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Golang gc.Flowend函數代碼示例

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

func peep(firstp *obj.Prog) {
	g := gc.Flowstart(firstp, nil)
	if g == nil {
		return
	}
	gactive = 0

	run := func(name string, pass func(r *gc.Flow) int) int {
		n := pass(g.Start)
		if gc.Debug['P'] != 0 {
			fmt.Println(name, ":", n)
		}
		if gc.Debug['P'] != 0 && gc.Debug['v'] != 0 {
			gc.Dumpit(name, g.Start, 0)
		}
		return n
	}

	for {
		n := 0
		n += run("constant propagation", constantPropagation)
		n += run("copy propagation", copyPropagation)
		n += run("cast propagation", castPropagation)
		n += run("remove load-hit-stores", removeLoadHitStores)
		n += run("dead code elimination", deadCodeElimination)
		if n == 0 {
			break
		}
	}
	run("fuse op moves", fuseOpMoves)
	run("fuse clears", fuseClear)
	run("load pipelining", loadPipelining)
	run("fuse compare branch", fuseCompareBranch)
	run("simplify ops", simplifyOps)
	run("dead code elimination", deadCodeElimination)

	// TODO(mundaym): load/store multiple aren't currently handled by copyu
	// so this pass must be last.
	run("fuse multiple", fuseMultiple)

	gc.Flowend(g)
}
開發者ID:hurkgu，項目名稱:go，代碼行數:42，代碼來源:peep.go

示例2: peep


//.........這裏部分代碼省略.........
				p.From.Type = obj.TYPE_REG
				if p.Reg != 0 {
					p.From.Reg = p.Reg
				} else {
					p.From.Reg = p.To.Reg
				}
				p.Reg = 0
			}
		}
	}

	for r := (*gc.Flow)(g.Start); r != nil; r = r.Link {
		p = r.Prog
		switch p.As {
		case arm.AMOVW,
			arm.AMOVB,
			arm.AMOVBS,
			arm.AMOVBU:
			if p.From.Type == obj.TYPE_MEM && p.From.Offset == 0 {
				xtramodes(g, r, &p.From)
			} else if p.To.Type == obj.TYPE_MEM && p.To.Offset == 0 {
				xtramodes(g, r, &p.To)
			} else {
				continue
			}
		}
	}

	//		case ACMP:
	//			/*
	//			 * elide CMP $0,x if calculation of x can set condition codes
	//			 */
	//			if(isdconst(&p->from) || p->from.offset != 0)
	//				continue;
	//			r2 = r->s1;
	//			if(r2 == nil)
	//				continue;
	//			t = r2->prog->as;
	//			switch(t) {
	//			default:
	//				continue;
	//			case ABEQ:
	//			case ABNE:
	//			case ABMI:
	//			case ABPL:
	//				break;
	//			case ABGE:
	//				t = ABPL;
	//				break;
	//			case ABLT:
	//				t = ABMI;
	//				break;
	//			case ABHI:
	//				t = ABNE;
	//				break;
	//			case ABLS:
	//				t = ABEQ;
	//				break;
	//			}
	//			r1 = r;
	//			do
	//				r1 = uniqp(r1);
	//			while (r1 != nil && r1->prog->as == ANOP);
	//			if(r1 == nil)
	//				continue;
	//			p1 = r1->prog;
	//			if(p1->to.type != TYPE_REG)
	//				continue;
	//			if(p1->to.reg != p->reg)
	//			if(!(p1->as == AMOVW && p1->from.type == TYPE_REG && p1->from.reg == p->reg))
	//				continue;
	//
	//			switch(p1->as) {
	//			default:
	//				continue;
	//			case AMOVW:
	//				if(p1->from.type != TYPE_REG)
	//					continue;
	//			case AAND:
	//			case AEOR:
	//			case AORR:
	//			case ABIC:
	//			case AMVN:
	//			case ASUB:
	//			case ARSB:
	//			case AADD:
	//			case AADC:
	//			case ASBC:
	//			case ARSC:
	//				break;
	//			}
	//			p1->scond |= C_SBIT;
	//			r2->prog->as = t;
	//			excise(r);
	//			continue;

	//	predicate(g);

	gc.Flowend(g)
}
開發者ID:xiezerozero，項目名稱:go，代碼行數:101，代碼來源:peep.go

示例3: peep


//.........這裏部分代碼省略.........
			if p.From.Offset == 1 {
				if p.As == x86.AADDQ {
					p.As = x86.AINCQ
				} else if p.As == x86.AADDL {
					p.As = x86.AINCL
				} else {
					p.As = x86.AINCW
				}
				p.From = obj.Addr{}
				break
			}

		case x86.ASUBL,
			x86.ASUBQ,
			x86.ASUBW:
			if p.From.Type != obj.TYPE_CONST || needc(p.Link) {
				break
			}
			if p.From.Offset == -1 {
				if p.As == x86.ASUBQ {
					p.As = x86.AINCQ
				} else if p.As == x86.ASUBL {
					p.As = x86.AINCL
				} else {
					p.As = x86.AINCW
				}
				p.From = obj.Addr{}
				break
			}

			if p.From.Offset == 1 {
				if p.As == x86.ASUBQ {
					p.As = x86.ADECQ
				} else if p.As == x86.ASUBL {
					p.As = x86.ADECL
				} else {
					p.As = x86.ADECW
				}
				p.From = obj.Addr{}
				break
			}
		}
	}

	if t != 0 {
		goto loop1
	}

	// MOVLQZX removal.
	// The MOVLQZX exists to avoid being confused for a
	// MOVL that is just copying 32-bit data around during
	// copyprop.  Now that copyprop is done, remov MOVLQZX R1, R2
	// if it is dominated by an earlier ADDL/MOVL/etc into R1 that
	// will have already cleared the high bits.
	//
	// MOVSD removal.
	// We never use packed registers, so a MOVSD between registers
	// can be replaced by MOVAPD, which moves the pair of float64s
	// instead of just the lower one.  We only use the lower one, but
	// the processor can do better if we do moves using both.
	for r := (*gc.Flow)(g.Start); r != nil; r = r.Link {
		p = r.Prog
		if p.As == x86.AMOVLQZX {
			if regtyp(&p.From) {
				if p.From.Type == p.To.Type && p.From.Reg == p.To.Reg {
					if prevl(r, int(p.From.Reg)) {
						excise(r)
					}
				}
			}
		}

		if p.As == x86.AMOVSD {
			if regtyp(&p.From) {
				if regtyp(&p.To) {
					p.As = x86.AMOVAPD
				}
			}
		}
	}

	// load pipelining
	// push any load from memory as early as possible
	// to give it time to complete before use.
	for r := (*gc.Flow)(g.Start); r != nil; r = r.Link {
		p = r.Prog
		switch p.As {
		case x86.AMOVB,
			x86.AMOVW,
			x86.AMOVL,
			x86.AMOVQ,
			x86.AMOVLQZX:
			if regtyp(&p.To) && !regconsttyp(&p.From) {
				pushback(r)
			}
		}
	}

	gc.Flowend(g)
}
開發者ID:danny8002，項目名稱:go，代碼行數:101，代碼來源:peep.go

示例4: peep


//.........這裏部分代碼省略.........
	}
	gactive = 0

	var p *obj.Prog
	var r *gc.Flow
	var t int
loop1:
	if gc.Debug['P'] != 0 && gc.Debug['v'] != 0 {
		gc.Dumpit("loop1", g.Start, 0)
	}

	t = 0
	for r = g.Start; r != nil; r = r.Link {
		p = r.Prog

		// TODO(austin) Handle smaller moves.  arm and amd64
		// distinguish between moves that moves that *must*
		// sign/zero extend and moves that don't care so they
		// can eliminate moves that don't care without
		// breaking moves that do care.  This might let us
		// simplify or remove the next peep loop, too.
		if p.As == mips.AMOVV || p.As == mips.AMOVF || p.As == mips.AMOVD {
			if regtyp(&p.To) {
				// Try to eliminate reg->reg moves
				if regtyp(&p.From) {
					if isfreg(&p.From) == isfreg(&p.To) {
						if copyprop(r) {
							excise(r)
							t++
						} else if subprop(r) && copyprop(r) {
							excise(r)
							t++
						}
					}
				}

				// Convert uses to $0 to uses of R0 and
				// propagate R0
				if regzer(&p.From) != 0 {
					if p.To.Type == obj.TYPE_REG && !isfreg(&p.To) {
						p.From.Type = obj.TYPE_REG
						p.From.Reg = mips.REGZERO
						if copyprop(r) {
							excise(r)
							t++
						} else if subprop(r) && copyprop(r) {
							excise(r)
							t++
						}
					}
				}
			}
		}
	}

	if t != 0 {
		goto loop1
	}

	/*
	 * look for MOVB x,R; MOVB R,R (for small MOVs not handled above)
	 */
	var p1 *obj.Prog
	var r1 *gc.Flow
	for r := (*gc.Flow)(g.Start); r != nil; r = r.Link {
		p = r.Prog
		switch p.As {
		default:
			continue

		case mips.AMOVH,
			mips.AMOVHU,
			mips.AMOVB,
			mips.AMOVBU,
			mips.AMOVW,
			mips.AMOVWU:
			if p.To.Type != obj.TYPE_REG {
				continue
			}
		}

		r1 = r.Link
		if r1 == nil {
			continue
		}
		p1 = r1.Prog
		if p1.As != p.As {
			continue
		}
		if p1.From.Type != obj.TYPE_REG || p1.From.Reg != p.To.Reg {
			continue
		}
		if p1.To.Type != obj.TYPE_REG || p1.To.Reg != p.To.Reg {
			continue
		}
		excise(r1)
	}

	gc.Flowend(g)
}
開發者ID:ckeyer，項目名稱:gosrc，代碼行數:101，代碼來源:peep.go

示例5: peep


//.........這裏部分代碼省略.........
				if regtyp(&p.From) {
					if copyprop(g, r) {
						excise(r)
						t++
					} else if subprop(r) && copyprop(g, r) {
						excise(r)
						t++
					}
				}
			}

		case x86.AMOVBLZX,
			x86.AMOVWLZX,
			x86.AMOVBLSX,
			x86.AMOVWLSX:
			if regtyp(&p.To) {
				r1 = rnops(gc.Uniqs(r))
				if r1 != nil {
					p1 = r1.Prog
					if p.As == p1.As && p.To.Type == p1.From.Type && p.To.Reg == p1.From.Reg {
						p1.As = x86.AMOVL
						t++
					}
				}
			}

		case x86.AADDL,
			x86.AADDW:
			if p.From.Type != obj.TYPE_CONST || needc(p.Link) {
				break
			}
			if p.From.Offset == -1 {
				if p.As == x86.AADDL {
					p.As = x86.ADECL
				} else {
					p.As = x86.ADECW
				}
				p.From = obj.Addr{}
				break
			}

			if p.From.Offset == 1 {
				if p.As == x86.AADDL {
					p.As = x86.AINCL
				} else {
					p.As = x86.AINCW
				}
				p.From = obj.Addr{}
				break
			}

		case x86.ASUBL,
			x86.ASUBW:
			if p.From.Type != obj.TYPE_CONST || needc(p.Link) {
				break
			}
			if p.From.Offset == -1 {
				if p.As == x86.ASUBL {
					p.As = x86.AINCL
				} else {
					p.As = x86.AINCW
				}
				p.From = obj.Addr{}
				break
			}

			if p.From.Offset == 1 {
				if p.As == x86.ASUBL {
					p.As = x86.ADECL
				} else {
					p.As = x86.ADECW
				}
				p.From = obj.Addr{}
				break
			}
		}
	}

	if t != 0 {
		goto loop1
	}

	// MOVSD removal.
	// We never use packed registers, so a MOVSD between registers
	// can be replaced by MOVAPD, which moves the pair of float64s
	// instead of just the lower one. We only use the lower one, but
	// the processor can do better if we do moves using both.
	for r := g.Start; r != nil; r = r.Link {
		p = r.Prog
		if p.As == x86.AMOVSD {
			if regtyp(&p.From) {
				if regtyp(&p.To) {
					p.As = x86.AMOVAPD
				}
			}
		}
	}

	gc.Flowend(g)
}
開發者ID:sreis，項目名稱:go，代碼行數:101，代碼來源:peep.go

示例6: peep


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

	if t != 0 {
		goto loop1
	}

	/*
	 * look for MOVB x,R; MOVB R,R (for small MOVs not handled above)
	 */
	var p1 *obj.Prog
	var r1 *gc.Flow
	for r := g.Start; r != nil; r = r.Link {
		p = r.Prog
		switch p.As {
		default:
			continue

		case arm64.AMOVH,
			arm64.AMOVHU,
			arm64.AMOVB,
			arm64.AMOVBU,
			arm64.AMOVW,
			arm64.AMOVWU:
			if p.To.Type != obj.TYPE_REG {
				continue
			}
		}

		r1 = r.Link
		if r1 == nil {
			continue
		}
		p1 = r1.Prog
		if p1.As != p.As {
			continue
		}
		if p1.From.Type != obj.TYPE_REG || p1.From.Reg != p.To.Reg {
			continue
		}
		if p1.To.Type != obj.TYPE_REG || p1.To.Reg != p.To.Reg {
			continue
		}
		excise(r1)
	}

	if gc.Debug['D'] > 1 {
		goto ret /* allow following code improvement to be suppressed */
	}

	// MOVD $c, R'; ADD R', R (R' unused) -> ADD $c, R
	for r := g.Start; r != nil; r = r.Link {
		p = r.Prog
		switch p.As {
		default:
			continue

		case arm64.AMOVD:
			if p.To.Type != obj.TYPE_REG {
				continue
			}
			if p.From.Type != obj.TYPE_CONST {
				continue
			}
			if p.From.Offset < 0 || 4096 <= p.From.Offset {
				continue
			}
		}
		r1 = r.Link
		if r1 == nil {
			continue
		}
		p1 = r1.Prog
		if p1.As != arm64.AADD && p1.As != arm64.ASUB { // TODO(aram): also logical after we have bimm.
			continue
		}
		if p1.From.Type != obj.TYPE_REG || p1.From.Reg != p.To.Reg {
			continue
		}
		if p1.To.Type != obj.TYPE_REG {
			continue
		}
		if gc.Debug['P'] != 0 {
			fmt.Printf("encoding $%d directly into %v in:\n%v\n%v\n", p.From.Offset, obj.Aconv(p1.As), p, p1)
		}
		p1.From.Type = obj.TYPE_CONST
		p1.From = p.From
		excise(r)
	}

	/* TODO(minux):
	 * look for OP x,y,R; CMP R, $0 -> OP.S x,y,R
	 * when OP can set condition codes correctly
	 */

ret:
	gc.Flowend(g)
}
開發者ID:duhaibo0404，項目名稱:go-1，代碼行數:101，代碼來源:peep.go

示例7: peep


//.........這裏部分代碼省略.........
			continue
		}
		p1 = r1.Prog

		switch p.As {
		case s390x.ACMP:
			switch p1.As {
			case s390x.ABCL, s390x.ABC:
				continue
			case s390x.ABEQ:
				t = s390x.ACMPBEQ
			case s390x.ABGE:
				t = s390x.ACMPBGE
			case s390x.ABGT:
				t = s390x.ACMPBGT
			case s390x.ABLE:
				t = s390x.ACMPBLE
			case s390x.ABLT:
				t = s390x.ACMPBLT
			case s390x.ABNE:
				t = s390x.ACMPBNE
			default:
				continue
			}

		case s390x.ACMPU:
			switch p1.As {
			case s390x.ABCL, s390x.ABC:
				continue
			case s390x.ABEQ:
				t = s390x.ACMPUBEQ
			case s390x.ABGE:
				t = s390x.ACMPUBGE
			case s390x.ABGT:
				t = s390x.ACMPUBGT
			case s390x.ABLE:
				t = s390x.ACMPUBLE
			case s390x.ABLT:
				t = s390x.ACMPUBLT
			case s390x.ABNE:
				t = s390x.ACMPUBNE
			default:
				continue
			}

		case s390x.ACMPW, s390x.ACMPWU:
			continue

		default:
			continue
		}

		if gc.Debug['D'] != 0 {
			fmt.Printf("cnb %v; %v -> ", p, p1)
		}

		if p1.To.Sym != nil {
			continue
		}

		if p.To.Type == obj.TYPE_REG {
			p1.As = int16(t)
			p1.From = p.From
			p1.Reg = p.To.Reg
			p1.From3 = nil
		} else if p.To.Type == obj.TYPE_CONST {
			switch p.As {
			case s390x.ACMP, s390x.ACMPW:
				if (p.To.Offset < -(1 << 7)) || (p.To.Offset >= ((1 << 7) - 1)) {
					continue
				}
			case s390x.ACMPU, s390x.ACMPWU:
				if p.To.Offset >= (1 << 8) {
					continue
				}
			default:
			}
			p1.As = int16(t)
			p1.From = p.From
			p1.Reg = 0
			p1.From3 = new(obj.Addr)
			*(p1.From3) = p.To
		} else {
			continue
		}

		if gc.Debug['D'] != 0 {
			fmt.Printf("%v\n", p1)
		}
		cnb_cnt += 1
		excise(r)
	}

	if gc.Debug['v'] != 0 {
		gc.Dumpit("compare and branch", g.Start, 0)
	}

ret:
	gc.Flowend(g)
}
開發者ID:wycharry，項目名稱:go，代碼行數:101，代碼來源:peep.go


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