cmd/compile: move all usage of delayTransform out of helpers.go

So next CL will make delayTransform to become irgen's method, because
the delay transform logic also depends on irgen.topFuncIsGeneric field.

For #48609

Change-Id: I660ed19856bd06c3b6f4279a9184db96175dea2d
Reviewed-on: https://go-review.googlesource.com/c/go/+/351854
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>

src/cmd/compile/internal/noder/expr.go

@@ -167,7 +167,12 @@ func (g *irgen) expr0(typ types2.Type, expr syntax.Expr) ir.Node {
 			index := g.expr(expr.Index)
 			if index.Op() != ir.OTYPE {
 				// This is just a normal index expression
-				return Index(pos, g.typ(typ), g.expr(expr.X), index)
+				n := Index(pos, g.typ(typ), g.expr(expr.X), index)
+				if !delayTransform() {
+					// transformIndex will modify n.Type() for OINDEXMAP.
+					transformIndex(n)
+				}
+				return n
 			}
 			// This is generic function instantiation with a single type
 			targs = []ir.Node{index}
@@ -200,7 +205,11 @@ func (g *irgen) expr0(typ types2.Type, expr syntax.Expr) ir.Node {
 		return g.selectorExpr(pos, typ, expr)
 
 	case *syntax.SliceExpr:
-		return Slice(pos, g.typ(typ), g.expr(expr.X), g.expr(expr.Index[0]), g.expr(expr.Index[1]), g.expr(expr.Index[2]))
+		n := Slice(pos, g.typ(typ), g.expr(expr.X), g.expr(expr.Index[0]), g.expr(expr.Index[1]), g.expr(expr.Index[2]))
+		if !delayTransform() {
+			transformSlice(n)
+		}
+		return n
 
 	case *syntax.Operation:
 		if expr.Y == nil {
@@ -208,9 +217,21 @@ func (g *irgen) expr0(typ types2.Type, expr syntax.Expr) ir.Node {
 		}
 		switch op := g.op(expr.Op, binOps[:]); op {
 		case ir.OEQ, ir.ONE, ir.OLT, ir.OLE, ir.OGT, ir.OGE:
-			return Compare(pos, g.typ(typ), op, g.expr(expr.X), g.expr(expr.Y))
+			n := Compare(pos, g.typ(typ), op, g.expr(expr.X), g.expr(expr.Y))
+			if !delayTransform() {
+				transformCompare(n)
+			}
+			return n
+		case ir.OANDAND, ir.OOROR:
+			x := g.expr(expr.X)
+			y := g.expr(expr.Y)
+			return typed(x.Type(), ir.NewLogicalExpr(pos, op, x, y))
 		default:
-			return Binary(pos, op, g.typ(typ), g.expr(expr.X), g.expr(expr.Y))
+			n := Binary(pos, op, g.typ(typ), g.expr(expr.X), g.expr(expr.Y))
+			if op == ir.OADD && !delayTransform() {
+				return transformAdd(n)
+			}
+			return n
 		}
 
 	default:

src/cmd/compile/internal/noder/helpers.go

@@ -89,20 +89,16 @@ func Assert(pos src.XPos, x ir.Node, typ *types.Type) ir.Node {
 	return typed(typ, ir.NewTypeAssertExpr(pos, x, nil))
 }
 
-func Binary(pos src.XPos, op ir.Op, typ *types.Type, x, y ir.Node) ir.Node {
+func Binary(pos src.XPos, op ir.Op, typ *types.Type, x, y ir.Node) *ir.BinaryExpr {
 	switch op {
-	case ir.OANDAND, ir.OOROR:
-		return typed(x.Type(), ir.NewLogicalExpr(pos, op, x, y))
 	case ir.OADD:
 		n := ir.NewBinaryExpr(pos, op, x, y)
 		typed(typ, n)
-		r := ir.Node(n)
+		return n
-		if !delayTransform() {
-			r = transformAdd(n)
-		}
-		return r
 	default:
-		return typed(x.Type(), ir.NewBinaryExpr(pos, op, x, y))
+		n := ir.NewBinaryExpr(pos, op, x, y)
+		typed(x.Type(), n)
+		return n
 	}
 }
 
@@ -195,12 +191,9 @@ func Call(pos src.XPos, typ *types.Type, fun ir.Node, args []ir.Node, dots bool)
 	return n
 }
 
-func Compare(pos src.XPos, typ *types.Type, op ir.Op, x, y ir.Node) ir.Node {
+func Compare(pos src.XPos, typ *types.Type, op ir.Op, x, y ir.Node) *ir.BinaryExpr {
 	n := ir.NewBinaryExpr(pos, op, x, y)
 	typed(typ, n)
-	if !delayTransform() {
-		transformCompare(n)
-	}
 	return n
 }
 
@@ -270,26 +263,19 @@ func method(typ *types.Type, index int) *types.Field {
 	return types.ReceiverBaseType(typ).Methods().Index(index)
 }
 
-func Index(pos src.XPos, typ *types.Type, x, index ir.Node) ir.Node {
+func Index(pos src.XPos, typ *types.Type, x, index ir.Node) *ir.IndexExpr {
 	n := ir.NewIndexExpr(pos, x, index)
 	typed(typ, n)
-	if !delayTransform() {
-		// transformIndex will modify n.Type() for OINDEXMAP.
-		transformIndex(n)
-	}
 	return n
 }
 
-func Slice(pos src.XPos, typ *types.Type, x, low, high, max ir.Node) ir.Node {
+func Slice(pos src.XPos, typ *types.Type, x, low, high, max ir.Node) *ir.SliceExpr {
 	op := ir.OSLICE
 	if max != nil {
 		op = ir.OSLICE3
 	}
 	n := ir.NewSliceExpr(pos, op, x, low, high, max)
 	typed(typ, n)
-	if !delayTransform() {
-		transformSlice(n)
-	}
 	return n
 }