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Golang gc.Componentgen函數代碼示例

本文整理匯總了Golang中cmd/compile/internal/gc.Componentgen函數的典型用法代碼示例。如果您正苦於以下問題：Golang Componentgen函數的具體用法？Golang Componentgen怎麽用？Golang Componentgen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Componentgen函數的7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: clearfat

func clearfat(nl *gc.Node) {
	/* clear a fat object */
	if gc.Debug['g'] != 0 {
		fmt.Printf("clearfat %v (%v, size: %d)\n", nl, nl.Type, 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:Ericean，項目名稱:go，代碼行數:84，代碼來源:ggen.go

示例2: clearfat

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

	var r0 gc.Node
	gc.Nodreg(&r0, gc.Types[gc.TUINT64], arm64.REGZERO)
	var dst gc.Node

	// REGRT1 is reserved on arm64, see arm64/gsubr.go.
	gc.Nodreg(&dst, gc.Types[gc.Tptr], arm64.REGRT1)
	gc.Agen(nl, &dst)

	var boff uint64
	if q > 128 {
		p := gins(arm64.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(arm64.AMOVD, &dst, &end)
		p.From.Type = obj.TYPE_ADDR
		p.From.Offset = int64(q * 8)

		p = gins(arm64.AMOVD, &r0, &dst)
		p.To.Type = obj.TYPE_MEM
		p.To.Offset = 8
		p.Scond = arm64.C_XPRE
		pl := (*obj.Prog)(p)

		p = gcmp(arm64.ACMP, &dst, &end)
		gc.Patch(gc.Gbranch(arm64.ABNE, nil, 0), pl)

		gc.Regfree(&end)

		// The loop leaves R16 on the last zeroed dword
		boff = 8
	} else if q >= 4 && !darwin { // darwin ld64 cannot handle BR26 reloc with non-zero addend
		p := gins(arm64.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_arm64x.s
		p.To.Offset = int64(4 * (128 - q))

		// duffzero leaves R16 on the last zeroed dword
		boff = 8
	} else {
		var p *obj.Prog
		for t := uint64(0); t < q; t++ {
			p = gins(arm64.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(arm64.AMOVB, &r0, &dst)
		p.To.Type = obj.TYPE_MEM
		p.To.Offset = int64(t + boff)
	}
}
開發者ID:rentongzhang，項目名稱:go，代碼行數:80，代碼來源:ggen.go

示例3: clearfat

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

	w := uint64(nl.Type.Width)

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

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

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

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

	var boff uint64
	if q > 128 {
		p := gins(mips.ASUBV, 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(mips.AMOVV, &dst, &end)
		p.From.Type = obj.TYPE_ADDR
		p.From.Offset = int64(q * 8)

		p = gins(mips.AMOVV, &r0, &dst)
		p.To.Type = obj.TYPE_MEM
		p.To.Offset = 8
		pl := p

		p = gins(mips.AADDV, nil, &dst)
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = 8

		gc.Patch(ginsbranch(mips.ABNE, nil, &dst, &end, 0), pl)

		gc.Regfree(&end)

		// The loop leaves R1 on the last zeroed dword
		boff = 8
		// TODO(dfc): https://golang.org/issue/12108
		// If DUFFZERO is used inside a tail call (see genwrapper) it will
		// overwrite the link register.
	} else if false && q >= 4 {
		p := gins(mips.ASUBV, nil, &dst)
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = 8
		f := gc.Sysfunc("duffzero")
		p = gins(obj.ADUFFZERO, nil, f)
		gc.Afunclit(&p.To, f)

		// 8 and 128 = magic constants: see ../../runtime/asm_mips64x.s
		p.To.Offset = int64(8 * (128 - q))

		// duffzero leaves R1 on the last zeroed dword
		boff = 8
	} else {
		var p *obj.Prog
		for t := uint64(0); t < q; t++ {
			p = gins(mips.AMOVV, &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(mips.AMOVB, &r0, &dst)
		p.To.Type = obj.TYPE_MEM
		p.To.Offset = int64(t + boff)
	}

	gc.Regfree(&dst)
}
開發者ID:Greentor，項目名稱:go，代碼行數:90，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: 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

	var r0 gc.Node
	r0.Op = gc.OREGISTER

	r0.Reg = arm.REG_R0
	var r1 gc.Node
	r1.Op = gc.OREGISTER
	r1.Reg = arm.REG_R1
	var dst gc.Node
	gc.Regalloc(&dst, gc.Types[gc.Tptr], &r1)
	gc.Agen(nl, &dst)
	var nc gc.Node
	gc.Nodconst(&nc, gc.Types[gc.TUINT32], 0)
	var nz gc.Node
	gc.Regalloc(&nz, gc.Types[gc.TUINT32], &r0)
	gc.Cgen(&nc, &nz)

	if q > 128 {
		var end gc.Node
		gc.Regalloc(&end, gc.Types[gc.Tptr], nil)
		p := gins(arm.AMOVW, &dst, &end)
		p.From.Type = obj.TYPE_ADDR
		p.From.Offset = int64(q) * 4

		p = gins(arm.AMOVW, &nz, &dst)
		p.To.Type = obj.TYPE_MEM
		p.To.Offset = 4
		p.Scond |= arm.C_PBIT
		pl := p

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

		gc.Regfree(&end)
	} else if q >= 4 && !gc.Nacl {
		f := gc.Sysfunc("duffzero")
		p := gins(obj.ADUFFZERO, nil, f)
		gc.Afunclit(&p.To, f)

		// 4 and 128 = magic constants: see ../../runtime/asm_arm.s
		p.To.Offset = 4 * (128 - int64(q))
	} else {
		var p *obj.Prog
		for q > 0 {
			p = gins(arm.AMOVW, &nz, &dst)
			p.To.Type = obj.TYPE_MEM
			p.To.Offset = 4
			p.Scond |= arm.C_PBIT

			//print("1. %v\n", p);
			q--
		}
	}

	var p *obj.Prog
	for c > 0 {
		p = gins(arm.AMOVB, &nz, &dst)
		p.To.Type = obj.TYPE_MEM
		p.To.Offset = 1
		p.Scond |= arm.C_PBIT

		//print("2. %v\n", p);
		c--
	}

	gc.Regfree(&dst)
	gc.Regfree(&nz)
}
開發者ID:arnold8，項目名稱:go，代碼行數:84，代碼來源:ggen.go

示例6: clearfat

// clearfat clears (i.e. replaces with zeros) the value pointed to by nl.
func clearfat(nl *gc.Node) {
	if gc.Debug['g'] != 0 {
		fmt.Printf("clearfat %v (%v, size: %d)\n", nl, nl.Type, nl.Type.Width)
	}

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

	var dst gc.Node
	gc.Regalloc(&dst, gc.Types[gc.Tptr], nil)
	gc.Agen(nl, &dst)

	var boff int64
	w := nl.Type.Width
	if w > clearLoopCutoff {
		// Generate a loop clearing 256 bytes per iteration using XCs.
		var end gc.Node
		gc.Regalloc(&end, gc.Types[gc.Tptr], nil)
		p := gins(s390x.AMOVD, &dst, &end)
		p.From.Type = obj.TYPE_ADDR
		p.From.Offset = w - (w % 256)

		p = gins(s390x.AXC, &dst, &dst)
		p.From.Type = obj.TYPE_MEM
		p.From.Offset = 0
		p.To.Type = obj.TYPE_MEM
		p.To.Offset = 0
		p.From3 = new(obj.Addr)
		p.From3.Offset = 256
		p.From3.Type = obj.TYPE_CONST
		pl := p

		ginscon(s390x.AADD, 256, &dst)
		gins(s390x.ACMP, &dst, &end)
		gc.Patch(gc.Gbranch(s390x.ABNE, nil, 0), pl)
		gc.Regfree(&end)
		w = w % 256
	}

	// Generate instructions to clear the remaining memory.
	for w > 0 {
		n := w

		// Can clear at most 256 bytes per instruction.
		if n > 256 {
			n = 256
		}

		switch n {
		// Handle very small clears using moves.
		case 8, 4, 2, 1:
			ins := s390x.AMOVB
			switch n {
			case 8:
				ins = s390x.AMOVD
			case 4:
				ins = s390x.AMOVW
			case 2:
				ins = s390x.AMOVH
			}
			p := gins(ins, nil, &dst)
			p.From.Type = obj.TYPE_CONST
			p.From.Offset = 0
			p.To.Type = obj.TYPE_MEM
			p.To.Offset = boff

		// Handle clears that would require multiple moves with a XC.
		default:
			p := gins(s390x.AXC, &dst, &dst)
			p.From.Type = obj.TYPE_MEM
			p.From.Offset = boff
			p.To.Type = obj.TYPE_MEM
			p.To.Offset = boff
			p.From3 = new(obj.Addr)
			p.From3.Offset = n
			p.From3.Type = obj.TYPE_CONST
		}

		boff += n
		w -= n
	}

	gc.Regfree(&dst)
}
開發者ID:2thetop，項目名稱:go，代碼行數:87，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


注：本文中的cmd/compile/internal/gc.Componentgen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。