Golang Flusherrors Examples

Programming Language: Golang

Namespace/Package Name: cmd/internal/gc

Method/Function: Flusherrors

Examples at hotexamples.com: 3

Golang Flusherrors - 3 examples found. These are the top rated real world Golang examples of cmd/internal/gc.Flusherrors extracted from open source projects. You can rate examples to help us improve the quality of examples.

Example #1

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File: gsubr.go Project: klueska/go-akaros

func anyregalloc() bool {
	var j int

	for i := int(0); i < len(reg); i++ {
		if reg[i] == 0 {
			goto ok
		}
		for j = 0; j < len(resvd); j++ {
			if resvd[j] == i {
				goto ok
			}
		}
		return true
	ok:
	}

	return false
}

/*
 * allocate register of type t, leave in n.
 * if o != N, o is desired fixed register.
 * caller must regfree(n).
 */
func regalloc(n *gc.Node, t *gc.Type, o *gc.Node) {
	if t == nil {
		gc.Fatal("regalloc: t nil")
	}
	et := int(int(gc.Simtype[t.Etype]))

	if gc.Debug['r'] != 0 {
		fixfree := int(0)
		fltfree := int(0)
		for i := int(ppc64.REG_R0); i < ppc64.REG_F31; i++ {
			if reg[i-ppc64.REG_R0] == 0 {
				if i < ppc64.REG_F0 {
					fixfree++
				} else {
					fltfree++
				}
			}
		}

		fmt.Printf("regalloc fix %d flt %d free\n", fixfree, fltfree)
	}

	var i int
	switch et {
	case gc.TINT8,
		gc.TUINT8,
		gc.TINT16,
		gc.TUINT16,
		gc.TINT32,
		gc.TUINT32,
		gc.TINT64,
		gc.TUINT64,
		gc.TPTR32,
		gc.TPTR64,
		gc.TBOOL:
		if o != nil && o.Op == gc.OREGISTER {
			i = int(o.Val.U.Reg)
			if i >= ppc64.REGMIN && i <= ppc64.REGMAX {
				goto out
			}
		}

		for i = ppc64.REGMIN; i <= ppc64.REGMAX; i++ {
			if reg[i-ppc64.REG_R0] == 0 {
				regpc[i-ppc64.REG_R0] = uint32(obj.Getcallerpc(&n))
				goto out
			}
		}

		gc.Flusherrors()
		for i := int(ppc64.REG_R0); i < ppc64.REG_R0+ppc64.NREG; i++ {
			fmt.Printf("R%d %p\n", i, regpc[i-ppc64.REG_R0])
		}
		gc.Fatal("out of fixed registers")

	case gc.TFLOAT32,
		gc.TFLOAT64:
		if o != nil && o.Op == gc.OREGISTER {
			i = int(o.Val.U.Reg)
			if i >= ppc64.FREGMIN && i <= ppc64.FREGMAX {
				goto out
			}
		}

		for i = ppc64.FREGMIN; i <= ppc64.FREGMAX; i++ {
			if reg[i-ppc64.REG_R0] == 0 {
				regpc[i-ppc64.REG_R0] = uint32(obj.Getcallerpc(&n))
				goto out
			}
		}

		gc.Flusherrors()
		for i := int(ppc64.REG_F0); i < ppc64.REG_F0+ppc64.NREG; i++ {
			fmt.Printf("F%d %p\n", i, regpc[i-ppc64.REG_R0])
		}
		gc.Fatal("out of floating registers")

	case gc.TCOMPLEX64,
		gc.TCOMPLEX128:
		gc.Tempname(n, t)
		return
	}

	gc.Fatal("regalloc: unknown type %v", gc.Tconv(t, 0))
	return

out:
	reg[i-ppc64.REG_R0]++
	gc.Nodreg(n, t, i)
}

func regfree(n *gc.Node) {
	if n.Op == gc.ONAME {
		return
	}
	if n.Op != gc.OREGISTER && n.Op != gc.OINDREG {
		gc.Fatal("regfree: not a register")
	}
	i := int(int(n.Val.U.Reg) - ppc64.REG_R0)
	if i == ppc64.REGSP-ppc64.REG_R0 {
		return
	}
	if i < 0 || i >= len(reg) {
		gc.Fatal("regfree: reg out of range")
	}
	if reg[i] <= 0 {
		gc.Fatal("regfree: reg not allocated")
	}
	reg[i]--
	if reg[i] == 0 {
		regpc[i] = 0
	}
}

/*
 * generate
 *	as $c, n
 */
func ginscon(as int, c int64, n2 *gc.Node) {
	var n1 gc.Node

	gc.Nodconst(&n1, gc.Types[gc.TINT64], c)

	if as != ppc64.AMOVD && (c < -ppc64.BIG || c > ppc64.BIG) {
		// cannot have more than 16-bit of immediate in ADD, etc.
		// instead, MOV into register first.
		var ntmp gc.Node
		regalloc(&ntmp, gc.Types[gc.TINT64], nil)

		gins(ppc64.AMOVD, &n1, &ntmp)
		gins(as, &ntmp, n2)
		regfree(&ntmp)
		return
	}

	gins(as, &n1, n2)
}

/*
 * generate
 *	as n, $c (CMP/CMPU)
 */
func ginscon2(as int, n2 *gc.Node, c int64) {
	var n1 gc.Node

	gc.Nodconst(&n1, gc.Types[gc.TINT64], c)

	switch as {
	default:
		gc.Fatal("ginscon2")

	case ppc64.ACMP:
		if -ppc64.BIG <= c && c <= ppc64.BIG {
			gins(as, n2, &n1)
			return
		}

	case ppc64.ACMPU:
		if 0 <= c && c <= 2*ppc64.BIG {
			gins(as, n2, &n1)
			return
		}
	}

	// MOV n1 into register first
	var ntmp gc.Node
	regalloc(&ntmp, gc.Types[gc.TINT64], nil)

	gins(ppc64.AMOVD, &n1, &ntmp)
	gins(as, n2, &ntmp)
	regfree(&ntmp)
}

/*
 * set up nodes representing 2^63
 */
var bigi gc.Node

var bigf gc.Node

var bignodes_did int

func bignodes() {
	if bignodes_did != 0 {
		return
	}
	bignodes_did = 1

	gc.Nodconst(&bigi, gc.Types[gc.TUINT64], 1)
	gc.Mpshiftfix(bigi.Val.U.Xval, 63)

	bigf = bigi
	bigf.Type = gc.Types[gc.TFLOAT64]
	bigf.Val.Ctype = gc.CTFLT
	bigf.Val.U.Fval = new(gc.Mpflt)
	gc.Mpmovefixflt(bigf.Val.U.Fval, bigi.Val.U.Xval)
}

/*
 * generate move:
 *	t = f
 * hard part is conversions.
 */
func gmove(f *gc.Node, t *gc.Node) {
	if gc.Debug['M'] != 0 {
		fmt.Printf("gmove %v -> %v\n", gc.Nconv(f, obj.FmtLong), gc.Nconv(t, obj.FmtLong))
	}

	ft := int(gc.Simsimtype(f.Type))
	tt := int(gc.Simsimtype(t.Type))
	cvt := (*gc.Type)(t.Type)

	if gc.Iscomplex[ft] || gc.Iscomplex[tt] {
		gc.Complexmove(f, t)
		return
	}

	// cannot have two memory operands
	var r2 gc.Node
	var r1 gc.Node
	var a int
	if gc.Ismem(f) && gc.Ismem(t) {
		goto hard
	}

	// convert constant to desired type
	if f.Op == gc.OLITERAL {
		var con gc.Node
		switch tt {
		default:
			gc.Convconst(&con, t.Type, &f.Val)

		case gc.TINT32,
			gc.TINT16,
			gc.TINT8:
			var con gc.Node
			gc.Convconst(&con, gc.Types[gc.TINT64], &f.Val)
			var r1 gc.Node
			regalloc(&r1, con.Type, t)
			gins(ppc64.AMOVD, &con, &r1)
			gmove(&r1, t)
			regfree(&r1)
			return

		case gc.TUINT32,
			gc.TUINT16,
			gc.TUINT8:
			var con gc.Node
			gc.Convconst(&con, gc.Types[gc.TUINT64], &f.Val)
			var r1 gc.Node
			regalloc(&r1, con.Type, t)
			gins(ppc64.AMOVD, &con, &r1)
			gmove(&r1, t)
			regfree(&r1)
			return
		}

		f = &con
		ft = tt // so big switch will choose a simple mov

		// constants can't move directly to memory.
		if gc.Ismem(t) {
			goto hard
		}
	}

	// float constants come from memory.
	//if(isfloat[tt])
	//	goto hard;

	// 64-bit immediates are also from memory.
	//if(isint[tt])
	//	goto hard;
	//// 64-bit immediates are really 32-bit sign-extended
	//// unless moving into a register.
	//if(isint[tt]) {
	//	if(mpcmpfixfix(con.val.u.xval, minintval[TINT32]) < 0)
	//		goto hard;
	//	if(mpcmpfixfix(con.val.u.xval, maxintval[TINT32]) > 0)
	//		goto hard;
	//}

	// value -> value copy, only one memory operand.
	// figure out the instruction to use.
	// break out of switch for one-instruction gins.
	// goto rdst for "destination must be register".
	// goto hard for "convert to cvt type first".
	// otherwise handle and return.

	switch uint32(ft)<<16 | uint32(tt) {
	default:
		gc.Fatal("gmove %v -> %v", gc.Tconv(f.Type, obj.FmtLong), gc.Tconv(t.Type, obj.FmtLong))

		/*
		 * integer copy and truncate
		 */
	case gc.TINT8<<16 | gc.TINT8, // same size
		gc.TUINT8<<16 | gc.TINT8,
		gc.TINT16<<16 | gc.TINT8,
		// truncate
		gc.TUINT16<<16 | gc.TINT8,
		gc.TINT32<<16 | gc.TINT8,
		gc.TUINT32<<16 | gc.TINT8,
		gc.TINT64<<16 | gc.TINT8,
		gc.TUINT64<<16 | gc.TINT8:
		a = ppc64.AMOVB

	case gc.TINT8<<16 | gc.TUINT8, // same size
		gc.TUINT8<<16 | gc.TUINT8,
		gc.TINT16<<16 | gc.TUINT8,
		// truncate
		gc.TUINT16<<16 | gc.TUINT8,
		gc.TINT32<<16 | gc.TUINT8,
		gc.TUINT32<<16 | gc.TUINT8,
		gc.TINT64<<16 | gc.TUINT8,
		gc.TUINT64<<16 | gc.TUINT8:
		a = ppc64.AMOVBZ

	case gc.TINT16<<16 | gc.TINT16, // same size
		gc.TUINT16<<16 | gc.TINT16,
		gc.TINT32<<16 | gc.TINT16,
		// truncate
		gc.TUINT32<<16 | gc.TINT16,
		gc.TINT64<<16 | gc.TINT16,
		gc.TUINT64<<16 | gc.TINT16:
		a = ppc64.AMOVH

	case gc.TINT16<<16 | gc.TUINT16, // same size
		gc.TUINT16<<16 | gc.TUINT16,
		gc.TINT32<<16 | gc.TUINT16,
		// truncate
		gc.TUINT32<<16 | gc.TUINT16,
		gc.TINT64<<16 | gc.TUINT16,
		gc.TUINT64<<16 | gc.TUINT16:
		a = ppc64.AMOVHZ

	case gc.TINT32<<16 | gc.TINT32, // same size
		gc.TUINT32<<16 | gc.TINT32,
		gc.TINT64<<16 | gc.TINT32,
		// truncate
		gc.TUINT64<<16 | gc.TINT32:
		a = ppc64.AMOVW

	case gc.TINT32<<16 | gc.TUINT32, // same size
		gc.TUINT32<<16 | gc.TUINT32,
		gc.TINT64<<16 | gc.TUINT32,
		gc.TUINT64<<16 | gc.TUINT32:
		a = ppc64.AMOVWZ

	case gc.TINT64<<16 | gc.TINT64, // same size
		gc.TINT64<<16 | gc.TUINT64,
		gc.TUINT64<<16 | gc.TINT64,
		gc.TUINT64<<16 | gc.TUINT64:
		a = ppc64.AMOVD

		/*
		 * integer up-conversions
		 */
	case gc.TINT8<<16 | gc.TINT16, // sign extend int8
		gc.TINT8<<16 | gc.TUINT16,
		gc.TINT8<<16 | gc.TINT32,
		gc.TINT8<<16 | gc.TUINT32,
		gc.TINT8<<16 | gc.TINT64,
		gc.TINT8<<16 | gc.TUINT64:
		a = ppc64.AMOVB

		goto rdst

	case gc.TUINT8<<16 | gc.TINT16, // zero extend uint8
		gc.TUINT8<<16 | gc.TUINT16,
		gc.TUINT8<<16 | gc.TINT32,
		gc.TUINT8<<16 | gc.TUINT32,
		gc.TUINT8<<16 | gc.TINT64,
		gc.TUINT8<<16 | gc.TUINT64:
		a = ppc64.AMOVBZ

		goto rdst

	case gc.TINT16<<16 | gc.TINT32, // sign extend int16
		gc.TINT16<<16 | gc.TUINT32,
		gc.TINT16<<16 | gc.TINT64,
		gc.TINT16<<16 | gc.TUINT64:
		a = ppc64.AMOVH

		goto rdst

	case gc.TUINT16<<16 | gc.TINT32, // zero extend uint16
		gc.TUINT16<<16 | gc.TUINT32,
		gc.TUINT16<<16 | gc.TINT64,
		gc.TUINT16<<16 | gc.TUINT64:
		a = ppc64.AMOVHZ

		goto rdst

	case gc.TINT32<<16 | gc.TINT64, // sign extend int32
		gc.TINT32<<16 | gc.TUINT64:
		a = ppc64.AMOVW

		goto rdst

	case gc.TUINT32<<16 | gc.TINT64, // zero extend uint32
		gc.TUINT32<<16 | gc.TUINT64:
		a = ppc64.AMOVWZ

		goto rdst

		//warn("gmove: convert float to int not implemented: %N -> %N\n", f, t);
	//return;
	// algorithm is:
	//	if small enough, use native float64 -> int64 conversion.
	//	otherwise, subtract 2^63, convert, and add it back.
	/*
	* float to integer
	 */
	case gc.TFLOAT32<<16 | gc.TINT32,
		gc.TFLOAT64<<16 | gc.TINT32,
		gc.TFLOAT32<<16 | gc.TINT64,
		gc.TFLOAT64<<16 | gc.TINT64,
		gc.TFLOAT32<<16 | gc.TINT16,
		gc.TFLOAT32<<16 | gc.TINT8,
		gc.TFLOAT32<<16 | gc.TUINT16,
		gc.TFLOAT32<<16 | gc.TUINT8,
		gc.TFLOAT64<<16 | gc.TINT16,
		gc.TFLOAT64<<16 | gc.TINT8,
		gc.TFLOAT64<<16 | gc.TUINT16,
		gc.TFLOAT64<<16 | gc.TUINT8,
		gc.TFLOAT32<<16 | gc.TUINT32,
		gc.TFLOAT64<<16 | gc.TUINT32,
		gc.TFLOAT32<<16 | gc.TUINT64,
		gc.TFLOAT64<<16 | gc.TUINT64:
		bignodes()

		var r1 gc.Node
		regalloc(&r1, gc.Types[ft], f)
		gmove(f, &r1)
		if tt == gc.TUINT64 {
			regalloc(&r2, gc.Types[gc.TFLOAT64], nil)
			gmove(&bigf, &r2)
			gins(ppc64.AFCMPU, &r1, &r2)
			p1 := (*obj.Prog)(gc.Gbranch(optoas(gc.OLT, gc.Types[gc.TFLOAT64]), nil, +1))
			gins(ppc64.AFSUB, &r2, &r1)
			gc.Patch(p1, gc.Pc)
			regfree(&r2)
		}

		regalloc(&r2, gc.Types[gc.TFLOAT64], nil)
		var r3 gc.Node
		regalloc(&r3, gc.Types[gc.TINT64], t)
		gins(ppc64.AFCTIDZ, &r1, &r2)
		p1 := (*obj.Prog)(gins(ppc64.AFMOVD, &r2, nil))
		p1.To.Type = obj.TYPE_MEM
		p1.To.Reg = ppc64.REGSP
		p1.To.Offset = -8
		p1 = gins(ppc64.AMOVD, nil, &r3)
		p1.From.Type = obj.TYPE_MEM
		p1.From.Reg = ppc64.REGSP
		p1.From.Offset = -8
		regfree(&r2)
		regfree(&r1)
		if tt == gc.TUINT64 {
			p1 := (*obj.Prog)(gc.Gbranch(optoas(gc.OLT, gc.Types[gc.TFLOAT64]), nil, +1)) // use CR0 here again
			gc.Nodreg(&r1, gc.Types[gc.TINT64], ppc64.REGTMP)
			gins(ppc64.AMOVD, &bigi, &r1)
			gins(ppc64.AADD, &r1, &r3)
			gc.Patch(p1, gc.Pc)
		}

		gmove(&r3, t)
		regfree(&r3)
		return

		//warn("gmove: convert int to float not implemented: %N -> %N\n", f, t);
	//return;
	// algorithm is:
	//	if small enough, use native int64 -> uint64 conversion.
	//	otherwise, halve (rounding to odd?), convert, and double.
	/*
	 * integer to float
	 */
	case gc.TINT32<<16 | gc.TFLOAT32,
		gc.TINT32<<16 | gc.TFLOAT64,
		gc.TINT64<<16 | gc.TFLOAT32,
		gc.TINT64<<16 | gc.TFLOAT64,
		gc.TINT16<<16 | gc.TFLOAT32,
		gc.TINT16<<16 | gc.TFLOAT64,
		gc.TINT8<<16 | gc.TFLOAT32,
		gc.TINT8<<16 | gc.TFLOAT64,
		gc.TUINT16<<16 | gc.TFLOAT32,
		gc.TUINT16<<16 | gc.TFLOAT64,
		gc.TUINT8<<16 | gc.TFLOAT32,
		gc.TUINT8<<16 | gc.TFLOAT64,
		gc.TUINT32<<16 | gc.TFLOAT32,
		gc.TUINT32<<16 | gc.TFLOAT64,
		gc.TUINT64<<16 | gc.TFLOAT32,
		gc.TUINT64<<16 | gc.TFLOAT64:
		bignodes()

		var r1 gc.Node
		regalloc(&r1, gc.Types[gc.TINT64], nil)
		gmove(f, &r1)
		if ft == gc.TUINT64 {
			gc.Nodreg(&r2, gc.Types[gc.TUINT64], ppc64.REGTMP)
			gmove(&bigi, &r2)
			gins(ppc64.ACMPU, &r1, &r2)
			p1 := (*obj.Prog)(gc.Gbranch(optoas(gc.OLT, gc.Types[gc.TUINT64]), nil, +1))
			p2 := (*obj.Prog)(gins(ppc64.ASRD, nil, &r1))
			p2.From.Type = obj.TYPE_CONST
			p2.From.Offset = 1
			gc.Patch(p1, gc.Pc)
		}

		regalloc(&r2, gc.Types[gc.TFLOAT64], t)
		p1 := (*obj.Prog)(gins(ppc64.AMOVD, &r1, nil))
		p1.To.Type = obj.TYPE_MEM
		p1.To.Reg = ppc64.REGSP
		p1.To.Offset = -8
		p1 = gins(ppc64.AFMOVD, nil, &r2)
		p1.From.Type = obj.TYPE_MEM
		p1.From.Reg = ppc64.REGSP
		p1.From.Offset = -8
		gins(ppc64.AFCFID, &r2, &r2)
		regfree(&r1)
		if ft == gc.TUINT64 {
			p1 := (*obj.Prog)(gc.Gbranch(optoas(gc.OLT, gc.Types[gc.TUINT64]), nil, +1)) // use CR0 here again
			gc.Nodreg(&r1, gc.Types[gc.TFLOAT64], ppc64.FREGTWO)
			gins(ppc64.AFMUL, &r1, &r2)
			gc.Patch(p1, gc.Pc)
		}

		gmove(&r2, t)
		regfree(&r2)
		return

		/*
		 * float to float
		 */
	case gc.TFLOAT32<<16 | gc.TFLOAT32:
		a = ppc64.AFMOVS

	case gc.TFLOAT64<<16 | gc.TFLOAT64:
		a = ppc64.AFMOVD

	case gc.TFLOAT32<<16 | gc.TFLOAT64:
		a = ppc64.AFMOVS
		goto rdst

	case gc.TFLOAT64<<16 | gc.TFLOAT32:
		a = ppc64.AFRSP
		goto rdst
	}

	gins(a, f, t)
	return

	// requires register destination
rdst:
	{
		regalloc(&r1, t.Type, t)

		gins(a, f, &r1)
		gmove(&r1, t)
		regfree(&r1)
		return
	}

	// requires register intermediate
hard:
	regalloc(&r1, cvt, t)

	gmove(f, &r1)
	gmove(&r1, t)
	regfree(&r1)
	return
}

/*
 * generate one instruction:
 *	as f, t
 */
func gins(as int, f *gc.Node, t *gc.Node) *obj.Prog {
	// TODO(austin): Add self-move test like in 6g (but be careful
	// of truncation moves)

	af := obj.Addr(obj.Addr{})

	at := obj.Addr(obj.Addr{})
	if f != nil {
		af = gc.Naddr(f)
	}
	if t != nil {
		at = gc.Naddr(t)
	}
	p := (*obj.Prog)(gc.Prog(as))
	if f != nil {
		p.From = af
	}
	if t != nil {
		p.To = at
	}
	if gc.Debug['g'] != 0 {
		fmt.Printf("%v\n", p)
	}

	w := int32(0)
	switch as {
	case ppc64.AMOVB,
		ppc64.AMOVBU,
		ppc64.AMOVBZ,
		ppc64.AMOVBZU:
		w = 1

	case ppc64.AMOVH,
		ppc64.AMOVHU,
		ppc64.AMOVHZ,
		ppc64.AMOVHZU:
		w = 2

	case ppc64.AMOVW,
		ppc64.AMOVWU,
		ppc64.AMOVWZ,
		ppc64.AMOVWZU:
		w = 4

	case ppc64.AMOVD,
		ppc64.AMOVDU:
		if af.Type == obj.TYPE_CONST || af.Type == obj.TYPE_ADDR {
			break
		}
		w = 8
	}

	if w != 0 && ((f != nil && af.Width < int64(w)) || (t != nil && at.Type != obj.TYPE_REG && at.Width > int64(w))) {
		gc.Dump("f", f)
		gc.Dump("t", t)
		gc.Fatal("bad width: %v (%d, %d)\n", p, af.Width, at.Width)
	}

	return p
}

func fixlargeoffset(n *gc.Node) {
	if n == nil {
		return
	}
	if n.Op != gc.OINDREG {
		return
	}
	if n.Val.U.Reg == ppc64.REGSP { // stack offset cannot be large
		return
	}
	if n.Xoffset != int64(int32(n.Xoffset)) {
		// TODO(minux): offset too large, move into R31 and add to R31 instead.
		// this is used only in test/fixedbugs/issue6036.go.
		gc.Fatal("offset too large: %v", gc.Nconv(n, 0))

		a := gc.Node(*n)
		a.Op = gc.OREGISTER
		a.Type = gc.Types[gc.Tptr]
		a.Xoffset = 0
		gc.Cgen_checknil(&a)
		ginscon(optoas(gc.OADD, gc.Types[gc.Tptr]), n.Xoffset, &a)
		n.Xoffset = 0
	}
}

/*
 * return Axxx for Oxxx on type t.
 */
func optoas(op int, t *gc.Type) int {
	if t == nil {
		gc.Fatal("optoas: t is nil")
	}

	a := int(obj.AXXX)
	switch uint32(op)<<16 | uint32(gc.Simtype[t.Etype]) {
	default:
		gc.Fatal("optoas: no entry for op=%v type=%v", gc.Oconv(int(op), 0), gc.Tconv(t, 0))

	case gc.OEQ<<16 | gc.TBOOL,
		gc.OEQ<<16 | gc.TINT8,
		gc.OEQ<<16 | gc.TUINT8,
		gc.OEQ<<16 | gc.TINT16,
		gc.OEQ<<16 | gc.TUINT16,
		gc.OEQ<<16 | gc.TINT32,
		gc.OEQ<<16 | gc.TUINT32,
		gc.OEQ<<16 | gc.TINT64,
		gc.OEQ<<16 | gc.TUINT64,
		gc.OEQ<<16 | gc.TPTR32,
		gc.OEQ<<16 | gc.TPTR64,
		gc.OEQ<<16 | gc.TFLOAT32,
		gc.OEQ<<16 | gc.TFLOAT64:
		a = ppc64.ABEQ

	case gc.ONE<<16 | gc.TBOOL,
		gc.ONE<<16 | gc.TINT8,
		gc.ONE<<16 | gc.TUINT8,
		gc.ONE<<16 | gc.TINT16,
		gc.ONE<<16 | gc.TUINT16,
		gc.ONE<<16 | gc.TINT32,
		gc.ONE<<16 | gc.TUINT32,
		gc.ONE<<16 | gc.TINT64,
		gc.ONE<<16 | gc.TUINT64,
		gc.ONE<<16 | gc.TPTR32,
		gc.ONE<<16 | gc.TPTR64,
		gc.ONE<<16 | gc.TFLOAT32,
		gc.ONE<<16 | gc.TFLOAT64:
		a = ppc64.ABNE

	case gc.OLT<<16 | gc.TINT8, // ACMP
		gc.OLT<<16 | gc.TINT16,
		gc.OLT<<16 | gc.TINT32,
		gc.OLT<<16 | gc.TINT64,
		gc.OLT<<16 | gc.TUINT8,
		// ACMPU
		gc.OLT<<16 | gc.TUINT16,
		gc.OLT<<16 | gc.TUINT32,
		gc.OLT<<16 | gc.TUINT64,
		gc.OLT<<16 | gc.TFLOAT32,
		// AFCMPU
		gc.OLT<<16 | gc.TFLOAT64:
		a = ppc64.ABLT

	case gc.OLE<<16 | gc.TINT8, // ACMP
		gc.OLE<<16 | gc.TINT16,
		gc.OLE<<16 | gc.TINT32,
		gc.OLE<<16 | gc.TINT64,
		gc.OLE<<16 | gc.TUINT8,
		// ACMPU
		gc.OLE<<16 | gc.TUINT16,
		gc.OLE<<16 | gc.TUINT32,
		gc.OLE<<16 | gc.TUINT64,
		gc.OLE<<16 | gc.TFLOAT32,
		// AFCMPU
		gc.OLE<<16 | gc.TFLOAT64:
		a = ppc64.ABLE

	case gc.OGT<<16 | gc.TINT8,
		gc.OGT<<16 | gc.TINT16,
		gc.OGT<<16 | gc.TINT32,
		gc.OGT<<16 | gc.TINT64,
		gc.OGT<<16 | gc.TUINT8,
		gc.OGT<<16 | gc.TUINT16,
		gc.OGT<<16 | gc.TUINT32,
		gc.OGT<<16 | gc.TUINT64,
		gc.OGT<<16 | gc.TFLOAT32,
		gc.OGT<<16 | gc.TFLOAT64:
		a = ppc64.ABGT

	case gc.OGE<<16 | gc.TINT8,
		gc.OGE<<16 | gc.TINT16,
		gc.OGE<<16 | gc.TINT32,
		gc.OGE<<16 | gc.TINT64,
		gc.OGE<<16 | gc.TUINT8,
		gc.OGE<<16 | gc.TUINT16,
		gc.OGE<<16 | gc.TUINT32,
		gc.OGE<<16 | gc.TUINT64,
		gc.OGE<<16 | gc.TFLOAT32,
		gc.OGE<<16 | gc.TFLOAT64:
		a = ppc64.ABGE

	case gc.OCMP<<16 | gc.TBOOL,
		gc.OCMP<<16 | gc.TINT8,
		gc.OCMP<<16 | gc.TINT16,
		gc.OCMP<<16 | gc.TINT32,
		gc.OCMP<<16 | gc.TPTR32,
		gc.OCMP<<16 | gc.TINT64:
		a = ppc64.ACMP

	case gc.OCMP<<16 | gc.TUINT8,
		gc.OCMP<<16 | gc.TUINT16,
		gc.OCMP<<16 | gc.TUINT32,
		gc.OCMP<<16 | gc.TUINT64,
		gc.OCMP<<16 | gc.TPTR64:
		a = ppc64.ACMPU

	case gc.OCMP<<16 | gc.TFLOAT32,
		gc.OCMP<<16 | gc.TFLOAT64:
		a = ppc64.AFCMPU

	case gc.OAS<<16 | gc.TBOOL,
		gc.OAS<<16 | gc.TINT8:
		a = ppc64.AMOVB

	case gc.OAS<<16 | gc.TUINT8:
		a = ppc64.AMOVBZ

	case gc.OAS<<16 | gc.TINT16:
		a = ppc64.AMOVH

	case gc.OAS<<16 | gc.TUINT16:
		a = ppc64.AMOVHZ

	case gc.OAS<<16 | gc.TINT32:
		a = ppc64.AMOVW

	case gc.OAS<<16 | gc.TUINT32,
		gc.OAS<<16 | gc.TPTR32:
		a = ppc64.AMOVWZ

	case gc.OAS<<16 | gc.TINT64,
		gc.OAS<<16 | gc.TUINT64,
		gc.OAS<<16 | gc.TPTR64:
		a = ppc64.AMOVD

	case gc.OAS<<16 | gc.TFLOAT32:
		a = ppc64.AFMOVS

	case gc.OAS<<16 | gc.TFLOAT64:
		a = ppc64.AFMOVD

	case gc.OADD<<16 | gc.TINT8,
		gc.OADD<<16 | gc.TUINT8,
		gc.OADD<<16 | gc.TINT16,
		gc.OADD<<16 | gc.TUINT16,
		gc.OADD<<16 | gc.TINT32,
		gc.OADD<<16 | gc.TUINT32,
		gc.OADD<<16 | gc.TPTR32,
		gc.OADD<<16 | gc.TINT64,
		gc.OADD<<16 | gc.TUINT64,
		gc.OADD<<16 | gc.TPTR64:
		a = ppc64.AADD

	case gc.OADD<<16 | gc.TFLOAT32:
		a = ppc64.AFADDS

	case gc.OADD<<16 | gc.TFLOAT64:
		a = ppc64.AFADD

	case gc.OSUB<<16 | gc.TINT8,
		gc.OSUB<<16 | gc.TUINT8,
		gc.OSUB<<16 | gc.TINT16,
		gc.OSUB<<16 | gc.TUINT16,
		gc.OSUB<<16 | gc.TINT32,
		gc.OSUB<<16 | gc.TUINT32,
		gc.OSUB<<16 | gc.TPTR32,
		gc.OSUB<<16 | gc.TINT64,
		gc.OSUB<<16 | gc.TUINT64,
		gc.OSUB<<16 | gc.TPTR64:
		a = ppc64.ASUB

	case gc.OSUB<<16 | gc.TFLOAT32:
		a = ppc64.AFSUBS

	case gc.OSUB<<16 | gc.TFLOAT64:
		a = ppc64.AFSUB

	case gc.OMINUS<<16 | gc.TINT8,
		gc.OMINUS<<16 | gc.TUINT8,
		gc.OMINUS<<16 | gc.TINT16,
		gc.OMINUS<<16 | gc.TUINT16,
		gc.OMINUS<<16 | gc.TINT32,
		gc.OMINUS<<16 | gc.TUINT32,
		gc.OMINUS<<16 | gc.TPTR32,
		gc.OMINUS<<16 | gc.TINT64,
		gc.OMINUS<<16 | gc.TUINT64,
		gc.OMINUS<<16 | gc.TPTR64:
		a = ppc64.ANEG

	case gc.OAND<<16 | gc.TINT8,
		gc.OAND<<16 | gc.TUINT8,
		gc.OAND<<16 | gc.TINT16,
		gc.OAND<<16 | gc.TUINT16,
		gc.OAND<<16 | gc.TINT32,
		gc.OAND<<16 | gc.TUINT32,
		gc.OAND<<16 | gc.TPTR32,
		gc.OAND<<16 | gc.TINT64,
		gc.OAND<<16 | gc.TUINT64,
		gc.OAND<<16 | gc.TPTR64:
		a = ppc64.AAND

	case gc.OOR<<16 | gc.TINT8,
		gc.OOR<<16 | gc.TUINT8,
		gc.OOR<<16 | gc.TINT16,
		gc.OOR<<16 | gc.TUINT16,
		gc.OOR<<16 | gc.TINT32,
		gc.OOR<<16 | gc.TUINT32,
		gc.OOR<<16 | gc.TPTR32,
		gc.OOR<<16 | gc.TINT64,
		gc.OOR<<16 | gc.TUINT64,
		gc.OOR<<16 | gc.TPTR64:
		a = ppc64.AOR

	case gc.OXOR<<16 | gc.TINT8,
		gc.OXOR<<16 | gc.TUINT8,
		gc.OXOR<<16 | gc.TINT16,
		gc.OXOR<<16 | gc.TUINT16,
		gc.OXOR<<16 | gc.TINT32,
		gc.OXOR<<16 | gc.TUINT32,
		gc.OXOR<<16 | gc.TPTR32,
		gc.OXOR<<16 | gc.TINT64,
		gc.OXOR<<16 | gc.TUINT64,
		gc.OXOR<<16 | gc.TPTR64:
		a = ppc64.AXOR

		// TODO(minux): handle rotates
	//case CASE(OLROT, TINT8):
	//case CASE(OLROT, TUINT8):
	//case CASE(OLROT, TINT16):
	//case CASE(OLROT, TUINT16):
	//case CASE(OLROT, TINT32):
	//case CASE(OLROT, TUINT32):
	//case CASE(OLROT, TPTR32):
	//case CASE(OLROT, TINT64):
	//case CASE(OLROT, TUINT64):
	//case CASE(OLROT, TPTR64):
	//	a = 0//???; RLDC?
	//	break;

	case gc.OLSH<<16 | gc.TINT8,
		gc.OLSH<<16 | gc.TUINT8,
		gc.OLSH<<16 | gc.TINT16,
		gc.OLSH<<16 | gc.TUINT16,
		gc.OLSH<<16 | gc.TINT32,
		gc.OLSH<<16 | gc.TUINT32,
		gc.OLSH<<16 | gc.TPTR32,
		gc.OLSH<<16 | gc.TINT64,
		gc.OLSH<<16 | gc.TUINT64,
		gc.OLSH<<16 | gc.TPTR64:
		a = ppc64.ASLD

	case gc.ORSH<<16 | gc.TUINT8,
		gc.ORSH<<16 | gc.TUINT16,
		gc.ORSH<<16 | gc.TUINT32,
		gc.ORSH<<16 | gc.TPTR32,
		gc.ORSH<<16 | gc.TUINT64,
		gc.ORSH<<16 | gc.TPTR64:
		a = ppc64.ASRD

	case gc.ORSH<<16 | gc.TINT8,
		gc.ORSH<<16 | gc.TINT16,
		gc.ORSH<<16 | gc.TINT32,
		gc.ORSH<<16 | gc.TINT64:
		a = ppc64.ASRAD

		// TODO(minux): handle rotates
	//case CASE(ORROTC, TINT8):
	//case CASE(ORROTC, TUINT8):
	//case CASE(ORROTC, TINT16):
	//case CASE(ORROTC, TUINT16):
	//case CASE(ORROTC, TINT32):
	//case CASE(ORROTC, TUINT32):
	//case CASE(ORROTC, TINT64):
	//case CASE(ORROTC, TUINT64):
	//	a = 0//??? RLDC??
	//	break;

	case gc.OHMUL<<16 | gc.TINT64:
		a = ppc64.AMULHD

	case gc.OHMUL<<16 | gc.TUINT64,
		gc.OHMUL<<16 | gc.TPTR64:
		a = ppc64.AMULHDU

	case gc.OMUL<<16 | gc.TINT8,
		gc.OMUL<<16 | gc.TINT16,
		gc.OMUL<<16 | gc.TINT32,
		gc.OMUL<<16 | gc.TINT64:
		a = ppc64.AMULLD

	case gc.OMUL<<16 | gc.TUINT8,
		gc.OMUL<<16 | gc.TUINT16,
		gc.OMUL<<16 | gc.TUINT32,
		gc.OMUL<<16 | gc.TPTR32,
		// don't use word multiply, the high 32-bit are undefined.
		// fallthrough
		gc.OMUL<<16 | gc.TUINT64,
		gc.OMUL<<16 | gc.TPTR64:
		a = ppc64.AMULLD
		// for 64-bit multiplies, signedness doesn't matter.

	case gc.OMUL<<16 | gc.TFLOAT32:
		a = ppc64.AFMULS

	case gc.OMUL<<16 | gc.TFLOAT64:
		a = ppc64.AFMUL

	case gc.ODIV<<16 | gc.TINT8,
		gc.ODIV<<16 | gc.TINT16,
		gc.ODIV<<16 | gc.TINT32,
		gc.ODIV<<16 | gc.TINT64:
		a = ppc64.ADIVD

	case gc.ODIV<<16 | gc.TUINT8,
		gc.ODIV<<16 | gc.TUINT16,
		gc.ODIV<<16 | gc.TUINT32,
		gc.ODIV<<16 | gc.TPTR32,
		gc.ODIV<<16 | gc.TUINT64,
		gc.ODIV<<16 | gc.TPTR64:
		a = ppc64.ADIVDU

	case gc.ODIV<<16 | gc.TFLOAT32:
		a = ppc64.AFDIVS

	case gc.ODIV<<16 | gc.TFLOAT64:
		a = ppc64.AFDIV
	}

	return a
}

const (
	ODynam   = 1 << 0
	OAddable = 1 << 1
)

func xgen(n *gc.Node, a *gc.Node, o int) bool {
	// TODO(minux)

	return -1 != 0 /*TypeKind(100016)*/
}

func sudoclean() {
	return
}

/*
 * generate code to compute address of n,
 * a reference to a (perhaps nested) field inside
 * an array or struct.
 * return 0 on failure, 1 on success.
 * on success, leaves usable address in a.
 *
 * caller is responsible for calling sudoclean
 * after successful sudoaddable,
 * to release the register used for a.
 */
func sudoaddable(as int, n *gc.Node, a *obj.Addr) bool {
	// TODO(minux)

	*a = obj.Addr{}
	return false
}

Example #2

Show file

File: gsubr.go Project: klueska/go-akaros

func anyregalloc() bool {
	var j int

	for i := int(0); i < len(reg); i++ {
		if reg[i] == 0 {
			goto ok
		}
		for j = 0; j < len(resvd); j++ {
			if resvd[j] == i {
				goto ok
			}
		}
		return true
	ok:
	}

	return false
}

/*
 * allocate register of type t, leave in n.
 * if o != N, o is desired fixed register.
 * caller must regfree(n).
 */
func regalloc(n *gc.Node, t *gc.Type, o *gc.Node) {
	if t == nil {
		gc.Fatal("regalloc: t nil")
	}
	et := int(int(gc.Simtype[t.Etype]))

	if gc.Debug['r'] != 0 {
		fixfree := int(0)
		fltfree := int(0)
		for i := int(arm64.REG_R0); i < arm64.REG_F31; i++ {
			if reg[i-arm64.REG_R0] == 0 {
				if i < arm64.REG_F0 {
					fixfree++
				} else {
					fltfree++
				}
			}
		}

		fmt.Printf("regalloc fix %d flt %d free\n", fixfree, fltfree)
	}

	var i int
	switch et {
	case gc.TINT8,
		gc.TUINT8,
		gc.TINT16,
		gc.TUINT16,
		gc.TINT32,
		gc.TUINT32,
		gc.TINT64,
		gc.TUINT64,
		gc.TPTR32,
		gc.TPTR64,
		gc.TBOOL:
		if o != nil && o.Op == gc.OREGISTER {
			i = int(o.Val.U.Reg)
			if i >= arm64.REGMIN && i <= arm64.REGMAX {
				goto out
			}
		}

		for i = arm64.REGMIN; i <= arm64.REGMAX; i++ {
			if reg[i-arm64.REG_R0] == 0 {
				regpc[i-arm64.REG_R0] = uint32(obj.Getcallerpc(&n))
				goto out
			}
		}

		gc.Flusherrors()
		for i := int(arm64.REG_R0); i < arm64.REG_R0+arm64.NREG; i++ {
			fmt.Printf("R%d %p\n", i, regpc[i-arm64.REG_R0])
		}
		gc.Fatal("out of fixed registers")

	case gc.TFLOAT32,
		gc.TFLOAT64:
		if o != nil && o.Op == gc.OREGISTER {
			i = int(o.Val.U.Reg)
			if i >= arm64.FREGMIN && i <= arm64.FREGMAX {
				goto out
			}
		}

		for i = arm64.FREGMIN; i <= arm64.FREGMAX; i++ {
			if reg[i-arm64.REG_R0] == 0 {
				regpc[i-arm64.REG_R0] = uint32(obj.Getcallerpc(&n))
				goto out
			}
		}

		gc.Flusherrors()
		for i := int(arm64.REG_F0); i < arm64.REG_F0+arm64.NREG; i++ {
			fmt.Printf("F%d %p\n", i, regpc[i-arm64.REG_R0])
		}
		gc.Fatal("out of floating registers")

	case gc.TCOMPLEX64,
		gc.TCOMPLEX128:
		gc.Tempname(n, t)
		return
	}

	gc.Fatal("regalloc: unknown type %v", gc.Tconv(t, 0))
	return

out:
	reg[i-arm64.REG_R0]++
	gc.Nodreg(n, t, i)
}

func regfree(n *gc.Node) {
	if n.Op == gc.ONAME {
		return
	}
	if n.Op != gc.OREGISTER && n.Op != gc.OINDREG {
		gc.Fatal("regfree: not a register")
	}
	i := int(int(n.Val.U.Reg) - arm64.REG_R0)
	if i == arm64.REGSP-arm64.REG_R0 {
		return
	}
	if i < 0 || i >= len(reg) {
		gc.Fatal("regfree: reg out of range")
	}
	if reg[i] <= 0 {
		gc.Fatal("regfree: reg not allocated")
	}
	reg[i]--
	if reg[i] == 0 {
		regpc[i] = 0
	}
}

/*
 * generate
 *	as $c, n
 */
func ginscon(as int, c int64, n2 *gc.Node) {
	var n1 gc.Node

	gc.Nodconst(&n1, gc.Types[gc.TINT64], c)

	if as != arm64.AMOVD && (c < -arm64.BIG || c > arm64.BIG) {
		// cannot have more than 16-bit of immediate in ADD, etc.
		// instead, MOV into register first.
		var ntmp gc.Node
		regalloc(&ntmp, gc.Types[gc.TINT64], nil)

		gins(arm64.AMOVD, &n1, &ntmp)
		gins(as, &ntmp, n2)
		regfree(&ntmp)
		return
	}

	gins(as, &n1, n2)
}

/*
 * generate
 *	as n, $c (CMP)
 */
func ginscon2(as int, n2 *gc.Node, c int64) {
	var n1 gc.Node

	gc.Nodconst(&n1, gc.Types[gc.TINT64], c)

	switch as {
	default:
		gc.Fatal("ginscon2")

	case arm64.ACMP:
		if -arm64.BIG <= c && c <= arm64.BIG {
			gcmp(as, n2, &n1)
			return
		}
	}

	// MOV n1 into register first
	var ntmp gc.Node
	regalloc(&ntmp, gc.Types[gc.TINT64], nil)

	gins(arm64.AMOVD, &n1, &ntmp)
	gcmp(as, n2, &ntmp)
	regfree(&ntmp)
}

/*
 * generate move:
 *	t = f
 * hard part is conversions.
 */
func gmove(f *gc.Node, t *gc.Node) {
	if gc.Debug['M'] != 0 {
		fmt.Printf("gmove %v -> %v\n", gc.Nconv(f, obj.FmtLong), gc.Nconv(t, obj.FmtLong))
	}

	ft := int(gc.Simsimtype(f.Type))
	tt := int(gc.Simsimtype(t.Type))
	cvt := (*gc.Type)(t.Type)

	if gc.Iscomplex[ft] || gc.Iscomplex[tt] {
		gc.Complexmove(f, t)
		return
	}

	// cannot have two memory operands
	var r1 gc.Node
	var a int
	if gc.Ismem(f) && gc.Ismem(t) {
		goto hard
	}

	// convert constant to desired type
	if f.Op == gc.OLITERAL {
		var con gc.Node
		switch tt {
		default:
			gc.Convconst(&con, t.Type, &f.Val)

		case gc.TINT32,
			gc.TINT16,
			gc.TINT8:
			var con gc.Node
			gc.Convconst(&con, gc.Types[gc.TINT64], &f.Val)
			var r1 gc.Node
			regalloc(&r1, con.Type, t)
			gins(arm64.AMOVD, &con, &r1)
			gmove(&r1, t)
			regfree(&r1)
			return

		case gc.TUINT32,
			gc.TUINT16,
			gc.TUINT8:
			var con gc.Node
			gc.Convconst(&con, gc.Types[gc.TUINT64], &f.Val)
			var r1 gc.Node
			regalloc(&r1, con.Type, t)
			gins(arm64.AMOVD, &con, &r1)
			gmove(&r1, t)
			regfree(&r1)
			return
		}

		f = &con
		ft = tt // so big switch will choose a simple mov

		// constants can't move directly to memory.
		if gc.Ismem(t) {
			goto hard
		}
	}

	// value -> value copy, first operand in memory.
	// any floating point operand requires register
	// src, so goto hard to copy to register first.
	if gc.Ismem(f) && ft != tt && (gc.Isfloat[ft] || gc.Isfloat[tt]) {
		cvt = gc.Types[ft]
		goto hard
	}

	// value -> value copy, only one memory operand.
	// figure out the instruction to use.
	// break out of switch for one-instruction gins.
	// goto rdst for "destination must be register".
	// goto hard for "convert to cvt type first".
	// otherwise handle and return.

	switch uint32(ft)<<16 | uint32(tt) {
	default:
		gc.Fatal("gmove %v -> %v", gc.Tconv(f.Type, obj.FmtLong), gc.Tconv(t.Type, obj.FmtLong))

		/*
		 * integer copy and truncate
		 */
	case gc.TINT8<<16 | gc.TINT8, // same size
		gc.TUINT8<<16 | gc.TINT8,
		gc.TINT16<<16 | gc.TINT8,
		// truncate
		gc.TUINT16<<16 | gc.TINT8,
		gc.TINT32<<16 | gc.TINT8,
		gc.TUINT32<<16 | gc.TINT8,
		gc.TINT64<<16 | gc.TINT8,
		gc.TUINT64<<16 | gc.TINT8:
		a = arm64.AMOVB

	case gc.TINT8<<16 | gc.TUINT8, // same size
		gc.TUINT8<<16 | gc.TUINT8,
		gc.TINT16<<16 | gc.TUINT8,
		// truncate
		gc.TUINT16<<16 | gc.TUINT8,
		gc.TINT32<<16 | gc.TUINT8,
		gc.TUINT32<<16 | gc.TUINT8,
		gc.TINT64<<16 | gc.TUINT8,
		gc.TUINT64<<16 | gc.TUINT8:
		a = arm64.AMOVBU

	case gc.TINT16<<16 | gc.TINT16, // same size
		gc.TUINT16<<16 | gc.TINT16,
		gc.TINT32<<16 | gc.TINT16,
		// truncate
		gc.TUINT32<<16 | gc.TINT16,
		gc.TINT64<<16 | gc.TINT16,
		gc.TUINT64<<16 | gc.TINT16:
		a = arm64.AMOVH

	case gc.TINT16<<16 | gc.TUINT16, // same size
		gc.TUINT16<<16 | gc.TUINT16,
		gc.TINT32<<16 | gc.TUINT16,
		// truncate
		gc.TUINT32<<16 | gc.TUINT16,
		gc.TINT64<<16 | gc.TUINT16,
		gc.TUINT64<<16 | gc.TUINT16:
		a = arm64.AMOVHU

	case gc.TINT32<<16 | gc.TINT32, // same size
		gc.TUINT32<<16 | gc.TINT32,
		gc.TINT64<<16 | gc.TINT32,
		// truncate
		gc.TUINT64<<16 | gc.TINT32:
		a = arm64.AMOVW

	case gc.TINT32<<16 | gc.TUINT32, // same size
		gc.TUINT32<<16 | gc.TUINT32,
		gc.TINT64<<16 | gc.TUINT32,
		gc.TUINT64<<16 | gc.TUINT32:
		a = arm64.AMOVWU

	case gc.TINT64<<16 | gc.TINT64, // same size
		gc.TINT64<<16 | gc.TUINT64,
		gc.TUINT64<<16 | gc.TINT64,
		gc.TUINT64<<16 | gc.TUINT64:
		a = arm64.AMOVD

		/*
		 * integer up-conversions
		 */
	case gc.TINT8<<16 | gc.TINT16, // sign extend int8
		gc.TINT8<<16 | gc.TUINT16,
		gc.TINT8<<16 | gc.TINT32,
		gc.TINT8<<16 | gc.TUINT32,
		gc.TINT8<<16 | gc.TINT64,
		gc.TINT8<<16 | gc.TUINT64:
		a = arm64.AMOVB

		goto rdst

	case gc.TUINT8<<16 | gc.TINT16, // zero extend uint8
		gc.TUINT8<<16 | gc.TUINT16,
		gc.TUINT8<<16 | gc.TINT32,
		gc.TUINT8<<16 | gc.TUINT32,
		gc.TUINT8<<16 | gc.TINT64,
		gc.TUINT8<<16 | gc.TUINT64:
		a = arm64.AMOVBU

		goto rdst

	case gc.TINT16<<16 | gc.TINT32, // sign extend int16
		gc.TINT16<<16 | gc.TUINT32,
		gc.TINT16<<16 | gc.TINT64,
		gc.TINT16<<16 | gc.TUINT64:
		a = arm64.AMOVH

		goto rdst

	case gc.TUINT16<<16 | gc.TINT32, // zero extend uint16
		gc.TUINT16<<16 | gc.TUINT32,
		gc.TUINT16<<16 | gc.TINT64,
		gc.TUINT16<<16 | gc.TUINT64:
		a = arm64.AMOVHU

		goto rdst

	case gc.TINT32<<16 | gc.TINT64, // sign extend int32
		gc.TINT32<<16 | gc.TUINT64:
		a = arm64.AMOVW

		goto rdst

	case gc.TUINT32<<16 | gc.TINT64, // zero extend uint32
		gc.TUINT32<<16 | gc.TUINT64:
		a = arm64.AMOVWU

		goto rdst

	/*
	* float to integer
	 */
	case gc.TFLOAT32<<16 | gc.TINT32:
		a = arm64.AFCVTZSSW
		goto rdst

	case gc.TFLOAT64<<16 | gc.TINT32:
		a = arm64.AFCVTZSDW
		goto rdst

	case gc.TFLOAT32<<16 | gc.TINT64:
		a = arm64.AFCVTZSS
		goto rdst

	case gc.TFLOAT64<<16 | gc.TINT64:
		a = arm64.AFCVTZSD
		goto rdst

	case gc.TFLOAT32<<16 | gc.TUINT32:
		a = arm64.AFCVTZUSW
		goto rdst

	case gc.TFLOAT64<<16 | gc.TUINT32:
		a = arm64.AFCVTZUDW
		goto rdst

	case gc.TFLOAT32<<16 | gc.TUINT64:
		a = arm64.AFCVTZUS
		goto rdst

	case gc.TFLOAT64<<16 | gc.TUINT64:
		a = arm64.AFCVTZUD
		goto rdst

	case gc.TFLOAT32<<16 | gc.TINT16,
		gc.TFLOAT32<<16 | gc.TINT8,
		gc.TFLOAT64<<16 | gc.TINT16,
		gc.TFLOAT64<<16 | gc.TINT8:
		cvt = gc.Types[gc.TINT32]

		goto hard

	case gc.TFLOAT32<<16 | gc.TUINT16,
		gc.TFLOAT32<<16 | gc.TUINT8,
		gc.TFLOAT64<<16 | gc.TUINT16,
		gc.TFLOAT64<<16 | gc.TUINT8:
		cvt = gc.Types[gc.TUINT32]

		goto hard

	/*
	 * integer to float
	 */
	case gc.TINT8<<16 | gc.TFLOAT32,
		gc.TINT16<<16 | gc.TFLOAT32,
		gc.TINT32<<16 | gc.TFLOAT32:
		a = arm64.ASCVTFWS

		goto rdst

	case gc.TINT8<<16 | gc.TFLOAT64,
		gc.TINT16<<16 | gc.TFLOAT64,
		gc.TINT32<<16 | gc.TFLOAT64:
		a = arm64.ASCVTFWD

		goto rdst

	case gc.TINT64<<16 | gc.TFLOAT32:
		a = arm64.ASCVTFS
		goto rdst

	case gc.TINT64<<16 | gc.TFLOAT64:
		a = arm64.ASCVTFD
		goto rdst

	case gc.TUINT8<<16 | gc.TFLOAT32,
		gc.TUINT16<<16 | gc.TFLOAT32,
		gc.TUINT32<<16 | gc.TFLOAT32:
		a = arm64.AUCVTFWS

		goto rdst

	case gc.TUINT8<<16 | gc.TFLOAT64,
		gc.TUINT16<<16 | gc.TFLOAT64,
		gc.TUINT32<<16 | gc.TFLOAT64:
		a = arm64.AUCVTFWD

		goto rdst

	case gc.TUINT64<<16 | gc.TFLOAT32:
		a = arm64.AUCVTFS
		goto rdst

	case gc.TUINT64<<16 | gc.TFLOAT64:
		a = arm64.AUCVTFD
		goto rdst

		/*
		 * float to float
		 */
	case gc.TFLOAT32<<16 | gc.TFLOAT32:
		a = arm64.AFMOVS

	case gc.TFLOAT64<<16 | gc.TFLOAT64:
		a = arm64.AFMOVD

	case gc.TFLOAT32<<16 | gc.TFLOAT64:
		a = arm64.AFCVTSD
		goto rdst

	case gc.TFLOAT64<<16 | gc.TFLOAT32:
		a = arm64.AFCVTDS
		goto rdst
	}

	gins(a, f, t)
	return

	// requires register destination
rdst:
	regalloc(&r1, t.Type, t)

	gins(a, f, &r1)
	gmove(&r1, t)
	regfree(&r1)
	return

	// requires register intermediate
hard:
	regalloc(&r1, cvt, t)

	gmove(f, &r1)
	gmove(&r1, t)
	regfree(&r1)
	return
}

/*
 * generate one instruction:
 *	as f, t
 */
func gins(as int, f *gc.Node, t *gc.Node) *obj.Prog {
	// TODO(austin): Add self-move test like in 6g (but be careful
	// of truncation moves)

	af := obj.Addr(obj.Addr{})

	at := obj.Addr(obj.Addr{})
	if f != nil {
		af = gc.Naddr(f)
	}
	if t != nil {
		at = gc.Naddr(t)
	}
	p := (*obj.Prog)(gc.Prog(as))
	if f != nil {
		p.From = af
	}
	if t != nil {
		p.To = at
	}
	if gc.Debug['g'] != 0 {
		fmt.Printf("%v\n", p)
	}

	w := int32(0)
	switch as {
	case arm64.AMOVB,
		arm64.AMOVBU:
		w = 1

	case arm64.AMOVH,
		arm64.AMOVHU:
		w = 2

	case arm64.AMOVW,
		arm64.AMOVWU:
		w = 4

	case arm64.AMOVD:
		if af.Type == obj.TYPE_CONST || af.Type == obj.TYPE_ADDR {
			break
		}
		w = 8
	}

	if w != 0 && ((f != nil && af.Width < int64(w)) || (t != nil && at.Type != obj.TYPE_REG && at.Width > int64(w))) {
		gc.Dump("f", f)
		gc.Dump("t", t)
		gc.Fatal("bad width: %v (%d, %d)\n", p, af.Width, at.Width)
	}

	return p
}

func fixlargeoffset(n *gc.Node) {
	if n == nil {
		return
	}
	if n.Op != gc.OINDREG {
		return
	}
	if -4096 <= n.Xoffset && n.Xoffset < 4096 {
		return
	}
	a := gc.Node(*n)
	a.Op = gc.OREGISTER
	a.Type = gc.Types[gc.Tptr]
	a.Xoffset = 0
	gc.Cgen_checknil(&a)
	ginscon(optoas(gc.OADD, gc.Types[gc.Tptr]), n.Xoffset, &a)
	n.Xoffset = 0
}

/*
 * insert n into reg slot of p
 */
func raddr(n *gc.Node, p *obj.Prog) {
	var a obj.Addr

	a = gc.Naddr(n)
	if a.Type != obj.TYPE_REG {
		if n != nil {
			gc.Fatal("bad in raddr: %v", gc.Oconv(int(n.Op), 0))
		} else {
			gc.Fatal("bad in raddr: <null>")
		}
		p.Reg = 0
	} else {
		p.Reg = a.Reg
	}
}

func gcmp(as int, lhs *gc.Node, rhs *gc.Node) *obj.Prog {
	if lhs.Op != gc.OREGISTER {
		gc.Fatal("bad operands to gcmp: %v %v", gc.Oconv(int(lhs.Op), 0), gc.Oconv(int(rhs.Op), 0))
	}

	p := gins(as, rhs, nil)
	raddr(lhs, p)
	return p
}

/*
 * return Axxx for Oxxx on type t.
 */
func optoas(op int, t *gc.Type) int {
	if t == nil {
		gc.Fatal("optoas: t is nil")
	}

	a := int(obj.AXXX)
	switch uint32(op)<<16 | uint32(gc.Simtype[t.Etype]) {
	default:
		gc.Fatal("optoas: no entry for op=%v type=%v", gc.Oconv(int(op), 0), gc.Tconv(t, 0))

	case gc.OEQ<<16 | gc.TBOOL,
		gc.OEQ<<16 | gc.TINT8,
		gc.OEQ<<16 | gc.TUINT8,
		gc.OEQ<<16 | gc.TINT16,
		gc.OEQ<<16 | gc.TUINT16,
		gc.OEQ<<16 | gc.TINT32,
		gc.OEQ<<16 | gc.TUINT32,
		gc.OEQ<<16 | gc.TINT64,
		gc.OEQ<<16 | gc.TUINT64,
		gc.OEQ<<16 | gc.TPTR32,
		gc.OEQ<<16 | gc.TPTR64,
		gc.OEQ<<16 | gc.TFLOAT32,
		gc.OEQ<<16 | gc.TFLOAT64:
		a = arm64.ABEQ

	case gc.ONE<<16 | gc.TBOOL,
		gc.ONE<<16 | gc.TINT8,
		gc.ONE<<16 | gc.TUINT8,
		gc.ONE<<16 | gc.TINT16,
		gc.ONE<<16 | gc.TUINT16,
		gc.ONE<<16 | gc.TINT32,
		gc.ONE<<16 | gc.TUINT32,
		gc.ONE<<16 | gc.TINT64,
		gc.ONE<<16 | gc.TUINT64,
		gc.ONE<<16 | gc.TPTR32,
		gc.ONE<<16 | gc.TPTR64,
		gc.ONE<<16 | gc.TFLOAT32,
		gc.ONE<<16 | gc.TFLOAT64:
		a = arm64.ABNE

	case gc.OLT<<16 | gc.TINT8,
		gc.OLT<<16 | gc.TINT16,
		gc.OLT<<16 | gc.TINT32,
		gc.OLT<<16 | gc.TINT64:
		a = arm64.ABLT

	case gc.OLT<<16 | gc.TUINT8,
		gc.OLT<<16 | gc.TUINT16,
		gc.OLT<<16 | gc.TUINT32,
		gc.OLT<<16 | gc.TUINT64,
		gc.OLT<<16 | gc.TFLOAT32,
		gc.OLT<<16 | gc.TFLOAT64:
		a = arm64.ABLO

	case gc.OLE<<16 | gc.TINT8,
		gc.OLE<<16 | gc.TINT16,
		gc.OLE<<16 | gc.TINT32,
		gc.OLE<<16 | gc.TINT64:
		a = arm64.ABLE

	case gc.OLE<<16 | gc.TUINT8,
		gc.OLE<<16 | gc.TUINT16,
		gc.OLE<<16 | gc.TUINT32,
		gc.OLE<<16 | gc.TUINT64,
		gc.OLE<<16 | gc.TFLOAT32,
		gc.OLE<<16 | gc.TFLOAT64:
		a = arm64.ABLS

	case gc.OGT<<16 | gc.TINT8,
		gc.OGT<<16 | gc.TINT16,
		gc.OGT<<16 | gc.TINT32,
		gc.OGT<<16 | gc.TINT64,
		gc.OGT<<16 | gc.TFLOAT32,
		gc.OGT<<16 | gc.TFLOAT64:
		a = arm64.ABGT

	case gc.OGT<<16 | gc.TUINT8,
		gc.OGT<<16 | gc.TUINT16,
		gc.OGT<<16 | gc.TUINT32,
		gc.OGT<<16 | gc.TUINT64:
		a = arm64.ABHI

	case gc.OGE<<16 | gc.TINT8,
		gc.OGE<<16 | gc.TINT16,
		gc.OGE<<16 | gc.TINT32,
		gc.OGE<<16 | gc.TINT64,
		gc.OGE<<16 | gc.TFLOAT32,
		gc.OGE<<16 | gc.TFLOAT64:
		a = arm64.ABGE

	case gc.OGE<<16 | gc.TUINT8,
		gc.OGE<<16 | gc.TUINT16,
		gc.OGE<<16 | gc.TUINT32,
		gc.OGE<<16 | gc.TUINT64:
		a = arm64.ABHS

	case gc.OCMP<<16 | gc.TBOOL,
		gc.OCMP<<16 | gc.TINT8,
		gc.OCMP<<16 | gc.TINT16,
		gc.OCMP<<16 | gc.TINT32,
		gc.OCMP<<16 | gc.TPTR32,
		gc.OCMP<<16 | gc.TINT64,
		gc.OCMP<<16 | gc.TUINT8,
		gc.OCMP<<16 | gc.TUINT16,
		gc.OCMP<<16 | gc.TUINT32,
		gc.OCMP<<16 | gc.TUINT64,
		gc.OCMP<<16 | gc.TPTR64:
		a = arm64.ACMP

	case gc.OCMP<<16 | gc.TFLOAT32:
		a = arm64.AFCMPS

	case gc.OCMP<<16 | gc.TFLOAT64:
		a = arm64.AFCMPD

	case gc.OAS<<16 | gc.TBOOL,
		gc.OAS<<16 | gc.TINT8:
		a = arm64.AMOVB

	case gc.OAS<<16 | gc.TUINT8:
		a = arm64.AMOVBU

	case gc.OAS<<16 | gc.TINT16:
		a = arm64.AMOVH

	case gc.OAS<<16 | gc.TUINT16:
		a = arm64.AMOVHU

	case gc.OAS<<16 | gc.TINT32:
		a = arm64.AMOVW

	case gc.OAS<<16 | gc.TUINT32,
		gc.OAS<<16 | gc.TPTR32:
		a = arm64.AMOVWU

	case gc.OAS<<16 | gc.TINT64,
		gc.OAS<<16 | gc.TUINT64,
		gc.OAS<<16 | gc.TPTR64:
		a = arm64.AMOVD

	case gc.OAS<<16 | gc.TFLOAT32:
		a = arm64.AFMOVS

	case gc.OAS<<16 | gc.TFLOAT64:
		a = arm64.AFMOVD

	case gc.OADD<<16 | gc.TINT8,
		gc.OADD<<16 | gc.TUINT8,
		gc.OADD<<16 | gc.TINT16,
		gc.OADD<<16 | gc.TUINT16,
		gc.OADD<<16 | gc.TINT32,
		gc.OADD<<16 | gc.TUINT32,
		gc.OADD<<16 | gc.TPTR32,
		gc.OADD<<16 | gc.TINT64,
		gc.OADD<<16 | gc.TUINT64,
		gc.OADD<<16 | gc.TPTR64:
		a = arm64.AADD

	case gc.OADD<<16 | gc.TFLOAT32:
		a = arm64.AFADDS

	case gc.OADD<<16 | gc.TFLOAT64:
		a = arm64.AFADDD

	case gc.OSUB<<16 | gc.TINT8,
		gc.OSUB<<16 | gc.TUINT8,
		gc.OSUB<<16 | gc.TINT16,
		gc.OSUB<<16 | gc.TUINT16,
		gc.OSUB<<16 | gc.TINT32,
		gc.OSUB<<16 | gc.TUINT32,
		gc.OSUB<<16 | gc.TPTR32,
		gc.OSUB<<16 | gc.TINT64,
		gc.OSUB<<16 | gc.TUINT64,
		gc.OSUB<<16 | gc.TPTR64:
		a = arm64.ASUB

	case gc.OSUB<<16 | gc.TFLOAT32:
		a = arm64.AFSUBS

	case gc.OSUB<<16 | gc.TFLOAT64:
		a = arm64.AFSUBD

	case gc.OMINUS<<16 | gc.TINT8,
		gc.OMINUS<<16 | gc.TUINT8,
		gc.OMINUS<<16 | gc.TINT16,
		gc.OMINUS<<16 | gc.TUINT16,
		gc.OMINUS<<16 | gc.TINT32,
		gc.OMINUS<<16 | gc.TUINT32,
		gc.OMINUS<<16 | gc.TPTR32,
		gc.OMINUS<<16 | gc.TINT64,
		gc.OMINUS<<16 | gc.TUINT64,
		gc.OMINUS<<16 | gc.TPTR64:
		a = arm64.ANEG

	case gc.OMINUS<<16 | gc.TFLOAT32:
		a = arm64.AFNEGS

	case gc.OMINUS<<16 | gc.TFLOAT64:
		a = arm64.AFNEGD

	case gc.OAND<<16 | gc.TINT8,
		gc.OAND<<16 | gc.TUINT8,
		gc.OAND<<16 | gc.TINT16,
		gc.OAND<<16 | gc.TUINT16,
		gc.OAND<<16 | gc.TINT32,
		gc.OAND<<16 | gc.TUINT32,
		gc.OAND<<16 | gc.TPTR32,
		gc.OAND<<16 | gc.TINT64,
		gc.OAND<<16 | gc.TUINT64,
		gc.OAND<<16 | gc.TPTR64:
		a = arm64.AAND

	case gc.OOR<<16 | gc.TINT8,
		gc.OOR<<16 | gc.TUINT8,
		gc.OOR<<16 | gc.TINT16,
		gc.OOR<<16 | gc.TUINT16,
		gc.OOR<<16 | gc.TINT32,
		gc.OOR<<16 | gc.TUINT32,
		gc.OOR<<16 | gc.TPTR32,
		gc.OOR<<16 | gc.TINT64,
		gc.OOR<<16 | gc.TUINT64,
		gc.OOR<<16 | gc.TPTR64:
		a = arm64.AORR

	case gc.OXOR<<16 | gc.TINT8,
		gc.OXOR<<16 | gc.TUINT8,
		gc.OXOR<<16 | gc.TINT16,
		gc.OXOR<<16 | gc.TUINT16,
		gc.OXOR<<16 | gc.TINT32,
		gc.OXOR<<16 | gc.TUINT32,
		gc.OXOR<<16 | gc.TPTR32,
		gc.OXOR<<16 | gc.TINT64,
		gc.OXOR<<16 | gc.TUINT64,
		gc.OXOR<<16 | gc.TPTR64:
		a = arm64.AEOR

		// TODO(minux): handle rotates
	//case CASE(OLROT, TINT8):
	//case CASE(OLROT, TUINT8):
	//case CASE(OLROT, TINT16):
	//case CASE(OLROT, TUINT16):
	//case CASE(OLROT, TINT32):
	//case CASE(OLROT, TUINT32):
	//case CASE(OLROT, TPTR32):
	//case CASE(OLROT, TINT64):
	//case CASE(OLROT, TUINT64):
	//case CASE(OLROT, TPTR64):
	//	a = 0//???; RLDC?
	//	break;

	case gc.OLSH<<16 | gc.TINT8,
		gc.OLSH<<16 | gc.TUINT8,
		gc.OLSH<<16 | gc.TINT16,
		gc.OLSH<<16 | gc.TUINT16,
		gc.OLSH<<16 | gc.TINT32,
		gc.OLSH<<16 | gc.TUINT32,
		gc.OLSH<<16 | gc.TPTR32,
		gc.OLSH<<16 | gc.TINT64,
		gc.OLSH<<16 | gc.TUINT64,
		gc.OLSH<<16 | gc.TPTR64:
		a = arm64.ALSL

	case gc.ORSH<<16 | gc.TUINT8,
		gc.ORSH<<16 | gc.TUINT16,
		gc.ORSH<<16 | gc.TUINT32,
		gc.ORSH<<16 | gc.TPTR32,
		gc.ORSH<<16 | gc.TUINT64,
		gc.ORSH<<16 | gc.TPTR64:
		a = arm64.ALSR

	case gc.ORSH<<16 | gc.TINT8,
		gc.ORSH<<16 | gc.TINT16,
		gc.ORSH<<16 | gc.TINT32,
		gc.ORSH<<16 | gc.TINT64:
		a = arm64.AASR

		// TODO(minux): handle rotates
	//case CASE(ORROTC, TINT8):
	//case CASE(ORROTC, TUINT8):
	//case CASE(ORROTC, TINT16):
	//case CASE(ORROTC, TUINT16):
	//case CASE(ORROTC, TINT32):
	//case CASE(ORROTC, TUINT32):
	//case CASE(ORROTC, TINT64):
	//case CASE(ORROTC, TUINT64):
	//	a = 0//??? RLDC??
	//	break;

	case gc.OHMUL<<16 | gc.TINT64:
		a = arm64.ASMULH

	case gc.OHMUL<<16 | gc.TUINT64,
		gc.OHMUL<<16 | gc.TPTR64:
		a = arm64.AUMULH

	case gc.OMUL<<16 | gc.TINT8,
		gc.OMUL<<16 | gc.TINT16,
		gc.OMUL<<16 | gc.TINT32:
		a = arm64.ASMULL

	case gc.OMUL<<16 | gc.TINT64:
		a = arm64.AMUL

	case gc.OMUL<<16 | gc.TUINT8,
		gc.OMUL<<16 | gc.TUINT16,
		gc.OMUL<<16 | gc.TUINT32,
		gc.OMUL<<16 | gc.TPTR32:
		// don't use word multiply, the high 32-bit are undefined.
		a = arm64.AUMULL

	case gc.OMUL<<16 | gc.TUINT64,
		gc.OMUL<<16 | gc.TPTR64:
		a = arm64.AMUL // for 64-bit multiplies, signedness doesn't matter.

	case gc.OMUL<<16 | gc.TFLOAT32:
		a = arm64.AFMULS

	case gc.OMUL<<16 | gc.TFLOAT64:
		a = arm64.AFMULD

	case gc.ODIV<<16 | gc.TINT8,
		gc.ODIV<<16 | gc.TINT16,
		gc.ODIV<<16 | gc.TINT32,
		gc.ODIV<<16 | gc.TINT64:
		a = arm64.ASDIV

	case gc.ODIV<<16 | gc.TUINT8,
		gc.ODIV<<16 | gc.TUINT16,
		gc.ODIV<<16 | gc.TUINT32,
		gc.ODIV<<16 | gc.TPTR32,
		gc.ODIV<<16 | gc.TUINT64,
		gc.ODIV<<16 | gc.TPTR64:
		a = arm64.AUDIV

	case gc.ODIV<<16 | gc.TFLOAT32:
		a = arm64.AFDIVS

	case gc.ODIV<<16 | gc.TFLOAT64:
		a = arm64.AFDIVD
	}

	return a
}

const (
	ODynam   = 1 << 0
	OAddable = 1 << 1
)

func xgen(n *gc.Node, a *gc.Node, o int) bool {
	// TODO(minux)

	return -1 != 0 /*TypeKind(100016)*/
}

func sudoclean() {
	return
}

/*
 * generate code to compute address of n,
 * a reference to a (perhaps nested) field inside
 * an array or struct.
 * return 0 on failure, 1 on success.
 * on success, leaves usable address in a.
 *
 * caller is responsible for calling sudoclean
 * after successful sudoaddable,
 * to release the register used for a.
 */
func sudoaddable(as int, n *gc.Node, a *obj.Addr) bool {
	// TODO(minux)

	*a = obj.Addr{}
	return false
}

Example #3

Show file

File: gsubr.go Project: klueska/go-akaros

func anyregalloc() bool {
	var j int

	for i := x86.REG_AX; i <= x86.REG_R15; i++ {
		if reg[i] == 0 {
			goto ok
		}
		for j = 0; j < len(resvd); j++ {
			if resvd[j] == i {
				goto ok
			}
		}
		return true
	ok:
	}

	return false
}

var regpc [x86.REG_R15 + 1 - x86.REG_AX]uint32

/*
 * allocate register of type t, leave in n.
 * if o != N, o is desired fixed register.
 * caller must regfree(n).
 */
func regalloc(n *gc.Node, t *gc.Type, o *gc.Node) {
	if t == nil {
		gc.Fatal("regalloc: t nil")
	}
	et := int(gc.Simtype[t.Etype])

	var i int
	switch et {
	case gc.TINT8,
		gc.TUINT8,
		gc.TINT16,
		gc.TUINT16,
		gc.TINT32,
		gc.TUINT32,
		gc.TINT64,
		gc.TUINT64,
		gc.TPTR32,
		gc.TPTR64,
		gc.TBOOL:
		if o != nil && o.Op == gc.OREGISTER {
			i = int(o.Val.U.Reg)
			if i >= x86.REG_AX && i <= x86.REG_R15 {
				goto out
			}
		}

		for i = x86.REG_AX; i <= x86.REG_R15; i++ {
			if reg[i] == 0 {
				regpc[i-x86.REG_AX] = uint32(obj.Getcallerpc(&n))
				goto out
			}
		}

		gc.Flusherrors()
		for i := 0; i+x86.REG_AX <= x86.REG_R15; i++ {
			fmt.Printf("%d %p\n", i, regpc[i])
		}
		gc.Fatal("out of fixed registers")

	case gc.TFLOAT32,
		gc.TFLOAT64:
		if o != nil && o.Op == gc.OREGISTER {
			i = int(o.Val.U.Reg)
			if i >= x86.REG_X0 && i <= x86.REG_X15 {
				goto out
			}
		}

		for i = x86.REG_X0; i <= x86.REG_X15; i++ {
			if reg[i] == 0 {
				goto out
			}
		}
		gc.Fatal("out of floating registers")

	case gc.TCOMPLEX64,
		gc.TCOMPLEX128:
		gc.Tempname(n, t)
		return
	}

	gc.Fatal("regalloc: unknown type %v", gc.Tconv(t, 0))
	return

out:
	reg[i]++
	gc.Nodreg(n, t, i)
}

func regfree(n *gc.Node) {
	if n.Op == gc.ONAME {
		return
	}
	if n.Op != gc.OREGISTER && n.Op != gc.OINDREG {
		gc.Fatal("regfree: not a register")
	}
	i := int(n.Val.U.Reg)
	if i == x86.REG_SP {
		return
	}
	if i < 0 || i >= len(reg) {
		gc.Fatal("regfree: reg out of range")
	}
	if reg[i] <= 0 {
		gc.Fatal("regfree: reg not allocated")
	}
	reg[i]--
	if reg[i] == 0 && x86.REG_AX <= i && i <= x86.REG_R15 {
		regpc[i-x86.REG_AX] = 0
	}
}

/*
 * generate
 *	as $c, reg
 */
func gconreg(as int, c int64, reg int) {
	var nr gc.Node

	switch as {
	case x86.AADDL,
		x86.AMOVL,
		x86.ALEAL:
		gc.Nodreg(&nr, gc.Types[gc.TINT32], reg)

	default:
		gc.Nodreg(&nr, gc.Types[gc.TINT64], reg)
	}

	ginscon(as, c, &nr)
}

/*
 * generate
 *	as $c, n
 */
func ginscon(as int, c int64, n2 *gc.Node) {
	var n1 gc.Node

	switch as {
	case x86.AADDL,
		x86.AMOVL,
		x86.ALEAL:
		gc.Nodconst(&n1, gc.Types[gc.TINT32], c)

	default:
		gc.Nodconst(&n1, gc.Types[gc.TINT64], c)
	}

	if as != x86.AMOVQ && (c < -(1<<31) || c >= 1<<31) {
		// cannot have 64-bit immediate in ADD, etc.
		// instead, MOV into register first.
		var ntmp gc.Node
		regalloc(&ntmp, gc.Types[gc.TINT64], nil)

		gins(x86.AMOVQ, &n1, &ntmp)
		gins(as, &ntmp, n2)
		regfree(&ntmp)
		return
	}

	gins(as, &n1, n2)
}

/*
 * set up nodes representing 2^63
 */
var bigi gc.Node

var bigf gc.Node

var bignodes_did int

func bignodes() {
	if bignodes_did != 0 {
		return
	}
	bignodes_did = 1

	gc.Nodconst(&bigi, gc.Types[gc.TUINT64], 1)
	gc.Mpshiftfix(bigi.Val.U.Xval, 63)

	bigf = bigi
	bigf.Type = gc.Types[gc.TFLOAT64]
	bigf.Val.Ctype = gc.CTFLT
	bigf.Val.U.Fval = new(gc.Mpflt)
	gc.Mpmovefixflt(bigf.Val.U.Fval, bigi.Val.U.Xval)
}

/*
 * generate move:
 *	t = f
 * hard part is conversions.
 */
func gmove(f *gc.Node, t *gc.Node) {
	if gc.Debug['M'] != 0 {
		fmt.Printf("gmove %v -> %v\n", gc.Nconv(f, obj.FmtLong), gc.Nconv(t, obj.FmtLong))
	}

	ft := gc.Simsimtype(f.Type)
	tt := gc.Simsimtype(t.Type)
	cvt := t.Type

	if gc.Iscomplex[ft] || gc.Iscomplex[tt] {
		gc.Complexmove(f, t)
		return
	}

	// cannot have two memory operands
	var a int
	if gc.Ismem(f) && gc.Ismem(t) {
		goto hard
	}

	// convert constant to desired type
	if f.Op == gc.OLITERAL {
		var con gc.Node
		gc.Convconst(&con, t.Type, &f.Val)
		f = &con
		ft = tt // so big switch will choose a simple mov

		// some constants can't move directly to memory.
		if gc.Ismem(t) {
			// float constants come from memory.
			if gc.Isfloat[tt] {
				goto hard
			}

			// 64-bit immediates are really 32-bit sign-extended
			// unless moving into a register.
			if gc.Isint[tt] {
				if gc.Mpcmpfixfix(con.Val.U.Xval, gc.Minintval[gc.TINT32]) < 0 {
					goto hard
				}
				if gc.Mpcmpfixfix(con.Val.U.Xval, gc.Maxintval[gc.TINT32]) > 0 {
					goto hard
				}
			}
		}
	}

	// value -> value copy, only one memory operand.
	// figure out the instruction to use.
	// break out of switch for one-instruction gins.
	// goto rdst for "destination must be register".
	// goto hard for "convert to cvt type first".
	// otherwise handle and return.

	switch uint32(ft)<<16 | uint32(tt) {
	default:
		gc.Fatal("gmove %v -> %v", gc.Tconv(f.Type, obj.FmtLong), gc.Tconv(t.Type, obj.FmtLong))

		/*
		 * integer copy and truncate
		 */
	case gc.TINT8<<16 | gc.TINT8, // same size
		gc.TINT8<<16 | gc.TUINT8,
		gc.TUINT8<<16 | gc.TINT8,
		gc.TUINT8<<16 | gc.TUINT8,
		gc.TINT16<<16 | gc.TINT8,
		// truncate
		gc.TUINT16<<16 | gc.TINT8,
		gc.TINT32<<16 | gc.TINT8,
		gc.TUINT32<<16 | gc.TINT8,
		gc.TINT64<<16 | gc.TINT8,
		gc.TUINT64<<16 | gc.TINT8,
		gc.TINT16<<16 | gc.TUINT8,
		gc.TUINT16<<16 | gc.TUINT8,
		gc.TINT32<<16 | gc.TUINT8,
		gc.TUINT32<<16 | gc.TUINT8,
		gc.TINT64<<16 | gc.TUINT8,
		gc.TUINT64<<16 | gc.TUINT8:
		a = x86.AMOVB

	case gc.TINT16<<16 | gc.TINT16, // same size
		gc.TINT16<<16 | gc.TUINT16,
		gc.TUINT16<<16 | gc.TINT16,
		gc.TUINT16<<16 | gc.TUINT16,
		gc.TINT32<<16 | gc.TINT16,
		// truncate
		gc.TUINT32<<16 | gc.TINT16,
		gc.TINT64<<16 | gc.TINT16,
		gc.TUINT64<<16 | gc.TINT16,
		gc.TINT32<<16 | gc.TUINT16,
		gc.TUINT32<<16 | gc.TUINT16,
		gc.TINT64<<16 | gc.TUINT16,
		gc.TUINT64<<16 | gc.TUINT16:
		a = x86.AMOVW

	case gc.TINT32<<16 | gc.TINT32, // same size
		gc.TINT32<<16 | gc.TUINT32,
		gc.TUINT32<<16 | gc.TINT32,
		gc.TUINT32<<16 | gc.TUINT32:
		a = x86.AMOVL

	case gc.TINT64<<16 | gc.TINT32, // truncate
		gc.TUINT64<<16 | gc.TINT32,
		gc.TINT64<<16 | gc.TUINT32,
		gc.TUINT64<<16 | gc.TUINT32:
		a = x86.AMOVQL

	case gc.TINT64<<16 | gc.TINT64, // same size
		gc.TINT64<<16 | gc.TUINT64,
		gc.TUINT64<<16 | gc.TINT64,
		gc.TUINT64<<16 | gc.TUINT64:
		a = x86.AMOVQ

		/*
		 * integer up-conversions
		 */
	case gc.TINT8<<16 | gc.TINT16, // sign extend int8
		gc.TINT8<<16 | gc.TUINT16:
		a = x86.AMOVBWSX

		goto rdst

	case gc.TINT8<<16 | gc.TINT32,
		gc.TINT8<<16 | gc.TUINT32:
		a = x86.AMOVBLSX
		goto rdst

	case gc.TINT8<<16 | gc.TINT64,
		gc.TINT8<<16 | gc.TUINT64:
		a = x86.AMOVBQSX
		goto rdst

	case gc.TUINT8<<16 | gc.TINT16, // zero extend uint8
		gc.TUINT8<<16 | gc.TUINT16:
		a = x86.AMOVBWZX

		goto rdst

	case gc.TUINT8<<16 | gc.TINT32,
		gc.TUINT8<<16 | gc.TUINT32:
		a = x86.AMOVBLZX
		goto rdst

	case gc.TUINT8<<16 | gc.TINT64,
		gc.TUINT8<<16 | gc.TUINT64:
		a = x86.AMOVBQZX
		goto rdst

	case gc.TINT16<<16 | gc.TINT32, // sign extend int16
		gc.TINT16<<16 | gc.TUINT32:
		a = x86.AMOVWLSX

		goto rdst

	case gc.TINT16<<16 | gc.TINT64,
		gc.TINT16<<16 | gc.TUINT64:
		a = x86.AMOVWQSX
		goto rdst

	case gc.TUINT16<<16 | gc.TINT32, // zero extend uint16
		gc.TUINT16<<16 | gc.TUINT32:
		a = x86.AMOVWLZX

		goto rdst

	case gc.TUINT16<<16 | gc.TINT64,
		gc.TUINT16<<16 | gc.TUINT64:
		a = x86.AMOVWQZX
		goto rdst

	case gc.TINT32<<16 | gc.TINT64, // sign extend int32
		gc.TINT32<<16 | gc.TUINT64:
		a = x86.AMOVLQSX

		goto rdst

		// AMOVL into a register zeros the top of the register,
	// so this is not always necessary, but if we rely on AMOVL
	// the optimizer is almost certain to screw with us.
	case gc.TUINT32<<16 | gc.TINT64, // zero extend uint32
		gc.TUINT32<<16 | gc.TUINT64:
		a = x86.AMOVLQZX

		goto rdst

		/*
		* float to integer
		 */
	case gc.TFLOAT32<<16 | gc.TINT32:
		a = x86.ACVTTSS2SL

		goto rdst

	case gc.TFLOAT64<<16 | gc.TINT32:
		a = x86.ACVTTSD2SL
		goto rdst

	case gc.TFLOAT32<<16 | gc.TINT64:
		a = x86.ACVTTSS2SQ
		goto rdst

	case gc.TFLOAT64<<16 | gc.TINT64:
		a = x86.ACVTTSD2SQ
		goto rdst

		// convert via int32.
	case gc.TFLOAT32<<16 | gc.TINT16,
		gc.TFLOAT32<<16 | gc.TINT8,
		gc.TFLOAT32<<16 | gc.TUINT16,
		gc.TFLOAT32<<16 | gc.TUINT8,
		gc.TFLOAT64<<16 | gc.TINT16,
		gc.TFLOAT64<<16 | gc.TINT8,
		gc.TFLOAT64<<16 | gc.TUINT16,
		gc.TFLOAT64<<16 | gc.TUINT8:
		cvt = gc.Types[gc.TINT32]

		goto hard

		// convert via int64.
	case gc.TFLOAT32<<16 | gc.TUINT32,
		gc.TFLOAT64<<16 | gc.TUINT32:
		cvt = gc.Types[gc.TINT64]

		goto hard

		// algorithm is:
	//	if small enough, use native float64 -> int64 conversion.
	//	otherwise, subtract 2^63, convert, and add it back.
	case gc.TFLOAT32<<16 | gc.TUINT64,
		gc.TFLOAT64<<16 | gc.TUINT64:
		a := x86.ACVTTSS2SQ

		if ft == gc.TFLOAT64 {
			a = x86.ACVTTSD2SQ
		}
		bignodes()
		var r1 gc.Node
		regalloc(&r1, gc.Types[ft], nil)
		var r2 gc.Node
		regalloc(&r2, gc.Types[tt], t)
		var r3 gc.Node
		regalloc(&r3, gc.Types[ft], nil)
		var r4 gc.Node
		regalloc(&r4, gc.Types[tt], nil)
		gins(optoas(gc.OAS, f.Type), f, &r1)
		gins(optoas(gc.OCMP, f.Type), &bigf, &r1)
		p1 := gc.Gbranch(optoas(gc.OLE, f.Type), nil, +1)
		gins(a, &r1, &r2)
		p2 := gc.Gbranch(obj.AJMP, nil, 0)
		gc.Patch(p1, gc.Pc)
		gins(optoas(gc.OAS, f.Type), &bigf, &r3)
		gins(optoas(gc.OSUB, f.Type), &r3, &r1)
		gins(a, &r1, &r2)
		gins(x86.AMOVQ, &bigi, &r4)
		gins(x86.AXORQ, &r4, &r2)
		gc.Patch(p2, gc.Pc)
		gmove(&r2, t)
		regfree(&r4)
		regfree(&r3)
		regfree(&r2)
		regfree(&r1)
		return

		/*
		 * integer to float
		 */
	case gc.TINT32<<16 | gc.TFLOAT32:
		a = x86.ACVTSL2SS

		goto rdst

	case gc.TINT32<<16 | gc.TFLOAT64:
		a = x86.ACVTSL2SD
		goto rdst

	case gc.TINT64<<16 | gc.TFLOAT32:
		a = x86.ACVTSQ2SS
		goto rdst

	case gc.TINT64<<16 | gc.TFLOAT64:
		a = x86.ACVTSQ2SD
		goto rdst

		// convert via int32
	case gc.TINT16<<16 | gc.TFLOAT32,
		gc.TINT16<<16 | gc.TFLOAT64,
		gc.TINT8<<16 | gc.TFLOAT32,
		gc.TINT8<<16 | gc.TFLOAT64,
		gc.TUINT16<<16 | gc.TFLOAT32,
		gc.TUINT16<<16 | gc.TFLOAT64,
		gc.TUINT8<<16 | gc.TFLOAT32,
		gc.TUINT8<<16 | gc.TFLOAT64:
		cvt = gc.Types[gc.TINT32]

		goto hard

		// convert via int64.
	case gc.TUINT32<<16 | gc.TFLOAT32,
		gc.TUINT32<<16 | gc.TFLOAT64:
		cvt = gc.Types[gc.TINT64]

		goto hard

		// algorithm is:
	//	if small enough, use native int64 -> uint64 conversion.
	//	otherwise, halve (rounding to odd?), convert, and double.
	case gc.TUINT64<<16 | gc.TFLOAT32,
		gc.TUINT64<<16 | gc.TFLOAT64:
		a := x86.ACVTSQ2SS

		if tt == gc.TFLOAT64 {
			a = x86.ACVTSQ2SD
		}
		var zero gc.Node
		gc.Nodconst(&zero, gc.Types[gc.TUINT64], 0)
		var one gc.Node
		gc.Nodconst(&one, gc.Types[gc.TUINT64], 1)
		var r1 gc.Node
		regalloc(&r1, f.Type, f)
		var r2 gc.Node
		regalloc(&r2, t.Type, t)
		var r3 gc.Node
		regalloc(&r3, f.Type, nil)
		var r4 gc.Node
		regalloc(&r4, f.Type, nil)
		gmove(f, &r1)
		gins(x86.ACMPQ, &r1, &zero)
		p1 := gc.Gbranch(x86.AJLT, nil, +1)
		gins(a, &r1, &r2)
		p2 := gc.Gbranch(obj.AJMP, nil, 0)
		gc.Patch(p1, gc.Pc)
		gmove(&r1, &r3)
		gins(x86.ASHRQ, &one, &r3)
		gmove(&r1, &r4)
		gins(x86.AANDL, &one, &r4)
		gins(x86.AORQ, &r4, &r3)
		gins(a, &r3, &r2)
		gins(optoas(gc.OADD, t.Type), &r2, &r2)
		gc.Patch(p2, gc.Pc)
		gmove(&r2, t)
		regfree(&r4)
		regfree(&r3)
		regfree(&r2)
		regfree(&r1)
		return

		/*
		 * float to float
		 */
	case gc.TFLOAT32<<16 | gc.TFLOAT32:
		a = x86.AMOVSS

	case gc.TFLOAT64<<16 | gc.TFLOAT64:
		a = x86.AMOVSD

	case gc.TFLOAT32<<16 | gc.TFLOAT64:
		a = x86.ACVTSS2SD
		goto rdst

	case gc.TFLOAT64<<16 | gc.TFLOAT32:
		a = x86.ACVTSD2SS
		goto rdst
	}

	gins(a, f, t)
	return

	// requires register destination
rdst:
	{
		var r1 gc.Node
		regalloc(&r1, t.Type, t)

		gins(a, f, &r1)
		gmove(&r1, t)
		regfree(&r1)
		return
	}

	// requires register intermediate
hard:
	var r1 gc.Node
	regalloc(&r1, cvt, t)

	gmove(f, &r1)
	gmove(&r1, t)
	regfree(&r1)
	return
}

func samaddr(f *gc.Node, t *gc.Node) bool {
	if f.Op != t.Op {
		return false
	}

	switch f.Op {
	case gc.OREGISTER:
		if f.Val.U.Reg != t.Val.U.Reg {
			break
		}
		return true
	}

	return false
}

/*
 * generate one instruction:
 *	as f, t
 */
func gins(as int, f *gc.Node, t *gc.Node) *obj.Prog {
	//	Node nod;

	//	if(f != N && f->op == OINDEX) {
	//		regalloc(&nod, &regnode, Z);
	//		v = constnode.vconst;
	//		cgen(f->right, &nod);
	//		constnode.vconst = v;
	//		idx.reg = nod.reg;
	//		regfree(&nod);
	//	}
	//	if(t != N && t->op == OINDEX) {
	//		regalloc(&nod, &regnode, Z);
	//		v = constnode.vconst;
	//		cgen(t->right, &nod);
	//		constnode.vconst = v;
	//		idx.reg = nod.reg;
	//		regfree(&nod);
	//	}

	switch as {
	case x86.AMOVB,
		x86.AMOVW,
		x86.AMOVL,
		x86.AMOVQ,
		x86.AMOVSS,
		x86.AMOVSD:
		if f != nil && t != nil && samaddr(f, t) {
			return nil
		}

	case x86.ALEAQ:
		if f != nil && gc.Isconst(f, gc.CTNIL) {
			gc.Fatal("gins LEAQ nil %v", gc.Tconv(f.Type, 0))
		}
	}

	var af obj.Addr
	if f != nil {
		af = gc.Naddr(f)
	}
	var at obj.Addr
	if t != nil {
		at = gc.Naddr(t)
	}
	p := gc.Prog(as)
	if f != nil {
		p.From = af
	}
	if t != nil {
		p.To = at
	}
	if gc.Debug['g'] != 0 {
		fmt.Printf("%v\n", p)
	}

	w := int32(0)
	switch as {
	case x86.AMOVB:
		w = 1

	case x86.AMOVW:
		w = 2

	case x86.AMOVL:
		w = 4

	case x86.AMOVQ:
		w = 8
	}

	if w != 0 && ((f != nil && af.Width < int64(w)) || (t != nil && at.Width > int64(w))) {
		gc.Dump("f", f)
		gc.Dump("t", t)
		gc.Fatal("bad width: %v (%d, %d)\n", p, af.Width, at.Width)
	}

	if p.To.Type == obj.TYPE_ADDR && w > 0 {
		gc.Fatal("bad use of addr: %v", p)
	}

	return p
}

func fixlargeoffset(n *gc.Node) {
	if n == nil {
		return
	}
	if n.Op != gc.OINDREG {
		return
	}
	if n.Val.U.Reg == x86.REG_SP { // stack offset cannot be large
		return
	}
	if n.Xoffset != int64(int32(n.Xoffset)) {
		// offset too large, add to register instead.
		a := *n

		a.Op = gc.OREGISTER
		a.Type = gc.Types[gc.Tptr]
		a.Xoffset = 0
		gc.Cgen_checknil(&a)
		ginscon(optoas(gc.OADD, gc.Types[gc.Tptr]), n.Xoffset, &a)
		n.Xoffset = 0
	}
}

/*
 * return Axxx for Oxxx on type t.
 */
func optoas(op int, t *gc.Type) int {
	if t == nil {
		gc.Fatal("optoas: t is nil")
	}

	a := obj.AXXX
	switch uint32(op)<<16 | uint32(gc.Simtype[t.Etype]) {
	default:
		gc.Fatal("optoas: no entry %v-%v", gc.Oconv(int(op), 0), gc.Tconv(t, 0))

	case gc.OADDR<<16 | gc.TPTR32:
		a = x86.ALEAL

	case gc.OADDR<<16 | gc.TPTR64:
		a = x86.ALEAQ

	case gc.OEQ<<16 | gc.TBOOL,
		gc.OEQ<<16 | gc.TINT8,
		gc.OEQ<<16 | gc.TUINT8,
		gc.OEQ<<16 | gc.TINT16,
		gc.OEQ<<16 | gc.TUINT16,
		gc.OEQ<<16 | gc.TINT32,
		gc.OEQ<<16 | gc.TUINT32,
		gc.OEQ<<16 | gc.TINT64,
		gc.OEQ<<16 | gc.TUINT64,
		gc.OEQ<<16 | gc.TPTR32,
		gc.OEQ<<16 | gc.TPTR64,
		gc.OEQ<<16 | gc.TFLOAT32,
		gc.OEQ<<16 | gc.TFLOAT64:
		a = x86.AJEQ

	case gc.ONE<<16 | gc.TBOOL,
		gc.ONE<<16 | gc.TINT8,
		gc.ONE<<16 | gc.TUINT8,
		gc.ONE<<16 | gc.TINT16,
		gc.ONE<<16 | gc.TUINT16,
		gc.ONE<<16 | gc.TINT32,
		gc.ONE<<16 | gc.TUINT32,
		gc.ONE<<16 | gc.TINT64,
		gc.ONE<<16 | gc.TUINT64,
		gc.ONE<<16 | gc.TPTR32,
		gc.ONE<<16 | gc.TPTR64,
		gc.ONE<<16 | gc.TFLOAT32,
		gc.ONE<<16 | gc.TFLOAT64:
		a = x86.AJNE

	case gc.OLT<<16 | gc.TINT8,
		gc.OLT<<16 | gc.TINT16,
		gc.OLT<<16 | gc.TINT32,
		gc.OLT<<16 | gc.TINT64:
		a = x86.AJLT

	case gc.OLT<<16 | gc.TUINT8,
		gc.OLT<<16 | gc.TUINT16,
		gc.OLT<<16 | gc.TUINT32,
		gc.OLT<<16 | gc.TUINT64:
		a = x86.AJCS

	case gc.OLE<<16 | gc.TINT8,
		gc.OLE<<16 | gc.TINT16,
		gc.OLE<<16 | gc.TINT32,
		gc.OLE<<16 | gc.TINT64:
		a = x86.AJLE

	case gc.OLE<<16 | gc.TUINT8,
		gc.OLE<<16 | gc.TUINT16,
		gc.OLE<<16 | gc.TUINT32,
		gc.OLE<<16 | gc.TUINT64:
		a = x86.AJLS

	case gc.OGT<<16 | gc.TINT8,
		gc.OGT<<16 | gc.TINT16,
		gc.OGT<<16 | gc.TINT32,
		gc.OGT<<16 | gc.TINT64:
		a = x86.AJGT

	case gc.OGT<<16 | gc.TUINT8,
		gc.OGT<<16 | gc.TUINT16,
		gc.OGT<<16 | gc.TUINT32,
		gc.OGT<<16 | gc.TUINT64,
		gc.OLT<<16 | gc.TFLOAT32,
		gc.OLT<<16 | gc.TFLOAT64:
		a = x86.AJHI

	case gc.OGE<<16 | gc.TINT8,
		gc.OGE<<16 | gc.TINT16,
		gc.OGE<<16 | gc.TINT32,
		gc.OGE<<16 | gc.TINT64:
		a = x86.AJGE

	case gc.OGE<<16 | gc.TUINT8,
		gc.OGE<<16 | gc.TUINT16,
		gc.OGE<<16 | gc.TUINT32,
		gc.OGE<<16 | gc.TUINT64,
		gc.OLE<<16 | gc.TFLOAT32,
		gc.OLE<<16 | gc.TFLOAT64:
		a = x86.AJCC

	case gc.OCMP<<16 | gc.TBOOL,
		gc.OCMP<<16 | gc.TINT8,
		gc.OCMP<<16 | gc.TUINT8:
		a = x86.ACMPB

	case gc.OCMP<<16 | gc.TINT16,
		gc.OCMP<<16 | gc.TUINT16:
		a = x86.ACMPW

	case gc.OCMP<<16 | gc.TINT32,
		gc.OCMP<<16 | gc.TUINT32,
		gc.OCMP<<16 | gc.TPTR32:
		a = x86.ACMPL

	case gc.OCMP<<16 | gc.TINT64,
		gc.OCMP<<16 | gc.TUINT64,
		gc.OCMP<<16 | gc.TPTR64:
		a = x86.ACMPQ

	case gc.OCMP<<16 | gc.TFLOAT32:
		a = x86.AUCOMISS

	case gc.OCMP<<16 | gc.TFLOAT64:
		a = x86.AUCOMISD

	case gc.OAS<<16 | gc.TBOOL,
		gc.OAS<<16 | gc.TINT8,
		gc.OAS<<16 | gc.TUINT8:
		a = x86.AMOVB

	case gc.OAS<<16 | gc.TINT16,
		gc.OAS<<16 | gc.TUINT16:
		a = x86.AMOVW

	case gc.OAS<<16 | gc.TINT32,
		gc.OAS<<16 | gc.TUINT32,
		gc.OAS<<16 | gc.TPTR32:
		a = x86.AMOVL

	case gc.OAS<<16 | gc.TINT64,
		gc.OAS<<16 | gc.TUINT64,
		gc.OAS<<16 | gc.TPTR64:
		a = x86.AMOVQ

	case gc.OAS<<16 | gc.TFLOAT32:
		a = x86.AMOVSS

	case gc.OAS<<16 | gc.TFLOAT64:
		a = x86.AMOVSD

	case gc.OADD<<16 | gc.TINT8,
		gc.OADD<<16 | gc.TUINT8:
		a = x86.AADDB

	case gc.OADD<<16 | gc.TINT16,
		gc.OADD<<16 | gc.TUINT16:
		a = x86.AADDW

	case gc.OADD<<16 | gc.TINT32,
		gc.OADD<<16 | gc.TUINT32,
		gc.OADD<<16 | gc.TPTR32:
		a = x86.AADDL

	case gc.OADD<<16 | gc.TINT64,
		gc.OADD<<16 | gc.TUINT64,
		gc.OADD<<16 | gc.TPTR64:
		a = x86.AADDQ

	case gc.OADD<<16 | gc.TFLOAT32:
		a = x86.AADDSS

	case gc.OADD<<16 | gc.TFLOAT64:
		a = x86.AADDSD

	case gc.OSUB<<16 | gc.TINT8,
		gc.OSUB<<16 | gc.TUINT8:
		a = x86.ASUBB

	case gc.OSUB<<16 | gc.TINT16,
		gc.OSUB<<16 | gc.TUINT16:
		a = x86.ASUBW

	case gc.OSUB<<16 | gc.TINT32,
		gc.OSUB<<16 | gc.TUINT32,
		gc.OSUB<<16 | gc.TPTR32:
		a = x86.ASUBL

	case gc.OSUB<<16 | gc.TINT64,
		gc.OSUB<<16 | gc.TUINT64,
		gc.OSUB<<16 | gc.TPTR64:
		a = x86.ASUBQ

	case gc.OSUB<<16 | gc.TFLOAT32:
		a = x86.ASUBSS

	case gc.OSUB<<16 | gc.TFLOAT64:
		a = x86.ASUBSD

	case gc.OINC<<16 | gc.TINT8,
		gc.OINC<<16 | gc.TUINT8:
		a = x86.AINCB

	case gc.OINC<<16 | gc.TINT16,
		gc.OINC<<16 | gc.TUINT16:
		a = x86.AINCW

	case gc.OINC<<16 | gc.TINT32,
		gc.OINC<<16 | gc.TUINT32,
		gc.OINC<<16 | gc.TPTR32:
		a = x86.AINCL

	case gc.OINC<<16 | gc.TINT64,
		gc.OINC<<16 | gc.TUINT64,
		gc.OINC<<16 | gc.TPTR64:
		a = x86.AINCQ

	case gc.ODEC<<16 | gc.TINT8,
		gc.ODEC<<16 | gc.TUINT8:
		a = x86.ADECB

	case gc.ODEC<<16 | gc.TINT16,
		gc.ODEC<<16 | gc.TUINT16:
		a = x86.ADECW

	case gc.ODEC<<16 | gc.TINT32,
		gc.ODEC<<16 | gc.TUINT32,
		gc.ODEC<<16 | gc.TPTR32:
		a = x86.ADECL

	case gc.ODEC<<16 | gc.TINT64,
		gc.ODEC<<16 | gc.TUINT64,
		gc.ODEC<<16 | gc.TPTR64:
		a = x86.ADECQ

	case gc.OMINUS<<16 | gc.TINT8,
		gc.OMINUS<<16 | gc.TUINT8:
		a = x86.ANEGB

	case gc.OMINUS<<16 | gc.TINT16,
		gc.OMINUS<<16 | gc.TUINT16:
		a = x86.ANEGW

	case gc.OMINUS<<16 | gc.TINT32,
		gc.OMINUS<<16 | gc.TUINT32,
		gc.OMINUS<<16 | gc.TPTR32:
		a = x86.ANEGL

	case gc.OMINUS<<16 | gc.TINT64,
		gc.OMINUS<<16 | gc.TUINT64,
		gc.OMINUS<<16 | gc.TPTR64:
		a = x86.ANEGQ

	case gc.OAND<<16 | gc.TINT8,
		gc.OAND<<16 | gc.TUINT8:
		a = x86.AANDB

	case gc.OAND<<16 | gc.TINT16,
		gc.OAND<<16 | gc.TUINT16:
		a = x86.AANDW

	case gc.OAND<<16 | gc.TINT32,
		gc.OAND<<16 | gc.TUINT32,
		gc.OAND<<16 | gc.TPTR32:
		a = x86.AANDL

	case gc.OAND<<16 | gc.TINT64,
		gc.OAND<<16 | gc.TUINT64,
		gc.OAND<<16 | gc.TPTR64:
		a = x86.AANDQ

	case gc.OOR<<16 | gc.TINT8,
		gc.OOR<<16 | gc.TUINT8:
		a = x86.AORB

	case gc.OOR<<16 | gc.TINT16,
		gc.OOR<<16 | gc.TUINT16:
		a = x86.AORW

	case gc.OOR<<16 | gc.TINT32,
		gc.OOR<<16 | gc.TUINT32,
		gc.OOR<<16 | gc.TPTR32:
		a = x86.AORL

	case gc.OOR<<16 | gc.TINT64,
		gc.OOR<<16 | gc.TUINT64,
		gc.OOR<<16 | gc.TPTR64:
		a = x86.AORQ

	case gc.OXOR<<16 | gc.TINT8,
		gc.OXOR<<16 | gc.TUINT8:
		a = x86.AXORB

	case gc.OXOR<<16 | gc.TINT16,
		gc.OXOR<<16 | gc.TUINT16:
		a = x86.AXORW

	case gc.OXOR<<16 | gc.TINT32,
		gc.OXOR<<16 | gc.TUINT32,
		gc.OXOR<<16 | gc.TPTR32:
		a = x86.AXORL

	case gc.OXOR<<16 | gc.TINT64,
		gc.OXOR<<16 | gc.TUINT64,
		gc.OXOR<<16 | gc.TPTR64:
		a = x86.AXORQ

	case gc.OLROT<<16 | gc.TINT8,
		gc.OLROT<<16 | gc.TUINT8:
		a = x86.AROLB

	case gc.OLROT<<16 | gc.TINT16,
		gc.OLROT<<16 | gc.TUINT16:
		a = x86.AROLW

	case gc.OLROT<<16 | gc.TINT32,
		gc.OLROT<<16 | gc.TUINT32,
		gc.OLROT<<16 | gc.TPTR32:
		a = x86.AROLL

	case gc.OLROT<<16 | gc.TINT64,
		gc.OLROT<<16 | gc.TUINT64,
		gc.OLROT<<16 | gc.TPTR64:
		a = x86.AROLQ

	case gc.OLSH<<16 | gc.TINT8,
		gc.OLSH<<16 | gc.TUINT8:
		a = x86.ASHLB

	case gc.OLSH<<16 | gc.TINT16,
		gc.OLSH<<16 | gc.TUINT16:
		a = x86.ASHLW

	case gc.OLSH<<16 | gc.TINT32,
		gc.OLSH<<16 | gc.TUINT32,
		gc.OLSH<<16 | gc.TPTR32:
		a = x86.ASHLL

	case gc.OLSH<<16 | gc.TINT64,
		gc.OLSH<<16 | gc.TUINT64,
		gc.OLSH<<16 | gc.TPTR64:
		a = x86.ASHLQ

	case gc.ORSH<<16 | gc.TUINT8:
		a = x86.ASHRB

	case gc.ORSH<<16 | gc.TUINT16:
		a = x86.ASHRW

	case gc.ORSH<<16 | gc.TUINT32,
		gc.ORSH<<16 | gc.TPTR32:
		a = x86.ASHRL

	case gc.ORSH<<16 | gc.TUINT64,
		gc.ORSH<<16 | gc.TPTR64:
		a = x86.ASHRQ

	case gc.ORSH<<16 | gc.TINT8:
		a = x86.ASARB

	case gc.ORSH<<16 | gc.TINT16:
		a = x86.ASARW

	case gc.ORSH<<16 | gc.TINT32:
		a = x86.ASARL

	case gc.ORSH<<16 | gc.TINT64:
		a = x86.ASARQ

	case gc.ORROTC<<16 | gc.TINT8,
		gc.ORROTC<<16 | gc.TUINT8:
		a = x86.ARCRB

	case gc.ORROTC<<16 | gc.TINT16,
		gc.ORROTC<<16 | gc.TUINT16:
		a = x86.ARCRW

	case gc.ORROTC<<16 | gc.TINT32,
		gc.ORROTC<<16 | gc.TUINT32:
		a = x86.ARCRL

	case gc.ORROTC<<16 | gc.TINT64,
		gc.ORROTC<<16 | gc.TUINT64:
		a = x86.ARCRQ

	case gc.OHMUL<<16 | gc.TINT8,
		gc.OMUL<<16 | gc.TINT8,
		gc.OMUL<<16 | gc.TUINT8:
		a = x86.AIMULB

	case gc.OHMUL<<16 | gc.TINT16,
		gc.OMUL<<16 | gc.TINT16,
		gc.OMUL<<16 | gc.TUINT16:
		a = x86.AIMULW

	case gc.OHMUL<<16 | gc.TINT32,
		gc.OMUL<<16 | gc.TINT32,
		gc.OMUL<<16 | gc.TUINT32,
		gc.OMUL<<16 | gc.TPTR32:
		a = x86.AIMULL

	case gc.OHMUL<<16 | gc.TINT64,
		gc.OMUL<<16 | gc.TINT64,
		gc.OMUL<<16 | gc.TUINT64,
		gc.OMUL<<16 | gc.TPTR64:
		a = x86.AIMULQ

	case gc.OHMUL<<16 | gc.TUINT8:
		a = x86.AMULB

	case gc.OHMUL<<16 | gc.TUINT16:
		a = x86.AMULW

	case gc.OHMUL<<16 | gc.TUINT32,
		gc.OHMUL<<16 | gc.TPTR32:
		a = x86.AMULL

	case gc.OHMUL<<16 | gc.TUINT64,
		gc.OHMUL<<16 | gc.TPTR64:
		a = x86.AMULQ

	case gc.OMUL<<16 | gc.TFLOAT32:
		a = x86.AMULSS

	case gc.OMUL<<16 | gc.TFLOAT64:
		a = x86.AMULSD

	case gc.ODIV<<16 | gc.TINT8,
		gc.OMOD<<16 | gc.TINT8:
		a = x86.AIDIVB

	case gc.ODIV<<16 | gc.TUINT8,
		gc.OMOD<<16 | gc.TUINT8:
		a = x86.ADIVB

	case gc.ODIV<<16 | gc.TINT16,
		gc.OMOD<<16 | gc.TINT16:
		a = x86.AIDIVW

	case gc.ODIV<<16 | gc.TUINT16,
		gc.OMOD<<16 | gc.TUINT16:
		a = x86.ADIVW

	case gc.ODIV<<16 | gc.TINT32,
		gc.OMOD<<16 | gc.TINT32:
		a = x86.AIDIVL

	case gc.ODIV<<16 | gc.TUINT32,
		gc.ODIV<<16 | gc.TPTR32,
		gc.OMOD<<16 | gc.TUINT32,
		gc.OMOD<<16 | gc.TPTR32:
		a = x86.ADIVL

	case gc.ODIV<<16 | gc.TINT64,
		gc.OMOD<<16 | gc.TINT64:
		a = x86.AIDIVQ

	case gc.ODIV<<16 | gc.TUINT64,
		gc.ODIV<<16 | gc.TPTR64,
		gc.OMOD<<16 | gc.TUINT64,
		gc.OMOD<<16 | gc.TPTR64:
		a = x86.ADIVQ

	case gc.OEXTEND<<16 | gc.TINT16:
		a = x86.ACWD

	case gc.OEXTEND<<16 | gc.TINT32:
		a = x86.ACDQ

	case gc.OEXTEND<<16 | gc.TINT64:
		a = x86.ACQO

	case gc.ODIV<<16 | gc.TFLOAT32:
		a = x86.ADIVSS

	case gc.ODIV<<16 | gc.TFLOAT64:
		a = x86.ADIVSD
	}

	return a
}

const (
	ODynam   = 1 << 0
	OAddable = 1 << 1
)

var clean [20]gc.Node

var cleani int = 0

func xgen(n *gc.Node, a *gc.Node, o int) bool {
	regalloc(a, gc.Types[gc.Tptr], nil)

	if o&ODynam != 0 {
		if n.Addable != 0 {
			if n.Op != gc.OINDREG {
				if n.Op != gc.OREGISTER {
					return true
				}
			}
		}
	}

	agen(n, a)
	return false
}

func sudoclean() {
	if clean[cleani-1].Op != gc.OEMPTY {
		regfree(&clean[cleani-1])
	}
	if clean[cleani-2].Op != gc.OEMPTY {
		regfree(&clean[cleani-2])
	}
	cleani -= 2
}

/*
 * generate code to compute address of n,
 * a reference to a (perhaps nested) field inside
 * an array or struct.
 * return 0 on failure, 1 on success.
 * on success, leaves usable address in a.
 *
 * caller is responsible for calling sudoclean
 * after successful sudoaddable,
 * to release the register used for a.
 */
func sudoaddable(as int, n *gc.Node, a *obj.Addr) bool {
	if n.Type == nil {
		return false
	}

	*a = obj.Addr{}

	switch n.Op {
	case gc.OLITERAL:
		if !gc.Isconst(n, gc.CTINT) {
			break
		}
		v := gc.Mpgetfix(n.Val.U.Xval)
		if v >= 32000 || v <= -32000 {
			break
		}
		switch as {
		default:
			return false

		case x86.AADDB,
			x86.AADDW,
			x86.AADDL,
			x86.AADDQ,
			x86.ASUBB,
			x86.ASUBW,
			x86.ASUBL,
			x86.ASUBQ,
			x86.AANDB,
			x86.AANDW,
			x86.AANDL,
			x86.AANDQ,
			x86.AORB,
			x86.AORW,
			x86.AORL,
			x86.AORQ,
			x86.AXORB,
			x86.AXORW,
			x86.AXORL,
			x86.AXORQ,
			x86.AINCB,
			x86.AINCW,
			x86.AINCL,
			x86.AINCQ,
			x86.ADECB,
			x86.ADECW,
			x86.ADECL,
			x86.ADECQ,
			x86.AMOVB,
			x86.AMOVW,
			x86.AMOVL,
			x86.AMOVQ:
			break
		}

		cleani += 2
		reg := &clean[cleani-1]
		reg1 := &clean[cleani-2]
		reg.Op = gc.OEMPTY
		reg1.Op = gc.OEMPTY
		*a = gc.Naddr(n)
		return true

	case gc.ODOT,
		gc.ODOTPTR:
		cleani += 2
		reg := &clean[cleani-1]
		reg1 := &clean[cleani-2]
		reg.Op = gc.OEMPTY
		reg1.Op = gc.OEMPTY
		var nn *gc.Node
		var oary [10]int64
		o := gc.Dotoffset(n, oary[:], &nn)
		if nn == nil {
			sudoclean()
			return false
		}

		if nn.Addable != 0 && o == 1 && oary[0] >= 0 {
			// directly addressable set of DOTs
			n1 := *nn

			n1.Type = n.Type
			n1.Xoffset += oary[0]
			*a = gc.Naddr(&n1)
			return true
		}

		regalloc(reg, gc.Types[gc.Tptr], nil)
		n1 := *reg
		n1.Op = gc.OINDREG
		if oary[0] >= 0 {
			agen(nn, reg)
			n1.Xoffset = oary[0]
		} else {
			cgen(nn, reg)
			gc.Cgen_checknil(reg)
			n1.Xoffset = -(oary[0] + 1)
		}

		for i := 1; i < o; i++ {
			if oary[i] >= 0 {
				gc.Fatal("can't happen")
			}
			gins(movptr, &n1, reg)
			gc.Cgen_checknil(reg)
			n1.Xoffset = -(oary[i] + 1)
		}

		a.Type = obj.TYPE_NONE
		a.Index = obj.TYPE_NONE
		fixlargeoffset(&n1)
		*a = gc.Naddr(&n1)
		return true

	case gc.OINDEX:
		return false
	}

	return false
}