[PATCH] D150970: (WIP) [MemCpyOpt]remove memcpy on noalias readonly attributed arguments
Kohei Asano via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri May 19 08:00:19 PDT 2023
khei4 created this revision.
Herald added subscribers: jeroen.dobbelaere, JDevlieghere, hiraditya.
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khei4 requested review of this revision.
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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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