cmd/internal/gc: convert Bval to bool

No functional changes. Passes toolstash -cmp.

Change-Id: I4fba0c248645c3910ee3f7fc99dacafb676c5dc2
Reviewed-on: https://go-review.googlesource.com/8911Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/7g/gsubr.go

@@ -447,7 +447,7 @@ func intLiteral(n *gc.Node) (x int64, ok bool) {
 	case gc.CTINT, gc.CTRUNE:
 		return gc.Mpgetfix(n.Val.U.Xval), true
 	case gc.CTBOOL:
-		return int64(n.Val.U.Bval), true
+		return int64(bool2int(n.Val.U.Bval)), true
 	}
 	return
 }

src/cmd/9g/gsubr.go

@@ -526,7 +526,7 @@ func intLiteral(n *gc.Node) (x int64, ok bool) {
 	case gc.CTINT, gc.CTRUNE:
 		return gc.Mpgetfix(n.Val.U.Xval), true
 	case gc.CTBOOL:
-		return int64(n.Val.U.Bval), true
+		return int64(bool2int(n.Val.U.Bval)), true
 	}
 	return
 }

src/cmd/internal/gc/cgen.go

@@ -1690,7 +1690,7 @@ func Bgen(n *Node, true_ bool, likely int, to *obj.Prog) {
 
 		// need to ask if it is bool?
 	case OLITERAL:
-		if !true_ == (n.Val.U.Bval == 0) {
+		if true_ == n.Val.U.Bval {
 			Patch(Gbranch(obj.AJMP, nil, likely), to)
 		}
 		return

src/cmd/internal/gc/const.go

@@ -650,7 +650,7 @@ func evconst(n *Node) {
 			mpnegflt(&v.U.Cval.Imag)
 
 		case ONOT<<16 | CTBOOL:
-			if v.U.Bval == 0 {
+			if !v.U.Bval {
 				goto settrue
 			}
 			goto setfalse
@@ -990,13 +990,13 @@ func evconst(n *Node) {
 		goto setfalse
 
 	case OOROR<<16 | CTBOOL:
-		if v.U.Bval != 0 || rv.U.Bval != 0 {
+		if v.U.Bval || rv.U.Bval {
 			goto settrue
 		}
 		goto setfalse
 
 	case OANDAND<<16 | CTBOOL:
-		if v.U.Bval != 0 && rv.U.Bval != 0 {
+		if v.U.Bval && rv.U.Bval {
 			goto settrue
 		}
 		goto setfalse
@@ -1418,7 +1418,7 @@ func Convconst(con *Node, t *Type, val *Val) {
 			i = Mpgetfix(val.U.Xval)
 
 		case CTBOOL:
-			i = int64(val.U.Bval)
+			i = int64(bool2int(val.U.Bval))
 
 		case CTNIL:
 			i = 0

src/cmd/internal/gc/fmt.go

@@ -344,7 +344,7 @@ func Vconv(v *Val, flag int) string {
 		return strconv.Quote(v.U.Sval)
 
 	case CTBOOL:
-		if v.U.Bval != 0 {
+		if v.U.Bval {
 			return "true"
 		}
 		return "false"

src/cmd/internal/gc/go.go

@@ -85,7 +85,7 @@ type Val struct {
 	Ctype int16
 	U     struct {
 		Reg  int16   // OREGISTER
-		Bval int16   // bool value CTBOOL
+		Bval bool    // bool value CTBOOL
 		Xval *Mpint  // int CTINT, rune CTRUNE
 		Fval *Mpflt  // float CTFLT
 		Cval *Mpcplx // float CTCPLX

src/cmd/internal/gc/gsubr.go

@@ -417,7 +417,7 @@ func Naddr(a *obj.Addr, n *Node) {
 		case CTBOOL:
 			a.Sym = nil
 			a.Type = obj.TYPE_CONST
-			a.Offset = int64(n.Val.U.Bval)
+			a.Offset = int64(bool2int(n.Val.U.Bval))
 
 		case CTNIL:
 			a.Sym = nil

src/cmd/internal/gc/sinit.go

@@ -1363,7 +1363,7 @@ func iszero(n *Node) bool {
 			return n.Val.U.Sval == ""
 
 		case CTBOOL:
-			return n.Val.U.Bval == 0
+			return !n.Val.U.Bval
 
 		case CTINT, CTRUNE:
 			return mpcmpfixc(n.Val.U.Xval, 0) == 0

src/cmd/internal/gc/subr.go

@@ -710,7 +710,7 @@ func nodnil() *Node {
 func Nodbool(b bool) *Node {
 	c := Nodintconst(0)
 	c.Val.Ctype = CTBOOL
-	c.Val.U.Bval = int16(bool2int(b))
+	c.Val.U.Bval = b
 	c.Type = idealbool
 	return c
 }

src/cmd/internal/gc/swt.go

@@ -218,7 +218,7 @@ func (s *exprSwitch) walk(sw *Node) {
 	s.kind = switchKindExpr
 	if Isconst(sw.Ntest, CTBOOL) {
 		s.kind = switchKindTrue
-		if sw.Ntest.Val.U.Bval == 0 {
+		if !sw.Ntest.Val.U.Bval {
 			s.kind = switchKindFalse
 		}
 	}

src/cmd/internal/gc/typecheck.go

@@ -2826,12 +2826,12 @@ func keydup(n *Node, hash []*Node) {
 			if Eqtype(a.Left.Type, n.Type) {
 				cmp.Right = a.Left
 				evconst(&cmp)
-				b = uint32(cmp.Val.U.Bval)
+				b = uint32(bool2int(cmp.Val.U.Bval))
 			}
 		} else if Eqtype(a.Type, n.Type) {
 			cmp.Right = a
 			evconst(&cmp)
-			b = uint32(cmp.Val.U.Bval)
+			b = uint32(bool2int(cmp.Val.U.Bval))
 		}
 
 		if b != 0 {