[X86] Only define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 in 64-bit mode.

Summary:
This define should correspond to CMPXCHG16B being available which requires 64-bit mode.

I checked and gcc also seems to only define this in 64-bit mode.

Reviewers: RKSimon, spatel, efriedma, jyknight, jfb

Reviewed By: jfb

Subscribers: jfb, cfe-commits, llvm-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D59287

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@356118 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Basic/Targets/X86.cpp

@@ -1280,7 +1280,7 @@ void X86TargetInfo::getTargetDefines(const LangOptions &Opts,
   }
   if (CPU >= CK_i586)
     Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8");
-  if (HasCX16)
+  if (HasCX16 && getTriple().getArch() == llvm::Triple::x86_64)
     Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_16");
 
   if (HasFloat128)

test/Preprocessor/x86_target_features.c

@@ -348,9 +348,13 @@
 
 // NOTBM-NOT: #define __TBM__ 1
 
-// RUN: %clang -target i386-unknown-unknown -march=pentiumpro -mcx16 -x c -E -dM -o - %s | FileCheck -match-full-lines --check-prefix=MCX16 %s
+// RUN: %clang -target i386-unknown-unknown -march=pentiumpro -mcx16 -x c -E -dM -o - %s | FileCheck -match-full-lines --check-prefix=MCX16-32 %s
 
-// MCX16: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 1
+// MCX16-32-NOT: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 1
+
+// RUN: %clang -target x86_64-unknown-unknown -march=x86-64 -mcx16 -x c -E -dM -o - %s | FileCheck -match-full-lines --check-prefix=MCX16-64 %s
+
+// MCX16-64: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 1
 
 // RUN: %clang -target i386-unknown-unknown -march=atom -mprfchw -x c -E -dM -o - %s | FileCheck -match-full-lines --check-prefix=PRFCHW %s