[llvm] [IR] Initial introduction of memset_pattern (PR #97583)

[Alex Bradbury via llvm-commits]

================
@@ -15230,6 +15230,62 @@ The behavior of '``llvm.memset.inline.*``' is equivalent to the behavior of
 '``llvm.memset.*``', but the generated code is guaranteed not to call any
 external functions.
 
+.. _int_memset_pattern:
+
+'``llvm.memset_pattern``' Intrinsic
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+This is an overloaded intrinsic. You can use ``llvm.memset_pattern`` on
+any integer bit width and for different address spaces. Not all targets
+support all bit widths however.
+
+::
+
+      declare void @llvm.memset_pattern.p0.i64.i128(ptr <dest>, i128 <val>,
+                                                    i64 <len>, i1 <isvolatile>)
+
+Overview:
+"""""""""
+
+The '``llvm.memset_pattern.*``' intrinsics fill a block of memory with
+a particular value. This may be expanded to an inline loop, a sequence of
+stores, or a libcall depending on what is available for the target and the
+expected performance and code size impact.
+
+Arguments:
+""""""""""
+
+The first argument is a pointer to the destination to fill, the second
+is the value with which to fill it, the third argument is an integer
+argument specifying the number of bytes to fill, and the fourth is a boolean
+indicating a volatile access.
+
+The :ref:`align <attr_align>` parameter attribute can be provided
+for the first argument.
+
+If the ``isvolatile`` parameter is ``true``, the
+``llvm.memset_pattern`` call is a :ref:`volatile operation <volatile>`. The
+detailed access behavior is not very cleanly specified and it is unwise to
+depend on it.
----------------
asb wrote:

Ack, I've left it as-is for now.

https://github.com/llvm/llvm-project/pull/97583