From fe8bbb2333108c3a7a922dbb44d23fc66c3f76ab Mon Sep 17 00:00:00 2001
From: Renato Golin <renato.golin@linaro.org>
Date: Thu, 22 Dec 2016 19:38:04 +0000
Subject: [PATCH] Revert "[XRay][AArch64] An attempt to fix test
 patching-unpatching.cc by flushing the instruction cache after code
 modification"

This reverts commit r290354, as it broke the build. We need to make sure
this builds on AArch64 before committing again.

llvm-svn: 290362
---
 compiler-rt/lib/xray/xray_AArch64.cc                         | 5 +----
 compiler-rt/test/xray/TestCases/Linux/patching-unpatching.cc | 1 +
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/compiler-rt/lib/xray/xray_AArch64.cc b/compiler-rt/lib/xray/xray_AArch64.cc
index 12b4a6fade99..8f24610dab27 100644
--- a/compiler-rt/lib/xray/xray_AArch64.cc
+++ b/compiler-rt/lib/xray/xray_AArch64.cc
@@ -75,8 +75,8 @@ inline static bool patchSled(const bool Enable, const uint32_t FuncId,
   //   B #32
 
   uint32_t *FirstAddress = reinterpret_cast<uint32_t *>(Sled.Address);
-  uint32_t *CurAddress = FirstAddress + 1;
   if (Enable) {
+    uint32_t *CurAddress = FirstAddress + 1;
     *CurAddress = uint32_t(PatchOpcodes::PO_LdrW0_12);
     CurAddress++;
     *CurAddress = uint32_t(PatchOpcodes::PO_LdrX16_12);
@@ -88,7 +88,6 @@ inline static bool patchSled(const bool Enable, const uint32_t FuncId,
     *reinterpret_cast<void (**)()>(CurAddress) = TracingHook;
     CurAddress += 2;
     *CurAddress = uint32_t(PatchOpcodes::PO_LdpX0X30SP_16);
-    CurAddress++;
     std::atomic_store_explicit(
         reinterpret_cast<std::atomic<uint32_t> *>(FirstAddress),
         uint32_t(PatchOpcodes::PO_StpX0X30SP_m16e), std::memory_order_release);
@@ -97,8 +96,6 @@ inline static bool patchSled(const bool Enable, const uint32_t FuncId,
         reinterpret_cast<std::atomic<uint32_t> *>(FirstAddress),
         uint32_t(PatchOpcodes::PO_B32), std::memory_order_release);
   }
-  __clear_cache(reinterpret_cast<char*>(FirstAddress),
-      reinterpret_cast<char*>(CurAddress));
   return true;
 }
 
diff --git a/compiler-rt/test/xray/TestCases/Linux/patching-unpatching.cc b/compiler-rt/test/xray/TestCases/Linux/patching-unpatching.cc
index 05478a488056..e684e427f068 100644
--- a/compiler-rt/test/xray/TestCases/Linux/patching-unpatching.cc
+++ b/compiler-rt/test/xray/TestCases/Linux/patching-unpatching.cc
@@ -3,6 +3,7 @@
 //
 // RUN: %clangxx_xray -fxray-instrument -std=c++11 %s -o %t
 // RUN: XRAY_OPTIONS="patch_premain=false" %run %t 2>&1 | FileCheck %s
+// REQUIRES: stable-runtime
 
 #include "xray/xray_interface.h"