From fa63bce14d0b0586f04a42ba13a2a0546fed9503 Mon Sep 17 00:00:00 2001
From: Joshua Warner <joshua.warner@readytalk.com>
Date: Fri, 1 May 2015 13:44:44 -0600
Subject: [PATCH] don't use x18 on arm64, where it's a reserved 'platform'
 register

---
 src/codegen/target/arm/assembler.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/codegen/target/arm/assembler.cpp b/src/codegen/target/arm/assembler.cpp
index ab74b41d72..a72bd5edf5 100644
--- a/src/codegen/target/arm/assembler.cpp
+++ b/src/codegen/target/arm/assembler.cpp
@@ -237,6 +237,9 @@ class MyArchitecture : public Architecture {
     case ThreadRegister.index():
     case ProgramCounter.index():
       return true;
+    case 18:
+      // x18 is a reserved platform register on arm64
+      return TargetBytesPerWord == 8;
 
     default:
       return false;