IRBuilder: Add overload for intrinsics without args

llvm-svn: 333443

3 files changed, 17 insertions, 0 deletions

diff --git a/llvm/include/llvm/IR/IRBuilder.h b/llvm/include/llvm/IR/IRBuilder.h
index ce1ecde46ad..f9bb3a983be 100644
--- a/llvm/include/llvm/IR/IRBuilder.h
+++ b/llvm/include/llvm/IR/IRBuilder.h
@@ -632,6 +632,11 @@ public:
                                   Value *LHS, Value *RHS,
                                   const Twine &Name = "");
 
+  /// Create a call to intrinsic \p ID with no operands.
+  CallInst *CreateIntrinsic(Intrinsic::ID ID,
+                            Instruction *FMFSource = nullptr,
+                            const Twine &Name = "");
+
   /// Create a call to intrinsic \p ID with 1 or more operands assuming the
   /// intrinsic and all operands have the same type. If \p FMFSource is
   /// provided, copy fast-math-flags from that instruction to the intrinsic.
diff --git a/llvm/lib/IR/IRBuilder.cpp b/llvm/lib/IR/IRBuilder.cpp
index 71bdc35d4c1..f80be2d1b72 100644
--- a/llvm/lib/IR/IRBuilder.cpp
+++ b/llvm/lib/IR/IRBuilder.cpp
@@ -669,6 +669,14 @@ CallInst *IRBuilderBase::CreateBinaryIntrinsic(Intrinsic::ID ID,
 }
 
 CallInst *IRBuilderBase::CreateIntrinsic(Intrinsic::ID ID,
+                                         Instruction *FMFSource,
+                                         const Twine &Name) {
+  Module *M = BB->getModule();
+  Function *Fn = Intrinsic::getDeclaration(M, ID);
+  return createCallHelper(Fn, {}, this, Name);
+}
+
+CallInst *IRBuilderBase::CreateIntrinsic(Intrinsic::ID ID,
                                          ArrayRef<Value *> Args,
                                          Instruction *FMFSource,
                                          const Twine &Name) {
diff --git a/llvm/unittests/IR/IRBuilderTest.cpp b/llvm/unittests/IR/IRBuilderTest.cpp
index 6a3d121552d..3e032751692 100644
--- a/llvm/unittests/IR/IRBuilderTest.cpp
+++ b/llvm/unittests/IR/IRBuilderTest.cpp
@@ -63,6 +63,10 @@ TEST_F(IRBuilderTest, Intrinsics) {
   Call = Builder.CreateMaxNum(V, V);
   II = cast<IntrinsicInst>(Call);
   EXPECT_EQ(II->getIntrinsicID(), Intrinsic::maxnum);
+
+  Call = Builder.CreateIntrinsic(Intrinsic::readcyclecounter);
+  II = cast<IntrinsicInst>(Call);
+  EXPECT_EQ(II->getIntrinsicID(), Intrinsic::readcyclecounter);
 }
 
 TEST_F(IRBuilderTest, Lifetime) {