+Arguments:
+""""""""""
+
+The ``llvm.stackprotectorcheck`` intrinsic requires one pointer argument, the
+the variable ``@__stack_chk_guard``.
+
+Semantics:
+""""""""""
+
+This intrinsic is provided to perform the stack protector check by comparing
+``guard`` with the stack slot created by ``llvm.stackprotector`` and if the
+values do not match call the ``__stack_chk_fail()`` function.
+
+The reason to provide this as an IR level intrinsic instead of implementing it
+via other IR operations is that in order to perform this operation at the IR
+level without an intrinsic, one would need to create additional basic blocks to
+handle the success/failure cases. This makes it difficult to stop the stack
+protector check from disrupting sibling tail calls in Codegen. With this
+intrinsic, we are able to generate the stack protector basic blocks late in
+codegen after the tail call decision has occured.
+