{name: "MOVSSloadidx4", argLength: 3, reg: fploadidx, asm: "MOVSS", aux: "SymOff", symEffect: "Read"},                // fp32 load indexed by 4*i
		{name: "MOVSDloadidx1", argLength: 3, reg: fploadidx, asm: "MOVSD", aux: "SymOff", symEffect: "Read"},                // fp64 load indexed by i

The new [iter] package provides the basic definitions for working with
user-defined iterators.

The [slices] package adds several functions that work with iterators:
- [All](/pkg/slices#All) returns an iterator over slice indexes and values.
- [Values](/pkg/slices#Values) returns an iterator over slice elements.
- [Backward](/pkg/slices#Backward) returns an iterator that loops over
  a slice backward.

package types2

import (
	"cmd/compile/internal/syntax"
	"fmt"
)

// This file should not be copied to go/types.  See go.dev/issue/67477

// RenameResult takes an array of (result) fields and an index, and if the indexed field
// does not have a name and if the result in the signature also does not have a name,
// then the signature and field are renamed to
//
//	fmt.Sprintf("#rv%d", i+1)`
//

		// MOVxloadidx: indexed loads
		// load (Q=8,L=4,W=2,B=1) bytes from (arg0+scale*arg1+auxint+aux), arg2=mem.
		// Results are zero-extended. (TODO: sign-extending indexed loads)
		{name: "MOVBloadidx1", argLength: 3, reg: gploadidx, commutative: true, asm: "MOVBLZX", scale: 1, aux: "SymOff", typ: "UInt8", symEffect: "Read"},

		}
	}
}

// indexEOL finds the index of a line ending,
// returning its position and output width.
// A line ending is either a \n or the empty string just before a ^V not beginning a line.
// The output width for \n is 1 (meaning it should be printed)
// but the output width for ^V is 0 (meaning it should be left to begin the next line).
func indexEOL(b []byte) (pos, wid int) {
	for i, c := range b {

		return n.RType
	}
	return mapRType(pos, n.Args[0].Type())
}

// IndexMapRType asserts that n is a map index operation, and returns
// an expression that yields the *runtime._type value representing the
// map type.
func IndexMapRType(pos src.XPos, n *ir.IndexExpr) ir.Node {
	assertOp(n, ir.OINDEXMAP)
	if hasRType(n, n.RType, "RType") {
		return n.RType
	}
	return mapRType(pos, n.X.Type())
}

	// put dynamics into array (5)
	var index int64
	for _, value := range n.List {
		if value.Op() == ir.OKEY {
			kv := value.(*ir.KeyExpr)
			index = typecheck.IndexConst(kv.Key)
			if index < 0 {
				base.Fatalf("slicelit: invalid index %v", kv.Key)
			}
			value = kv.Value
		}
		a := ir.NewIndexExpr(base.Pos, vauto, ir.NewInt(base.Pos, index))
		a.SetBounded(true)
		index++

		// TODO need to check bounds?

	switch x := x.(type) {
	case *constraint.TagExpr:
		return matchTag(x.Tag, tags, prefer)
	case *constraint.NotExpr:
		return !eval(x.X, tags, !prefer)
	case *constraint.AndExpr:
		return eval(x.X, tags, prefer) && eval(x.Y, tags, prefer)
	case *constraint.OrExpr:
		return eval(x.X, tags, prefer) || eval(x.Y, tags, prefer)
	}
	panic(fmt.Sprintf("unexpected constraint expression %T", x))
}

	return mms.indices[mms.mustGetSingleMainModule()]
}

func (mms *MainModuleSet) Index(m module.Version) *modFileIndex {
	mms.indexMu.Lock()
	defer mms.indexMu.Unlock()
	return mms.indices[m]
}

func (mms *MainModuleSet) SetIndex(m module.Version, index *modFileIndex) {
	mms.indexMu.Lock()
	defer mms.indexMu.Unlock()
	mms.indices[m] = index
}

func (mms *MainModuleSet) ModFile(m module.Version) *modfile.File {

(FMOVDload [off1] {sym} (ADDconst [off2] ptr) mem) && is32Bit(int64(off1)+off2)
	&& (ptr.Op != OpSB || !config.ctxt.Flag_dynlink) =>
	(FMOVDload [off1+int32(off2)] {sym} ptr mem)

// register indexed load
(MOVDload  [off] {sym} (ADD ptr idx) mem) && off == 0 && sym == nil => (MOVDloadidx ptr idx mem)
(MOVWUload [off] {sym} (ADD ptr idx) mem) && off == 0 && sym == nil => (MOVWUloadidx ptr idx mem)