[PATCH] D150970: (WIP) [MemCpyOpt]remove memcpy on noalias readonly attributed arguments

[Kohei Asano via Phabricator via llvm-commits]

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motivated to resolve https://github.com/rust-lang/rust/issues/107436

noalias readonly arguments is safely passed to function directly without memcpy


https://reviews.llvm.org/D150970

Files:
  llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp


Index: llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
+++ llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
@@ -1644,6 +1644,7 @@
         for (unsigned i = 0, e = CB->arg_size(); i != e; ++i)
           if (CB->isByValArgument(i))
             MadeChange |= processByValArgument(*CB, i);
+        /* else if (CB-> ) attributed with noalias readonly*/
       }
 
       // Reprocess the instruction if desired.


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