Flattened package hierarchy

src/x64/SIB.go

@@ -0,0 +1,19 @@
+package x64
+
+// ScaleFactor encodes the scale factor.
+type ScaleFactor = byte
+
+const (
+	Scale1 = ScaleFactor(0b00)
+	Scale2 = ScaleFactor(0b01)
+	Scale4 = ScaleFactor(0b10)
+	Scale8 = ScaleFactor(0b11)
+)
+
+// SIB is used to generate an SIB byte.
+// - scale: 2 bits. Multiplies the value of the index.
+// - index: 3 bits. Specifies the index register.
+// - base:  3 bits. Specifies the base register.
+func SIB(scale ScaleFactor, index byte, base byte) byte {
+	return (scale << 6) | (index << 3) | base
+}