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Golang Node.Xoffset方法代碼示例

本文整理匯總了Golang中cmd/compile/internal/gc.Node.Xoffset方法的典型用法代碼示例。如果您正苦於以下問題：Golang Node.Xoffset方法的具體用法？Golang Node.Xoffset怎麽用？Golang Node.Xoffset使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類cmd/compile/internal/gc.Node的用法示例。


在下文中一共展示了Node.Xoffset方法的8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: split64

/*
 * n is a 64-bit value.  fill in lo and hi to refer to its 32-bit halves.
 */
func split64(n *gc.Node, lo *gc.Node, hi *gc.Node) {
	if !gc.Is64(n.Type) {
		gc.Fatalf("split64 %v", n.Type)
	}

	if nsclean >= len(sclean) {
		gc.Fatalf("split64 clean")
	}
	sclean[nsclean].Op = gc.OEMPTY
	nsclean++
	switch n.Op {
	default:
		switch n.Op {
		default:
			var n1 gc.Node
			if !dotaddable(n, &n1) {
				gc.Igen(n, &n1, nil)
				sclean[nsclean-1] = n1
			}

			n = &n1

		case gc.ONAME:
			if n.Class == gc.PPARAMREF {
				var n1 gc.Node
				gc.Cgen(n.Name.Heapaddr, &n1)
				sclean[nsclean-1] = n1
				n = &n1
			}

			// nothing
		case gc.OINDREG:
			break
		}

		*lo = *n
		*hi = *n
		lo.Type = gc.Types[gc.TUINT32]
		if n.Type.Etype == gc.TINT64 {
			hi.Type = gc.Types[gc.TINT32]
		} else {
			hi.Type = gc.Types[gc.TUINT32]
		}
		hi.Xoffset += 4

	case gc.OLITERAL:
		var n1 gc.Node
		n.Convconst(&n1, n.Type)
		i := n1.Int()
		gc.Nodconst(lo, gc.Types[gc.TUINT32], int64(uint32(i)))
		i >>= 32
		if n.Type.Etype == gc.TINT64 {
			gc.Nodconst(hi, gc.Types[gc.TINT32], int64(int32(i)))
		} else {
			gc.Nodconst(hi, gc.Types[gc.TUINT32], int64(uint32(i)))
		}
	}
}
開發者ID:sreis，項目名稱:go，代碼行數:61，代碼來源:gsubr.go

示例2: dotaddable

func dotaddable(n *gc.Node, n1 *gc.Node) bool {
	if n.Op != gc.ODOT {
		return false
	}

	var oary [10]int64
	var nn *gc.Node
	o := gc.Dotoffset(n, oary[:], &nn)
	if nn != nil && nn.Addable && o == 1 && oary[0] >= 0 {
		*n1 = *nn
		n1.Type = n.Type
		n1.Xoffset += oary[0]
		return true
	}

	return false
}
開發者ID:sreis，項目名稱:go，代碼行數:17，代碼來源:gsubr.go

示例3: clearfat

func clearfat(nl *gc.Node) {
	/* clear a fat object */
	if gc.Debug['g'] != 0 {
		gc.Dump("\nclearfat", nl)
	}

	w := nl.Type.Width

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

	c := w % 8 // bytes
	q := w / 8 // quads

	if q < 4 {
		// Write sequence of MOV 0, off(base) instead of using STOSQ.
		// The hope is that although the code will be slightly longer,
		// the MOVs will have no dependencies and pipeline better
		// than the unrolled STOSQ loop.
		// NOTE: Must use agen, not igen, so that optimizer sees address
		// being taken. We are not writing on field boundaries.
		var n1 gc.Node
		gc.Agenr(nl, &n1, nil)

		n1.Op = gc.OINDREG
		var z gc.Node
		gc.Nodconst(&z, gc.Types[gc.TUINT64], 0)
		for {
			tmp14 := q
			q--
			if tmp14 <= 0 {
				break
			}
			n1.Type = z.Type
			gins(x86.AMOVQ, &z, &n1)
			n1.Xoffset += 8
		}

		if c >= 4 {
			gc.Nodconst(&z, gc.Types[gc.TUINT32], 0)
			n1.Type = z.Type
			gins(x86.AMOVL, &z, &n1)
			n1.Xoffset += 4
			c -= 4
		}

		gc.Nodconst(&z, gc.Types[gc.TUINT8], 0)
		for {
			tmp15 := c
			c--
			if tmp15 <= 0 {
				break
			}
			n1.Type = z.Type
			gins(x86.AMOVB, &z, &n1)
			n1.Xoffset++
		}

		gc.Regfree(&n1)
		return
	}

	var oldn1 gc.Node
	var n1 gc.Node
	savex(x86.REG_DI, &n1, &oldn1, nil, gc.Types[gc.Tptr])
	gc.Agen(nl, &n1)

	var ax gc.Node
	var oldax gc.Node
	savex(x86.REG_AX, &ax, &oldax, nil, gc.Types[gc.Tptr])
	gconreg(x86.AMOVL, 0, x86.REG_AX)

	if q > 128 || gc.Nacl {
		gconreg(movptr, q, x86.REG_CX)
		gins(x86.AREP, nil, nil)   // repeat
		gins(x86.ASTOSQ, nil, nil) // STOQ AL,*(DI)+
	} else {
		if di := dzDI(q); di != 0 {
			gconreg(addptr, di, x86.REG_DI)
		}
		p := gins(obj.ADUFFZERO, nil, nil)
		p.To.Type = obj.TYPE_ADDR
		p.To.Sym = gc.Linksym(gc.Pkglookup("duffzero", gc.Runtimepkg))
		p.To.Offset = dzOff(q)
	}

	z := ax
	di := n1
	if w >= 8 && c >= 4 {
		di.Op = gc.OINDREG
		z.Type = gc.Types[gc.TINT64]
		di.Type = z.Type
		p := gins(x86.AMOVQ, &z, &di)
		p.To.Scale = 1
		p.To.Offset = c - 8
	} else if c >= 4 {
		di.Op = gc.OINDREG
		z.Type = gc.Types[gc.TINT32]
//.........這裏部分代碼省略.........
開發者ID:rentongzhang，項目名稱:go，代碼行數:101，代碼來源:ggen.go

示例4: clearfat

func clearfat(nl *gc.Node) {
	/* clear a fat object */
	if gc.Debug['g'] != 0 {
		gc.Dump("\nclearfat", nl)
	}

	w := uint32(nl.Type.Width)

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

	c := w % 4 // bytes
	q := w / 4 // quads

	if q < 4 {
		// Write sequence of MOV 0, off(base) instead of using STOSL.
		// The hope is that although the code will be slightly longer,
		// the MOVs will have no dependencies and pipeline better
		// than the unrolled STOSL loop.
		// NOTE: Must use agen, not igen, so that optimizer sees address
		// being taken. We are not writing on field boundaries.
		var n1 gc.Node
		gc.Regalloc(&n1, gc.Types[gc.Tptr], nil)

		gc.Agen(nl, &n1)
		n1.Op = gc.OINDREG
		var z gc.Node
		gc.Nodconst(&z, gc.Types[gc.TUINT64], 0)
		for ; q > 0; q-- {
			n1.Type = z.Type
			gins(x86.AMOVL, &z, &n1)
			n1.Xoffset += 4
		}

		gc.Nodconst(&z, gc.Types[gc.TUINT8], 0)
		for ; c > 0; c-- {
			n1.Type = z.Type
			gins(x86.AMOVB, &z, &n1)
			n1.Xoffset++
		}

		gc.Regfree(&n1)
		return
	}

	var n1 gc.Node
	gc.Nodreg(&n1, gc.Types[gc.Tptr], x86.REG_DI)
	gc.Agen(nl, &n1)
	gconreg(x86.AMOVL, 0, x86.REG_AX)

	if q > 128 || (q >= 4 && gc.Nacl) {
		gconreg(x86.AMOVL, int64(q), x86.REG_CX)
		gins(x86.AREP, nil, nil)   // repeat
		gins(x86.ASTOSL, nil, nil) // STOL AL,*(DI)+
	} else if q >= 4 {
		p := gins(obj.ADUFFZERO, nil, nil)
		p.To.Type = obj.TYPE_ADDR
		p.To.Sym = gc.Linksym(gc.Pkglookup("duffzero", gc.Runtimepkg))

		// 1 and 128 = magic constants: see ../../runtime/asm_386.s
		p.To.Offset = 1 * (128 - int64(q))
	} else {
		for q > 0 {
			gins(x86.ASTOSL, nil, nil) // STOL AL,*(DI)+
			q--
		}
	}

	for c > 0 {
		gins(x86.ASTOSB, nil, nil) // STOB AL,*(DI)+
		c--
	}
}
開發者ID:Samurais，項目名稱:go，代碼行數:75，代碼來源:ggen.go

示例5: blockcopy


//.........這裏部分代碼省略.........
			gins(x86.AMOVSB, nil, nil) // MOVB *(SI)-,*(DI)-
		}

		if q > 0 {
			if c > 0 {
				gconreg(addptr, -7, x86.REG_SI)
				gconreg(addptr, -7, x86.REG_DI)
			} else {
				gconreg(addptr, w-8, x86.REG_SI)
				gconreg(addptr, w-8, x86.REG_DI)
			}

			gconreg(movptr, q, x86.REG_CX)
			gins(x86.AREP, nil, nil)   // repeat
			gins(x86.AMOVSQ, nil, nil) // MOVQ *(SI)-,*(DI)-
		}

		// we leave with the flag clear
		gins(x86.ACLD, nil, nil)
	} else {
		// normal direction
		if q > 128 || (gc.Nacl && q >= 4) {
			gconreg(movptr, q, x86.REG_CX)
			gins(x86.AREP, nil, nil)   // repeat
			gins(x86.AMOVSQ, nil, nil) // MOVQ *(SI)+,*(DI)+
		} else if q >= 4 {
			var oldx0 gc.Node
			var x0 gc.Node
			savex(x86.REG_X0, &x0, &oldx0, nil, gc.Types[gc.TFLOAT64])

			p := gins(obj.ADUFFCOPY, nil, nil)
			p.To.Type = obj.TYPE_ADDR
			p.To.Sym = gc.Linksym(gc.Pkglookup("duffcopy", gc.Runtimepkg))

			// 64 blocks taking 14 bytes each
			// see ../../../../runtime/mkduff.go
			p.To.Offset = 14 * (64 - q/2)
			restx(&x0, &oldx0)

			if q%2 != 0 {
				gins(x86.AMOVSQ, nil, nil) // MOVQ *(SI)+,*(DI)+
			}
		} else if !gc.Nacl && c == 0 {
			// We don't need the MOVSQ side-effect of updating SI and DI,
			// and issuing a sequence of MOVQs directly is faster.
			nodsi.Op = gc.OINDREG

			noddi.Op = gc.OINDREG
			for q > 0 {
				gmove(&nodsi, &cx) // MOVQ x+(SI),CX
				gmove(&cx, &noddi) // MOVQ CX,x+(DI)
				nodsi.Xoffset += 8
				noddi.Xoffset += 8
				q--
			}
		} else {
			for q > 0 {
				gins(x86.AMOVSQ, nil, nil) // MOVQ *(SI)+,*(DI)+
				q--
			}
		}

		// copy the remaining c bytes
		if w < 4 || c <= 1 || (odst < osrc && osrc < odst+w) {
			for c > 0 {
				gins(x86.AMOVSB, nil, nil) // MOVB *(SI)+,*(DI)+
				c--
			}
		} else if w < 8 || c <= 4 {
			nodsi.Op = gc.OINDREG
			noddi.Op = gc.OINDREG
			cx.Type = gc.Types[gc.TINT32]
			nodsi.Type = gc.Types[gc.TINT32]
			noddi.Type = gc.Types[gc.TINT32]
			if c > 4 {
				nodsi.Xoffset = 0
				noddi.Xoffset = 0
				gmove(&nodsi, &cx)
				gmove(&cx, &noddi)
			}

			nodsi.Xoffset = c - 4
			noddi.Xoffset = c - 4
			gmove(&nodsi, &cx)
			gmove(&cx, &noddi)
		} else {
			nodsi.Op = gc.OINDREG
			noddi.Op = gc.OINDREG
			cx.Type = gc.Types[gc.TINT64]
			nodsi.Type = gc.Types[gc.TINT64]
			noddi.Type = gc.Types[gc.TINT64]
			nodsi.Xoffset = c - 8
			noddi.Xoffset = c - 8
			gmove(&nodsi, &cx)
			gmove(&cx, &noddi)
		}
	}

	restx(&cx, &oldcx)
}
開發者ID:GeorgiCodes，項目名稱:go，代碼行數:101，代碼來源:cgen.go

示例6: clearfat_tail

func clearfat_tail(n1 *gc.Node, b int64) {
	if b >= 16 && isPlan9 {
		var z gc.Node
		gc.Nodconst(&z, gc.Types[gc.TUINT64], 0)
		q := b / 8
		for ; q > 0; q-- {
			n1.Type = z.Type
			gins(x86.AMOVQ, &z, n1)
			n1.Xoffset += 8
			b -= 8
		}
		if b != 0 {
			n1.Xoffset -= 8 - b
			gins(x86.AMOVQ, &z, n1)
		}
		return
	}
	if b >= 16 {
		var vec_zero gc.Node
		gc.Regalloc(&vec_zero, gc.Types[gc.TFLOAT64], nil)
		gins(x86.AXORPS, &vec_zero, &vec_zero)

		for b >= 16 {
			gins(x86.AMOVUPS, &vec_zero, n1)
			n1.Xoffset += 16
			b -= 16
		}

		// MOVUPS X0, off(base) is a few bytes shorter than MOV 0, off(base)
		if b != 0 {
			n1.Xoffset -= 16 - b
			gins(x86.AMOVUPS, &vec_zero, n1)
		}

		gc.Regfree(&vec_zero)
		return
	}

	// Write sequence of MOV 0, off(base) instead of using STOSQ.
	// The hope is that although the code will be slightly longer,
	// the MOVs will have no dependencies and pipeline better
	// than the unrolled STOSQ loop.
	var z gc.Node
	gc.Nodconst(&z, gc.Types[gc.TUINT64], 0)
	if b >= 8 {
		n1.Type = z.Type
		gins(x86.AMOVQ, &z, n1)
		n1.Xoffset += 8
		b -= 8

		if b != 0 {
			n1.Xoffset -= 8 - b
			gins(x86.AMOVQ, &z, n1)
		}
		return
	}

	if b >= 4 {
		gc.Nodconst(&z, gc.Types[gc.TUINT32], 0)
		n1.Type = z.Type
		gins(x86.AMOVL, &z, n1)
		n1.Xoffset += 4
		b -= 4

		if b != 0 {
			n1.Xoffset -= 4 - b
			gins(x86.AMOVL, &z, n1)
		}
		return
	}

	if b >= 2 {
		gc.Nodconst(&z, gc.Types[gc.TUINT16], 0)
		n1.Type = z.Type
		gins(x86.AMOVW, &z, n1)
		n1.Xoffset += 2
		b -= 2
	}

	gc.Nodconst(&z, gc.Types[gc.TUINT8], 0)
	for b > 0 {
		n1.Type = z.Type
		gins(x86.AMOVB, &z, n1)
		n1.Xoffset++
		b--
	}

}
開發者ID:duhaibo0404，項目名稱:go-1，代碼行數:88，代碼來源:ggen.go

示例7: clearfat

func clearfat(nl *gc.Node) {
	/* clear a fat object */
	if gc.Debug['g'] != 0 {
		gc.Dump("\nclearfat", nl)
	}

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

	w := nl.Type.Width

	if w > 1024 || (w >= 64 && (gc.Nacl || isPlan9)) {
		var oldn1 gc.Node
		var n1 gc.Node
		savex(x86.REG_DI, &n1, &oldn1, nil, gc.Types[gc.Tptr])
		gc.Agen(nl, &n1)

		var ax gc.Node
		var oldax gc.Node
		savex(x86.REG_AX, &ax, &oldax, nil, gc.Types[gc.Tptr])
		gconreg(x86.AMOVL, 0, x86.REG_AX)
		gconreg(movptr, w/8, x86.REG_CX)

		gins(x86.AREP, nil, nil)   // repeat
		gins(x86.ASTOSQ, nil, nil) // STOQ AL,*(DI)+

		if w%8 != 0 {
			n1.Op = gc.OINDREG
			clearfat_tail(&n1, w%8)
		}

		restx(&n1, &oldn1)
		restx(&ax, &oldax)
		return
	}

	if w >= 64 {
		var oldn1 gc.Node
		var n1 gc.Node
		savex(x86.REG_DI, &n1, &oldn1, nil, gc.Types[gc.Tptr])
		gc.Agen(nl, &n1)

		var vec_zero gc.Node
		var old_x0 gc.Node
		savex(x86.REG_X0, &vec_zero, &old_x0, nil, gc.Types[gc.TFLOAT64])
		gins(x86.AXORPS, &vec_zero, &vec_zero)

		if di := dzDI(w); di != 0 {
			gconreg(addptr, di, x86.REG_DI)
		}
		p := gins(obj.ADUFFZERO, nil, nil)
		p.To.Type = obj.TYPE_ADDR
		p.To.Sym = gc.Linksym(gc.Pkglookup("duffzero", gc.Runtimepkg))
		p.To.Offset = dzOff(w)

		if w%16 != 0 {
			n1.Op = gc.OINDREG
			n1.Xoffset -= 16 - w%16
			gins(x86.AMOVUPS, &vec_zero, &n1)
		}

		restx(&vec_zero, &old_x0)
		restx(&n1, &oldn1)
		return
	}

	// NOTE: Must use agen, not igen, so that optimizer sees address
	// being taken. We are not writing on field boundaries.
	var n1 gc.Node
	gc.Agenr(nl, &n1, nil)
	n1.Op = gc.OINDREG

	clearfat_tail(&n1, w)

	gc.Regfree(&n1)
}
開發者ID:duhaibo0404，項目名稱:go-1，代碼行數:78，代碼來源:ggen.go

示例8: blockcopy

func blockcopy(n, res *gc.Node, osrc, odst, w int64) {
	var dst gc.Node
	gc.Nodreg(&dst, gc.Types[gc.Tptr], x86.REG_DI)
	var src gc.Node
	gc.Nodreg(&src, gc.Types[gc.Tptr], x86.REG_SI)

	var tsrc gc.Node
	gc.Tempname(&tsrc, gc.Types[gc.Tptr])
	var tdst gc.Node
	gc.Tempname(&tdst, gc.Types[gc.Tptr])
	if !n.Addable {
		gc.Agen(n, &tsrc)
	}
	if !res.Addable {
		gc.Agen(res, &tdst)
	}
	if n.Addable {
		gc.Agen(n, &src)
	} else {
		gmove(&tsrc, &src)
	}

	if res.Op == gc.ONAME {
		gc.Gvardef(res)
	}

	if res.Addable {
		gc.Agen(res, &dst)
	} else {
		gmove(&tdst, &dst)
	}

	c := int32(w % 4) // bytes
	q := int32(w / 4) // doublewords

	// if we are copying forward on the stack and
	// the src and dst overlap, then reverse direction
	if osrc < odst && odst < osrc+w {
		// reverse direction
		gins(x86.ASTD, nil, nil) // set direction flag
		if c > 0 {
			gconreg(x86.AADDL, w-1, x86.REG_SI)
			gconreg(x86.AADDL, w-1, x86.REG_DI)

			gconreg(x86.AMOVL, int64(c), x86.REG_CX)
			gins(x86.AREP, nil, nil)   // repeat
			gins(x86.AMOVSB, nil, nil) // MOVB *(SI)-,*(DI)-
		}

		if q > 0 {
			if c > 0 {
				gconreg(x86.AADDL, -3, x86.REG_SI)
				gconreg(x86.AADDL, -3, x86.REG_DI)
			} else {
				gconreg(x86.AADDL, w-4, x86.REG_SI)
				gconreg(x86.AADDL, w-4, x86.REG_DI)
			}

			gconreg(x86.AMOVL, int64(q), x86.REG_CX)
			gins(x86.AREP, nil, nil)   // repeat
			gins(x86.AMOVSL, nil, nil) // MOVL *(SI)-,*(DI)-
		}

		// we leave with the flag clear
		gins(x86.ACLD, nil, nil)
	} else {
		gins(x86.ACLD, nil, nil) // paranoia.  TODO(rsc): remove?

		// normal direction
		if q > 128 || (q >= 4 && gc.Nacl) {
			gconreg(x86.AMOVL, int64(q), x86.REG_CX)
			gins(x86.AREP, nil, nil)   // repeat
			gins(x86.AMOVSL, nil, nil) // MOVL *(SI)+,*(DI)+
		} else if q >= 4 {
			p := gins(obj.ADUFFCOPY, nil, nil)
			p.To.Type = obj.TYPE_ADDR
			p.To.Sym = gc.Linksym(gc.Pkglookup("duffcopy", gc.Runtimepkg))

			// 10 and 128 = magic constants: see ../../runtime/asm_386.s
			p.To.Offset = 10 * (128 - int64(q))
		} else if !gc.Nacl && c == 0 {
			var cx gc.Node
			gc.Nodreg(&cx, gc.Types[gc.TINT32], x86.REG_CX)

			// We don't need the MOVSL side-effect of updating SI and DI,
			// and issuing a sequence of MOVLs directly is faster.
			src.Op = gc.OINDREG

			dst.Op = gc.OINDREG
			for q > 0 {
				gmove(&src, &cx) // MOVL x+(SI),CX
				gmove(&cx, &dst) // MOVL CX,x+(DI)
				src.Xoffset += 4
				dst.Xoffset += 4
				q--
			}
		} else {
			for q > 0 {
				gins(x86.AMOVSL, nil, nil) // MOVL *(SI)+,*(DI)+
				q--
//.........這裏部分代碼省略.........
開發者ID:Greentor，項目名稱:go，代碼行數:101，代碼來源:cgen.go


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