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

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 6f8dfe9..eaf2e7d 100644 (file)
--- 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,

diff --git a/clang/test/Sema/atomic-ops.c b/clang/test/Sema/atomic-ops.c
index 2a93591..a33ff2b 100644 (file)
--- a/clang/test/Sema/atomic-ops.c
+++ b/clang/test/Sema/atomic-ops.c
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 %s -verify -fsyntax-only -triple=i686-linux-gnu -std=c11
+// RUN: %clang_cc1 %s -verify -fsyntax-only -triple=aarch64-linux-gnu -std=c11
 
 // Basic parsing/Sema tests for __c11_atomic_*
 
@@ -17,7 +18,11 @@ _Static_assert(__GCC_ATOMIC_WCHAR_T_LOCK_FREE == 2, "");
 _Static_assert(__GCC_ATOMIC_SHORT_LOCK_FREE == 2, "");
 _Static_assert(__GCC_ATOMIC_INT_LOCK_FREE == 2, "");
 _Static_assert(__GCC_ATOMIC_LONG_LOCK_FREE == 2, "");
+#ifdef __i386__
 _Static_assert(__GCC_ATOMIC_LLONG_LOCK_FREE == 1, "");
+#else
+_Static_assert(__GCC_ATOMIC_LLONG_LOCK_FREE == 2, "");
+#endif
 _Static_assert(__GCC_ATOMIC_POINTER_LOCK_FREE == 2, "");
 
 _Static_assert(__c11_atomic_is_lock_free(1), "");