printer: cleaner output

examples/complex/complex.s

@@ -6,11 +6,13 @@ TEXT ·Real(SB),0,$0-24
 	MOVSD	x_real(FP), X0
 	MOVSD	X0, ret+16(FP)
 	RET
+
 // func Imag(x complex128) float64
 TEXT ·Imag(SB),0,$0-24
 	MOVSD	x_imag+8(FP), X0
 	MOVSD	X0, ret+16(FP)
 	RET
+
 // func Norm(x complex128) float64
 TEXT ·Norm(SB),0,$0-24
 	MOVSD	x_real(FP), X0

examples/components/components.s

@@ -6,61 +6,73 @@ TEXT ·FieldByte(SB),0,$0-184
 	MOVB	s_Byte(FP), AL
 	MOVB	AL, ret+176(FP)
 	RET
+
 // func FieldInt8(s Struct) int8
 TEXT ·FieldInt8(SB),0,$0-184
 	MOVB	s_Int8+1(FP), AL
 	MOVB	AL, ret+176(FP)
 	RET
+
 // func FieldUint16(s Struct) uint16
 TEXT ·FieldUint16(SB),0,$0-184
 	MOVW	s_Uint16+2(FP), AX
 	MOVW	AX, ret+176(FP)
 	RET
+
 // func FieldInt32(s Struct) int32
 TEXT ·FieldInt32(SB),0,$0-184
 	MOVL	s_Int32+4(FP), AX
 	MOVL	AX, ret+176(FP)
 	RET
+
 // func FieldUint64(s Struct) uint64
 TEXT ·FieldUint64(SB),0,$0-184
 	MOVQ	s_Uint64+8(FP), AX
 	MOVQ	AX, ret+176(FP)
 	RET
+
 // func FieldFloat32(s Struct) float32
 TEXT ·FieldFloat32(SB),0,$0-184
 	MOVSS	s_Float32+16(FP), X0
 	MOVSS	X0, ret+176(FP)
 	RET
+
 // func FieldFloat64(s Struct) float64
 TEXT ·FieldFloat64(SB),0,$0-184
 	MOVSD	s_Float64+24(FP), X0
 	MOVSD	X0, ret+176(FP)
 	RET
+
 // func FieldStringLen(s Struct) int
 TEXT ·FieldStringLen(SB),0,$0-184
 	MOVQ	s_String_len+40(FP), AX
 	MOVQ	AX, ret+176(FP)
 	RET
+
 // func FieldSliceCap(s Struct) int
 TEXT ·FieldSliceCap(SB),0,$0-184
 	MOVQ	s_Slice_cap+64(FP), AX
 	MOVQ	AX, ret+176(FP)
 	RET
+
 // func FieldArrayTwoBTwo(s Struct) byte
 TEXT ·FieldArrayTwoBTwo(SB),0,$0-184
 	MOVB	s_Array_2_B_2+114(FP), AL
 	MOVB	AL, ret+176(FP)
 	RET
+
 // func FieldArrayOneC(s Struct) uint16
 TEXT ·FieldArrayOneC(SB),0,$0-184
 	MOVW	s_Array_1_C+100(FP), AX
 	MOVW	AX, ret+176(FP)
 	RET
+
 // func FieldComplex64Imag(s Struct) float32
 TEXT ·FieldComplex64Imag(SB),0,$0-184
 	MOVSS	s_Complex64_imag+156(FP), X0
 	MOVSS	X0, ret+176(FP)
 	RET
+
 // func FieldComplex128Real(s Struct) float64
 TEXT ·FieldComplex128Real(SB),0,$0-184
 	MOVSD	s_Complex128_real+160(FP), X0

printer/goasm.go

@@ -31,7 +31,6 @@ func (p *goasm) Print(f *avo.File) ([]byte, error) {
 func (p *goasm) header() {
 	p.NL()
 	p.include("textflag.h")
-	p.NL()
 }
 
 func (p *goasm) include(path string) {
@@ -39,13 +38,18 @@ func (p *goasm) include(path string) {
 }
 
 func (p *goasm) function(f *avo.Function) {
+	p.NL()
 	p.Comment(f.Stub())
 	p.Printf("TEXT %s%s(SB),0,$%d-%d\n", dot, f.Name, f.FrameBytes(), f.ArgumentBytes())
 
 	for _, node := range f.Nodes {
 		switch n := node.(type) {
 		case *avo.Instruction:
-			p.Printf("\t%s\t%s\n", n.Opcode, joinOperands(n.Operands))
+			if len(n.Operands) > 0 {
+				p.Printf("\t%s\t%s\n", n.Opcode, joinOperands(n.Operands))
+			} else {
+				p.Printf("\t%s\n", n.Opcode)
+			}
 		case avo.Label:
 			p.Printf("%s:\n", n)
 		default: