Added x86 package

src/x86/Pop.go

@@ -0,0 +1,16 @@
+package x86
+
+import "git.urbach.dev/cli/q/src/cpu"
+
+// PopRegister pops a value from the stack and saves it into the register.
+func PopRegister(code []byte, register cpu.Register) []byte {
+	if register > 0b111 {
+		code = append(code, REX(0, 0, 0, 1))
+		register &= 0b111
+	}
+
+	return append(
+		code,
+		0x58+byte(register),
+	)
+}