_SHIFT
		p.From.Offset = int64(r0&0xf) | arm.SHIFT_LR | 1<<7 // unsigned r0>>1
		p.Reg = r0
		p.To.Type = obj.TYPE_REG
		p.To.Reg = r
		p = gc.Prog(arm.ASRA)
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = 31
		p.Reg = r
		p.To.Type = obj.TYPE_REG
		p.To.Reg = r
	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.OpARMEqual,
		ssa.OpARMNotEqual,
		ssa.OpARMLessThan,
		ssa.OpARMLessEqual,
		ssa.OpARMGreaterThan,
		ssa.OpARMGreaterEqual,
		ssa.OpARMLessThanU,
		ssa.OpARMLessEqualU,
		ssa.OpARMGreaterThanU,
		ssa.OpARMGreaterEqualU:
		// generate boolean values
		// use conditional move
		p := gc.Prog(arm.AMOVW)
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = 0
		p.To.Type = obj.TYPE_REG
		p.To.Reg = gc.SSARegNum(v)
		p = gc.Prog(arm.AMOVW)
		p.Scond = condBits[v.Op]
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = 1
		p.To.Type = obj.TYPE_REG
		p.To.Reg = gc.SSARegNum(v)
	case ssa.OpARMCarry,
		ssa.OpARMLoweredSelect0,
		ssa.OpARMLoweredSelect1:
		// nothing to do
	case ssa.OpARMLoweredGetClosurePtr:
		// Closure pointer is R7 (arm.REGCTXT).
		gc.CheckLoweredGetClosurePtr(v)
	case ssa.OpARMFlagEQ,
		ssa.OpARMFlagLT_ULT,
		ssa.OpARMFlagLT_UGT,
		ssa.OpARMFlagGT_ULT,
		ssa.OpARMFlagGT_UGT:
		v.Fatalf("Flag* ops should never make it to codegen %v", v.LongString())
	case ssa.OpARMInvertFlags:
		v.Fatalf("InvertFlags should never make it to codegen %v", v.LongString())
	default:
		v.Unimplementedf("genValue not implemented: %s", v.LongString())
	}
}

var condBits = map[ssa.Op]uint8{
	ssa.OpARMEqual:         arm.C_SCOND_EQ,
	ssa.OpARMNotEqual:      arm.C_SCOND_NE,
	ssa.OpARMLessThan:      arm.C_SCOND_LT,
	ssa.OpARMLessThanU:     arm.C_SCOND_LO,
	ssa.OpARMLessEqual:     arm.C_SCOND_LE,
	ssa.OpARMLessEqualU:    arm.C_SCOND_LS,
	ssa.OpARMGreaterThan:   arm.C_SCOND_GT,
	ssa.OpARMGreaterThanU:  arm.C_SCOND_HI,
	ssa.OpARMGreaterEqual:  arm.C_SCOND_GE,
	ssa.OpARMGreaterEqualU: arm.C_SCOND_HS,
}

var blockJump = map[ssa.BlockKind]struct {
	asm, invasm obj.As
}{
	ssa.BlockARMEQ:  {arm.ABEQ, arm.ABNE},
	ssa.BlockARMNE:  {arm.ABNE, arm.ABEQ},
	ssa.BlockARMLT:  {arm.ABLT, arm.ABGE},
	ssa.BlockARMGE:  {arm.ABGE, arm.ABLT},
	ssa.BlockARMLE:  {arm.ABLE, arm.ABGT},
	ssa.BlockARMGT:  {arm.ABGT, arm.ABLE},
	ssa.BlockARMULT: {arm.ABLO, arm.ABHS},
	ssa.BlockARMUGE: {arm.ABHS, arm.ABLO},
	ssa.BlockARMUGT: {arm.ABHI, arm.ABLS},
	ssa.BlockARMULE: {arm.ABLS, arm.ABHI},
}

func ssaGenBlock(s *gc.SSAGenState, b, next *ssa.Block) {
	s.SetLineno(b.Line)

	switch b.Kind {
	case ssa.BlockPlain, ssa.BlockCall, ssa.BlockCheck:
		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.BlockDefer:
		// defer returns in R0:
		// 0 if we should continue executing
		// 1 if we should jump to deferreturn call
		p := gc.Prog(arm.ACMP)
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = 0
		p.Reg = arm.REG_R0
		p = gc.Prog(arm.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.BlockExit:
		gc.Prog(obj.AUNDEF) // tell plive.go that we never reach here

	case ssa.BlockRet:
		gc.Prog(obj.ARET)

	case ssa.BlockRetJmp:
		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))

	case ssa.BlockARMEQ, ssa.BlockARMNE,
		ssa.BlockARMLT, ssa.BlockARMGE,
		ssa.BlockARMLE, ssa.BlockARMGT,
		ssa.BlockARMULT, ssa.BlockARMUGT,
		ssa.BlockARMULE, ssa.BlockARMUGE:
		jmp := blockJump[b.Kind]
		var p *obj.Prog
		switch next {
		case b.Succs[0].Block():
			p = gc.Prog(jmp.invasm)
			p.To.Type = obj.TYPE_BRANCH
			s.Branches = append(s.Branches, gc.Branch{P: p, B: b.Succs[1].Block()})
		case b.Succs[1].Block():
			p = gc.Prog(jmp.asm)
			p.To.Type = obj.TYPE_BRANCH
			s.Branches = append(s.Branches, gc.Branch{P: p, B: b.Succs[0].Block()})
		default:
			p = gc.Prog(jmp.asm)
			p.To.Type = obj.TYPE_BRANCH
			s.Branches = append(s.Branches, gc.Branch{P: p, B: b.Succs[0].Block()})
			q := gc.Prog(obj.AJMP)
			q.To.Type = obj.TYPE_BRANCH
			s.Branches = append(s.Branches, gc.Branch{P: q, B: b.Succs[1].Block()})
		}

	default:
		b.Unimplementedf("branch not implemented: %s. Control: %s", b.LongString(), b.Control.LongString())
	}
}