Improved separation of concerns

src/build/z/RegisterNumber.go

@@ -0,0 +1,20 @@
+package z
+
+import (
+	"git.akyoto.dev/cli/q/src/build/asm"
+	"git.akyoto.dev/cli/q/src/build/cpu"
+)
+
+func (f *Compiler) RegisterNumber(mnemonic asm.Mnemonic, a cpu.Register, b int) {
+	if f.CurrentScope().IsUsed(a) && isDestructive(mnemonic) {
+		f.SaveRegister(a)
+	}
+
+	f.Assembler.RegisterNumber(mnemonic, a, b)
+
+	if mnemonic == asm.MOVE {
+		f.CurrentScope().Use(a)
+	}
+
+	f.postInstruction()
+}