NFC: unify clang / LLVM atomic ordering

This makes the C11 / C++11 *ABI* atomic ordering accessible from LLVM,
as discussed in http://reviews.llvm.org/D18200#inline-151433

This re-applies r266574 which I had reverted in r266575.

Depends on http://reviews.llvm.org/D18875

Original review: http://reviews.llvm.org/D18876

llvm-svn: 266641

1 files changed, 7 insertions, 7 deletions

diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 6047030129a..b50869384ed 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -1791,10 +1791,10 @@ bool Sema::CheckOtherCall(CallExpr *TheCall, const FunctionProtoType *Proto) {
 }
 
 static bool isValidOrderingForOp(int64_t Ordering, AtomicExpr::AtomicOp Op) {
-  if (Ordering < AtomicExpr::AO_ABI_memory_order_relaxed ||
-      Ordering > AtomicExpr::AO_ABI_memory_order_seq_cst)
+  if (!llvm::isValidAtomicOrderingCABI(Ordering))
     return false;
 
+  auto OrderingCABI = (llvm::AtomicOrderingCABI)Ordering;
   switch (Op) {
   case AtomicExpr::AO__c11_atomic_init:
     llvm_unreachable("There is no ordering argument for an init");
@@ -1802,15 +1802,15 @@ static bool isValidOrderingForOp(int64_t Ordering, AtomicExpr::AtomicOp Op) {
   case AtomicExpr::AO__c11_atomic_load:
   case AtomicExpr::AO__atomic_load_n:
   case AtomicExpr::AO__atomic_load:
-    return Ordering != AtomicExpr::AO_ABI_memory_order_release &&
-           Ordering != AtomicExpr::AO_ABI_memory_order_acq_rel;
+    return OrderingCABI != llvm::AtomicOrderingCABI::release &&
+           OrderingCABI != llvm::AtomicOrderingCABI::acq_rel;
 
   case AtomicExpr::AO__c11_atomic_store:
   case AtomicExpr::AO__atomic_store:
   case AtomicExpr::AO__atomic_store_n:
-    return Ordering != AtomicExpr::AO_ABI_memory_order_consume &&
-           Ordering != AtomicExpr::AO_ABI_memory_order_acquire &&
-           Ordering != AtomicExpr::AO_ABI_memory_order_acq_rel;
+    return OrderingCABI != llvm::AtomicOrderingCABI::consume &&
+           OrderingCABI != llvm::AtomicOrderingCABI::acquire &&
+           OrderingCABI != llvm::AtomicOrderingCABI::acq_rel;
 
   default:
     return true;