From 847d2d454944bc56fccb8fbd344e91b6ec678a22 Mon Sep 17 00:00:00 2001
From: Tim Northover <Tim.Northover@arm.com>
Date: Mon, 18 Feb 2013 12:11:32 +0000
Subject: AArch64: add atomic support parameters to TargetInfo

This allows Clang to detect and deal wih __atomic_* operations properly on
AArch64. Previously we produced an error when encountering them at high
optimisation levels.

llvm-svn: 175438
---
 clang/lib/Basic/Targets.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'clang/lib/Basic/Targets.cpp')

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 6f8dfe9b65d..eaf2e7d05e6 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -3167,6 +3167,10 @@ public:
     WCharType = UnsignedInt;
     LongDoubleFormat = &llvm::APFloat::IEEEquad;
 
+    // AArch64 backend supports 64-bit operations at the moment. In principle
+    // 128-bit is possible if register-pairs are used.
+    MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 64;
+
     TheCXXABI.set(TargetCXXABI::GenericAArch64);
   }
   virtual void getTargetDefines(const LangOptions &Opts,
-- 
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