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Properly update AA metadata when performing call slot optimization

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Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D7482

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228500 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bjorn Steinbrink
2015-02-07 17:54:36 +00:00
parent f516614e8a
commit 2dd5f23a1d
2 changed files with 32 additions and 0 deletions
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10
lib/Transforms/Scalar/MemCpyOptimizer.cpp
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@ -750,6 +750,16 @@ bool MemCpyOpt::performCallSlotOptzn(Instruction *cpy,
// its dependence information by changing its parameter.
MD->removeInstruction(C);
// Update AA metadata
// FIXME: MD_tbaa_struct and MD_mem_parallel_loop_access should also be
// handled here, but combineMetadata doesn't support them yet
unsigned KnownIDs[] = {
LLVMContext::MD_tbaa,
LLVMContext::MD_alias_scope,
LLVMContext::MD_noalias,
};
combineMetadata(C, cpy, KnownIDs);
// Remove the memcpy.
MD->removeInstruction(cpy);
++NumMemCpyInstr;