From 8f47e8feb60e60cc85674a9eef281197ed8a7c27 Mon Sep 17 00:00:00 2001
From: Jakub Konka <kubkon@jakubkonka.com>
Date: Mon, 16 Nov 2020 17:56:13 +0100
Subject: [PATCH] stage2 aarch64: add NOP instruction

---
 src/codegen/aarch64.zig | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/codegen/aarch64.zig b/src/codegen/aarch64.zig
index 925d3e122d..ab5b5da604 100644
--- a/src/codegen/aarch64.zig
+++ b/src/codegen/aarch64.zig
@@ -238,6 +238,9 @@ pub const Instruction = union(enum) {
         fixed: u5 = 0b00101,
         op: u1,
     },
+    NoOperation: packed struct {
+        fixed: u32 = 0b1101010100_0_00_011_0010_0000_000_11111,
+    },
 
     pub fn toU32(self: Instruction) u32 {
         return switch (self) {
@@ -247,6 +250,7 @@ pub const Instruction = union(enum) {
             .ExceptionGeneration => |v| @bitCast(u32, v),
             .UnconditionalBranchRegister => |v| @bitCast(u32, v),
             .UnconditionalBranchImmediate => |v| @bitCast(u32, v),
+            .NoOperation => |v| @bitCast(u32, v),
         };
     }
 
@@ -599,6 +603,12 @@ pub const Instruction = union(enum) {
     pub fn bl(offset: i28) Instruction {
         return unconditionalBranchImmediate(1, offset);
     }
+
+    // Nop
+
+    pub fn nop() Instruction {
+        return Instruction{ .NoOperation = {} };
+    }
 };
 
 test "" {