1 files changed, 50 insertions, 0 deletions
diff --git a/src/zig_llvm.cpp b/src/zig_llvm.cpp
index 852475c3c4..7ecb717047 100644
--- a/src/zig_llvm.cpp
+++ b/src/zig_llvm.cpp
@@ -1096,6 +1096,56 @@ bool ZigLLDLink(ZigLLVM_ObjectFormatType oformat, const char **args, size_t arg_
     abort();
 }
 
+static AtomicRMWInst::BinOp toLLVMRMWBinOp(enum ZigLLVM_AtomicRMWBinOp BinOp) {
+    switch (BinOp) {
+        default:
+        case ZigLLVMAtomicRMWBinOpXchg: return AtomicRMWInst::Xchg;
+        case ZigLLVMAtomicRMWBinOpAdd: return AtomicRMWInst::Add;
+        case ZigLLVMAtomicRMWBinOpSub: return AtomicRMWInst::Sub;
+        case ZigLLVMAtomicRMWBinOpAnd: return AtomicRMWInst::And;
+        case ZigLLVMAtomicRMWBinOpNand: return AtomicRMWInst::Nand;
+        case ZigLLVMAtomicRMWBinOpOr: return AtomicRMWInst::Or;
+        case ZigLLVMAtomicRMWBinOpXor: return AtomicRMWInst::Xor;
+        case ZigLLVMAtomicRMWBinOpMax: return AtomicRMWInst::Max;
+        case ZigLLVMAtomicRMWBinOpMin: return AtomicRMWInst::Min;
+        case ZigLLVMAtomicRMWBinOpUMax: return AtomicRMWInst::UMax;
+        case ZigLLVMAtomicRMWBinOpUMin: return AtomicRMWInst::UMin;
+        case ZigLLVMAtomicRMWBinOpFAdd: return AtomicRMWInst::FAdd;
+        case ZigLLVMAtomicRMWBinOpFSub: return AtomicRMWInst::FSub;
+    }
+}
+
+static AtomicOrdering toLLVMOrdering(LLVMAtomicOrdering Ordering) {
+    switch (Ordering) {
+        default:
+        case LLVMAtomicOrderingNotAtomic: return AtomicOrdering::NotAtomic;
+        case LLVMAtomicOrderingUnordered: return AtomicOrdering::Unordered;
+        case LLVMAtomicOrderingMonotonic: return AtomicOrdering::Monotonic;
+        case LLVMAtomicOrderingAcquire: return AtomicOrdering::Acquire;
+        case LLVMAtomicOrderingRelease: return AtomicOrdering::Release;
+        case LLVMAtomicOrderingAcquireRelease: return AtomicOrdering::AcquireRelease;
+        case LLVMAtomicOrderingSequentiallyConsistent: return AtomicOrdering::SequentiallyConsistent;
+    }
+}
+
+inline LLVMAttributeRef wrap(Attribute Attr) {
+    return reinterpret_cast<LLVMAttributeRef>(Attr.getRawPointer());
+}
+
+inline Attribute unwrap(LLVMAttributeRef Attr) {
+    return Attribute::fromRawPointer(Attr);
+}
+
+LLVMValueRef ZigLLVMBuildAtomicRMW(LLVMBuilderRef B, enum ZigLLVM_AtomicRMWBinOp op,
+    LLVMValueRef PTR, LLVMValueRef Val,
+    LLVMAtomicOrdering ordering, LLVMBool singleThread) 
+{
+    AtomicRMWInst::BinOp intop = toLLVMRMWBinOp(op);
+    return wrap(unwrap(B)->CreateAtomicRMW(intop, unwrap(PTR),
+        unwrap(Val), toLLVMOrdering(ordering), 
+        singleThread ? SyncScope::SingleThread : SyncScope::System));
+}
+
 static_assert((Triple::ArchType)ZigLLVM_UnknownArch == Triple::UnknownArch, "");
 static_assert((Triple::ArchType)ZigLLVM_arm == Triple::arm, "");
 static_assert((Triple::ArchType)ZigLLVM_armeb == Triple::armeb, "");