diff --git a/src/cmd/compile/internal/gc/align.go b/src/cmd/compile/internal/gc/align.go
index ff0adb3fe2d..741588ed440 100644
--- a/src/cmd/compile/internal/gc/align.go
+++ b/src/cmd/compile/internal/gc/align.go
@@ -281,7 +281,7 @@ func dowidth(t *Type) {
 		}
 
 	case TSTRUCT:
-		if t.Funarg != 0 {
+		if t.Funarg {
 			Fatalf("dowidth fn struct %v", t)
 		}
 		w = widstruct(t, t, 0, 1)
@@ -366,7 +366,7 @@ func checkwidth(t *Type) {
 
 	// function arg structs should not be checked
 	// outside of the enclosing function.
-	if t.Funarg != 0 {
+	if t.Funarg {
 		Fatalf("checkwidth %v", t)
 	}
 
@@ -375,10 +375,10 @@ func checkwidth(t *Type) {
 		return
 	}
 
-	if t.Deferwidth != 0 {
+	if t.Deferwidth {
 		return
 	}
-	t.Deferwidth = 1
+	t.Deferwidth = true
 
 	l := tlfree
 	if l != nil {
@@ -405,7 +405,7 @@ func resumecheckwidth() {
 		Fatalf("resumecheckwidth")
 	}
 	for l := tlq; l != nil; l = tlq {
-		l.t.Deferwidth = 0
+		l.t.Deferwidth = false
 		tlq = l.next
 		dowidth(l.t)
 		l.next = tlfree
diff --git a/src/cmd/compile/internal/gc/closure.go b/src/cmd/compile/internal/gc/closure.go
index 999bf3900b3..e7bece8bd9e 100644
--- a/src/cmd/compile/internal/gc/closure.go
+++ b/src/cmd/compile/internal/gc/closure.go
@@ -322,7 +322,7 @@ func transformclosure(xfunc *Node) {
 				continue
 			}
 			fld = typ(TFIELD)
-			fld.Funarg = 1
+			fld.Funarg = true
 			if v.Name.Byval {
 				// If v is captured by value, we merely downgrade it to PPARAM.
 				v.Class = PPARAM
diff --git a/src/cmd/compile/internal/gc/dcl.go b/src/cmd/compile/internal/gc/dcl.go
index 62aca0b2772..06092742fa9 100644
--- a/src/cmd/compile/internal/gc/dcl.go
+++ b/src/cmd/compile/internal/gc/dcl.go
@@ -914,11 +914,11 @@ func tofunargs(l *NodeList) *Type {
 	var f *Type
 
 	t := typ(TSTRUCT)
-	t.Funarg = 1
+	t.Funarg = true
 
 	for tp := &t.Type; l != nil; l = l.Next {
 		f = structfield(l.N)
-		f.Funarg = 1
+		f.Funarg = true
 
 		// esc.c needs to find f given a PPARAM to add the tag.
 		if l.N.Left != nil && l.N.Left.Class == PPARAM {
@@ -1233,11 +1233,11 @@ func functype(this *Node, in *NodeList, out *NodeList) *Type {
 	}
 	t.Outtuple = count(out)
 	t.Intuple = count(in)
-	t.Outnamed = 0
+	t.Outnamed = false
 	if t.Outtuple > 0 && out.N.Left != nil && out.N.Left.Orig != nil {
 		s := out.N.Left.Orig.Sym
 		if s != nil && (s.Name[0] != '~' || s.Name[1] != 'r') { // ~r%d is the name invented for an unnamed result
-			t.Outnamed = 1
+			t.Outnamed = true
 		}
 	}
 
diff --git a/src/cmd/compile/internal/gc/esc.go b/src/cmd/compile/internal/gc/esc.go
index eecfde02a38..585b327c9ad 100644
--- a/src/cmd/compile/internal/gc/esc.go
+++ b/src/cmd/compile/internal/gc/esc.go
@@ -1356,7 +1356,7 @@ func esccall(e *EscState, n *Node, up *Node) {
 	ll := n.List
 	if n.List != nil && n.List.Next == nil {
 		a := n.List.N
-		if a.Type.Etype == TSTRUCT && a.Type.Funarg != 0 { // f(g()).
+		if a.Type.Etype == TSTRUCT && a.Type.Funarg { // f(g()).
 			ll = e.nodeEscState(a).Escretval
 		}
 	}
diff --git a/src/cmd/compile/internal/gc/export.go b/src/cmd/compile/internal/gc/export.go
index 0edccce0516..de3edfeb643 100644
--- a/src/cmd/compile/internal/gc/export.go
+++ b/src/cmd/compile/internal/gc/export.go
@@ -273,10 +273,10 @@ func dumpexporttype(t *Type) {
 	if t == nil {
 		return
 	}
-	if t.Printed != 0 || t == Types[t.Etype] || t == bytetype || t == runetype || t == errortype {
+	if t.Printed || t == Types[t.Etype] || t == bytetype || t == runetype || t == errortype {
 		return
 	}
-	t.Printed = 1
+	t.Printed = true
 
 	if t.Sym != nil && t.Etype != TFIELD {
 		dumppkg(t.Sym.Pkg)
@@ -548,7 +548,7 @@ func dumpasmhdr() {
 
 		case OTYPE:
 			t = n.Type
-			if t.Etype != TSTRUCT || t.Map != nil || t.Funarg != 0 {
+			if t.Etype != TSTRUCT || t.Map != nil || t.Funarg {
 				break
 			}
 			fmt.Fprintf(b, "#define %s__size %d\n", t.Sym.Name, int(t.Width))
diff --git a/src/cmd/compile/internal/gc/fmt.go b/src/cmd/compile/internal/gc/fmt.go
index a619740bd8a..e5ddf9f50a7 100644
--- a/src/cmd/compile/internal/gc/fmt.go
+++ b/src/cmd/compile/internal/gc/fmt.go
@@ -647,7 +647,7 @@ func typefmt(t *Type, flag int) string {
 		}
 
 		var buf bytes.Buffer
-		if t.Funarg != 0 {
+		if t.Funarg {
 			buf.WriteString("(")
 			if fmtmode == FTypeId || fmtmode == FErr { // no argument names on function signature, and no "noescape"/"nosplit" tags
 				for t1 := t.Type; t1 != nil; t1 = t1.Down {
@@ -704,7 +704,7 @@ func typefmt(t *Type, flag int) string {
 			}
 
 			if s != nil && t.Embedded == 0 {
-				if t.Funarg != 0 {
+				if t.Funarg {
 					name = Nconv(t.Nname, 0)
 				} else if flag&obj.FmtLong != 0 {
 					name = Sconv(s, obj.FmtShort|obj.FmtByte) // qualify non-exported names (used on structs, not on funarg)
diff --git a/src/cmd/compile/internal/gc/go.go b/src/cmd/compile/internal/gc/go.go
index 21e64864153..f360378a43d 100644
--- a/src/cmd/compile/internal/gc/go.go
+++ b/src/cmd/compile/internal/gc/go.go
@@ -155,15 +155,15 @@ type Sym struct {
 type Type struct {
 	Etype       uint8
 	Nointerface bool
-	Noalg       uint8
+	Noalg       bool
 	Chan        uint8
 	Trecur      uint8 // to detect loops
-	Printed     uint8
+	Printed     bool
 	Embedded    uint8 // TFIELD embedded type
-	Funarg      uint8 // on TSTRUCT and TFIELD
-	Copyany     uint8
+	Funarg      bool  // on TSTRUCT and TFIELD
+	Copyany     bool
 	Local       bool // created in this file
-	Deferwidth  uint8
+	Deferwidth  bool
 	Broke       bool // broken type definition.
 	Isddd       bool // TFIELD is ... argument
 	Align       uint8
@@ -177,7 +177,7 @@ type Type struct {
 	Thistuple int
 	Outtuple  int
 	Intuple   int
-	Outnamed  uint8
+	Outnamed  bool
 
 	Method  *Type
 	Xmethod *Type
@@ -699,7 +699,7 @@ type Flow struct {
 	Id     int32  // sequence number in flow graph
 	Rpo    int32  // reverse post ordering
 	Loop   uint16 // x5 for every loop
-	Refset uint8  // diagnostic generated
+	Refset bool   // diagnostic generated
 
 	Data interface{} // for use by client
 }
diff --git a/src/cmd/compile/internal/gc/gsubr.go b/src/cmd/compile/internal/gc/gsubr.go
index a4ece1d895c..7e085d94b2f 100644
--- a/src/cmd/compile/internal/gc/gsubr.go
+++ b/src/cmd/compile/internal/gc/gsubr.go
@@ -511,7 +511,7 @@ func nodarg(t *Type, fp int) *Node {
 	var n *Node
 
 	// entire argument struct, not just one arg
-	if t.Etype == TSTRUCT && t.Funarg != 0 {
+	if t.Etype == TSTRUCT && t.Funarg {
 		n = Nod(ONAME, nil, nil)
 		n.Sym = Lookup(".args")
 		n.Type = t
diff --git a/src/cmd/compile/internal/gc/lex.go b/src/cmd/compile/internal/gc/lex.go
index d2f8912e04d..4cc3b6398e4 100644
--- a/src/cmd/compile/internal/gc/lex.go
+++ b/src/cmd/compile/internal/gc/lex.go
@@ -2288,20 +2288,20 @@ func lexinit1() {
 
 	rcvr.Type = typ(TFIELD)
 	rcvr.Type.Type = Ptrto(typ(TSTRUCT))
-	rcvr.Funarg = 1
+	rcvr.Funarg = true
 	in := typ(TSTRUCT)
-	in.Funarg = 1
+	in.Funarg = true
 	out := typ(TSTRUCT)
 	out.Type = typ(TFIELD)
 	out.Type.Type = Types[TSTRING]
-	out.Funarg = 1
+	out.Funarg = true
 	f := typ(TFUNC)
 	*getthis(f) = rcvr
 	*Getoutarg(f) = out
 	*getinarg(f) = in
 	f.Thistuple = 1
 	f.Intuple = 0
-	f.Outnamed = 0
+	f.Outnamed = false
 	f.Outtuple = 1
 	t := typ(TINTER)
 	t.Type = typ(TFIELD)
diff --git a/src/cmd/compile/internal/gc/order.go b/src/cmd/compile/internal/gc/order.go
index ad021de25dc..c783d641a59 100644
--- a/src/cmd/compile/internal/gc/order.go
+++ b/src/cmd/compile/internal/gc/order.go
@@ -336,7 +336,7 @@ func ismulticall(l *NodeList) bool {
 // Copyret emits t1, t2, ... = n, where n is a function call,
 // and then returns the list t1, t2, ....
 func copyret(n *Node, order *Order) *NodeList {
-	if n.Type.Etype != TSTRUCT || n.Type.Funarg == 0 {
+	if n.Type.Etype != TSTRUCT || !n.Type.Funarg {
 		Fatalf("copyret %v %d", n.Type, n.Left.Type.Outtuple)
 	}
 
diff --git a/src/cmd/compile/internal/gc/pgen.go b/src/cmd/compile/internal/gc/pgen.go
index 5631d4e5ecb..9b3ef68207b 100644
--- a/src/cmd/compile/internal/gc/pgen.go
+++ b/src/cmd/compile/internal/gc/pgen.go
@@ -371,7 +371,7 @@ func compile(fn *Node) {
 	// set up domain for labels
 	clearlabels()
 
-	if Curfn.Type.Outnamed != 0 {
+	if Curfn.Type.Outnamed {
 		// add clearing of the output parameters
 		var save Iter
 		t := Structfirst(&save, Getoutarg(Curfn.Type))
diff --git a/src/cmd/compile/internal/gc/reflect.go b/src/cmd/compile/internal/gc/reflect.go
index b36df0f421e..f579ef83a62 100644
--- a/src/cmd/compile/internal/gc/reflect.go
+++ b/src/cmd/compile/internal/gc/reflect.go
@@ -192,7 +192,7 @@ func mapbucket(t *Type) *Type {
 	field = append(field, ovf)
 
 	// link up fields
-	bucket.Noalg = 1
+	bucket.Noalg = true
 	bucket.Local = t.Local
 	bucket.Type = field[0]
 	for n := int32(0); n < int32(len(field)-1); n++ {
@@ -232,7 +232,7 @@ func hmap(t *Type) *Type {
 	field[7] = makefield("overflow", Types[TUNSAFEPTR])
 
 	h := typ(TSTRUCT)
-	h.Noalg = 1
+	h.Noalg = true
 	h.Local = t.Local
 	h.Type = field[0]
 	for n := int32(0); n < int32(len(field)-1); n++ {
@@ -284,7 +284,7 @@ func hiter(t *Type) *Type {
 	// build iterator struct holding the above fields
 	i := typ(TSTRUCT)
 
-	i.Noalg = 1
+	i.Noalg = true
 	i.Type = field[0]
 	for n := int32(0); n < int32(len(field)-1); n++ {
 		field[n].Down = field[n+1]
diff --git a/src/cmd/compile/internal/gc/reg.go b/src/cmd/compile/internal/gc/reg.go
index 388d713171e..b3e96216bdb 100644
--- a/src/cmd/compile/internal/gc/reg.go
+++ b/src/cmd/compile/internal/gc/reg.go
@@ -1289,12 +1289,12 @@ loop2:
 		for z := 0; z < BITS; z++ {
 			bit.b[z] = (r.refahead.b[z] | r.calahead.b[z]) &^ (externs.b[z] | params.b[z] | addrs.b[z] | consts.b[z])
 		}
-		if bany(&bit) && f.Refset == 0 {
+		if bany(&bit) && !f.Refset {
 			// should never happen - all variables are preset
 			if Debug['w'] != 0 {
 				fmt.Printf("%v: used and not set: %v\n", f.Prog.Line(), &bit)
 			}
-			f.Refset = 1
+			f.Refset = true
 		}
 	}
 
@@ -1309,11 +1309,11 @@ loop2:
 		for z := 0; z < BITS; z++ {
 			bit.b[z] = r.set.b[z] &^ (r.refahead.b[z] | r.calahead.b[z] | addrs.b[z])
 		}
-		if bany(&bit) && f.Refset == 0 {
+		if bany(&bit) && !f.Refset {
 			if Debug['w'] != 0 {
 				fmt.Printf("%v: set and not used: %v\n", f.Prog.Line(), &bit)
 			}
-			f.Refset = 1
+			f.Refset = true
 			Thearch.Excise(f)
 		}
 
diff --git a/src/cmd/compile/internal/gc/select.go b/src/cmd/compile/internal/gc/select.go
index 9e75198b7ca..83f53c1de18 100644
--- a/src/cmd/compile/internal/gc/select.go
+++ b/src/cmd/compile/internal/gc/select.go
@@ -335,7 +335,7 @@ func selecttype(size int32) *Type {
 	sudog.List = list(sudog.List, Nod(ODCLFIELD, newname(Lookup("nrelease")), typenod(Types[TINT32])))
 	sudog.List = list(sudog.List, Nod(ODCLFIELD, newname(Lookup("waitlink")), typenod(Ptrto(Types[TUINT8]))))
 	typecheck(&sudog, Etype)
-	sudog.Type.Noalg = 1
+	sudog.Type.Noalg = true
 	sudog.Type.Local = true
 
 	scase := Nod(OTSTRUCT, nil, nil)
@@ -347,7 +347,7 @@ func selecttype(size int32) *Type {
 	scase.List = list(scase.List, Nod(ODCLFIELD, newname(Lookup("receivedp")), typenod(Ptrto(Types[TUINT8]))))
 	scase.List = list(scase.List, Nod(ODCLFIELD, newname(Lookup("releasetime")), typenod(Types[TUINT64])))
 	typecheck(&scase, Etype)
-	scase.Type.Noalg = 1
+	scase.Type.Noalg = true
 	scase.Type.Local = true
 
 	sel := Nod(OTSTRUCT, nil, nil)
@@ -362,7 +362,7 @@ func selecttype(size int32) *Type {
 	arr = Nod(OTARRAY, Nodintconst(int64(size)), typenod(Types[TUINT16]))
 	sel.List = list(sel.List, Nod(ODCLFIELD, newname(Lookup("pollorderarr")), arr))
 	typecheck(&sel, Etype)
-	sel.Type.Noalg = 1
+	sel.Type.Noalg = true
 	sel.Type.Local = true
 
 	return sel.Type
diff --git a/src/cmd/compile/internal/gc/subr.go b/src/cmd/compile/internal/gc/subr.go
index 5cb75479d1d..df5e398a517 100644
--- a/src/cmd/compile/internal/gc/subr.go
+++ b/src/cmd/compile/internal/gc/subr.go
@@ -429,7 +429,7 @@ func algtype1(t *Type, bad **Type) int {
 	if t.Broke {
 		return AMEM
 	}
-	if t.Noalg != 0 {
+	if t.Noalg {
 		return ANOEQ
 	}
 
@@ -1385,7 +1385,7 @@ func substAny(tp **Type, types *[]*Type) {
 		if t == nil {
 			return
 		}
-		if t.Etype == TANY && t.Copyany != 0 {
+		if t.Etype == TANY && t.Copyany {
 			if len(*types) == 0 {
 				Fatalf("substArgTypes: not enough argument types")
 			}
@@ -1486,7 +1486,7 @@ func deep(t *Type) *Type {
 
 	case TANY:
 		nt = shallow(t)
-		nt.Copyany = 1
+		nt.Copyany = true
 
 	case TPTR32, TPTR64, TCHAN, TARRAY:
 		nt = shallow(t)
diff --git a/src/cmd/compile/internal/gc/typecheck.go b/src/cmd/compile/internal/gc/typecheck.go
index 68071c409f9..314c3a91a6e 100644
--- a/src/cmd/compile/internal/gc/typecheck.go
+++ b/src/cmd/compile/internal/gc/typecheck.go
@@ -1621,7 +1621,7 @@ OpSwitch:
 
 		// Unpack multiple-return result before type-checking.
 		var funarg *Type
-		if Istype(t, TSTRUCT) && t.Funarg != 0 {
+		if Istype(t, TSTRUCT) && t.Funarg {
 			funarg = t
 			t = t.Type.Type
 		}
@@ -2117,7 +2117,7 @@ OpSwitch:
 			return
 		}
 
-		if Curfn.Type.Outnamed != 0 && n.List == nil {
+		if Curfn.Type.Outnamed && n.List == nil {
 			break OpSwitch
 		}
 		typecheckaste(ORETURN, nil, false, getoutargx(Curfn.Type), n.List, func() string { return "return argument" })
@@ -2173,7 +2173,7 @@ OpSwitch:
 	}
 
 	t := n.Type
-	if t != nil && t.Funarg == 0 && n.Op != OTYPE {
+	if t != nil && !t.Funarg && n.Op != OTYPE {
 		switch t.Etype {
 		case TFUNC, // might have TANY; wait until its called
 			TANY,
@@ -2635,7 +2635,7 @@ func typecheckaste(op int, call *Node, isddd bool, tstruct *Type, nl *NodeList,
 	if nl != nil && nl.Next == nil {
 		n = nl.N
 		if n.Type != nil {
-			if n.Type.Etype == TSTRUCT && n.Type.Funarg != 0 {
+			if n.Type.Etype == TSTRUCT && n.Type.Funarg {
 				if !hasddd(tstruct) {
 					n1 := downcount(tstruct)
 					n2 := downcount(n.Type)
@@ -3375,7 +3375,7 @@ func typecheckas2(n *Node) {
 		}
 		switch r.Op {
 		case OCALLMETH, OCALLINTER, OCALLFUNC:
-			if r.Type.Etype != TSTRUCT || r.Type.Funarg == 0 {
+			if r.Type.Etype != TSTRUCT || !r.Type.Funarg {
 				break
 			}
 			cr = structcount(r.Type)
@@ -3559,8 +3559,8 @@ func copytype(n *Node, t *Type) {
 	t.Method = nil
 	t.Xmethod = nil
 	t.Nod = nil
-	t.Printed = 0
-	t.Deferwidth = 0
+	t.Printed = false
+	t.Deferwidth = false
 	t.Copyto = nil
 
 	// Update nodes waiting on this type.
diff --git a/src/cmd/compile/internal/gc/walk.go b/src/cmd/compile/internal/gc/walk.go
index 4a79b6609ea..ae19e6fda58 100644
--- a/src/cmd/compile/internal/gc/walk.go
+++ b/src/cmd/compile/internal/gc/walk.go
@@ -283,7 +283,7 @@ func walkstmt(np **Node) {
 		if n.List == nil {
 			break
 		}
-		if (Curfn.Type.Outnamed != 0 && count(n.List) > 1) || paramoutheap(Curfn) {
+		if (Curfn.Type.Outnamed && count(n.List) > 1) || paramoutheap(Curfn) {
 			// assign to the function out parameters,
 			// so that reorder3 can fix up conflicts
 			var rl *NodeList
@@ -1900,7 +1900,7 @@ func ascompatte(op int, call *Node, isddd bool, nl **Type, lr *NodeList, fp int,
 	var l2 string
 	var ll *Type
 	var l1 string
-	if r != nil && lr.Next == nil && r.Type.Etype == TSTRUCT && r.Type.Funarg != 0 {
+	if r != nil && lr.Next == nil && r.Type.Etype == TSTRUCT && r.Type.Funarg {
 		// optimization - can do block copy
 		if eqtypenoname(r.Type, *nl) {
 			a := nodarg(*nl, fp)