[CUDA] Implemented __nvvm_atom_*_gen_* builtins.

[tra]

Summary

Implemented __nvvm_atom_*_gen_* builtins.

Integer variants are implmented as atomicrmw or cmpxchg instructions.

Atomic add for floating point (__nvvm_atom_add_gen_f()) is implemented as a call to an overloaded @llvm.nvvm.atomic.load.add.f32.xxx LVVM intrinsic.

[eliben]

lib/CodeGen/CGBuiltin.cpp

112

Don't really need the Result temporary here?

118

You can just "return RValue::get(MakeBinary...)" -- similarly to how it's done below, for consistency

165

Please document all function parameters in the comment (especially ReturnBool)

174

Would universal initialization be simpler here?

Value *Args[3] = {CGF.Builder.CreateBi......, CGF.EmitScalar...}

6865

I'm wondering if there's some unwritten rule saying that all target builtins should be crammed into a single file... It's closing in on 7KLOC now and no end in sight. Would it be very bad for NVPTX to have its own CGBuiltinNVPTX or something like that? Clang splits classes to multiple files (Sema, CodeGenFunction, etc) already...

Eric?

[tra]

Addressed Eli's comments.

lib/CodeGen/CGBuiltin.cpp

112

Done.

118

Done.

165

Done.

174

Args[1] creation is a two-step operation which gets in a way.

[eliben]

lib/CodeGen/CGBuiltin.cpp

174

You could obtain the type from Args[1] through the cast (getSrcTy) and avoid the awkward repeated assignment to Args[1].

But this isn't super important - up to you.

[eliben]

LGTM

I'd move the NVPTX builtin emission code to its own file unless others have strong objections, but looks good otherwise.

lib/CodeGen/CGBuiltin.cpp

192

I would just "return EmitFromInt" and "return CreateZExt" inside the if() and else, and avoid this temporary. Then the first builder call in each clause can be assigned to a more meaningful name ("Result" is very generic).

[tra]

Removed temp variable.

[tra]

lib/CodeGen/CGBuiltin.cpp

192

I've removed temp variable altogether and added comments explaining what the code does.

lib/CodeGen/CGBuiltin.cpp

if (ResultType->isPointerTy())
     return CGF.Builder.CreateIntToPtr(V, ResultType);
 
   assert(V->getType() == ResultType);
   return V;
 }
 
 /// Utility to insert an atomic instruction based on Instrinsic::ID
 /// and the expression node.
-static RValue EmitBinaryAtomic(CodeGenFunction &CGF,
+static Value *MakeBinaryAtomicValue(CodeGenFunction &CGF,
                                     llvm::AtomicRMWInst::BinOp Kind,
                                     const CallExpr *E) {
   QualType T = E->getType();
   assert(E->getArg(0)->getType()->isPointerType());
   assert(CGF.getContext().hasSameUnqualifiedType(T,
                                   E->getArg(0)->getType()->getPointeeType()));
   assert(CGF.getContext().hasSameUnqualifiedType(T, E->getArg(1)->getType()));
 
   llvm::Value *DestPtr = CGF.EmitScalarExpr(E->getArg(0));
   unsigned AddrSpace = DestPtr->getType()->getPointerAddressSpace();
 
   llvm::IntegerType *IntType =
     llvm::IntegerType::get(CGF.getLLVMContext(),
                            CGF.getContext().getTypeSize(T));
   llvm::Type *IntPtrType = IntType->getPointerTo(AddrSpace);
 
   llvm::Value *Args[2];
   Args[0] = CGF.Builder.CreateBitCast(DestPtr, IntPtrType);
   Args[1] = CGF.EmitScalarExpr(E->getArg(1));
   llvm::Type *ValueType = Args[1]->getType();
   Args[1] = EmitToInt(CGF, Args[1], T, IntType);
 
   llvm::Value *Result =
       CGF.Builder.CreateAtomicRMW(Kind, Args[0], Args[1],
                                   llvm::SequentiallyConsistent);
   Result = EmitFromInt(CGF, Result, T, ValueType);
+  return Result;
+}
+
+static RValue EmitBinaryAtomic(CodeGenFunction &CGF,
+                               llvm::AtomicRMWInst::BinOp Kind,
+                               const CallExpr *E) {
+  llvm::Value *Result = MakeBinaryAtomicValue(CGF, Kind, E);
   return RValue::get(Result);
 }
 
 /// Utility to insert an atomic instruction based Instrinsic::ID and
 /// the expression node, where the return value is the result of the
 /// operation.
 static RValue EmitBinaryAtomicPost(CodeGenFunction &CGF,
                                    llvm::AtomicRMWInst::BinOp Kind,
static RValue EmitBinaryAtomicPost(CodeGenFunction &CGF,
   Result = CGF.Builder.CreateBinOp(Op, Result, Args[1]);
   if (Invert)
     Result = CGF.Builder.CreateBinOp(llvm::Instruction::Xor, Result,
                                      llvm::ConstantInt::get(IntType, -1));
   Result = EmitFromInt(CGF, Result, T, ValueType);
   return RValue::get(Result);
 }
 
+/// Utility to insert an atomic cmpxchg instruction based
+/// Instrinsic::ID and the expression node, where the return value is
+/// the result of the operation.
+static Value *MakeAtomicCmpXchgValue(CodeGenFunction &CGF, const CallExpr *E,
+                                     bool ReturnBool) {
+  QualType T = ReturnBool ? E->getArg(1)->getType() : E->getType();
+  llvm::Value *DestPtr = CGF.EmitScalarExpr(E->getArg(0));
+  unsigned AddrSpace = DestPtr->getType()->getPointerAddressSpace();
+
+  llvm::IntegerType *IntType = llvm::IntegerType::get(
+      CGF.getLLVMContext(), CGF.getContext().getTypeSize(T));
+  llvm::Type *IntPtrType = IntType->getPointerTo(AddrSpace);
+
+  Value *Args[3];
+  Args[0] = CGF.Builder.CreateBitCast(DestPtr, IntPtrType);
+  Args[1] = CGF.EmitScalarExpr(E->getArg(1));
+  llvm::Type *ValueType = Args[1]->getType();
+  Args[1] = EmitToInt(CGF, Args[1], T, IntType);
+  Args[2] = EmitToInt(CGF, CGF.EmitScalarExpr(E->getArg(2)), T, IntType);
+
+  Value *Pair = CGF.Builder.CreateAtomicCmpXchg(Args[0], Args[1], Args[2],
+                                                llvm::SequentiallyConsistent,
+                                                llvm::SequentiallyConsistent);
+  Value *Result;
+  if (ReturnBool) {
+    Result = CGF.Builder.CreateExtractValue(Pair, 1);
+    // zext bool to int.
+    Result = CGF.Builder.CreateZExt(Result, CGF.ConvertType(E->getType()));
+  } else {
+    Result = CGF.Builder.CreateExtractValue(Pair, 0);
+    Result = EmitFromInt(CGF, Result, T, ValueType);
+  }
+  return Result;
+}
+
 /// EmitFAbs - Emit a call to @llvm.fabs().
 static Value *EmitFAbs(CodeGenFunction &CGF, Value *V) {
   Value *F = CGF.CGM.getIntrinsic(Intrinsic::fabs, V->getType());
   llvm::CallInst *Call = CGF.Builder.CreateCall(F, V);
   Call->setDoesNotAccessMemory();
   return Call;
 }
 
RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD,
   case Builtin::BI__sync_nand_and_fetch_16:
     return EmitBinaryAtomicPost(*this, llvm::AtomicRMWInst::Nand, E,
                                 llvm::Instruction::And, true);
 
   case Builtin::BI__sync_val_compare_and_swap_1:
   case Builtin::BI__sync_val_compare_and_swap_2:
   case Builtin::BI__sync_val_compare_and_swap_4:
   case Builtin::BI__sync_val_compare_and_swap_8:
-  case Builtin::BI__sync_val_compare_and_swap_16: {
-    QualType T = E->getType();
-    llvm::Value *DestPtr = EmitScalarExpr(E->getArg(0));
-    unsigned AddrSpace = DestPtr->getType()->getPointerAddressSpace();
-
-    llvm::IntegerType *IntType =
-      llvm::IntegerType::get(getLLVMContext(),
-                             getContext().getTypeSize(T));
-    llvm::Type *IntPtrType = IntType->getPointerTo(AddrSpace);
-
-    Value *Args[3];
-    Args[0] = Builder.CreateBitCast(DestPtr, IntPtrType);
-    Args[1] = EmitScalarExpr(E->getArg(1));
-    llvm::Type *ValueType = Args[1]->getType();
-    Args[1] = EmitToInt(*this, Args[1], T, IntType);
-    Args[2] = EmitToInt(*this, EmitScalarExpr(E->getArg(2)), T, IntType);
-
-    Value *Result = Builder.CreateAtomicCmpXchg(Args[0], Args[1], Args[2],
-                                                llvm::SequentiallyConsistent,
-                                                llvm::SequentiallyConsistent);
-    Result = Builder.CreateExtractValue(Result, 0);
-    Result = EmitFromInt(*this, Result, T, ValueType);
-    return RValue::get(Result);
-  }
+  case Builtin::BI__sync_val_compare_and_swap_16:
+    return RValue::get(MakeAtomicCmpXchgValue(*this, E, false));
 
   case Builtin::BI__sync_bool_compare_and_swap_1:
   case Builtin::BI__sync_bool_compare_and_swap_2:
   case Builtin::BI__sync_bool_compare_and_swap_4:
   case Builtin::BI__sync_bool_compare_and_swap_8:
-  case Builtin::BI__sync_bool_compare_and_swap_16: {
-    QualType T = E->getArg(1)->getType();
-    llvm::Value *DestPtr = EmitScalarExpr(E->getArg(0));
-    unsigned AddrSpace = DestPtr->getType()->getPointerAddressSpace();
-
-    llvm::IntegerType *IntType =
-      llvm::IntegerType::get(getLLVMContext(),
-                             getContext().getTypeSize(T));
-    llvm::Type *IntPtrType = IntType->getPointerTo(AddrSpace);
-
-    Value *Args[3];
-    Args[0] = Builder.CreateBitCast(DestPtr, IntPtrType);
-    Args[1] = EmitToInt(*this, EmitScalarExpr(E->getArg(1)), T, IntType);
-    Args[2] = EmitToInt(*this, EmitScalarExpr(E->getArg(2)), T, IntType);
-
-    Value *Pair = Builder.CreateAtomicCmpXchg(Args[0], Args[1], Args[2],
-                                              llvm::SequentiallyConsistent,
-                                              llvm::SequentiallyConsistent);
-    Value *Result = Builder.CreateExtractValue(Pair, 1);
-    // zext bool to int.
-    Result = Builder.CreateZExt(Result, ConvertType(E->getType()));
-    return RValue::get(Result);
-  }
+  case Builtin::BI__sync_bool_compare_and_swap_16:
+    return RValue::get(MakeAtomicCmpXchgValue(*this, E, true));
 
   case Builtin::BI__sync_swap_1:
   case Builtin::BI__sync_swap_2:
   case Builtin::BI__sync_swap_4:
   case Builtin::BI__sync_swap_8:
   case Builtin::BI__sync_swap_16:
     return EmitBinaryAtomic(*this, llvm::AtomicRMWInst::Xchg, E);
 
Value *CodeGenFunction::EmitTargetBuiltinExpr(unsigned BuiltinID,
   case llvm::Triple::ppc64:
   case llvm::Triple::ppc64le:
     return EmitPPCBuiltinExpr(BuiltinID, E);
   case llvm::Triple::r600:
   case llvm::Triple::amdgcn:
     return EmitAMDGPUBuiltinExpr(BuiltinID, E);
   case llvm::Triple::systemz:
     return EmitSystemZBuiltinExpr(BuiltinID, E);
+  case llvm::Triple::nvptx:
+  case llvm::Triple::nvptx64:
+    return EmitNVPTXBuiltinExpr(BuiltinID, E);
   default:
     return nullptr;
   }
 }
 
 static llvm::VectorType *GetNeonType(CodeGenFunction *CGF,
                                      NeonTypeFlags TypeFlags,
                                      bool V1Ty=false) {
#define INTRINSIC_WITH_CC(NAME) \
   INTRINSIC_WITH_CC(s390_vftcidb);
 
 #undef INTRINSIC_WITH_CC
 
   default:
     return nullptr;
   }
 }
+
+Value *CodeGenFunction::EmitNVPTXBuiltinExpr(unsigned BuiltinID,
+                                             const CallExpr *E) {
+  switch (BuiltinID) {
+  case NVPTX::BI__nvvm_atom_add_gen_i:
+  case NVPTX::BI__nvvm_atom_add_gen_l:
+  case NVPTX::BI__nvvm_atom_add_gen_ll:
+    return MakeBinaryAtomicValue(*this, llvm::AtomicRMWInst::Add, E);
+
+  case NVPTX::BI__nvvm_atom_sub_gen_i:
+  case NVPTX::BI__nvvm_atom_sub_gen_l:
+  case NVPTX::BI__nvvm_atom_sub_gen_ll:
+    return MakeBinaryAtomicValue(*this, llvm::AtomicRMWInst::Sub, E);
+
+  case NVPTX::BI__nvvm_atom_and_gen_i:
+  case NVPTX::BI__nvvm_atom_and_gen_l:
+  case NVPTX::BI__nvvm_atom_and_gen_ll:
+    return MakeBinaryAtomicValue(*this, llvm::AtomicRMWInst::And, E);
+
+  case NVPTX::BI__nvvm_atom_or_gen_i:
+  case NVPTX::BI__nvvm_atom_or_gen_l:
+  case NVPTX::BI__nvvm_atom_or_gen_ll:
+    return MakeBinaryAtomicValue(*this, llvm::AtomicRMWInst::Or, E);
+
+  case NVPTX::BI__nvvm_atom_xor_gen_i:
+  case NVPTX::BI__nvvm_atom_xor_gen_l:
+  case NVPTX::BI__nvvm_atom_xor_gen_ll:
+    return MakeBinaryAtomicValue(*this, llvm::AtomicRMWInst::Xor, E);
+
+  case NVPTX::BI__nvvm_atom_xchg_gen_i:
+  case NVPTX::BI__nvvm_atom_xchg_gen_l:
+  case NVPTX::BI__nvvm_atom_xchg_gen_ll:
+    return MakeBinaryAtomicValue(*this, llvm::AtomicRMWInst::Xchg, E);
+
+  case NVPTX::BI__nvvm_atom_max_gen_i:
+  case NVPTX::BI__nvvm_atom_max_gen_l:
+  case NVPTX::BI__nvvm_atom_max_gen_ll:
+  case NVPTX::BI__nvvm_atom_max_gen_ui:
+  case NVPTX::BI__nvvm_atom_max_gen_ul:
+  case NVPTX::BI__nvvm_atom_max_gen_ull:
+    return MakeBinaryAtomicValue(*this, llvm::AtomicRMWInst::Max, E);
+
+  case NVPTX::BI__nvvm_atom_min_gen_i:
+  case NVPTX::BI__nvvm_atom_min_gen_l:
+  case NVPTX::BI__nvvm_atom_min_gen_ll:
+  case NVPTX::BI__nvvm_atom_min_gen_ui:
+  case NVPTX::BI__nvvm_atom_min_gen_ul:
+  case NVPTX::BI__nvvm_atom_min_gen_ull:
+    return MakeBinaryAtomicValue(*this, llvm::AtomicRMWInst::Min, E);
+
+  case NVPTX::BI__nvvm_atom_cas_gen_i:
+  case NVPTX::BI__nvvm_atom_cas_gen_l:
+  case NVPTX::BI__nvvm_atom_cas_gen_ll:
+    return MakeAtomicCmpXchgValue(*this, E, true);
+
+  case NVPTX::BI__nvvm_atom_add_gen_f: {
+    Value *Ptr = EmitScalarExpr(E->getArg(0));
+    Value *Val = EmitScalarExpr(E->getArg(1));
+    // atomicrmw only deals with integer arguments so we need to use
+    // LLVM's nvvm_atomic_load_add_f32 intrinsic for that.
+    Value *FnALAF32 =
+        CGM.getIntrinsic(Intrinsic::nvvm_atomic_load_add_f32, Ptr->getType());
+    return Builder.CreateCall(FnALAF32, {Ptr, Val});
+  }
+
+  default:
+    return nullptr;
+  }
+}

lib/CodeGen/CodeGenFunction.h

public:
   llvm::Value *vectorWrapScalar16(llvm::Value *Op);
   llvm::Value *EmitAArch64BuiltinExpr(unsigned BuiltinID, const CallExpr *E);
 
   llvm::Value *BuildVector(ArrayRef<llvm::Value*> Ops);
   llvm::Value *EmitX86BuiltinExpr(unsigned BuiltinID, const CallExpr *E);
   llvm::Value *EmitPPCBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
   llvm::Value *EmitAMDGPUBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
   llvm::Value *EmitSystemZBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
+  llvm::Value *EmitNVPTXBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
 
   llvm::Value *EmitObjCProtocolExpr(const ObjCProtocolExpr *E);
   llvm::Value *EmitObjCStringLiteral(const ObjCStringLiteral *E);
   llvm::Value *EmitObjCBoxedExpr(const ObjCBoxedExpr *E);
   llvm::Value *EmitObjCArrayLiteral(const ObjCArrayLiteral *E);
   llvm::Value *EmitObjCDictionaryLiteral(const ObjCDictionaryLiteral *E);
   llvm::Value *EmitObjCCollectionLiteral(const Expr *E,
                                 const ObjCMethodDecl *MethodWithObjects);

test/CodeGen/builtins-nvptx.c

 // REQUIRES: nvptx-registered-target
-// RUN: %clang_cc1 -triple nvptx-unknown-unknown -S -emit-llvm -o - %s | FileCheck %s
-// RUN: %clang_cc1 -triple nvptx64-unknown-unknown -S -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple nvptx-unknown-unknown -fcuda-is-device -S -emit-llvm -o - -x cuda %s | FileCheck %s
+// RUN: %clang_cc1 -triple nvptx64-unknown-unknown -fcuda-is-device -S -emit-llvm -o - -x cuda %s | FileCheck %s
 
-int read_tid() {
+#define __device__ __attribute__((device))
+#define __global__ __attribute__((global))
+#define __shared__ __attribute__((shared))
+#define __constant__ __attribute__((constant))
+
+__device__ int read_tid() {
 
 // CHECK: call i32 @llvm.ptx.read.tid.x()
 // CHECK: call i32 @llvm.ptx.read.tid.y()
 // CHECK: call i32 @llvm.ptx.read.tid.z()
 // CHECK: call i32 @llvm.ptx.read.tid.w()
 
   int x = __builtin_ptx_read_tid_x();
   int y = __builtin_ptx_read_tid_y();
   int z = __builtin_ptx_read_tid_z();
   int w = __builtin_ptx_read_tid_w();
 
   return x + y + z + w;
 
 }
 
-int read_ntid() {
+__device__ int read_ntid() {
 
 // CHECK: call i32 @llvm.ptx.read.ntid.x()
 // CHECK: call i32 @llvm.ptx.read.ntid.y()
 // CHECK: call i32 @llvm.ptx.read.ntid.z()
 // CHECK: call i32 @llvm.ptx.read.ntid.w()
 
   int x = __builtin_ptx_read_ntid_x();
   int y = __builtin_ptx_read_ntid_y();
   int z = __builtin_ptx_read_ntid_z();
   int w = __builtin_ptx_read_ntid_w();
 
   return x + y + z + w;
 
 }
 
-int read_ctaid() {
+__device__ int read_ctaid() {
 
 // CHECK: call i32 @llvm.ptx.read.ctaid.x()
 // CHECK: call i32 @llvm.ptx.read.ctaid.y()
 // CHECK: call i32 @llvm.ptx.read.ctaid.z()
 // CHECK: call i32 @llvm.ptx.read.ctaid.w()
 
   int x = __builtin_ptx_read_ctaid_x();
   int y = __builtin_ptx_read_ctaid_y();
   int z = __builtin_ptx_read_ctaid_z();
   int w = __builtin_ptx_read_ctaid_w();
 
   return x + y + z + w;
 
 }
 
-int read_nctaid() {
+__device__ int read_nctaid() {
 
 // CHECK: call i32 @llvm.ptx.read.nctaid.x()
 // CHECK: call i32 @llvm.ptx.read.nctaid.y()
 // CHECK: call i32 @llvm.ptx.read.nctaid.z()
 // CHECK: call i32 @llvm.ptx.read.nctaid.w()
 
   int x = __builtin_ptx_read_nctaid_x();
   int y = __builtin_ptx_read_nctaid_y();
   int z = __builtin_ptx_read_nctaid_z();
   int w = __builtin_ptx_read_nctaid_w();
 
   return x + y + z + w;
 
 }
 
-int read_ids() {
+__device__ int read_ids() {
 
 // CHECK: call i32 @llvm.ptx.read.laneid()
 // CHECK: call i32 @llvm.ptx.read.warpid()
 // CHECK: call i32 @llvm.ptx.read.nwarpid()
 // CHECK: call i32 @llvm.ptx.read.smid()
 // CHECK: call i32 @llvm.ptx.read.nsmid()
 // CHECK: call i32 @llvm.ptx.read.gridid()
 
   int a = __builtin_ptx_read_laneid();
   int b = __builtin_ptx_read_warpid();
   int c = __builtin_ptx_read_nwarpid();
   int d = __builtin_ptx_read_smid();
   int e = __builtin_ptx_read_nsmid();
   int f = __builtin_ptx_read_gridid();
 
   return a + b + c + d + e + f;
 
 }
 
-int read_lanemasks() {
+__device__ int read_lanemasks() {
 
 // CHECK: call i32 @llvm.ptx.read.lanemask.eq()
 // CHECK: call i32 @llvm.ptx.read.lanemask.le()
 // CHECK: call i32 @llvm.ptx.read.lanemask.lt()
 // CHECK: call i32 @llvm.ptx.read.lanemask.ge()
 // CHECK: call i32 @llvm.ptx.read.lanemask.gt()
 
   int a = __builtin_ptx_read_lanemask_eq();
   int b = __builtin_ptx_read_lanemask_le();
   int c = __builtin_ptx_read_lanemask_lt();
   int d = __builtin_ptx_read_lanemask_ge();
   int e = __builtin_ptx_read_lanemask_gt();
 
   return a + b + c + d + e;
 
 }
 
-
-long read_clocks() {
+__device__ long read_clocks() {
 
 // CHECK: call i32 @llvm.ptx.read.clock()
 // CHECK: call i64 @llvm.ptx.read.clock64()
 
   int a = __builtin_ptx_read_clock();
   long b = __builtin_ptx_read_clock64();
 
   return (long)a + b;
 
 }
 
-int read_pms() {
+__device__ int read_pms() {
 
 // CHECK: call i32 @llvm.ptx.read.pm0()
 // CHECK: call i32 @llvm.ptx.read.pm1()
 // CHECK: call i32 @llvm.ptx.read.pm2()
 // CHECK: call i32 @llvm.ptx.read.pm3()
 
   int a = __builtin_ptx_read_pm0();
   int b = __builtin_ptx_read_pm1();
   int c = __builtin_ptx_read_pm2();
   int d = __builtin_ptx_read_pm3();
 
   return a + b + c + d;
 
 }
 
-void sync() {
+__device__ void sync() {
 
 // CHECK: call void @llvm.ptx.bar.sync(i32 0)
 
   __builtin_ptx_bar_sync(0);
 
 }
 
 
 // NVVM intrinsics
 
 // The idea is not to test all intrinsics, just that Clang is recognizing the
 // builtins defined in BuiltinsNVPTX.def
-void nvvm_math(float f1, float f2, double d1, double d2) {
+__device__ void nvvm_math(float f1, float f2, double d1, double d2) {
 // CHECK: call float @llvm.nvvm.fmax.f
   float t1 = __nvvm_fmax_f(f1, f2);
 // CHECK: call float @llvm.nvvm.fmin.f
   float t2 = __nvvm_fmin_f(f1, f2);
 // CHECK: call float @llvm.nvvm.sqrt.rn.f
   float t3 = __nvvm_sqrt_rn_f(f1);
 // CHECK: call float @llvm.nvvm.rcp.rn.f
   float t4 = __nvvm_rcp_rn_f(f2);
// CHECK: call void @llvm.nvvm.membar.cta()
   __nvvm_membar_cta();
 // CHECK: call void @llvm.nvvm.membar.gl()
   __nvvm_membar_gl();
 // CHECK: call void @llvm.nvvm.membar.sys()
   __nvvm_membar_sys();
 // CHECK: call void @llvm.nvvm.barrier0()
   __nvvm_bar0();
 }
+
+__device__ int di;
+__shared__ int si;
+__device__ long dl;
+__shared__ long sl;
+__device__ long long dll;
+__shared__ long long sll;
+
+// Check for atomic intrinsics
+// CHECK-LABEL: nvvm_atom
+__device__ void nvvm_atom(float *fp, float f, int *ip, int i, long *lp, long l,
+                          long long *llp, long long ll) {
+  // CHECK: atomicrmw add
+  __nvvm_atom_add_gen_i(ip, i);
+  // CHECK: atomicrmw add
+  __nvvm_atom_add_gen_l(&dl, l);
+  // CHECK: atomicrmw add
+  __nvvm_atom_add_gen_ll(&sll, ll);
+
+  // CHECK: atomicrmw sub
+  __nvvm_atom_sub_gen_i(ip, i);
+  // CHECK: atomicrmw sub
+  __nvvm_atom_sub_gen_l(&dl, l);
+  // CHECK: atomicrmw sub
+  __nvvm_atom_sub_gen_ll(&sll, ll);
+
+  // CHECK: atomicrmw and
+  __nvvm_atom_and_gen_i(ip, i);
+  // CHECK: atomicrmw and
+  __nvvm_atom_and_gen_l(&dl, l);
+  // CHECK: atomicrmw and
+  __nvvm_atom_and_gen_ll(&sll, ll);
+
+  // CHECK: atomicrmw or
+  __nvvm_atom_or_gen_i(ip, i);
+  // CHECK: atomicrmw or
+  __nvvm_atom_or_gen_l(&dl, l);
+  // CHECK: atomicrmw or
+  __nvvm_atom_or_gen_ll(&sll, ll);
+
+  // CHECK: atomicrmw xor
+  __nvvm_atom_xor_gen_i(ip, i);
+  // CHECK: atomicrmw xor
+  __nvvm_atom_xor_gen_l(&dl, l);
+  // CHECK: atomicrmw xor
+  __nvvm_atom_xor_gen_ll(&sll, ll);
+
+  // CHECK: atomicrmw xchg
+  __nvvm_atom_xchg_gen_i(ip, i);
+  // CHECK: atomicrmw xchg
+  __nvvm_atom_xchg_gen_l(&dl, l);
+  // CHECK: atomicrmw xchg
+  __nvvm_atom_xchg_gen_ll(&sll, ll);
+
+  // CHECK: atomicrmw max
+  __nvvm_atom_max_gen_i(ip, i);
+  // CHECK: atomicrmw max
+  __nvvm_atom_max_gen_ui((unsigned int *)ip, i);
+  // CHECK: atomicrmw max
+  __nvvm_atom_max_gen_l(&dl, l);
+  // CHECK: atomicrmw max
+  __nvvm_atom_max_gen_ul((unsigned long *)&dl, l);
+  // CHECK: atomicrmw max
+  __nvvm_atom_max_gen_ll(&sll, ll);
+  // CHECK: atomicrmw max
+  __nvvm_atom_max_gen_ull((unsigned long long *)&sll, ll);
+
+  // CHECK: atomicrmw min
+  __nvvm_atom_min_gen_i(ip, i);
+  // CHECK: atomicrmw min
+  __nvvm_atom_min_gen_ui((unsigned int *)ip, i);
+  // CHECK: atomicrmw min
+  __nvvm_atom_min_gen_l(&dl, l);
+  // CHECK: atomicrmw min
+  __nvvm_atom_min_gen_ul((unsigned long *)&dl, l);
+  // CHECK: atomicrmw min
+  __nvvm_atom_min_gen_ll(&sll, ll);
+  // CHECK: atomicrmw min
+  __nvvm_atom_min_gen_ull((unsigned long long *)&sll, ll);
+
+  // CHECK: cmpxchg
+  __nvvm_atom_cas_gen_i(ip, 0, i);
+  // CHECK: cmpxchg
+  __nvvm_atom_cas_gen_l(&dl, 0, l);
+  // CHECK: cmpxchg
+  __nvvm_atom_cas_gen_ll(&sll, 0, ll);
+
+  // CHECK: call float @llvm.nvvm.atomic.load.add.f32.p0f32
+  __nvvm_atom_add_gen_f(fp, f);
+
+  // CHECK: ret
+}