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Golang gc.Nconv函數代碼示例

本文整理匯總了Golang中cmd/internal/gc.Nconv函數的典型用法代碼示例。如果您正苦於以下問題：Golang Nconv函數的具體用法？Golang Nconv怎麽用？Golang Nconv使用的例子？那麽, 這裏精選的函數代碼示例或許可以為您提供幫助。


在下文中一共展示了Nconv函數的12個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Golang代碼示例。

示例1: defframe

func defframe(ptxt *obj.Prog) {
	var n *gc.Node

	// fill in argument size, stack size
	ptxt.To.Type = obj.TYPE_TEXTSIZE

	ptxt.To.Val = int32(gc.Rnd(gc.Curfn.Type.Argwid, int64(gc.Widthptr)))
	frame := uint32(gc.Rnd(gc.Stksize+gc.Maxarg, int64(gc.Widthreg)))
	ptxt.To.Offset = int64(frame)

	// insert code to zero ambiguously live variables
	// so that the garbage collector only sees initialized values
	// when it looks for pointers.
	p := ptxt

	hi := int64(0)
	lo := hi
	ax := uint32(0)

	// iterate through declarations - they are sorted in decreasing xoffset order.
	for l := gc.Curfn.Func.Dcl; l != nil; l = l.Next {
		n = l.N
		if !n.Needzero {
			continue
		}
		if n.Class != gc.PAUTO {
			gc.Fatal("needzero class %d", n.Class)
		}
		if n.Type.Width%int64(gc.Widthptr) != 0 || n.Xoffset%int64(gc.Widthptr) != 0 || n.Type.Width == 0 {
			gc.Fatal("var %v has size %d offset %d", gc.Nconv(n, obj.FmtLong), int(n.Type.Width), int(n.Xoffset))
		}

		if lo != hi && n.Xoffset+n.Type.Width >= lo-int64(2*gc.Widthreg) {
			// merge with range we already have
			lo = n.Xoffset

			continue
		}

		// zero old range
		p = zerorange(p, int64(frame), lo, hi, &ax)

		// set new range
		hi = n.Xoffset + n.Type.Width

		lo = n.Xoffset
	}

	// zero final range
	zerorange(p, int64(frame), lo, hi, &ax)
}
開發者ID:xslonepiece，項目名稱:goios，代碼行數:51，代碼來源:ggen.go

示例2: fixlargeoffset

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
	}
}
開發者ID:tidatida，項目名稱:go，代碼行數:24，代碼來源:gsubr.go

示例3: floatmove_sse

func floatmove_sse(f *gc.Node, t *gc.Node) {
	var r1 gc.Node
	var cvt *gc.Type
	var a int

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

	switch uint32(ft)<<16 | uint32(tt) {
	// should not happen
	default:
		gc.Fatal("gmove %v -> %v", gc.Nconv(f, 0), gc.Nconv(t, 0))

		return

		// convert via int32.
	/*
	* float to integer
	 */
	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 hardmem

	case gc.TFLOAT32<<16 | gc.TINT32:
		a = x86.ACVTTSS2SL
		goto rdst

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

		// convert via int32 memory
	/*
	 * integer to float
	 */
	case gc.TINT8<<16 | gc.TFLOAT32,
		gc.TINT8<<16 | gc.TFLOAT64,
		gc.TINT16<<16 | gc.TFLOAT32,
		gc.TINT16<<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 memory
	case gc.TUINT32<<16 | gc.TFLOAT32,
		gc.TUINT32<<16 | gc.TFLOAT64:
		cvt = gc.Types[gc.TINT64]

		goto hardmem

	case gc.TINT32<<16 | gc.TFLOAT32:
		a = x86.ACVTSL2SS
		goto rdst

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

		/*
		 * 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 intermediate
hard:
//.........這裏部分代碼省略.........
開發者ID:xslonepiece，項目名稱:goios，代碼行數:101，代碼來源:gsubr.go

示例4: floatmove_387

func floatmove_387(f *gc.Node, t *gc.Node) {
	var r1 gc.Node
	var a int

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

	switch uint32(ft)<<16 | uint32(tt) {
	default:
		goto fatal

		/*
		* float to integer
		 */
	case gc.TFLOAT32<<16 | gc.TINT16,
		gc.TFLOAT32<<16 | gc.TINT32,
		gc.TFLOAT32<<16 | gc.TINT64,
		gc.TFLOAT64<<16 | gc.TINT16,
		gc.TFLOAT64<<16 | gc.TINT32,
		gc.TFLOAT64<<16 | gc.TINT64:
		if t.Op == gc.OREGISTER {
			goto hardmem
		}
		var r1 gc.Node
		gc.Nodreg(&r1, gc.Types[ft], x86.REG_F0)
		if f.Op != gc.OREGISTER {
			if ft == gc.TFLOAT32 {
				gins(x86.AFMOVF, f, &r1)
			} else {
				gins(x86.AFMOVD, f, &r1)
			}
		}

		// set round to zero mode during conversion
		var t1 gc.Node
		memname(&t1, gc.Types[gc.TUINT16])

		var t2 gc.Node
		memname(&t2, gc.Types[gc.TUINT16])
		gins(x86.AFSTCW, nil, &t1)
		gins(x86.AMOVW, ncon(0xf7f), &t2)
		gins(x86.AFLDCW, &t2, nil)
		if tt == gc.TINT16 {
			gins(x86.AFMOVWP, &r1, t)
		} else if tt == gc.TINT32 {
			gins(x86.AFMOVLP, &r1, t)
		} else {
			gins(x86.AFMOVVP, &r1, t)
		}
		gins(x86.AFLDCW, &t1, nil)
		return

		// convert via int32.
	case gc.TFLOAT32<<16 | gc.TINT8,
		gc.TFLOAT32<<16 | gc.TUINT16,
		gc.TFLOAT32<<16 | gc.TUINT8,
		gc.TFLOAT64<<16 | gc.TINT8,
		gc.TFLOAT64<<16 | gc.TUINT16,
		gc.TFLOAT64<<16 | gc.TUINT8:
		var t1 gc.Node
		gc.Tempname(&t1, gc.Types[gc.TINT32])

		gmove(f, &t1)
		switch tt {
		default:
			gc.Fatal("gmove %v", gc.Nconv(t, 0))

		case gc.TINT8:
			gins(x86.ACMPL, &t1, ncon(-0x80&(1<<32-1)))
			p1 := gc.Gbranch(optoas(gc.OLT, gc.Types[gc.TINT32]), nil, -1)
			gins(x86.ACMPL, &t1, ncon(0x7f))
			p2 := gc.Gbranch(optoas(gc.OGT, gc.Types[gc.TINT32]), nil, -1)
			p3 := gc.Gbranch(obj.AJMP, nil, 0)
			gc.Patch(p1, gc.Pc)
			gc.Patch(p2, gc.Pc)
			gmove(ncon(-0x80&(1<<32-1)), &t1)
			gc.Patch(p3, gc.Pc)
			gmove(&t1, t)

		case gc.TUINT8:
			gins(x86.ATESTL, ncon(0xffffff00), &t1)
			p1 := gc.Gbranch(x86.AJEQ, nil, +1)
			gins(x86.AMOVL, ncon(0), &t1)
			gc.Patch(p1, gc.Pc)
			gmove(&t1, t)

		case gc.TUINT16:
			gins(x86.ATESTL, ncon(0xffff0000), &t1)
			p1 := gc.Gbranch(x86.AJEQ, nil, +1)
			gins(x86.AMOVL, ncon(0), &t1)
			gc.Patch(p1, gc.Pc)
			gmove(&t1, t)
		}

		return

		// convert via int64.
	case gc.TFLOAT32<<16 | gc.TUINT32,
		gc.TFLOAT64<<16 | gc.TUINT32:
//.........這裏部分代碼省略.........
開發者ID:xslonepiece，項目名稱:goios，代碼行數:101，代碼來源:gsubr.go

示例5: agen

/*
 * generate:
 *	res = &n;
 * The generated code checks that the result is not nil.
 */
func agen(n *gc.Node, res *gc.Node) {
	if gc.Debug['g'] != 0 {
		gc.Dump("\nagen-res", res)
		gc.Dump("agen-r", n)
	}

	if n == nil || n.Type == nil {
		return
	}

	for n.Op == gc.OCONVNOP {
		n = n.Left
	}

	if gc.Isconst(n, gc.CTNIL) && n.Type.Width > int64(gc.Widthptr) {
		// Use of a nil interface or nil slice.
		// Create a temporary we can take the address of and read.
		// The generated code is just going to panic, so it need not
		// be terribly efficient. See issue 3670.
		var n1 gc.Node
		gc.Tempname(&n1, n.Type)

		gc.Gvardef(&n1)
		clearfat(&n1)
		var n2 gc.Node
		regalloc(&n2, gc.Types[gc.Tptr], res)
		var n3 gc.Node
		n3.Op = gc.OADDR
		n3.Left = &n1
		gins(ppc64.AMOVD, &n3, &n2)
		gmove(&n2, res)
		regfree(&n2)
		return
	}

	if n.Addable != 0 {
		var n1 gc.Node
		n1.Op = gc.OADDR
		n1.Left = n
		var n2 gc.Node
		regalloc(&n2, gc.Types[gc.Tptr], res)
		gins(ppc64.AMOVD, &n1, &n2)
		gmove(&n2, res)
		regfree(&n2)
		return
	}

	nl := n.Left

	switch n.Op {
	default:
		gc.Fatal("agen: unknown op %v", gc.Nconv(n, obj.FmtShort|obj.FmtSign))

		// TODO(minux): 5g has this: Release res so that it is available for cgen_call.
	// Pick it up again after the call for OCALLMETH and OCALLFUNC.
	case gc.OCALLMETH:
		gc.Cgen_callmeth(n, 0)

		cgen_aret(n, res)

	case gc.OCALLINTER:
		cgen_callinter(n, res, 0)
		cgen_aret(n, res)

	case gc.OCALLFUNC:
		cgen_call(n, 0)
		cgen_aret(n, res)

	case gc.OSLICE,
		gc.OSLICEARR,
		gc.OSLICESTR,
		gc.OSLICE3,
		gc.OSLICE3ARR:
		var n1 gc.Node
		gc.Tempname(&n1, n.Type)
		gc.Cgen_slice(n, &n1)
		agen(&n1, res)

	case gc.OEFACE:
		var n1 gc.Node
		gc.Tempname(&n1, n.Type)
		gc.Cgen_eface(n, &n1)
		agen(&n1, res)

	case gc.OINDEX:
		var n1 gc.Node
		agenr(n, &n1, res)
		gmove(&n1, res)
		regfree(&n1)

		// should only get here with names in this func.
	case gc.ONAME:
		if n.Funcdepth > 0 && n.Funcdepth != gc.Funcdepth {
			gc.Dump("bad agen", n)
			gc.Fatal("agen: bad ONAME funcdepth %d != %d", n.Funcdepth, gc.Funcdepth)
//.........這裏部分代碼省略.........
開發者ID:klueska，項目名稱:go-akaros，代碼行數:101，代碼來源:cgen.go

示例6: cgen


//.........這裏部分代碼省略.........
			return
		}
	}

	if !gc.Iscomplex[n.Type.Etype] {
		a := optoas(gc.OAS, n.Type)
		var addr obj.Addr
		if sudoaddable(a, n, &addr) {
			if res.Op == gc.OREGISTER {
				p1 := gins(a, nil, res)
				p1.From = addr
			} else {
				var n2 gc.Node
				regalloc(&n2, n.Type, nil)
				p1 := gins(a, nil, &n2)
				p1.From = addr
				gins(a, &n2, res)
				regfree(&n2)
			}

			sudoclean()
			return
		}
	}

	// TODO(minux): we shouldn't reverse FP comparisons, but then we need to synthesize
	// OGE, OLE, and ONE ourselves.
	// if(nl != N && isfloat[n->type->etype] && isfloat[nl->type->etype]) goto flt;

	var a int
	switch n.Op {
	default:
		gc.Dump("cgen", n)
		gc.Fatal("cgen: unknown op %v", gc.Nconv(n, obj.FmtShort|obj.FmtSign))

		// these call bgen to get a bool value
	case gc.OOROR,
		gc.OANDAND,
		gc.OEQ,
		gc.ONE,
		gc.OLT,
		gc.OLE,
		gc.OGE,
		gc.OGT,
		gc.ONOT:
		p1 := gc.Gbranch(ppc64.ABR, nil, 0)

		p2 := gc.Pc
		gmove(gc.Nodbool(true), res)
		p3 := gc.Gbranch(ppc64.ABR, nil, 0)
		gc.Patch(p1, gc.Pc)
		bgen(n, true, 0, p2)
		gmove(gc.Nodbool(false), res)
		gc.Patch(p3, gc.Pc)
		return

	case gc.OPLUS:
		cgen(nl, res)
		return

		// unary
	case gc.OCOM:
		a := optoas(gc.OXOR, nl.Type)

		var n1 gc.Node
		regalloc(&n1, nl.Type, nil)
開發者ID:klueska，項目名稱:go-akaros，代碼行數:67，代碼來源:cgen.go

示例7: gmove

/*
 * 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
			gc.Regalloc(&r1, con.Type, t)
			gins(arm64.AMOVD, &con, &r1)
			gmove(&r1, t)
			gc.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
			gc.Regalloc(&r1, con.Type, t)
			gins(arm64.AMOVD, &con, &r1)
			gmove(&r1, t)
			gc.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

//.........這裏部分代碼省略.........
開發者ID:tidatida，項目名稱:go，代碼行數:101，代碼來源:gsubr.go

示例8: anyregalloc


//.........這裏部分代碼省略.........
 */
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)
開發者ID:klueska，項目名稱:go-akaros，代碼行數:67，代碼來源:gsubr.go

示例9: gmove

/*
 * 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
		f.Convconst(&con, t.Type)
		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 i := con.Int(); int64(int32(i)) != i {
					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,
//.........這裏部分代碼省略.........
開發者ID:bibbyflyaway，項目名稱:go，代碼行數:101，代碼來源:gsubr.go

示例10: cgen64


//.........這裏部分代碼省略.........
		gc.OLSH,
		gc.ORSH,
		gc.OAND,
		gc.OOR,
		gc.OXOR,
		gc.OLROT:
		break
	}

	// setup for binary operators
	r := n.Right

	if r != nil && r.Addable == 0 {
		var t2 gc.Node
		gc.Tempname(&t2, r.Type)
		gc.Cgen(r, &t2)
		r = &t2
	}

	var hi2 gc.Node
	var lo2 gc.Node
	if gc.Is64(r.Type) {
		split64(r, &lo2, &hi2)
	}

	var al gc.Node
	gc.Regalloc(&al, lo1.Type, nil)
	var ah gc.Node
	gc.Regalloc(&ah, hi1.Type, nil)

	// Do op.  Leave result in ah:al.
	switch n.Op {
	default:
		gc.Fatal("cgen64: not implemented: %v\n", gc.Nconv(n, 0))

		// TODO: Constants
	case gc.OADD:
		var bl gc.Node
		gc.Regalloc(&bl, gc.Types[gc.TPTR32], nil)

		var bh gc.Node
		gc.Regalloc(&bh, gc.Types[gc.TPTR32], nil)
		gins(arm.AMOVW, &hi1, &ah)
		gins(arm.AMOVW, &lo1, &al)
		gins(arm.AMOVW, &hi2, &bh)
		gins(arm.AMOVW, &lo2, &bl)
		p1 := gins(arm.AADD, &bl, &al)
		p1.Scond |= arm.C_SBIT
		gins(arm.AADC, &bh, &ah)
		gc.Regfree(&bl)
		gc.Regfree(&bh)

		// TODO: Constants.
	case gc.OSUB:
		var bl gc.Node
		gc.Regalloc(&bl, gc.Types[gc.TPTR32], nil)

		var bh gc.Node
		gc.Regalloc(&bh, gc.Types[gc.TPTR32], nil)
		gins(arm.AMOVW, &lo1, &al)
		gins(arm.AMOVW, &hi1, &ah)
		gins(arm.AMOVW, &lo2, &bl)
		gins(arm.AMOVW, &hi2, &bh)
		p1 := gins(arm.ASUB, &bl, &al)
		p1.Scond |= arm.C_SBIT
		gins(arm.ASBC, &bh, &ah)
開發者ID:tidatida，項目名稱:go，代碼行數:67，代碼來源:cgen64.go

示例11: gmove

func gmove(f *gc.Node, t *gc.Node) {
	if gc.Debug['M'] != 0 {
		fmt.Printf("gmove %v -> %v\n", gc.Nconv(f, 0), gc.Nconv(t, 0))
	}

	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
	}

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

	// cannot have two integer memory operands;
	// except 64-bit, which always copies via registers anyway.
	var r1 gc.Node
	var a int
	if gc.Isint[ft] && gc.Isint[tt] && !gc.Is64(f.Type) && !gc.Is64(t.Type) && 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 = gc.Simsimtype(con.Type)
	}

	// 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:
		// should not happen
		gc.Fatal("gmove %v -> %v", gc.Nconv(f, 0), gc.Nconv(t, 0))
		return

		/*
		 * 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:
		a = x86.AMOVB

	case gc.TINT16<<16 | gc.TINT8, // truncate
		gc.TUINT16<<16 | gc.TINT8,
		gc.TINT32<<16 | gc.TINT8,
		gc.TUINT32<<16 | gc.TINT8,
		gc.TINT16<<16 | gc.TUINT8,
		gc.TUINT16<<16 | gc.TUINT8,
		gc.TINT32<<16 | gc.TUINT8,
		gc.TUINT32<<16 | gc.TUINT8:
		a = x86.AMOVB

		goto rsrc

	case gc.TINT64<<16 | gc.TINT8, // truncate low word
		gc.TUINT64<<16 | gc.TINT8,
		gc.TINT64<<16 | gc.TUINT8,
		gc.TUINT64<<16 | gc.TUINT8:
		var flo gc.Node
		var fhi gc.Node
		split64(f, &flo, &fhi)

		var r1 gc.Node
		gc.Nodreg(&r1, t.Type, x86.REG_AX)
		gmove(&flo, &r1)
		gins(x86.AMOVB, &r1, t)
		splitclean()
		return

	case gc.TINT16<<16 | gc.TINT16, // same size
		gc.TINT16<<16 | gc.TUINT16,
		gc.TUINT16<<16 | gc.TINT16,
		gc.TUINT16<<16 | gc.TUINT16:
		a = x86.AMOVW

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

		goto rsrc

	case gc.TINT64<<16 | gc.TINT16, // truncate low word
		gc.TUINT64<<16 | gc.TINT16,
//.........這裏部分代碼省略.........
開發者ID:xslonepiece，項目名稱:goios，代碼行數:101，代碼來源:gsubr.go

示例12: clearfat

func clearfat(nl *gc.Node) {
	/* clear a fat object */
	if gc.Debug['g'] != 0 {
		fmt.Printf("clearfat %v (%v, size: %d)\n", gc.Nconv(nl, 0), gc.Tconv(nl.Type, 0), nl.Type.Width)
	}

	w := uint64(uint64(nl.Type.Width))

	// Avoid taking the address for simple enough types.
	if gc.Componentgen(nil, nl) {
		return
	}

	c := uint64(w % 8) // bytes
	q := uint64(w / 8) // dwords

	if gc.Reginuse(ppc64.REGRT1) {
		gc.Fatal("%v in use during clearfat", obj.Rconv(ppc64.REGRT1))
	}

	var r0 gc.Node
	gc.Nodreg(&r0, gc.Types[gc.TUINT64], ppc64.REGZERO)
	var dst gc.Node
	gc.Nodreg(&dst, gc.Types[gc.Tptr], ppc64.REGRT1)
	gc.Regrealloc(&dst)
	gc.Agen(nl, &dst)

	var boff uint64
	if q > 128 {
		p := gins(ppc64.ASUB, nil, &dst)
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = 8

		var end gc.Node
		gc.Regalloc(&end, gc.Types[gc.Tptr], nil)
		p = gins(ppc64.AMOVD, &dst, &end)
		p.From.Type = obj.TYPE_ADDR
		p.From.Offset = int64(q * 8)

		p = gins(ppc64.AMOVDU, &r0, &dst)
		p.To.Type = obj.TYPE_MEM
		p.To.Offset = 8
		pl := (*obj.Prog)(p)

		p = gins(ppc64.ACMP, &dst, &end)
		gc.Patch(gc.Gbranch(ppc64.ABNE, nil, 0), pl)

		gc.Regfree(&end)

		// The loop leaves R3 on the last zeroed dword
		boff = 8
	} else if q >= 4 {
		p := gins(ppc64.ASUB, nil, &dst)
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = 8
		f := (*gc.Node)(gc.Sysfunc("duffzero"))
		p = gins(obj.ADUFFZERO, nil, f)
		gc.Afunclit(&p.To, f)

		// 4 and 128 = magic constants: see ../../runtime/asm_ppc64x.s
		p.To.Offset = int64(4 * (128 - q))

		// duffzero leaves R3 on the last zeroed dword
		boff = 8
	} else {
		var p *obj.Prog
		for t := uint64(0); t < q; t++ {
			p = gins(ppc64.AMOVD, &r0, &dst)
			p.To.Type = obj.TYPE_MEM
			p.To.Offset = int64(8 * t)
		}

		boff = 8 * q
	}

	var p *obj.Prog
	for t := uint64(0); t < c; t++ {
		p = gins(ppc64.AMOVB, &r0, &dst)
		p.To.Type = obj.TYPE_MEM
		p.To.Offset = int64(t + boff)
	}

	gc.Regfree(&dst)
}
開發者ID:tidatida，項目名稱:go，代碼行數:84，代碼來源:ggen.go


注：本文中的cmd/internal/gc.Nconv函數示例由純淨天空整理自Github/MSDocs等開源代碼及文檔管理平台，相關代碼片段篩選自各路編程大神貢獻的開源項目，源碼版權歸原作者所有，傳播和使用請參考對應項目的License；未經允許，請勿轉載。