================
@@ -0,0 +1,383 @@
+//===-- InlineAsmPrepare - Prepare inline asm for code generation 
---------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This pass prepares inline assembly for code generation with the fast 
register
+// allocator---e.g., by converting "rm" (register-or-memory) constraints to "m"
+// (memory-only) constraints, simplifying register allocation by forcing
+// operands to memory locations, avoiding the complexity of handling dual
+// register/memory options.
----------------
MaskRay wrote:

Mention that this is not used with other register allocators?

https://github.com/llvm/llvm-project/pull/92040
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