Add invariant start call creation in IRBuilder.NFC

Differential Revision: https://reviews.llvm.org/D22700

llvm-svn: 276471

1 files changed, 20 insertions, 0 deletions

diff --git a/llvm/lib/IR/IRBuilder.cpp b/llvm/lib/IR/IRBuilder.cpp
index 298331d51c8..d3e410d6d03 100644
--- a/llvm/lib/IR/IRBuilder.cpp
+++ b/llvm/lib/IR/IRBuilder.cpp
@@ -191,6 +191,26 @@ CallInst *IRBuilderBase::CreateLifetimeEnd(Value *Ptr, ConstantInt *Size) {
   return createCallHelper(TheFn, Ops, this);
 }
 
+CallInst *IRBuilderBase::CreateInvariantStart(Value *Ptr, ConstantInt *Size) {
+
+  assert(isa<PointerType>(Ptr->getType()) &&
+         "invariant.start only applies to pointers.");
+  Ptr = getCastedInt8PtrValue(Ptr);
+  if (!Size)
+    Size = getInt64(-1);
+  else
+    assert(Size->getType() == getInt64Ty() &&
+           "invariant.start requires the size to be an i64");
+
+  Value *Ops[] = {Size, Ptr};
+  // Fill in the single overloaded type: memory object type.
+  Type *ObjectPtr[1] = {Ptr->getType()};
+  Module *M = BB->getParent()->getParent();
+  Value *TheFn =
+      Intrinsic::getDeclaration(M, Intrinsic::invariant_start, ObjectPtr);
+  return createCallHelper(TheFn, Ops, this);
+}
+
 CallInst *IRBuilderBase::CreateAssumption(Value *Cond) {
   assert(Cond->getType() == getInt1Ty() &&
          "an assumption condition must be of type i1");